k 18783 TECHNOLOGY - VIDEO - STEREO - COMPUTERS - SERVICE BUILD YOUR OWN MACINTOSH-COMPATIBL COMPUTER! And save a bundle of money in the process BUILD R-E's E-Z SHORTWAVE RADIO Tune in to a new world of programming WHICH BATTERY IS RIGHT FOR YOU? j How to choose and use the right battery GET THE MOST OUT OF YOUR / DIGITAL SCOP By understand!! how it works i BUILD A N GENERATOR Experiment with high-voltage electronics and the effects of negative ions EERHSBACK PUBLICATKW SZ.95 U.S. $3.75 CAN xxxxxxxx CAR-RT SORT *■'*■' CRD3 75D456HRR51S5MD93 01 94 SEP 31 RB FLUKE AND PHILIPS - THE GLOBAL ALLIANCE IN TEST & MEASUREMENT Kl PHILIPS Great Choice. More professionals in more industries make Fluke their first choice in multimeters. Fluke DMMs. Reliable. Accurate. Powerful. Tough. Versatile. Easy to use and simple to operate. Backed by the longest, most comprehensive warranty in the business. Made in the U.S.A. In short, Fluke makes meters you can bet your reputation on. More choice. No matter what the job, there's a Fluke to handle it. There's the new 80 Series-lhe most powerful, most complete test and measurement system available in a handheld package. The popular 70 Series— simply put, the most requested DMM in the world, with nearly 2 million units in service since 1984. And the Fluke 21 and 23-70 Series simplicity in high-visibility yellow. The Fluke 25 and 27 — the most rugged meters ever built, totally sealed against water, dust and other contaminants. And the precise 8060 Series-with the versatility of a lest lab, the accuracy of a bench instrument, and the convenience of a handheld. Smart choice. Compare Fluke DMMs with any other handheld. No one else gives you as much meter for your money. And no other meter costs less to own. CIRCLE 121 ON FREE INFORMATION CARD Your choice. For the name of your nearest Fluke distributor, call toll-free 1-800-44-FLUKE, ext. 33. And make a great choice. John Fluke Mlg. Co.. Inc. P.O. Bo* C9C90 MIS 2SOC trarell, WA 98206. J.S.: (206) 356-5406. Canada: (416) 896-7600 Wier Counlriss: (206) 356-5500. « 1989 John FWib Mlg. Co, Inc. All Dghls resened. M No. 04S1F70 FROM THE WORLD LEADER IN DIGITAL MULTIMETERS January 1991 f/m #„„„.. Vol. 62 No. 1 31 MAC COMPATIBLE Use an Apple motherboard to build a tow-cost Macintosh clone. Charles Colby 41 NEGATIVE ION GENERATOR Experiment with high-voltage electronics and the effects of negative ions. Anthony J. Caristi 56 R-E's E-Z SHORTWAVE RADIO Build a shortwave receiver that you can modify to pick up any frequency that you're interested in! Rodney A. Kreuter, WA3ENK Eim PAGE 41 45 BATTERY TECHNOLOGY Learn the answers to commonly asked battery questions. Mark Dewey 50 PUTTING A NEW SCOPE TO WORK A look at key operating and measurement concepts of today's digital scopes. Robert W. Ramirez mmm 1990 ANNUAL INDEX F£cmvtfrs Volume 61 and CMiKfnaatnT Voiume 7 ■::'■/:. 84 COMPUTER CONNECTIONS Software reviews, and more. Jeff Holtztnan ■ 'H^H.U- 8 VIDEO NEWS What's new in this fast- changing field. David Lachenbruch 12 EQUIPMENT REPORTS Global Specialties' Prototab. 61 1990 ANNUAL INDEX Find the story you want with this handy listing of articles and departments. 68 HARDWARE HACKER Cold-fusion update, and more. Don Lancaster 80 AUDIO UPDATE The Boston sound. Larry Klein 98 Advertising and Sales Offices 98 Advertising Index 49 Free Information Card 9 Letters 87 Market Center 28 New Lit 18 New Products 4 What's News 5 CD o z o DC 5 W < If you're looking for a computer that ranks high on customer loyalty, the Mac's the one. Satisfied Mac users are quick to defend their com- puters against the pro-IBM faction. Unfortunately, the high cost of own- ing a Macintosh has kept many po- tential users in the IBM ranks. If that describes you, check out our cover story to find out how you can invest about $400 and the cost of any 128K through SE-30 Mac logic board — and several hours work, of course — to build yourown Macintosh comput- er. The finished product includes the case, power supply, 800K floppy- disk drive, a power/video board, and the video driver module. And with our version, it's easier to install or remove a board or a drive. Turn to page 31 for more details. THE FEBRUARY ISSUE GOES ON SALE JANUARY 3. BUILD A UNIVERSAL COUNTER/TIMER BOARD FOR YOUR PC It offers a 10-Hz to 2.4-GHz measurement range, runs under Windows, and can control a communications receiver. BUILD AN AUDIO SWEEP/MARKER GENERATOR Use it with a scope to display the frequency response of audio systems. STANDARDS What's a volt? An ohm? Standards keep our measurements meaningful, SEMICONDUCTOR MEMORIES A look at different technologies, including the pluses and minuses of CMOS, TTL, and EEPROM's. As a service to readers, RADIO-ELECTRON ICS publishes available plans or information relating to newsworthy products, techniques and scientific and technological developments. Because of possible variances in the quality and condition of material* and workmanship used by readers, RADIO- ELECTRONICS disclaims any responsibility for the safe and proper functioning of reader-built projects based upon or from plans or information published in this magaiine. Since some of the equipment and circuitry described in RADIO-ELECTRONICS may relate to or be covered by U.S. patents, RADIO-ELECTRONICS disclaims any liability for the infringement of such patents by the making, using, or selling of any such equipment or circuitry, and suggests that anyone interested in such projects consult a patent attorney. RADIO-ELECTRONICS, {ISSN 0033-7662) January 1991 . Published monthly by Gems back Publications. Inc.. 5ufJ-d Bi-County Boulevard, Farrriingdal*. NY 11735 Second-Class Postage paid at Farming dele, NY and additional mailing offices. Second-Class mail registration No. 9242 authorized at Toronto, Canada. One-year subscription rate U.S.A. and possessions $17.97. Canada $23.97, all other countries 526.97. All subscription orders payable in U.S.A. funds only, via international postal money order or check drawn on a U.S.A. bank. Single copies $2.95.. 1990 by Gemsback Publications, Inc. All rights reserved. Printed in U.S.A. POSTMASTER: Please send address changes to RAO tO- ELECTRONICS. Subscription Dept.. Box SS1 15. Boulder, CO B0321-5115, A stamped self -addressed envelope must accompany all submitted manuscripts and/or artwork or photographs if their return is desired should they be rejected. We disclaim any responsibility for the toss or damage of manuscripts and/or artwork or photographs while in our possession or otherwise. Hu go Ge m sba ck ( 1 884} 967! founder Larry Stockier, EHF. CET. editor-in-chief ond publisher EDITORIAL DEPARTMENT Brian C. Fen ton, editor Marc Spiwak. associate editor Daniel Goodman, technical editor Kim Dunleavy, assistant technical editor Tori Scaduto, assistant editor Jeffrey K, Holtzman computer editor Robert Grossblatt, circuits editor Larry Klein, audio editor David Lachenbruch contributing editor Don Lancaster contributing editor Richard D. Fitch contributing editor Kathy Terenzi, editorial assistant ART DEPARTMENT Andre Duzant, art director Injae Lee, illustrator Russell C, Truelson. illustrator PRODUCTION DEPARTMENT Ruby M, Yee, production director Janice Box, editorial production Karen S. Tucker advertising production Marcella Amoroso produ cti on assi stant CIRCULATION DEPARTMENT Jacqueline P- Cheeseboro circulation director Wendy Alanko circulation analyst Theresa Lombardo circulation assistant Michele Torrillo, reprint bookstore Typography by Mates Graphics Cover photo by Diversified Photo Services Radio-Electronics is indexed in Applied Science & Technology Index and Headers Guide to Periodical Liter- ature. Microfilm & Microfiche editions are available. Contact circulation depart- ment for details. Advertising Sales Offices listed on page 98. Radio-Electronics Executive and Administrative Offices 1-516-293-300.0. Subscriber Customer Service; 1-800-288-0652. Order Entry for New Subscribers: 1 800-999 7139. M*\ The MF\ Audit \^J Bureau of Circulation $59.95 INCLUDES 1 9 G09D REASONS WHY THIS MULTIMETER IS FOR Y9U. 1 AUTO RANGING 2 FULL OVERLOAD PROTECTION 3 DIODE CHECK 4 CONTINUITY CHECK WITH ALARM 5 'HANDS-FREE 1 MEASUREMENT 6 CURRENT UP T0 10 AMPS 7 MEMORY MODE FOR DEVIATION MEASUREMENT 8 0.5% ACCURACY 9 COMPACT RUGGED CONSTRUCTION 10 3 1/2 DIGIT LCD DISPLAY Global's Model 735 Digital Multimeter provides a superb combination of high performance, low cost and extremely easy operation. Featuring a full compliment of Autoranging measurement functions including DC Voltage, AC Voltage, DC Current, AC Current, Resistance, Diode Check, and Continuity check. fe Call toll-free for details 1-800-572-1028 Advanced features such as Memory Mode and Data Hold are provided giving the Model 735 performance normally associated with meters costing twice the price. Don't let the © GLOBAL SPECIALTIES CIRCLE 182 ON FREE INFORMATION CARD low price and compact size fool you, the Model 735 packs performance and value found in all Global instruments. Clearly, the Model 735 is the best value available in it's price category, and is suitable for school, hobbyist and professional users Acq q C | Order yours today I! OUUeUU' A024 1 Global Specialties ^ 70 Fulton Terrace. New Haven, CT 0651 2 jj Telephone: (203) 624-3103. Slnterplex Electronics, 1990. -< CO to CO o z o i ijj LU g D < Building robots with "survival instincts." By studying the instincts and re- flexes of living creatures, researchers at the Georgia Institute of Technology have demonstrated feasibility for a robot capable of making "instinctive" survival decisions such as seeking shade to cool down interna! systems or changing travel plans to save fuel. A model of the hormonal systems that control "fight-or-flight" decisions in mammals could provide the blue- print for a generation of robots that could possibly navigate hazardous waste sites, coal mines, or even dis- tant planets — without remote-control assistance. The goal of Dr. Ronald Arkin is a robot that, when confronted by un- mapped terrain, is capable of reacting instinctively, without the need for re- programming or remote direction. By studying the endocrine system of mammals and other biological mod- els, Dr. Arkin hopes to discover pre- cisely what cognitive events or visual PARTS D1IEI3 DR. RONALD ARKIN ADJUSTS the vision system that "George," Georgia Tech's specialty modified materials-handling robot, uses to navigate to its objective. signals trigger and modulate par- ticular movements in animals. Ulti- mately, he hopes to outfit Georgia Tech's mobile materials-handling robot, George, with sensors capable of transmitting information about a variety of internal scenarios or "sche- ma," such as dwindling fuel reserves or dangerous temperature levels. So- lution options could then be pro- grammed into "receptor schema" that would be linked to a subsystem that makes routing decisions. ORDER STATUS: W HANUF CONTROL NO.: RACK ORDER B.TY: e CANCELLED QTY: COttlEHT: THIS PART GENED TOR TEST ONLY 97/95/98 — P HUH part mn 99999999999999999959 liuiiiiiiiiiiiiiiii miiiiiiiiiiiimii ZZ222ZZZ222ZZZZZ2Z22 2ZZ2ZZZZ2ZZZ222Z22Z2 22ZZ22ZZZ2ZZ22ZZ2ZZ2 55555555555555555555 55S55555555S55555S55 CREATED: TRANSNITTED: CONFIRMED: RECEIVED: RACK ORDER DUE; ORDER FILL SHIP (JTY SUPPL EflERG CODE METHOD 2 PAHAS 1 IBM 1 IBM 1 I1ICTK Z HICTK 1 HICTK 1 FANAS 1 PANflS 'AFT ORDER LIST SORT] ORDER MUflBER PART NUMBER SUPPLIER F1=HELP F2=SEftRCH F7=S0RT LIST EHTEB=T0 ADJUST ORDER ESC=T0 RETURH TO Main HEHU A PARTS ORDERING SCREEN FROM IBM'S Electronic Service Management System/2, which provides independent service centers with direct, on-line communications with manufacturers. How many transistors? The 1968 Transistor Rule, deemed "obsolete but innocuous" by Com- missioner Andrew J. Strenio Jr., has been repealed. The Federal Trade Commission ruling prohibited man- ufacturers from stating that a radio or walkie-talkie contained a specific number of transistors when some of those transistors did not actually de- tect, amplify, or receive radio signals. The "truth-in-advertising" rule was drafted to put an end to the deceptive promotional use of transistor count. So few transistors are used in mod- ern radios and transceivers that the rule, in effect, already had been ren- dered meaningless. Strenio ex- pressed hope that sometime in the future the FTC would have sufficient resources to undertake systematic "pruning projects" to remove other outdated and obsolete regulations under Federal law. On-line service-center management, Introduced at last summer's Na- tional Professional Electronics Con- vention in Las Vegas, NV, IBM's Electronic Service Management Sys- tem/2 CESMS/2) is a comprehen- sive, on-line solution that allows small- and medium-sized indepen- dent consumer-electronics servicers to electronically process warranty claims and order spare parts. With ESMS/2. service centers can com- municate directly with the manufac- turers for faster reimbursements on warranty claims and quicker turn- arounds on parts orders. On-line pric- ing updates and service and technical bulletins from the manufacturers will also be available. The software runs on the IBM PS/2 or IBM PC's, and a modem is required to access the IBM Informa- tion Network. ESMS/2 is available as software only, or in a package with a PS/2. Besides the communications capabilities, ESMS/2 provides other service-management functions, in- cluding work-order processing, parts inventory, and technician evaluations. It can also be used to generate re- ceipts and invoices, custom and form letters, mailing lists, and reports. A LAN version is available for multiple users. B-E Discover Your Career Potential In The Fast Growing Field Of High-Tech CIE Gives You The Training You Need to Succeed. At Your Own Pace...& In Your Own Home! If you're anxious to get ahead ...and build a real career... you owe it to yourself to find out about the Cleveland Institute of Electronics! CIE can help you discover your career potential in the fast growing field of high-tech electronics. A career that will challenge and excite you every day.. .reward you with a powerful feeling of personal accomplishment... and deliver a level of financial security you may have only dreamed of before! As the leading school in home-study electronics, CIE has helped over 150,000 students in the U.S.A. and over 70 foreign countries get started in this exciting field. To find out how CIE could be helping you... read on... then send for a CIE catalog TODAY! A Growing Need For Trained Professionals! The career opportunities shown here are only a few of the challenging, high- paying careers you could enjoy as an electronics technician. You could be the "brains" behind the scenes of an exciting TV broadcast.,, trouble-shoot life-saving medical equip- ment... design exotic new aeronautics systems... CI E's job-oriented programs offer you the quickest possible path to the career of your dreams! And CIE also features military and union re-training, to build on what you already know. Dozens Of Fascinating Careers To Choose From! Even if you aren't sure which career is best for you, CIE can get you started with core lessons applicable to alt areas of electronics. As you advance, CIE makes job opportunities available to you through the bimonthly school paper, The Electron. W*T*r .-****./ '^w^ Consumer Electronics Military Electronics Personal Training From A Renowned Faculty. Unlike the impersonal approach of large class- room study, CIE offers you one-on-one instructional help 6 days a week, toll-free. Each CIE lesson is authored by an independent specialist, backed by CIE instructors who work directly with you to answer your questions and provide technical assis- „„„ tance when you need it. Practical Training... At Your Own Pace. Through CIE, you can train for your new career while you keep your pres- ent job. Each course allows a gener- ous completion time, and there are no limitations on how fast you can study. Should you already have some electronics experience, CIE offers several courses which start at the intermediate level. "State-Of-The-Art" Facilities & Equipment. In 1969, CIE pioneered the first elec- tronics laboratory course, and in 1984, the first Microprocessor Laboratory. Today, no other home study school can match CIEs state-of-the-art equipment. And all your laboratory equipment is included in your tuition cost. There is no extra charge — it's yours to use while you study at home and on the job after you complete your course! Earn Your Degree To Become A Professional In Electronics! Every CIE course you take earns you credit towards the completion of your Associate in Applied Science Degree, so you can work towards your degree in stages. And CIE is the only school that awards you for fast study, which can save you thousands of dollars in obtaining the same electronics education found in four-year Bachelor's Degree programs! Write for details today! Send For Your Catalog Today! CIE World Headquarters ® Cleveland Institute of Electronics, Inc. 1776 East 17th St., Cleveland, Ohio 44114 □ YES! Please send me your independent study catalog (For your convenience, CIE will have a representative contact you— (here is no obligation.) Aptt Area CodeJ Phone No. Check box tor G.I. Bill bulletin on educational benefits; n Veteran □ Active Duly Mail This Coupon Today! AE01 c > zo _l 3 E33DCESE What's new in the fast-changing video industry. mmmmmm » Photo CD. An electronic photo album combining the best features of film and video photography has been developed by Eastman Kodak and Philips and is promised for worldwide introduction in mid-1992. Photo CD is a system for storing home still color snapshots digitally on a standard five- inch compact disc for playback on any television set or for printing with full-film definition at any time. Under Kodak's plan, amateur photogra- phers will take their negatives to their neighborhood processor, who will transfer them to a disc. One disc will hold up to 100 exposures. A basic disc with 24 pictures will cost less than $20, according to Kodak, and that disc may be returned to add more pictures — up to 100. Storage of the pictures on the disc is basically a write-once CD-ROM process. Each disc will be packaged in a standard "jewelbox" container with an "index print" on the front cover — a page di- vided into 24 miniature color pictures showing the contents of the disc. The player, which can also play au- dio CD's, is expected to sell for less than $500. Unlike videotapes and laser videodiscs, the Photo CD is standards independent. Because the signals on the disc are digital, it can be played on any TV anywhere in the world. The system is claimed to have four times the resolution of the best high-definition TV proposed to date, or about 16 times the detail of today's TV systems. Philips says it will pro- duce several models of Photo CD players, and Kodak says it hopes to license other manufacturers. • Closed Captions for All. A bill passed by both the House and the Senate and awaiting President Bush's signature at our press time will add a new feature to most television sets made or imported after July 1, 1993. Although decoders have been available for many years to display the closed captions available on an in- creasing number of programs, all fu- ture TV sets with screens 13 inches and larger will have them built in. The captions are on line 21 of the vertical blanking interval (VBI) between pic- tures, and are designed as an aid to the hearing impaired. They're also being hailed as a way to help foreign- speaking viewers learn English. The addition of the new feature is ex- pected to add a few dollars to the cost of the set. The first manufacturer to introduce a wide range of closed- captioned sets is expected to be Zenith, which had planned to add the feature before the legislation was passed. Zenith, the only American manufacturer offering sets with built- in teletext, is expected to add the caption sets in 1991. • Program Chips. Manufacturers of home video equipment must sit up many a night trying to figure out new products and features. The latest is a camcorder with ready-to-use pro- grams. Canon's newest high-band 8mm CHiSJ camcorder is designed to accommodate both audio and video "program chips," which fit into slots on the side of the camcorder body The graphic chips contain titles and simple automation — "Happy Birth- day," "The End," and so forth. One chip, for example, includes an ani- mated helicopter flying across the screen, pulling a banner on which the user may insert the title of his or her epic. The music chips contain elec- tronically-generated ditties, which can be used as background accom- paniment in three volume settings. • First HDTV Sets. Thomson Consumer Electronics, the French firm that markets the RCA and GE brands in the United States, is sched- uled to introduce what may well be the world's first mass-produced wide- screen HDTV sets in Europe this month (January). The new sets will be ready for almost any TV system ex- pected to be available in Europe. The sets have a tube measuhng 36 inches in overall diagonal in the 16:9 proportion, closer to Cinemascope dimensions than to the 4:3 of stan- dard TV. They will be equipped to display standard European PAL and SECAM broadcast transmissions in two ways — either in the standard pro- portions taking up only part of the screen, or "blown up" to fill the full screen (but sacrificing part of the top and bottom of the picture). They are equipped with built-in satellite re- ceivers and can also display both standard and enhanced-definition (MAC) pictures to be transmitted from some European satellites, as well as "Wide MAC," a widescreen version of the enhanced-definition pictures. And when the new HD- MAC widescreen transmissions with 1,250 scanning lines are available, they will display them in full definition. The sets are equipped with two tuners, and have a "picture-outside- picture" (POP) feature that displays three smaller pictures vertically to the right of a standard 4:3 picture on the wide tube. Those pictures can be a quick table of contents of channels available, or a sequence of snapshots from any program. In addition, the set is designed to enhance any standard European transmission by doubling the number of lines to 1.250, resulting in an IDTV (improved-definition) pic- ture. The price for all this? The equiv- alent of about $7,000 U.S., installed, including a 13-inch dish antenna for the upcoming high-powered Euro- pean satellite transmissions. • Widescreen VCR. A suitable companion to the Thomson wide- screen TV set will be a widescreen VCR— and it's in sight. Standards have been developed for a compati- ble dual-dimension VHS video re- corder that will record and play both standard and widescreen pictures. When recording widescreen pic- tures, the system compresses the data horizontally, expanding it on playback. Playback is automatic, with the recorder sensing the dimension of the picture on the tape and adjust- ing itself. The widescreen VCR sys- tem, developed by JVC and Thomson, is expected to be an- nounced this year by JVC. B-E LETTER5 Write to Letters, Radio-Electronics, 500-B Bi-County Blvd., Farmingdale, NY 11735 MYSTERY MICROWAVE TUBE I read with great interest about ear- ly attempts at microwave generation in Joseph Carr's article "Introduction to Microwave Electronics" (Radio- Electronics, June 1990). I acquired a strange tube, pictured here, that appears to be an old wartime military microwave tube. (Note the markings on the unit, and the fancy oak pack- ing.) It doesn't seem to have enough external connections to be a klystron, and it has no magnets like a magne- tron would. Is it from some early, se- cret radar unit, or from something much less glamorous, like a diather- my machine? TOM SHERWOOD Xenia, OH The device pictured is a Type-2J22 magnetron, and was used in pulsed oscillators for radar units operating in the 10-crn microwave hand (3.267 to 3.333 GHz). It was discussed at length in Volume 6 of the M.I.T. Radia- tion Laboratory Series on microwave and radar technology. Illustrations in the book depict the tube with the magnet and without it, as in your pic- ture, and a schematic view. The 2J22 pictured here is complete except for the magnet, which indicates to me that it was a replacement part (the magnet remained with the equip- ment). — Joe Carr CAD-PROGRAM KUDOS Several months ago, Radio- Electronics had a short review of a computer-aided drafting program for electronic schematics, called Auto- skem, from BSOFT Software. After reading the article, I bought a copy of the program and was pleasantly sur- prised to find that my fifty dollars bought a full-featured CAD program fine-tuned for optimum use in making schematic designs. It comes with an extensive symbols library and allows you to edit symbols, create new ones, and create entire new symbol libraries. In addition, whole sche- matics or a section (text and all) can be saved as an object, to be called into other schematics as desired. The program is Microsoft-mouse com- patible, and can save schematics to Hewlett-Packard Graphics Language (HPGL) format plotter files. It even includes a utility that allows you to print the HPGL files on a 24-pin dot- matrix printer. I highly recommend Autoskem to any IBM -PC-compati- ble user who needs an inexpensive, powerful schematics CAD program. BRUCE O. YOUNG Minot, ND TESTING TAPE SPEED I was very interested in Geoff Sale's letter concerning tape-deck speed calibration (.Letters, Radio- Electronics, June 1990). My meth- od is similar, and might interest other readers. Not having a frequency meter, I built the frequency-to-voltage con- verter depicted in Fig. 1. Using a func- tion generator set to about 1 kHz, I recorded a good-quality cassette on a very good cassette deck, monitor- ing the input frequency on the con- verter. At t kHz I got a reading of 6 volts. I then played the cassette back through the same machine, and got exactly 6 volts back. If it had not given the correct frequency l would have adjusted the motor speed according- ly — a high reading indicates too fast a tape speed, a low reading means too slow. The motor speed can be ad- justed using either a built-in trimming potentiometer or an external one mounted on the PC board. Record, play back, and adjust the motor speed until the playback volt- age is exactly that of the function generator. Then record the whole tape; that will be your calibration tape. Made in the U.S.A. Building the best DMM for the money is no accident The new RMS225 was carefully designed to give you what you wanted at a price you could afibid. Visit your local distributor today and you'll agree the choice is obvious. Fluke Model 77 Hcckman Industrial RMS2Z5 3-V2 Digils 4 Digits 3,200 Counts 19,000 Counts 0.3% Accuracy O.E&Vo Accuracy Touch Hold* Probe Hold™ 31 Segment Analog Bar Graph 41 Segment Analog Bar Graph 2,000 Hour Battery Life 1,00a Hour Battery Ufe 10A Range ifusm. IDA flange tomatt, Protectee Holster Protective Holster 3 Vr. Warranty 3 Yr. Warranty - True RMS - Auto Min Mai™ - Relative Mode — Sell-Resetting Fuse 140mA mpm $159* hn * Touch Hold is a registered trademark of the John Fluke Mfg. Co., Inc. "1990 Fluke and Philips Catalog Beckman Industrial'" An Affiliate ol Emerson Electric Co Lnslrumemation Products Division 3683 Hu91n Road, San Diego. CA 92123-1898 (619) 495S200 ■ FAX (619) 2684172 ■ TLX 249031 Outside California 1-80O-854270S Wilhin California 1-30O-227-97S1 © 1990 Bedjnan Lnduftrial Corporatwn Spwificatfens jud)ki eo thanjj- wiihouL noEkc Fluke is a repstercd Iradcnwk of)oh[t Fluke Mf& Gq. Iik jtNigoui am CIRCLE 98 ON FREE INFORMATION CARD > Z C > 3 ID Put Professional Knowledge and a COLLEGE DEGREE in your Technical Career through HOME STUDY o z s H O Add prestige and earning power to your technical career by earning your Associate or Bachelor degree through directed home study. Grantham College of Engineering awards accredited degrees in electronics and computers. An important part of being pre- pared to move up is holding the right college degree, and the abso- lutely necessary part is knowing your field. Grantham can help you both ways — to learn more and to earn your degree in the process. Grantham offers two degree pro- grams — one with major emphasis in electronics, the other with major emphasis in computers. Associate and bachelor degrees are awarded in each program, and both pro- grams are available completely by correspondence. No commuting to class. Study at your own pace, while continuing on your present job. Learn from easy-to-understand lessons, with help from your Grantham instruc- tors when you need it. Write for our free catalog (see address below), or phone us at toll-free 1-800-955-2527 (for catalog requests only) and ask for our "degree catalog." * Accredited by the Accrediting Commission of the National Home Study Council ■f T-/ZL V GRANTHAM College of Engineering Grantham College Road Slidell, LA 70460 IC3 T CA3JtO 3 FIG. 1— CASSETTE MOTOR-SPEED CALIBRATOR. Set potentiometer R2 so that the potential at pin 2 of IC1 (the CA3140) Is equal to that on pin 3. Careful adjustment will result in a sensitivity of 100 mV. Feed a frequency of ± 1000 Hz to the input ("IN") and use a DVM to measure the reading at the output ("OUT"). Set R10 to give a convenient reading. The frequency-to-voltage convert- er can easily drive an analog instru- ment, which clearly indicates small variations in speed. The needle of the meter should be rock steady for a good drive mechanism. I test a number of cassettes in the course of my work, and in the several years that I've used this frequency-to- voltage converter, I'd say that it is definitely better than a frequency counter. By the way. I've been reading Ra- dio-Electronics since the Radio- Craft days of the 1930s, and I think it's the best. Keep it up! JOHNNY BRUYNS Port Shepstone, South Africa CLEANING VCR HEADS After reading Larry Klein's re- sponse to Jo Anne Abbot's letter in the October 1990 issue of Radio- Electronics, I felt compelled to add to her statement whatever weight I could. As a Regional Support Repre- sentative for IBM for 30 years, 1 had many occasions to experience low- quality magnetic media (usually cheap diskettes). As advised by engi- neering and proved by countless field incidents, passing a high-quality me- dia over the heads (i.e., formatting a couple of times, write/ record for a few minutes) will clean them. Ms. Abbot is correct in that high- quality tape or diskette manufac- turers do put lubricant in the magnet- ic formulation that cheap media do not have. But it is the slightly abrasive quality of a new tape or diskette that cleans the head(s), and not the chem- icals. After a few passes, the media surface will polish down and lose most of its cleaning ability. The lubri- cants in the formulation are there to reduce head wear, nothing else. Cheap media will plug the head gap as a result of low-quality binder in the oxide mix. With a cheap binder, the oxide particles easily break away from the media surface and get down into the gap. Remember that, as small as the gap is, the particles are much smaller yet, and easily fill the gap and coat the head. While Larry Klein might not have heard of Ms. Abbot's cleaning method, I can assure him that it does work — with high-quality, new tape or diskette media— and eliminates the need for treacherous cleaner tapes or diskettes. JAMES W. BIGGER San Diego, CA DESOLDERING IC's Several letters relating to desolder- ing IC's have recently appeared here, and I'd like to present my technique. Use a "solder sucker" ordesoldering braid. If the solder remaining has a frosty, lumpy appearance, put a little rosin flux on it and try again. After that, each contact will be over against one side of the circuit-board hole and bonded to the hole with a thin film of solder. Next, take a small screwdriver and push the stuck contact from one side of the hole to the other. The movement is small and hard to see, but you should feel and hear a slight "pop" when the film breaks. Do this to all contacts and pull the IC off; it works. PAUL S. McKIBBEN Lake Elizabeth, CA R-E- 10 ELENCO & HITACHI PRODUCTS AT DISCOUNT PRICES & RSOs (Real-Time & Storage Oscilloscopes) From HITACHI The RSO - Its the new solution View, Acquire, Test, Transfer and Document Your Waveform Data % *h Compact Series Scopes 4-Chonnei. lOOMS/s Model Introductory Price 100MS/s(2$MS/S on 4 channels simultaneously), 100MHz, 4kwx I eh.. 2kw x 2ch„ 1 kw x 4eh. VC-6145 i 4,695.00 Compact, Full Feature Models VC-6045 5 3,049,00 VC-6025 $ 2,295.00 40MS/S, 100MHz, 4Scw K led., 2kw x 2ch. 20MS/S, 50MHz, 2kw x 2ch. Low Cost/High Value Models 20MS/5, 50MHz, 2kw i 2eh. VC-6024 $ 2,049.00 20MS/S, 20MHz. 2kwx 2ch. VC-6023 $ 1,749.00 RSOs from Hitachi feature such functions as roll mods, averaging, save memory, smoothing, interpolation, prelrkjge ring, cursor measurements, plotter interface, and RS-232C interface. With the comfort of analog and the power of digital. V21Z Hitachi Portable Scopes $435 DC to SuMHz, 2-Channel. DC offset dc io 20MH7 'unction. Alternate magnifier function Dual Channel V-525 CRT Readout, Cursor Meas. $1 .025 V-523 Delayed Sweep $995 J79S V-S22 Basic Model $895 Delayed Sweep Lightweight (13lbs) ZfflV Sens 3 Yr Warranty Modal V- 1065 Shown This series provides many new functions such as CRT Readout, Cursor measurements (V-1 085/1 065/665), Frequency Ctr (V-1 085), Sweeptime Auto ranging and Trigger Lock using a 6-inch CRT. You don't feel the compactness in terms of performance and operation. V-422 40MHz Dual Trace V-660 BOMHzOualTrace V-665 60MHz Dual Trace w/Cursor V-1060 100MHz Dual Trace V-1065 100MHz Dual Trace w/Cursor V-1085 1 00MHz Quad Trace w/Cursor V-1 100A 1 00MHz Quad Trace w/Cursor V-1 150 150MHz Quad Trace w/Cursor $1,195 $1,345 $1,425 $1,695 $2,045 $2,295 $2,775 20MHz Elenco Oscilloscope $375 MO- 1251 • Dual Trace • Component Tester • 6- CRT • X-Y Operation « TV Sync « 2 p-1 Probes FREEDMM with purchase of ANY SCOPE SCOPE PROBES P-l 65MHz, lx, lOx S19.95 P-2 1COMHZ, Ix, lOx $23.95 Elenco 35MHz Dual Trace * ,,«- Good to 5DMHz 5495 MO- 1252 ■ High luminance 6" CRT • 1 rnV Sensitivity • 6KV Acceleration Voltage • 10ns Rise Time • X-Y Operation - Z Axis • Delayed Triggering Sweep Wf • Includes 2 P-1 Probes All scopes include probes, schematics, operators manual, and 3 year (2 yrs for Elenoo scopes) world wide warranty on parts &, labor. Many accessories available for all Hitachi scopes. Call or write for complete specifications on these and many other fine oscilloscopes. WE NOW CARRY COMPLETE LINE OF FLUKE MULTIMETERS Models 21F 83 85 87 8050A 8060A 8062A + More CALL FOR SPECIAL PRICING 23F 25F 27F 73 75 77F B B True RMS 4 1/2 Dig it Multimeter M-70DO $135 .05% DC Accuracy .1% Resistance with FFeq. Counter and deluxe case Function Generator Blox #3600 $28.95 t&[# Provides sine, triangle, square wave Irom 1Hz to tMHi AM or FM capability nnmi 1 Function Multimeter CM -365 $65 AC * DC Voltage & Amps Resistance Ic 2QO0MI1 Diode, Logic, S Trans tesl Capacitance to 2 < 17 NEW PR0DUCT5 Use the Free Information Card for more details on these products. UNIVERSAL FUNCTION GENERATOR. Providing the higher frequencies and greater versatility required to evaluate high-speed electronic systems, B&K- Precision's model 3040 13- MHz universal function generator with frequency counter is designed for use in R&D, production testing, service and repairs, and education. It offers a 0,1 -Hz to 13-MHz main generator range with a digital fre- quency display and pro- vides sine, square, triangle. ramp, and pulse waves; TTL outputs; and AM and FM modulated signals. The second generator range, from 0.1 Hz to 10 kHz, can be used as a modulation source, sweep source, gating source, or indepen- dently. The second gener- ator provides sine, square, CIRCLE 30 ON FREE INFORMATION CARD triangle, ramp, and pulse signals. An internal/exter- nal 6 digit frequency coun- ter measures signals to 30 MHz, The model 3040 has internal/external AM and FM modulation and sweep generator capabilities. It provides triggered and gated, single or multiple operations and two simul- taneous outputs. The model 3040 13-MHz function generator costs $1,195.00— B&KPreci sion, 6470 West Cortland Street, Chicago, IL 60635; Tel: 312-889-1448. POCKET (NFO PAC. The battery-powered Pocket Info Pac, which measures 1% x 4 x 8% inches and weighs just over one pound, lets users access images and scroll through electronic pages, much like reading a book, by simply pressing a series of three or four buttons on a touch pad, or through menu op- tions. Using the innovative Private Eye ultra-miniature CIRCLE 11 ON FREE INFORMATION CARD virtual display from Reflection Technology (Radio-Electronics, February, 1990) as its dis- play, Colby Systems' Pocket Info Pac gives users instant access to any one of thousands of images. The high-capacity, hand- held information-storage and -retrieval system lets users download, access, and control text and graph- ics using a built-in touch pad. The Private Eye, al- though it weighs only 2.26 ounces and fits in the palm of a hand, allows users to view high-resolution im- ages as a full 12-inch, 720 x 280-pixel image. The data is downloaded via a serial port from a Macin- tosh or MS-DOS-compati- ble computer and can be updated or changed ac- cording to the user's needs. The device can be configured with 1MB of standard memory or up to 16MB of optional memory, and is available with EPROM. STATIC RAM, or PSEUDO-STATIC RAM in- ternal add-on memory. Also available are the plug- in Colby Magic Memory Module and COLBYCARD memory units. The Pocket Info Pac costs between $899.00 and $2999.00, depending on the type of memory. — Colby Systems Corpo- ration, 2991 Alexis Drive, Palo Alto, CA 94304; Tel: 415-941-9090. AUDIO POWER TRAN- SISTORS. Three lines of audio power transistors from Toshiba, targeted at the U.S. power-amplifier market, are engineered with good noise linearity for low THD and low inter- modulated distortion. Three audio product types— IGBT, MOSFET, and bipolar — are repre- sented to provide perfor- mance and price options; all three meet class A and class AB power-amplifier standards. The IGBT power tran- sistors (pictured) include the 250-volt, 20-amp GT20DWI and the com- plementary GT20D201 that feature high forward transfer admittance, low saturation voltage, high in- put impedance, and an en- hancement mode. The complementary P-channel/ N-channel MOSFET pairs CIRCLE 12 ON FREE INFORMATION CARD feature high forward trans- fer admittance, low ON im- pedance, and high-fre- quency operation. They provide optimal low switch- ing distortion for the high- est frequency response in high-end power amplifiers. The MOSFET pairs include the 1 8-volt, 1 0-amp 2SK1529 and 2SJ200- the 200-volt, 12-amp 2SKI530 and 2SJ20I. The bipolar audio power transistors are high-voltage, high-current complementary NPN/PNP devices optimized for low- power dissipation and 18 lower cost per watt of out- put power in audio power- amplifier applications. The bipolar 2SA1553/2SC4029 pairs are fabricated in TO-3PCL) packages, as are the IGBT transistors. The MOS- FET's are packaged in TO-3PCN) packages. In quantities of 500, the IGBT power transistors range in price from $5.30 to $5.70 each, the MOSFET's range from $3.50 to $4.00 each, and the bipolar transistors From $1.70 to $2.10. — Toshiba. America Elec- tronic Components Inc., 9775 Toledo Way, Ir- vine, CA 92718. POCKET PERSONAL DMM. About the size of a slim pocket calculator C2x4x 3 / 8 inches), Techni- Tool's Personal DMM Meter (#393TE060) offers easy one-hand operation. The compact unit features CIRCLE 13 ON FREE INFORMATION CARD a high-speed auto-ranging and sample rate for bar- graph display and an oper- ating range from 0°C to 40°C, with maximum 80% RH. An automatic power- off function increases bat- tery life to 250 hours. The DMM comes in a protec- tive folding case, and weighs only 100 grams in- cluding the meter case and batteries. The Personal DMM Meter has a suggested price of $49.95. — Tech- ni-Tool, Inc., 5 Apollo Road, P.O. Box 368, Plymouth Meeting, PA 92462; Tel: 215-825-4990; Fax: 215-828-5623, BENCH/PORTABLE COUNTER/TIMER. For portable as well as bench- top use, Optoelectronics' model UTC 8030 is both a full -featured, 3-GHz bench- top counter and a self-con- tained portable frequency finder that can be outfitted with its own batteries, an- tenna pack, and backlit readout for field work. CIRCLE 14 ON FREE INFORMATION CARD As a counter-timer, the instrument makes direct and prescaled frequency, period, and time-interval measurements and calcu- lates and displays frequen- cy ratios. The UTC 8030 provides 1-mV sensitivity, 1-PPM accuracy, 1-Hz res- olution, and a 1-Hz to 3- GHz range. A display-hold feature makes it easy to record 10-place frequency readings. An external refer- ence jack is provided for more accurate lab refer- ence clocks. The unit of- fers signal-conditioning controls. A variable trigger control eliminates jitter and a 6-dB/octave low-pass fil- ter and a switchable 20-dB attenuator allow the userto filter out noise. As a portable frequency finder, the UTC 8030 has a 10-Hz to 2400-MHz dy- namic operating range, and 1-mV sensitivity up to 500- MHz. It features a 16-seg- ment signal-strength bar Train at Home to be an Electronics Technician! Professional training and equipment can help you qualify for a dynamic, high-paying career in your spare time. As the demand for computers and micro- processors in business and manufacturing continues to grow, so docs the need for qualified technicians. It's not unusual for ex- perienced technicians to earn from S3 5. (XX) to more than $40,000 a year.* Now there's a way you can train for this exciting field without interrupting your job or home life. Chouse From These Programs of Study •Electronics & Microprocessor Technology •Industrial Electronics & Microprocessor Technology •Computer Servicing & Electronics Technology •Specialized Associate Degree In Electronics Technology You Get Professional Equipment For Professional Training Depending on the program you select, you'll perfect your skills using this advanced equip- ment, included in the price of tuition: • IBM -Compatible Personal Computer • Digital Multimeter • Digital Logic Probe • Elcnco Oscilloscope ' S.*j(v^ I S Bun..ji I L.J*w SUtlvtk- Exclusive Extras That Enhance Your Training Peoples College introduces sonic training firsts to make your learning experience more complete: •Accelerated Learning System — a scien- tifically proven study system that lets you learn faster and easier than ever before. •Optional One-Week Seminar — available with our advanced programs. Conducted on our campus near Orlando. Fla. Not required for graduation, but a valuable opportunity to fine tunc your skills wiih personal guidance. •Video Tutor Training Tapes — give you a permanent, visual record of informative lectures and close-up demonstrations. •Experience Labs — professionally designed experiments that give you hands- on "bench" experience. •Industry Certification Training Guide — provided with three of our programs. Gives you first-hand insight into the examination you may take for your professional license. For COLOR CATALOG Mail Coupon or Call TOM. FREE 1-800-765-7247 Pnt^mini isffcrrd imh in Uiiiifti StaUS, Canatlu, Purrrit Rictt tiiid t>i, j jji A/,m c > < 19 CIRCLE 184 ON FREE INFORMATION CARD graph, augmented by an audio annunciator that beeps faster as signal strength increases. The UTC 8030 universal counter/timer costs $579.00. Options include a ±0.1 PPM time base ($125), a Ni-Cd battery pack ($75), and an LCD backlight ($40).— Op- toelectronics, Inc., 5821 NE 14th Avenue, Ft. Lauderdale, FL 33334; Tel: 800-327-5912 or 305-771-2050; Fax: 305-771-2025. UPS-BATTERY TESTER. For testing lead-acid bat- teries — including the main- tenance-free types such as sealed, recombination, and gel cells that are commonly used with standby, uninter- ruptable, and back-up power supplies — Perfor- mance Technological Prod- ucts has introduced the model 1200 universal 12- volt battery tester. The bat- CIRCLE 15 ON FREE INFORMATION CARD teries can be tested when series-connected with each other, and even while they are actively being charged. The device allows the user to log gradual changes in battery con- dition as they occur, provid- ing a useful history for preventative maintenance. By subjecting the battery to an 80-amp electronic load for 10 seconds, the device can indicate whether the battery is "good," "weak," or "bad." Test results are easy to in- terpret; by simply clipping the tester to a battery, the LCD indicators display the status. Pin jacks on the model 1200 accommodate an auxiliary voltmeter, which allows precise mea- surements during testing. The model 1200 battery tester, with 12-inch leads and copper-plated, color- coded steel clips, costs $194.70. — Perfor- mance Technological Products. P.O. Box 947, Roswell. GA 30077. COAX ADAPTER-CON- NECTOR KIT. Containing 24 connectors and six uni- versal interfaces, Test Pro- bes, Inc. s TPI 3000A Kit lets users quickly and easi- ly create any adapter by screwing any combination of two connectors to one of the interfaces. Because no soldering or crimping is re- quired, the connectors can be used repeatedly. In- cluded are two male and CIRCLE 16 ON FREE INFORMATION CARD female connectors of the BNC, N, UHF, and TNC adapters; one male and female of the SMA. mini- UHF, F and RCA adapters; and six universal inter- faces. The male and female connectors have gold- plated contacts, Teflon in- sulation, and machined- brass silver-plated con- nector bodies. Universal adapter cables are avail- able separately, as are spare individual pieces. The kit comes in a soft- leather case that organizes the collection. g z o 17(01 50-100 MHz 130 iej; 1M-174 MHz ISjEI 19(F) 20|G] 11(H) J! (1) MMDQMHr (30 713 174-J16MH; 7 19 10 11 1?.13 50-100 MHi S30 3 for $75 - 10 for $200 - mix or match CALLTOLLFREEFOaC.O.O.ORSENDCHECKTOORDER FASTDEUVERY 30DAYMONEYBACK<3UARANTEE(3FILTERLIMIT) Star Circuits P. O. Box 94917 Las Vegas, NV 89193-4917 1-800-433-6319 Be an FCC LICENSED ELECTRONIC TECHNICIAN! 3 Learn at home in spare time. ' No previous experience needed) No cosLly school. No commuting to class. The Original Home-Study course prepares you for the "FCC Commercial Radio- telephone License."This valuable license is your professional "ticket" to thousands of exciting jobs in Communications, Radio- TV, Microwave, Maritime, Radar, Avionics and more. ..even start your own business! You don't need a college degree to qualify, but you do need an FCC License. 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Now for the first time in CIE's 56 year history you do not have to be enrolled at CtE to receive our introduc- tory Electronic and Electricity Lesson Modules, Available for a limited time to non-students for the shockingly low price of only $99.50. With CIE's patented AUTO-PROGRAMMED method of learning you'll quickly learn and then master the basics of electronics and electricity and then move on to... DC/ AC circuit theories, fundamentals of bi-polar junction transistors (BJT), field effect transistors (FET), wiring, diagram and sche- matic readings, component identification, soldering techniques... and much, much, more. Your commitment to CIE ends with your payment, but CIE's commitment to your success just begins when you receive your Q^ • " 39 lessons, exams, binders and equipment. This special introductory price includes all the benefits and assistance CIE normally extends to its students and graduates. You'll be entitled to unlimited access to CIE's faculty and staff to assist you in your studies via a toll free 800 number six days a week, 24-hour turnaround on grading your submitted exams, CIE Bookstore privileges, a patented learning method, reference library, a student, faculty and alumni electronic bulletin board and a free issue of CIE's school newspaper The Electron. All this knowledge and support will put you on the road to understanding digital electronics, microprocessing principles, computer systems, telecom- munications, and much, much, more. """*-, All This and Much More For ONLY! ■ Free issue of The Electron • Build your personal burglar alarm • Instructors available 6 days a week • 20 lesson books containing 39 theory and hands-on training lessons and exams. • Bookstore Privileges ' Patented Learning Method ' Electronic Bulletin Board • 24-Hour Grading D Yes, send me CIE's 39 Introductory Electronic and Electricity Lessons and Equipment. Name: Address: City: _Apt. #: State: Age:. .Zip: _Phone { .) BOOKSTORE ITTfi Rust I Tlh Sirivi Ui'ii-Liiul. Oltiu till I (21 z c > < CO to 21 The TPI 3000 A coaxial adapter/connector kit costs $150.00.— Test Probes, Inc., 9178 Brown Deer Road, San Di- ego, CA 92121; Tel: 800-368-5719. PORTABLE RESISTIV- ITY METER. For static control, ACL s #475 meter is designed to provide fast. repeatable, comparative measurements of surface resistivity. The easy-to-use instrument has no cables or probes to adjust, and of- fers automatic ranging from 10 4 to 10 14 ohms per square. Accurate to +V2 decade, the meter conve- g z o Hity c > 3 State/Zip to CO Satisfaction Guaranteed — If you are not completely satisfied, return the book(s) lor a complete refund. Orders) subject lo credit approval. Prices subject to change. REM 23 Learn to troubleshoot and service today's computer systems as you build a f ufly AT-compatible micro, complete with 1 meg RAM, and powerful 20 meg hard drive Train the NRI Way— and Earn Good Money Servicing Any Brand of Computer Jobs for computer service technicians will almost double in the next 10 years according to Department of Labor statistics, making computer service one of the top 10 growth fields in the nation. Now you can cash in on this exciting opportunity— either as a full-time industry technician or in a computer service business of your own— once you've mastered elec- tronics and computers the NRI way. NRI's practical combi- nation of ' 'reason-why" theory and hands-on building skills starts you with the fundamentals of electronics, then guides you through more sophisticated circuitry all the way up to the latest advances in computer technology 24 TO-ain With a Powerful AT-Compatible — Now with 20 Meg Hard Drive and 1 Meg RAM! lb give you hands-on training with the absolute in state-of- the-art computer technology, NRI includes the powerful West Coast 1010 EScomputer as the centerpiece of your training. As you assemble this fully IBM AT-compatible micro from the keyboard on up, you actually see for yourself how every section of your computer works. You build this powerful West Coast 1010 ES computer, all the while gaining a true mastery of computer electronics. Best of all, it's yours to keep for all your professional and personal computing needs. You assemble and test your computer's "intelligent" keyboard, install the power supply and 5V* " disk drive, then interface the high-resolu- tion monitor. But that's not all. Your hands-on training continues as you install a powerful 20 megabyte hard disk drive— today's most- wanted computer peripheral— now included in your course to dramatically increase the data storage capacity of your com- puter while giving you light- ning-quick data access. Plus you work with exclusive word processing, database, and spreadsheet software, yours to use for your own professional and personal applications. As you build your com- puter, performing key demon- strations and experiments at each stage of assembly, you get the confidence-building, real- Your NRI computer training includes all this: • NRI's unique Discovery Lab* for circuit design and diagnosis • NRI's hand- held digital multimeter featuring "taik-you- through" instructions on audio cassette • A digital logic probe that lets you visually examine computer circuits "The new AT-compatible West Coast 1010 E5 computer with high-speed 80286 CPU, 101-key "intelligent" keyboard, 1.2 meg high-density floppy disk drive, 1 meg RAM (expandable to 4 meg), 64K ROM -> • 20 megabyte hard disk drive ■ MS-DOS, G W-BASIC, word proces- sing, spreadsheet, and database software • Reference manuals with programming guidelines and schematics NOW! AT-compatible computer and 20 meg hard drive! prepared to take advantage of todays oppor- tunities in computer service. You learn at your own convenience in your own home. No classroom pressures, no night school, no need to quit your present job until you're ready to make your move. And all throughout your training, you've got the full support of your personal NRI instructor and the NRI technical staff, always ready to answer your questions and help you whenever you need it FREE 100-Page Catalog Tells More world experience you need to won with, troubleshoot, and service today's most widely used computer systems. New! Explore the Latest Advances m Voice Synthesis Now NRI also includes innovative hands-on training in voice synthesis, one of today's most exciting and wide- ly applied new developments in com- puter technology. You now train with and keep a full-featured 8-bit D/A converter that attaches in-line with your computer's parallel printer port. Working with the exclusive text-to-speech software also included with your course, you explore the fascinating technology behind both digitized and synthesized com- puter speech. NRI's new hands-on training in voice synthesis is just one more way you get the confidence-building experience you need to feel at home with the latest advances in computer technology. Send today for NRI's big, 100-page catalog that describes every aspect of NRI's innovative computer training, as well as hands-on training in other growing high-tech career fields. If the coupon is missing, write to: NRI School of Electronics, McGraw-Hill Continuing Education Center, 4401 Connecticut Avenue, NW, Washington, DC 20008. School of Electronics No Experience Needed, NRI Builds It In This is the kind of practical, hands-on experience that makes you uniquely McGraw-Hill Continuing Education Center 4401 Connecticut Avenue, NW Washington, DC 20008 IBM md ATsrc regitund tetdenwufci of International Businns Machiraa Corporation 2«W SEND TODAY FOR FREE CATALOG I M*9M For Career courecs approved under Gl Bill L'J check f*>r details. McGraw-Hill Continuing Education Cerwtt 4401 Connecticut Avenue. NW. Washington, DC 20008 (4 CHECK ONE FREE CATALOG ONLV p Teleoommunieilionj □ Computet Electronics □ i^uanai Electronics U TV/ Video/ Audio Servicing p Electronic Circuit Design Q Robot ics o Basic Electronics O Electronic Music Tech nology p Book keeping & Accounting □ Security Electronics □ Building Construction □ Digital Electronics Servicing p Automotive Servicing m n Air Conditioning, Healing, &. Refrigeration G Small Engine Repair G Electrician D Luck smithing □ Travel Careers □ Writing G Paralegal □ Computer Programming Name (Please print) Age CiEy/Staie^Zip We'll give you iQmorrow- Acer edited Member _ . . — — I Z c > L ID 29 YOUR SOURCE FOR PROJECT ANO REPAIR ESSENTIALS PARTS HOTLINE Your nearby Radio Shack store has a huge selection of popular elec- tronic components. Plus, we can special-order 10,000 items from our warehouse— ICs. tubes, semiconductors, phono cartridges and styli, even SAMS* manuals. Service is fast and there's no minimum order or postage charge. BATTERY HOTLINE In addition to our large in-store stock. Radio Shack can now supply almost any currently manufactured consumer-type battery — for cord- less phones, computer memory, camcorders, transceivers, pagers and more. Service is fast. No postage or handling chargesi , 2 a a y u ~ pasouu oaoi-jL- qOBBD ttiiUQS Studfinder. Ends guessing, easy to use! Senses changes in wall density to find wooden studs fast- also wires, conduit, pipes. Battery extra. #64-2825 19.95 Super Calculator! The EC-4035 makes electronics math a snap. Displays and computes with elec- trical units— V, A, mA, mW. 110 functions. #65-983 39.95 16-Ptece Precision Tool Kit. Top- quality jeweler's-type philips, blade and nutdrivers plus hex keys and a torque bar. Fitted molded case. #64-1961 10.95 100-Watt Soldering Gun. Pull the trigger for full temperature in sec- onds. Built-in light. The comfort- molded handle stays cool. UL listed AC. #64-2193 10.95 CO O Z o F O UJ O Q < ir I Celling Started ■ '>» JS ebwUO Semiconductor "Sub" Book. Our 1991 edition lists over 95,000 types and the Radio Shack replacements. #276-4014 3.99 Getting Started in Electronics. By Forrest Mims HI. The perfect introduc- tion to project building. 128 pages #276-5003 2.49 THE PLACE TO SHOP FOR VALUE! Engineer's Mini -Note book Series. By For- rest Mims HI. Practical project ideas and use- ful data in Mims' famous, friendly style— big diagrams, handlettered text. With tips and suggestions for further experiments. NEW! Science Projects. #276-5016 .1.49 Timer ICs. 555/556 ICs. #276-5010 . , . 99« Op Amp ICs. #276-5011 1.49 Optoelectronics, #276-5012 1.49 Basic Circuits. #276-5013 1.49 Digital Logic Circuits. #276-5014 .... 1.49 Communications Projects. #276-5015,1.49 Formulas and Tables. #276-5016 1.49 Schematic Symbols. #276-5017 1.49 (1) Mini Audio Amp/Speaker. Ideal testbench amp, also great for com- puter voice /music synthesis. Battery extra. #277-1008 11.95 (2) Long -Lite Xenon Strobe Tube. With data. #272-1145 3.29 (3) Halogen Flashlight and Lantern Bulbs. HPR50. 6-volt. #272-1189. HPR52, 3V. #272-1190 . . Each 3.95 Pocket-Size Digital Multltester With Autoranglng. Really handy for any- one working with electronics. This tester folds, with its probes, to fit a shirt pocket. Features easy-to-read LCD display, continuity sounder. Mea- sures to 400 volts AC/ D C , 2 m ego h ms resistance. 4 1 /*x2 1 Jbx5/i6" #22-171 39.95 (1) Universal AC Adapter. 3, 4.5, 6, 7.5 or 9VDC output. With 6- piece Adaptaplug* set. #273-1650 12.95 (2) 1Vi-3VDG Motor. About 1 Vs" long. #273-223 99* (3) DC Pulsing Buzzer. Extra loud! #273-066 4.29 •> ffl / S "^ (3) (1) Reusable Cable Ties. Hang-up loop. #278-1622 . Pkg. of 10/4.99 (2) "Universal" Cable Clips. #278-1647 Pkg. 10/2.79 (3) Indoor/Outdoor Wire Ties. #278-1652 Pkg. of 30/2.99 (4) Markers. 630 stick-on letters. #278-1650 Set/1.79 (1) AC Sensor, indicates the pres- ence of 70 to 440VAC without direct electrical connection. Safety first! #22-103 9.95 (2) Neon Circuit Tester. 90-300V AC/DC. #22-102 1,99 (3) AC Outlet Fault-Finder. 3-prong for grounded outlets. #22-101 . . 5.95 Since 1921 Radio Shack has been the place to obtain up-to-date electronic parts as well as quality tools, test equipment and accessories at low prices. Over 7000 locations to serve you— NOBODY COMPARES Pnces apply at participating Radip Shack stores and dealers. Radio Stack is i division ol Tandy Corporation -Radio /hack AMERICA'S TECHNOLOGY STORE 30 CIRCLE 78 ON FREE INFORMATION CARD BUILD A Macintosh-Compatible COMPUTER CHARLES COLBY* At last, a Mac-compatible computer for people on a budget— and It can be cheaper and more powerful than the new Classic Mac from Apple! HAS THE HIGH COST OF OFF-THE-SHELF MACS kept you restricted to the confined wo rid of MS-DOS computers? Well, you can stop feeling confined be- cause, for about $400.00 and a few hours work, plus the cost of any A 128K through SE-30 Mac logiej board, you can build your owi Mac! And that price includes the case, power supply. 800K flop- py drive, special power/video_ ooard, video driver mooj ule. and a 14-inch Mae- compatible monitor. J The unit is 100% compatible with all Mac software, i since it uses th~ real Apple Mac- intosh main logic board or motherboard . Even the earliest mother- boards can be the start of a able powerful machine. For exam- clocl* pie, with third party add-ons. even you can increase the RAM of a add- Mac 128K through Mac SE to 19- o 1 , 2 . 5 . o r 4 megabytes : you can el h i increase the RAM on an SE-30 If to 4. 8. 16, or 32 megabytes! Mac There are accelerators avail- tosh «_ Filf Fdif 0Hnnn Uifir raai (jmnriHa Ful rrw| MwWBWg gflEagB tTlor,n! Wfft 3Li%- r r a] Radio BEtwnics snvs VQI) can BUILD flMRCINTOSHi (( able to let the unit run with a clock speed as high as 50 MHz even with a Mac 128K. With add-on boards, you can use a 19-or21-ineh 1024 x 768 pix- el high-resolution monitor. If you don't already have a Mac, any version of our Macin- tosh "clone" is a good starter ■ Charles Colby is It-ie president ot Colby Systems Corporation , a company specializing m portable computers, terminals, Macintosh-compatible computers, and accessories. machine. If you already have a Mac, you can put together a good second or third ma- chine. If you arc in any Mac- related service business, you'll especially appreciate how much easier it is to install or swap an internal component. That's because the case we use makes it easier to install or re- move a board or drive as com- pared to a standard Mac case. 0} o z o £ o D < EC Technical description As shown in the block diagram of Fig. 1. the desktop Mac con- tains a real Apple Macintosh motherboard. The Mac mother- board is a very cleverly designed self-contained computer — it con- tains all of the essential compo- nents. The CPU in the Mac 128K. 512K. 512KE, Mac Plus, and Mac SE is a Motorola 68000 16-bit processor running at 8 MHz; a 16-MHz Motorola 68030 32-bit processor is found in the Mac SE-30. The motherboard also contains bios ROM's, RAM, vari- ous glue -logic chips, a keyboard - and mouse-input processing IC, and a custom Sony sound pro- cessor. There are two serial out- put ports: one for a modem and one for a printer — there are no parallel printer output ports. A small computer system interface (SCSI) port is found on a Mac Plus, SE, and SE-30, although SCSI adapters are available for other versions. Also on the motherboard are the video chips that generate the Mac's 512 x 342 pixel, 22.5-kHz horizontal rate video. There are many third-party accelerators and big-screen video boards available for Macs; the Mac SE and SE-30 have expansion ports on the motherboard to accommo- date them, and there are special expansion devices available that clip over the 68000 chip in the 128K. 512K, 512KE and Mac Plus boards eliminating the need for the expansion ports. The motherboard Is the most important part of this or any other Mac-compatible project. They can cost anywhere from 50 to 1500 dollars, depending on which model you want. All that is needed to make the motherboard operate is a power supply, a video/sync adapter to drive an external monitor, a Mac- compatible floppy drive, an SCSI hard drive (optional), and a case in which to put them. The power supply is an IBM-PC clone type, so it is low in cost. We'll show you where to get ev- erything you need, and how to put it all together. We'll even show you how to build the interface that makes this project possible. There are some external ac- cessories required to make a complete operating computer, and one of them is a mouse or APPLE LOGIC BOARD 12BK. 512K, 512K PLUS, SE OR SE-30 (WITH COLBY SCSI ADAPTER! COLBY POWER/ VIDEO INTERWCE BOARD t POWER SUPPLY 1 + 5V. + 12V. 1 -12V, ~5V | 11 0/220 AC 50/60HZ FIG. 1— YOU CAN SEE FROM THE BLOCK DIAGRAM, that the Colby Mac contains a real Apple motherboard. trackball. There are two basic types of Mac mice and trackballs. The original type is for the Mac 128K, 512K, 512KE, and the Mac Plus. Those all have a male 9-pin "D" connector. The newer type used with the SE and the SE-30 has a 4-pin male mtni-DIN con- nector. They are known as ADB- type, which stands for Apple Desktop Bus which uses a pro- prietary Apple serial protocol. An IBM-PC type mouse or trackball will not work on a Mac. A keyboard is also required. The original keyboard for the Mac 128K, 512K, and Mac Plus uses a 4-pin modular jack like the one on the handset of a tele- phone. However, the wiring in a telephone cable is different than a Mac keyboard cable. Our desktop Mac uses a special 14- inch monitor. With a horizon- tal frequency of 22.5 kHz, it will not work with an IBM-PC or clone. It is available in either am- ber or paper-white phosphor ver- sions. The monitor will work with all Macintosh computers with a proper Colby interface. The one thing that sets our Mac apart from true Apple Macs is the power/video interface board that allows an IBM-PC style power supply, the monitor, and an Apple motherboard (logic board) to be connected together in one system. The interface board can either be built or pur- chased fully assembled. If you wish to build the board, PC foil patterns are provided, or you can buy a ready-made bare board. Where to buy parts Before building the interface board, let's discuss all of the other necessary components. where you can get them, and how much they cost. As mentioned earlier, you need an Apple 128K, 512K, 512KE, Plus, SE or SE/30 motherboard ($50.00 to $1400.00). a modified IBM-PC clone case ($89.00), a power sup- ply ($69.00), a keyboard ($89.00-$129.00} ( a mouse or trackball ($49. 00-879.00). a monitor ($189.00), a floppy drive ($189.00), and perhaps an op- tional 40-MB hard drive ($299.00-8399. 00). You'll also need the interface adapter board described in this article; it'll run you $59.00 in the assembled form (not including a $30 video/ sync processor module), or you can build it yourself. The most difficult part to find is the Apple motherboard. The PARTS LIST— 128K THROUGH MAC PLUS 1. Any Apple motherboard. 128K, 51 2K, 512KE or Mac Plus 2. PC case (Gettys Electronics) 3. 200-watt power supply (must fit in Gettys case) 4. 800K Mac-compatible internal floppy drive (must fit in Gettys case) 5. Modutar-plug type Mac keyboard 6. 9-pin D-type trackball or 7. 9- pin D-type mouse 8. 14-inch Mac-compatible monitor (optional adapter for regular Mac) 9. Power/video adapter board 10. 20-pin floppy cable 11. 10-conductor power cable 12. 9-conductor video output cable 13. Internal modular keyboard cabSe w/bracket 13. Cermagraph 740S video/sync processing module 14. 3.6V lithium battery for CPU real- time clock 32 INPUT M*OHi B A + I? 1 + 1 7V^ + ft V H S Y. WW I. R /\ ffin t rs CABLE o -: to a 3 QZ 3 O 2 s | > ?! CONDUCT Oft * 1r * t X -I I I I ) J2 I NOT ■ USED J4-a GRH . : m h'i»M«i+ al " .i . i. J II i II WHT 'N SPEAKER RESET CABLE / \ | APPLE MAC 12HK.51!K.S12KE OR MAC PLUS MOTHERBOARD 5V SPIN MINI DIN o o (MAC PLUS ONLY) vP^i (MAC PLUS ONLY) SCSI PORT \ 9-PIN J ^ 1 9-PIN D J I M-PIH P ] [ 9-PIH D J \ 9-PW J g^* QJ) t 1 t t I n_r it (ON FRONT) KEYBOARD 3.5MM T" PROGRAMMERS P.fl. SWITCH (ON MOTHERBOARD) RESET P.B. SWITCH MOUSE EXT. HARD DRIVE ^ KEYBOARD ^ EXT SPEAKER FIG. 2— SCHEMATIC FOR THE 128K, 51 2K, 512KE. and Mac Plus versions. first Mac board, the 128K, sells for 850-8100, but the 128K RAM & old ROM's limit the software that you can use. Although the 512K version ($199-8299) has more capacity, it, too, is limited to older versions of software. However, there are RAM-upgrade kits available for both models. The 512KE version ($299-$399) has enhanced ROM's. It works with later software and the RAM can be expanded. The Mac PLUS, 8399-$499, is the workhorse of the Mac line — more of them are in use than any other type. It has later ROM's, and can hold 4 MB of RAM. It runs most current Mac software and, although it has no expan- sion slot, its speed can be in- creased with an add-on acceler- ator board. The Mac SE, $499-$599, has an expansion slot, a 68000 16-bit processor running at 8 MHz, and 4 MB of RAM. It runs all current Mac soft- ware and can be accelerated to 50-MHz operation. The SE/30 model, $1200-81500, is very fast at 16 MHz, and has a 68030 32- bit processor with a math co-pro- cessor and an expansion slot. It runs all current Mac software and can also be accelerated to 50- MHz operation. There are many Apple dealers who sell parts and mother- boards, other than those men- tioned in our sidebar; check your local phone book. There are also hundreds of local computer deal- ers (not just specifically Apple) who stock Apple parts and vari- ous motherboards. While there must be over one hundred IBM-PC clone cases available, there is only one model we have found to be suitable for use with a Mac motherboard. The unit has been modified by a company called Gettys Elec- tronics. They put a long horizon- tal slot at the back along the bottom of the rear panel, which allows the connectors on a Mac motherboard to protrude through the opening and elimi- nates the need to cut and file heavy sheet steel. The case will work with any of the Mac mother- boards. All of the necessary mounting holes have also been > Z c > 33 added, as well as provisions for the Mac reset function. The case comes with a bag of all the screws and standoffs you will need to mount the Mac motherboard, power supply, and floppy drives. It also comes with the cables re- quired to connect the power sup- ply to the adapter board, hook up the key switch, connect the green power LED, the reset button, the hard-drive access LED, and the Mac programmer's switch (mis- labeled "turbo" on the front panel of the case). All of that adds up to a big savings in assembly time. Not included with the case are the logic-board-to-power-adapter cable, video-output cable, hard- drive cable, and the mounting brackets for 3 '/2-inch hard driv- es. (A 5'A-inch hard drive will mount easily without adapter brackets.) The power supply for the case, which provides +5, -5, + 12, and - 12 volts is rated at 200 watts; quite a bit higher than is required, so the system will always run cool. There are some cables that are required inside the case, but not included, to connect the major components. One of them is the power signal cable from the inter- face board to the Mac mother- board, and there are two types. Type 1, a 10-conductor cable, is for use with 128K, 512K, 512KE and Mac Plus motherboards. Type 2, a 12-conductor cable, is for use with the SE and SE-30 motherboards. The required motherboard-to-floppy-drive ca- ble provides both power and sig- nals in one 20-pin flat cable. The video/sync output cable goes from the power/video interface board to the rear panel of the unit. It is a 10-pin-to-9-pin cable. The optional 50-to-50 pin SCSI hard-drive signal cable goes from the Mac motherboard to the hard drive. All cables must be built or purchased from one of the sources mentioned. Add-on video boards Most add-on boards for the m Mac 128K through Mac SE will o work in the Colby Desktop Mac. § Although Apple has never man- fE ufactured big-screen boards for v the early Macs, many after- ij} market companies do. One prob- er lem with some add-on video g boards is that they are designed cc to plug into Apple SE-30 mother- MAC VS IBM-PC m The Apple Macintosh was Introduced January 1. 1984 with the now-famous TV commercial shown during the Superbowf football game where the girl in jogging shorts throws a sledgehammer into a movie screen amid an audience of "fol- lowers" with shaved heads, all dressed alike, bowing to a uniformed "leader." The "leader" was Intended to be represen- tative of IBM. Apple's message was 1984 won't be like 1984. Did it work? Apple's challenge to the IBM domi- nance of the personal-computer market has produced sales of five or six million computers, vs IBM and clones of 40 to 50 million units. Who won? Both did, and are continuing to win, as the need for small computer systems accelerates world- wide. The clear advantage of the Mac's easy-to-learn, easy-to-use graphical in- terface and operating system makes it possi ble to do p roducti ve wo rk on a Mac i n one tenth to one fiftieth of the time re- quired to become proficient at some MS- DOS based programs on an iBM-PC or clone. Time will tell what effect Windows"" 3.0 will have in the race between the IBM world and the Mac world. Many people think the Mac will triumph. Yet the ab- sence of true Mac clones (Apple will not let it happen) has kept the cost of the Macs very high in relationship to the relatively tow prices found in the IBM-PC and clone arena. The Mac 128K was a true major innova- tion in it's day, and innovations continue. For example, system 7.0, due out anytime now, promises to add many new features. The Mac paved the way to desktop pub- lishing by providing the first small comput- er with bit-mapped graphics, WYSIWYG text, and an innovative easy-to-use oper- ating system that changed the face of per- sonal computing. Even six years later, the 128K Mac is still a useful machine and can do simple word processing and drawing functions almost as well as the latest $11,000.00 Mac FX. Apple isn't known for low prices, but it is one of the few companies ever to go from two guys building computers in a garage to a m u Iti-b il I io n dol lar year ly sa tes org ani - zation with six or seven thousand em- ployees and a billion dollars in the bank...atl in a span of 12 years. R-E boards at a right angle. These boards will not work with the case we described because they are too high. We do know that boards from E-Machines, Inc., Lapis Technology, Sigma De- signs, Nutmeg, Moniterm, and Colby Systems will work in the Colby Mac. Of course, if you use a bigger case, you can use what- ever size boards you like. Colby Systems Corporation manufactures 640x480 mono- chrome, gray scale, 8- or 24-bit color, and 1024x768 mono- chrome boards for 19- and or 21- inch monitors that mount paral- lel with the motherboard. Colby also makes right-angle adapter board (SE-30 RAB, 849.99) that adapts most SE-30 boards to work with the case we used. Accelerator boards Two of the best companies, in terms of technical support, price, variety of products, and state-of- the-art offering, that make add- on accelerator boards for Macs are Dove Computer and Total Systems Incorporated (TS1). You can purchase their products through dealers, mail-order, and Colby Systems, as well. Dove Computer has a line of medium- to high-end acceler- ators that enable you to add a 33- MHz 68030 processor to a Mac 128K! They also have a low-cost ($500.00) 68030 accelerator for a Mac SE-30 that doubles the speed to 33 MHz. TSI has two lines called Gemini and Gemini II. The lower-cost Gemini series consists of 16- and 20-MHz 68020 and 68030 accel- erators with versions available for Mac 128K through Mac SE-30, The Gemini II series is available in speeds from 33 to 50 MHz. The big advantage of accel- erators is that the older mother- boards may be brought up to speeds comparable with the latest Macs. One problem that plagued early Macs was the power supply, which could deliver only about 35 watts — barely enough to run the standard motherboard, a 9-inch CRT, a floppy drive, and a key- board. Once you started adding accelerators and hard drives, many power supplies went up in smoke. Apple has since re- designed the power supply in the Mac SE and SE-30 to output 60 watts. But because of the early problems, most reputable accel- erator manufacturers have a sep- arate 110 VAC-to-5 VDC power supply available to run the accel- erator to prevent overloading the Mac's power supply. If you use a hefty enough power supply, you can save some money when you buy an accelerator. For example, all Dove and TSI accelerators are available without the additional power supply at a correspon- dingly lower price. 34 FIG. 3— SCHEMATIC FOR THE Mac SE and SE-30. Building the Mac Let's go over, step-by-step, the procedures necessary to get your Macintosh-compatible computer up and running. A wiring sche- matic for the 128K. 512K. 512KE, and Mac Plus versions is shown in Fig, 2, and one for the Mac SE and SE-30 is shown in Fig. 3. Regardless of which version you're going to build, you will need the power/video interface board. Should you decide to build the board yourself, a parts- placement diagram is shown in Fig. 4. A photograph of the com- pleted board is shown in Fig. 5. The first step is to make sure that the motherboard will fit in your case. There is a vertical met- al tab, 2-inches high by 1-inch wide, near the two PC-mounted pushbuttons at the rear of all Mac PARTS LIST FOR MAC SE & SE-30 1 . Apple SE or SE-30 motherboard 2. PC case (Gettys Electronics) 3. 200-watt power supply (must fit in Gettys case) 4. 800K Mac-compatible internal floppy drive (must fit in Gettys case) Colby FDD-800K 5. ADB-type Mac keyboard 6. ADB-type trackball or mouse 7. 14-inch Mac-compatible monitor 8. Power/video adapter 9. 20-pin floppy cable 10. 14-conductor power cable 11. 9-conductor video output cable 12. Cermagraph 4723N video/sync processing module motherboards. You will probably have to bend the metal tab paral- lel with the motherboard to clear the new case. The tab on the op- posite side of the board must also be bent down, but not as low as the other tab. The only difference between a Mac 512K and a 512KE mother- board is that the 512KE has en- hanced 128K ROM's (versus the older 64K ROM's). The later ROM's are available as upgrades. Do not attempt to copy Apple ROM's, as doing so would be a copyright infringement, and Ap- ple has prosecuted many people who have copied their ROM's. If you obtain a motherboard with- out ROMs, they are installed in two 28-pin sockets on the moth- erboard, one marked ROM LO and one marked ROM HI. The Apple ROM marked 342-0342-A, B, or C goes in the ROM LO socket and the ROM > z c > -< id 35 J12 ■ i * - !■ * h " A * * c '-" cl c a o-w- m ^4 —. ] ffio^^^ oK o o o-g jTo gj FIG. 4— PARTS-PLACEMENT DIAGRAM lor the power/video interface board. marked 342-0341-A, B, or C goes in the ROM HI socket. Those numbers are for 128K ROM's. The FIG. 5— THE COMPLETED POWER/VIDEO INTERFACE BOARD. It is the key to build- ing your own Mac. sf* ^r ^r ^r ■*■ * + 4.6V n n r -i r -i C u 1 \ - _ + 5V -12V + 12V N.C. MISSING PIN - — — ■# A -5V -12V * * * * + 5V + 5V + 12V g z o CE H LU o Q KEY FIG. $— MEASURE THESE VOLTAGES on the two connectors on the power/video Interface board. The pins that are marked with an asterisk should have no more than 2 volts on them when not connected to the motherboard. early 64K ROM's for pre-Mac 512KE motherboards are marked 342-022-A for ROM LO and 342-0220-A for ROM HI; they should be used only with 128K and 512K motherboards running very early Mac software, 400K single-sided floppies, and no hard drive. Mac SE ROM's are marked 342-0353A for ROM LO and 342-0352A for ROM HI. Mac SE-30 ROM's are on a single SIMM-type (single inline memory module) PC board, and not in 28- pin sockets. The latest ROM for an SE-30 is marked 638-4339. Plug in the two cables from the power supply. P8 and P9, into J12 on the power/video interface board. Measure the voltages on JI1 and J14, on the power/video interface board as shown in Fig. 6. An 8-ohm, 20-watt resistor must be used as a dummy load on the + 5-volt line to obtain proper readings. In a Mac 128K through Mac Plus, plug in the 10-conduc- tor cable from Jll on the power/ video interface board to J7 on the Apple motherboard. Plug in the 1-conductor cable from Jll on the Apple motherboard to J2 on the power/video interface board. Plug in the 2-conductor cable from the speaker to J4-a on the power/video interface board. In a Mac SE or SE-30, plug in the 14-conductor cable from J14 on the power/video adapter board to J 12 on the Apple motherboard. Plug in the 1-conductor cable from Jll on the Apple mother- board to J2 on the power/video interface board. Plug in the 2- conductor cable from the speaker to J4-a on the power/video inter- PARTS LIST— POWER/VIDEO ADAPTER R1— 330 ohms, Vi-watt C5, C6— 170 u,F, 16 volts, electrolytic C1-C3 — 47 pF, ceramic disc C4, C7— 47 (j.F, 16 volts, electrolytic D1, D2— 1N4001 rectifier diode 1C1 — Cermagraph video/sync pro- cessing module (740S or 4723N) J11 — 12-position right-angle Molex connector with key J12 — 12-position Molex connector without key J14 — 14-position connector with key J10— 10-position video & sync con- nector J2, J2-a— 2-pin header J3 — 3-pin header J3-a, J3-b, J4-a — 4-pin headers J5 — 5-pin header Miscellaneous: PC board, 24-pin lC socket, solder, etc.. Note: The following items lor the power/video interface are avail- able from Maus Electronics: A bare PC board (#CMP-101), $19.99; a PC board and all parts except the video/sync module (#CKP-128), $36.99; an as- sembled and tested power/video interface ( § CAT-1 28), $59.99. BE AWARE that the cables and the video/sync module are not in- cluded in any of the kits. The modules are available for $29.99. A step-by-step build-it-yourself video is available from Colby Systems Corporation for $19.99 plus $3.99 postage and handling (-? FS-80GK). A new book, "Build- ing your own Colby Mac Desk- top and Colby Mac Portable," will also be available from Colby Systems. Call, write, or lax for more information. face board. The inside of a medi- um-cost SE version is shown in Fig. 7 and the inside of an SE-30 is shown in Fig. 8. The extra boards you see inside the SE-30 are for the Colby voice navigator [$499), which allows you to per- form certain tasks using voice commands rather than a mouse or trackball. The voice navigator is shown in Fig. 9. Turn on the power and, within 2 seconds, you should hear the familiar Mac "boing" sound on Macs 128K through SE and the multi-note 0.5-second chime on the SE-30. Those sounds indi- cate that the Mac motherboard has run through and suc- cessfully completed its on-board self-diagnosis routines. If you do 36 MACSE MOTHERBOARD POWER SUPPLY COLBY POWER/VIDEO BOARD FIG. 7— THE INSIDE OF THE MEDIUM-COST SE VERSION. BOOK FLOPPY DRIVE (ABOVE) 80MB HARD DRIVE IBELOW) APPLE SE-30 MOTHERBOARD DOVE 33MHz ACCELLERATOR 1, POWER SUPPLY COLBY VOICE NAVIGATOR VOICE RECOGNITION SYSTEM BOARD (CONNECTED TO INTERNAl SCSI CABLE) COLBY INTERFACE BOARD 8— THE INSIDEOFTHESE-30VERSION.Trieextra boards you seeareforthe Colby voice navigator and big-screen driver board. not get either of those sounds, or you get a brash sound or none at all on a Mac 128K through Mac Plus, or a multi-note chime that lasts for about V/z seconds, then there is a problem on (he mother- board. If that's the case, recheck the voltages at J7 or J 12 on the motherboard. Recheck the ROM's to be sure they are in the correct sockets, that they are seated correctly, and that there are no pins folded under. Re- check the RAM; be sure it is seat- ed correctly and that R8 and the jumpers are set correctly. If you have access to a Mac that you know is working properly, you can test the RAM SIMM's in that unit to verify that they are good. Plug in the following cables one by one. and turn on the power after plugging each cable in to verify that you hear the correct boing or chime each time. By doing so, if there is a shorted or misplaced cable, you will know which cable is the suspect as you plug il in. All J numbers referred to are on the power/video inter- face board. Plug the 10-position video-output cable into J 10. Plug the 9-pin "D" cable and verify that you have a raster on the CRT. There should be about a 1-inch black area between the edge of all sides of the raster and the plastic case bezel. Plug one end of the 4-conduc- tor reset cable into J4; the other end with the I x Vi-inch PC board adapter plugs onto the 4 contacts on the top of the two black plastic pushbutton switches on the left rear of the Apple motherboard. Bend the pushbutton contacts so they are vertical and plug the adapter PCB on so the 4-conduc- torwire comes off toward the cen- ter of the motherboard. Plug the 5-connector cable from the power-on LED and key- lock switch into J5. With the key- lock switch in the "on" (un- locked) position, verify the boot boing or chime. Then turn the key lock switch to the locked po- sition and make sure you don't get the boing or chime. That es- sentially shorts the contacts on the programmer's switch and keeps the motherboard from booting. Plug the connector with the or- ange, black, and white wires from the "turbo" pushbutton onto J3. Test the switch by turn- c > ja < CO 37 ing on the power, waiting for the Mac raster to appear: then press the switch and a dialogue box should appear in the center of the screen. Note that it is not actually a turbo switch; it is used for ac- tivating the Mac function known as "programmer's switch" (see an Apple manual for a complete ex- planation). Also, the pushbutton switch is not exactly the right type for a programmer's switch ; it is a push-push alternate action type where it actually should be a momentary pushbutton. If you like, you can unsolder the switch from the PCB next to the key lock and replace it with the correct type of switch, or just remember to push it twice if you use it. Unless you plan to do any programming, you will not need to use it. The switch can also function as a simple "lock" for your computer. If you press it once and lock the button in. the computer will not boot. Now plug in the 2-conductor black and white cable that goes to the front panel "reset" pushbut- ton. Test it by turning on the power and waiting for the boing or chime. When you press the button, the computer should re- set; that is, it should boing or chime after each press. Plug in the 20-conductor rib- bon cable from J6 on 128K through Mac Plus boards or J8 on SE or SE-30 boards to the floppy drive. The cable is keyed so it cannot be inserted incorrectly. It also has several internally cut wires to make it work correctly with the Mac motherboards. Plug in a mouse (or trackball} and a keyboard at the rear of the motherboard. Add an internal or external hard drive as desired. In- sert an Apple system disk in the floppy and boot the computer so you get the Mac desktop. Table 1 shows the various combinations of system versions that work with different Mac motherboards. Note that motherboards with 64K ROM's use System 4. 1, up to 6.0. Mac Plus motherboards (128K ROM's) use System 6.1 to 6,04. System 6.04 is the most bug- free, but is too large for use without a hard drive. If there is no hard drive, system 6.03 is rec- ommended. System 6.05 is not recommended for the Plus or SE series; use it on the Mac FX Ilci, etc.. FIG. 9— THE VOICE NAVIGATOR allows you to perform certain tasks using voice com- mands rather than using a mouse or trackball. FIG. 10— THE COLBY SIMM ADAPTER BOARD requires that 2 DIP'S be removed and about 22 wires and a daughter board to be soldered onto the motherboard. It allows you to use standard 256K or 1-MB SIMM's. Memory upgrades With the advent of HyperCard™ and many other later applica- tions that require one megabyte or more of RAM, it becomes more and more important to add RAM to run the latest software. Simply install each SIMM module with chips to the right of the SIMM by pressing the SIMM module firmly in the socket at a 45-degree angle and gently rolling it back until it snaps into place. Originally, the only way to up- grade memory on a Mac 128K, 512K or 512KE was to unsolder the old RAM chips and solder in newer, higher-capacity chips. More often than not, that re- sulted in damaging the fine SOURCES OF MAC PARTS Fremont, CA 94538 Phone: 415-683-2226 MEMORY AND ROM UPGRADES • Applied Engineering • Colby Systems Corp. PO Box 5100 • Dove Computer Carrollton, TX 75011 • Total Systems Inc. Phone: 214-241-6060 MAC MOTHERBOARDS • Colby Systems Corp. • Your local computer or Apple deaier 2991 Alexis Drive • Mac Heaven Palo Alto, CA 94304 • Pre-Owned Electronics, Inc. Phone: 415-941-9090 • Shreve Systems Fax: 415-949-1019 MAC-COMPATIBLE KEYBOARDS AND • DataDesk Int'l. MOUSE OR TRACKBALL 7651 Haskell Ave. • Abaton Technology Van Nuys, CA 91406 • Any Apple dealer Phone: 800-826-5398 • DataDesk Intl (in CA: 800-592-9602) • Colby Systems Corp. • Dove Computer SPECIAL CASE AND POWER SUPPLY Phone: 919-763-7918 • Gettys Electronics • Gettys Electronics HARD DRIVES (20 to 300 MB) 22018 Frontier Rd. • Any Apple dealer Clovis, CA 93618 ■ Cotby Systems Corp. Phone: 209-299-7828 • SuperMac Technology • Mac Heaven HARD DRIVE BRACKETS, CABLES. 14101 Park Long Court AND FORMATTING SOFTWARE Chantilly. VA 22021 • Maus Electronics Phone: 703-263-2567 • Colby Systems Corp • Maus Innovations MACK-COMPATIBLE INTERNAL 121 S. Corona FLOPPY DRIVES Denver, Co 80209 (you must use the Colby FDD-800K in the Phone: 303-744-9512 case we used) • Nuvotech • Colby Systems Corp. 2015 Brtdgeway Ste 204 MAC-COMPATIBLE EXTERNAL Sausalito, CA 94965 FLOPPY DRIVES Phone 415-331-7815 • Any Apple dealer • Pre-Owned Electronics, Inc. • Colby Systems Corp. 30 Clematis Ave * Appied Engineering Waltham. MA 02154 POWER & VIDEO CABLES AND VIDEO Phone: 617-891-6851 PROCESSOR MODULE Fax: 617-891-3556 • Maus Electronics • Shreve Systems MAC II COMPATIBLE 14" MONITOR 2421 Malcom St. • Colby Systems Corp. Shreveport, LA 71108 • Nuvotech Phone: 318-635-1121 APPLE MACINTOSH OPERATING SYS- Fax: 318-865-2006 TEM SOFTWARE • SuperMac Technology • Any Apple dealer 485 Potrero Ave. Sunnyvale, CA 94086 ADDRESSES Phone: 408-245-2202 • Abaton Technology • Total Systems Inc. 48431 Milmont Dr. Phone: 503-345-7395 traces of the motherboard. Also, the fact that the board is a four- or six-layer board makes deso- ldering very difficult. There is now an easier way to upgrade 128K and 512K motherboards without desoldering all the old TABLE 1 Version System Finder Mac 128K 4.1 5.5 Mac 51 2K 4.1 5.5 Mac 512KE 6.0 to 6.04 6.1-6.1.4 Mac Plus 6.0 to 6.04 6.1-6.1,4 Mac SE 6.0 to 6,04 6,1-6.1.4 Mac SE-30 6.0 to 6.04 6.1-6,1.4 RAM chips one-by-one. The Colby SIMM adapter board requires only 2 DIP's to be re- moved and about 22 wires and a daughter board to be soldered onto the motherboard, as shown in Fig. 10. That will save you about 3—4 hours of work, is much less likely to damage your motherboard, and allows you to use standard 256K or 1-MB SIMM's instead of discrete RAM chips. It also has a built-in SCSI port to enable you to operate a hard drive on a Mac 128K or 512K (128K ROM's are required). The Mae Plus motherboard was the first Mac to use SIMM RAM. Unlike IBM-PC clones, the Mac uses only eight chips per SIMM instead of nine, because there is no provision for parity checking. There are two types of SIMM's that will work on this unit; 256K and 1-MB types. In general, they can be identified by inspecting the individual RAM ICs. The 256K chips have leads on all four sides, whereas the 1- MB chips have leads on only two sides. The Mac Plus can be config- ured with 1 MB consisting of four 256K SIMM's, 2 MB consisting of two 1-MB SIMM's, 2.5 MB con- sisting of two 256K SIMM's and two 1-MB SIMM's, or 4 MB con- sisting of four 1-MB SIMM's. One megabyte of memory (four 256K SIMM's) is normally pres- ent in the Mac Plus. It is located on four SIMM's at an angle of about 45 degrees to the main board in front of the 68000 pro- cessor. Remove all four of the SIMM's currently installed in your Mac Plus. Use your finger- nail or small screwdriver to gent- ly bend the plastic locking "tabs out to the left and right to release the SIMM. CAUTION: The plastic retaining tabs will break very easily if you are not careful. Push them only enough so they clear the edge of the SIMM. Locate resistor R8 in the corner of the motherboard nearest the printer port; clip it on one end and bend it aside to prevent con- tact. Do not remove it, so that if you want to reconfigure your Mac Plus back to one megabyte, you can do so easily. Starting with the SIMM slot in the rear nearest the 68000 pro- cessor (row 1), install a 1-MB SIMM module in the rear socket on the Mac Plus motherboard by pressing it firmly into the socket at a 45-degree angle and gently rolling it back until the locking tabs snap into place. For 2.5 MB, two of the original Mac Plus 256K SIMM's go in the third and fourth sockets and two 1-MB SIMM's go in the first and second. For 4 MB, all four sockets must be filled with 1-MB SIMM's, Replace the keyboard, mouse, and other attachments and power-up your Mac Plus. To test the memory installation, pull down "About the Finder" under the Apple DA menu for the regis- tered amount of RAM, Note that with memory configurations > C > id 39 larger than 1 MB, the Macintosh will take an extra 15—30 seconds to boot up. Like the Mac Plus, the Mac SE motherboard has 4 SIMM sock- ets and can be configured with 1 MB. 2 MB. 2.5 MB, or 4 MB of RAM. There are two versions of the SE motherboard and the placement of the SIMM's and jumper differs, so you must de- termine your logic board type. Type 1 has resistors and no jumper, and type 2 has a jumper on the header. Adhere to the in- structions pertaining to your particular motherboard. One megabyte of memory is typically installed in most SE motherboards with four 256K SIMM's filling the four memory SIMM slots. Remove all four origi- nal SIMM's, working from the front to the rear on both sides. If your SE has a resistor, clip the R35 resistor on one end and bend it aside to prevent contact. Do not remove it, as you may want to reconfigure to 1 MB later on. The SE memory requirements with resistor R35 are as follows: For 2 MB. install two 1-MB SIMM's in SIMM sockets 1 and 2 (second row). For 2.5 MB, install two 1-MB SIMM's in position 1 and 2 (first row). Place two of the Apple 256K SIMM modules in po- sitions 3 & 4 (second row), and completely remove the jumper. For 4 MB, install four 1-MB SIMM's in all four positions and completely remove the jumper The three-pin jumper tells the SE what type of SIMM's are in use. The standard configuration is 1 MB of memory consisting of four 256K SIMM's installed in both rows. The jumper will be in- stalled on the jumper block ter- minals labeled "1M." The memory requirements for the SE version with a jumper are as follows: For 2 MB, install two 1- MB SIMM's in sockets 3 and 4 (second row). Move the jumper to the jumper block terminals la- beled "2/4 MB." For 2.5 MB, put two of the Apple 256K SIMM modules in positions 1 and 2 (first row). Install two 1-MB SIMM's in positions 3 and 4 (sec- ond row), and completely remove the jumper. For 4 MB, install four 1-MB SIMM's in all four positions and completely remove the jumper. Replace the keyboard, mouse, o c/ o o THE COMPONENT SIDE of the power/video interface board. THE SOLDER SIDE of the power/ video interlace board. and other attachments and power- up your Mac Plus. To test your memory installation, pull down "About the Finder" under the Apple DA menu for the regis- tered amount of RAM. The Mac SE-30 can be configured as fol- lows: 1 MB with four 256K SIMM's in bank A, 2 MB with four 256K SIMM's in bank A and four 256K SIMM's in bank B, 4 MB with four 1-MB SIMM's in bank A, 5 MB with four 1-MB SIMM's in bank A and four 256K SIMM's in bank B, 8 MB with four 1-MB SIMM's in bank A and four 1 MB SIMM's in bank B, 16 MB with four 4-MB SIMM's in bank A, and 32 MB with four 4-MB SIMM's in bank A and four 4-MB SIMM's in bank B. Note: Since the Mac SE-30 runs at 16 MHz, it is rec- ommended that 80 ns RAM be used (denoted by a -8 or -80 suffix on the part number on the indi- vidual chips on the SIMM}, You must remove the original SIMM's found on your SE-30 motherboard if you are installing 1-MB SIMM modules. Note: This step is not necessary if you are installing 2 MB. Gently bend the plastic locking tabs out to the right and left to release the SIMM module. Rotate the SIMM for- ward to clear the locking tabs and remove all four SIMM's. Place the SIMM's on a non-static surface, such as the anti-static bags and pink foam supplied with your new SIMM's. Repeat this same procedure until all of the original SIMM's are removed. Install each SIMM module with chips to the right of the SIMM by pressing the module firmly in the socket at a 45-degree angle and gently rolling it back until it snaps into place. 256K SIMM's are about S24.99, 1-MB SIMM's are about $49.99, and 4-MB SIMM's are about $299.99. R-E 40 Build A Negative Ion Generator IF YOU'VE SEEN ADVEKTISE- ments for negative Ion generators in mail- order catalogs and wondered how they work, this project is for you. The simple version de- scribed here provides in- sight into their theory and applications, and is both in- formative and entertaining. Some of the demonstra- tions you can do with it will amaze you and your friends. Many claims have been made for the beneficial at- tributes of negative at- mospheric ions on human and plant life, especially by a Dr. Albert Krueger of the University of California. Studies have shown that negative ions promote phys- ical and mental alertness and well-being, while positive atmospheric ions [such as in polluted air) cause discomfort and lassitude. Certain negative ion prop- erties can be demonstrated. For example, the surround- ing air after a thunderstorm smells clean and fresh, due to generation of negative ions from lightning. The negative ions attach to smoke, dust, and pollen particles, bringing them to the ground to discharge, leaving fresh, clean air. That's why a cool room with a breeze is invigorating, compared with one that's stiflingly heated. Cool air is generally negatively ionized, whereas heated air is generally positively ionized. Negative ions are air molecules with one or more excess elec- trons, produced in this case by a low-power, 9 to 14-kiIovolt DC supply. The positive terminal is grounded, and the other (the emitter] is a needle exposed to air. (To generate positive ions, the po- larities would be reversed.) Extra electrons on the emitter's surface produce a high local electric field owing to its pointed shape. The electrons exit the emitter needle's Build this negative ion generator and put some charge in your life. ANTHONY J. CARISTI WARNING!! This article deals with and involves subject matter and the use of materials and substances that may be hazardous to health and life. Do not at- tempt to implement or use the information contained herein, unless you are experi- enced and skilled with respect to such subject matter, materials, and sub- stances. Neither the publisher nor the au- thor make any representation as for the completeness or the accuracy of the infor- mation contained herein, and disclaim any liability for damages or injuries, whether caused by or arising from the lack of completeness, inaccuracies of the in- formation, misintepretations of the direc- tions, misapplication of the information, or otherwise. surface due to the polariza- tion of surrounding air mol- ecules between the emitter needle and ground. The electrons collide with the air molecules and produce negative ions. A common misconcep- tion regarding high-voltage corona or arcing is that elec- trons are "overcrowded" on the tip, and forced off by mutual repulsion. What ac- tually causes corona is the high electric field at the tip, which is directly propor- tional to the voltage, and is enhanced by sharpening an electrode tip to a fine point. The high electric field strains the air molecules, polarizing them by a phe- nomenon called dipole po- larization. If the electrode is positive, electrons are liter- ally ripped off, creating positive ions, or if the elec- trode is negative, they're forced to accept electrons, creating negative ions. High- voltage supplies like those in TV's need careful design, so no undesired dis- continuities like sharp points or edges cause arc- ing. However, for the nega- tive ion generator discussed here, the goal is to generate corona, not to avoid it, and the high electric field in the vicinity of a discontinuity more readily polarizes and ionizes air molecules. The reason for the high electric field at the tip of 9 needle is due to its small localized radius of curvature. A sphere has a much more uniform electric field at its surface, due to its con- stant and much larger radius. The audible hiss caused by a high -voltage discharge is called "corona wind, " and is often heard in older large-screen color TV's, especially on humid days, when the breakdown potential of the surrounding air is reduced, mak- ing the flyback transformer arc. You can often also feel it, if the corona is strong enough. The negative ion generator de- > Z C > 41 en o z o a. P o ui _i LU 9 Q < scribed here is low-cost, easy to build, and uses a high-voltage flyback transformer from an old black-and-white TV. It generates high voltage, but at very low cur- rent. However, the safety precau- tions taken for any high-voltage device should be observed here. The circuit The schematic of the negative ion generator appears in Fig. 1; T2 is a TV flyback transformer with an open ferrite core partially enclosed in an aluminum brack- et. The only original connections used are one low-voltage tap as ground, and the lead connecting to the flyback transformer out- put winding (at right), The other low-voltage taps aren't used, and the new feed- back and bifilar primary wind- ings are wound on the ferrite core. The bifilar primary winding goes to the collectors of an asta- bie multivibrator made up of Ql and Q2, with the center tap driv- en by the +3—5 volts DC from 1C1. The as table energy-storage elements are the inductances of the new feedback and bifilar pri- mary windings. The term bifilar means a pair of transformer windings optimally coupled by having been wound in the same direction, either adja- cent to or, preferably, superposed on top of one another. The feed- back winding goes to the bases of Ql and Q2 for positive feedback, with the center tap driven by the + 3-5 volts DC from 1C1 through R3 . The transistors are then for- ward-biased by the opposite ends of each half of the feedback wind- ing. When power is applied, the cur- rent through Ql and Q2 is une- qual, due to differences in doping, layer thickness, and base-emitter (B-E) turn-on volt- age. That's what causes oscilla- tion; if all the as table parts were perfectly balanced (nearly impos- sible), it might not oscillate at all. Whichever transistor carries higher current saturates due to positive base feedback, and the other cuts off. When the sharp increase in transistor current in half the bi- filar primary winding is max- imized, the induced voltage reverses, so the second tran- sistor conducts and the first one cuts off. The collector waveform FIG. 1— THE SCHEMATIC OF THE NEGATIVE ion generator. T2 is a TV flyback trans- former; only its output winding is used, and new feedback and bifilar primary windings are wound on the ferrite core. The bifilar primary winding goes to the collectors of astabie Q1-Q2. Its square wave induces high voltage into the flyback transformer output winding, boosted followed by a ladder voltage-tripler -9 to -14 kilovolts. 5" "2" "3" "4" "1""6" TO FtYBACK TRANSFORMER FERRITE CORE FIG. 2— THE PARTS-PLACEMENT DIAGRAM for the main PC board; Ql, Q2, and IC1 have U-shaped 1 <1-inch copper heatsinks, with silicone grease for heat transfer; each goes on the main PC board without insulators. In the prototype, SI, S2, F1, and NE1 were omitted, and T2 was salvaged from a small-screen TV; note the new feedback and bifilar primary windings. Pin 7 had the highest resistance relative to the flyback transformer output lead, so it becomes ground. fundamental frequency was 23.26 kHz, although higher har- monics greatly extend the total bandwidth. Also, the peak-to- peak bifilar primary winding voltage is four times that of the supply. The astabie square wave in- duces voltage into the flyback transformer output winding, proportional to the transformer turns ratio. A flyback trans- former bifilar primary winding is normally quite small, while the flyback transformer output winding normally has about 2000-2500 turns, inducing -3 to -4 kilovolts. Since the negative ion gener- ator needs to produce — 9 to — 14 kilovolts DC, a ladder voltage-tri- pler with six diode-capacitor rungs is used to half-wave rectify and multiply the flyback trans- former output voltage. Its opera- tion is best understood in 42 PARTS LIST All resistors are ! i-watt, 5%, unless otherwise noted. R1 — 1000 ohms, PC-board mounted po- tentiometer R2 — 220 ohms R3, R4 — 560 ohms (the former for the astable-flyback transformer combina- tion, the tatter optional for the battery- operated version) R5-R6— 200- and 40-megohm series high-voltage focus divider, RCA SK3868.D1V-1, used for an optional high-voltage range extender for a con- ventional high-impedance (10- megohm) voltmeter (see text) R7 — 2.7 megohms Capacitors C1— 1000 (iF, 25 volts, electrolytic C2— 100 (J.F, 16 volts, electrolytic C3-C8— 0,001 plF, 10 kilovolts, ceramic disc C9— 0.001 P.F, 500 volts, ceramic disc, optional for aluminum can/neon bulb experiment (see text) Semiconductors D1, D2— 1N4004 sil- icon diode D3, D4 — 1N4148 silicon diode D5-D10— RCA SK3067.502 high-voltage diode, 12 kilovolts PIV LED1 — light-emitting diode for the bat- tery-operated version Q1. 02— TIP31B NPH transistor IC1— LM317T adjustable voltage regulator Other components F1 — 0.5-amp slow- blow fuse with holder NE1— 120-volt AC neon-bulb assembly with 47-1 00K built-in series resistor for the plug-in version (Radio Shack 272-712) NE2— neon bulb, type NE2 (not the part number), optional for experiment (see text) S1— SPST toggle switch S2— SPST toggle switch T1 — 18-volt center-tapped transformer (Radio Shack 273-1515) T2— standard TV flyback transformer (see text) Miscellaneous: Plastic case (7.5 x 4.25 x 2.25-inches, Radio Shack 270-224), enamel magnet wire, three- wire line cord, emitter needle (made from either straight pin or sewing nee- die), RTV silicon rubber, heat sinks, four alkaline "D" cells (optional for battery operation), 2-liter plastic soda bottle, and a sewing needle. NOTE: The following are available from Anthony J. Caristi, 69 White Pond Road, Waldwick. NJ 07463: Two etched and drilled PC boards (one each for the main and voitage-tripler sections) for S15.95. IC1 for $3.25, Q1 and Q2 for S2.75 each. Please add $2.00 for postage and handling with each order; NJ residents please add 7% sales tax. INPUT FROM FLYBACK TRANSFORMER (MAIN BODY WINDING CARRIES HVDC) C3 osy. cm 1 V* ir -eooo-c C5 D8 D9 -w- m ° r t cs 07 HVDC OUTPUT 'UT6 FIG. 3— THE PARTS-PLACEMENT di- agram for the high-voltage PC board. The parts shown include high-voltage ceramic disc capacitors C3-C8. and selenium rec- tifiers D5-D10. D5, D7, and D9 go on the component side (solid lines), while D6, D8, and D10 go on the foil side (dashed lines). segments. The AC waveform from the transformer is coupled to D5 and D6 via C3, charged through D5 acting as a clamp. The peak-to-peak magnitude of the AC waveform at the anode of D5 equals that of the flyback transformer output winding, with a negative DC component of half the peak-to-peak value. The AC output waveform from the flyback transformer is coupled to the anode of D7 via C3 and C4, where D7 charges C4. The action is repeated again via D9, which charges C5. The DC potentials on C3-C5 add, tripling the voltage from the flyback transformer winding. The anode of D10 is the output of the negative ion gener- ator, and should be at - 9 to - 14 kilovolts DC. Power is supplied by either a standard full-wave rectifier fol- lowed by variable voltage reg- ulator IC1, or four series "D" cells producing 6 volts DC. Although SI, S2, Fl, and NE1 are shown in Fig. 1, they were omitted in the prototype. IC1 controls the DC voltage fed to the oscillator via Rl. Since the negative ion gener- ator output must be -9 to - 14 kilovolts, and the exact flyback transformer turns ratio is nor- mally unknown, adjusting Rl is mandatory. Once Rl is set, the negative ion generator output voltage will be stable. Vj-inch OPENING FOR CORK FLYBACK OUTPUT (RUBBER TEST LEAD) FINAL HVDC TRIPLER OUTPUT (RUBBER TEST LEAD) FIG. 4— THE NEGATIVE ION GENERATOR, showing the case, T2, plastic soda bottle, and the top of the high-voltage PC board, with D5, D7, D9, and C3-C8. Both the plastic soda bottle and high-voltage PC board are held in place with RTV. The neck is sealed with casting resin to within Vi-inch of the top; cover the needle with a cork when unused. 2 C I Construction Next, we'll discuss con- struction, focusing on the main and voltage-tripler PC boards, the plastic cover for the voltage- tripler PC board made from the top third of a 2-liter plastic soda bottle, the emitter needle, and the cutout in the lid of the plastic case for the flyback transformer. Figure 2 shows the parts-place- ment diagram for the main PC board, and Fig. 3 the ladder volt- age-tripler section. Remember to add SI, S2, Fl, and NE1 off the main PC board, as shown in Fig. 1, if you want them. The main section includes the regulated supply, oscillator, and llyback transformer, and goes on the single-sided PC board men- tioned in the parts list, with the foil pattern shown here. The high -voltage PC board contains the ladder voltage tripler, con- nected to the main PC board by two leads, and the emitter needle is above the high-voltage PC board. In Fig. 2, Ql, Q2, and 1C1 need heafsinks; you can buy them, or make them from lxl- inch copper bent in a "U," with silicone grease for heat transfer. The heat sinks go on top of the PC board without insulators. Neon lamp assembly NE1 acts as an indicator, and has a 47K-100K resistor in series with it. For battery operation, use LED1 in series with R4; use al- kaline batteries, not carbon-zinc. Use a 3-wire cord with ground, or an earth ground in battery-oper- ated versions. The voltage-tripler section is built to avoid arcing and shock. Cut the top third off a 2-liter plastic soda bottle, as shown in the lead photo, or use 4- inch diameter plastic PVC plumbing pipe. Use 18-gauge rubber-coated test leads to connect the high- voltage PC board to both the flyback transformer output and the needle, to withstand high voltage, but not until indicated (more below). The heavy voltage- tripler output lead is soldered to the emitter needle, which goes upward through the plastic soda g bottle and projects out of the rx neck, which is filled with casting o resin. Don't fill the neck with res- 3 in all the way to the top; leave 'A £ inch of the neck open, so you can 5 cap the needle with a wine bottle S cork when not in use. to FINAL HVDC OUTPUT UNDERSIDE OF VOLTAGE-TRIPLER PC BOARD GND WIRE FIG. 5— THE BOTTOM OF THE HIGH-VOLTAGE PC board, showing D6, D8, and D10, and the attachment points of the ground lead and both high-voltage leads. The voltage tripler shown in Fig. 3 consists of ceramic disc ca- pacitors C3— C8. and high- volt- age selenium rectifiers D5-DI0. Note that D5, D7, and D9 go on the component side of the PC board, while D6. D8, and D10 go on the foil side. They're common to most TV's, so most TV repair shops should stock them; see the parts list. Figure 4 shows a photo of the negative ion generator, with the closed case, flyback transformer, plastic soda bottle, and top of the high-voltage PC board showing D5, D7, D9, and C3-C8. The high-voltage PC board is held in place inside the plastic soda bot- tle top using RTV silicone rubber, and the plastic soda bottle goes on the top of the case the same way, for a water-tight seal that avoids condensation, and has good high -voltage attributes. The markings and sizes of the high-voltage TV diodes used in the voltage tripler differ from those on standard diodes. They're much larger, and have a very high peak-inverse voltage {PIV) rating. Also, on a conven- tional diode, the cathode is nor- mally marked with a band, whether a white band on a black body for such low-voltage rec- tifiers as the 1N4001, or a red band on a clear glass body, as with the 1N4148 or 1N914. In high-voltage TV diodes, the body* is generally either white, black, or see- through. In Fig, 4, D5 and D7 are white with a band of black " + " signs on the right end, while D9 is black with a dashed band of white "-" signs on the right end. The ends with the bands are the cathodes, for both diode body types; the reason for the " -I- " signs on D3 and D5 is that circuit power is normally considered as being extracted from the cathode ends in TV, and is called B + . In Fig. 5, D6, D8, and D10 all have bands of " + " signs on the cathodes. A 3 x 3-inch hole was made in the case top for the flyback trans- former: adjust yours as needed. Don't connect the voltage-tripler PC board to the main PC board until the final checkout below; put it aside and let the RTV dry overnight. The soda bottle and the high-voltage PC board are held in place using RTV The rub- ber-coated test leads connect the flyback-transformer output to the voltage tripler and the voltage tripler to the emitter needle; the thin wire is the ground. A flyback transformer is also called a tuned transformer, and consists of a ferrite core sur- rounded by a metal bracket, with a large coil of windings coated in plastic or ceramic with an exfremeiy high dielectric break- down voltage. Often, as with the flyback transformer used in the prototype, there are additional low-voltage output winding taps (seven, in that case) placed around a plastic ring on one side of the transformer coil, that have equally high-voltage breakdown characteristics. That's all we have room for. Next month we'll finish up this project. R-E 44 BATTERIES ARE BECOMING A BIGGER part of all our lives, and many innovative new products coming to market either use or contain them. Battery-powered products are no longer limited to just toys and handheld vacuums. Serious products — like handheld trans- ceivers, portable scopes, or lap- top computers — are often bat- tery-operated. However, while batteries provide mobility, they're also often the culprits when a product fails. Many of us still consider bat- teries to be the ultimate black boxes: mysterious devices that work only when they feel like it. However, they're really not that difficult to understand and use effectively. Here are some ques- tions and answers to help you create better designs using them. • I know there are many kinds of batteries. What's the best type for my application? Choosing a battery type means knowing something about both batteries and how they'll be used in your equipment. Batteries are commonly classed as either pri- mary or secondary. Primary cells include the disposable varieties such as carbon-zinc, alkaline, and lithium cells that can't be re- charged. Secondary cells include the va- rieties based on either nickel- cadmium (Ni-Cd) or lead-acid cell chemistries, that are rechargea- ble several times without 'degra- dation. So first, consider your equipment. Specific questions include: What is the drain rate? How often will the equipment be used? And, finally. Is recharging feasible? Low current drain, short duty cycles, and remote operation favor the use of primary batteries for watches, hearing aids, garage door openers, and retrofit smoke detectors. Obviously, the applica- tion parameters for secondary batteries are basically the op- posite of those for primary cells. In applications involving high current drain or extended usage, the cost of replacement of dis- posable batteries may be pro- hibitive. Such applications are logical for rechargeable second- ary batteries as long as recharg- ing power can be provided. • Based on drain rate and duty cycle, my application could go either way. What are the perfor- mance differences among vari- ous battery types? Table 1 provides a comparison of various common battery types, both primary and secondary. The first point of interest is the nomi- nal cell voltage; more sophisti- cated concepts like energy densi- ty will be covered later. Also, all batteries have one or more cells, operating at voltages fixed by the electrochemistry of a given cell. Note that the operating voltages are shown as decreasing in Table 1; the initial value refers to the fully charged state, while the final value refers to the end of run- time, or useful life. BATTERY TECHNOLOGY Here are some important Q&A's about batteries to enable you to use them more effectively. MARK DEWEY Characteristic TABLE 1— CHARACTERISTICS OF C( Primary Cells )MMON BATTERY TYPES Secondary Cells Carbon-Zinc (LeClanche) Alkaline Lead-acid (sealed (SLA), wound, gel.) Ni-Cd (sealed, wound) Chemistry: Anode Zn Zn Pb Cd Cathode Mn0 2 Mn0 2 Pb0 2 NiOOH Electrolyte (all aqueous solutions) NH 4 CI and ZnCI 2 KOH H 2 S0 4 KOH Cell voltage: Nominal 1.5 1.5 2.0 1.2 Open-circuit 1.5-1.75 1.5 2.1 1.25 "Operating 1.25-1.15 1.25-1.15 2.0-1.5 1 .25-1 .00 End 0.8 0.9 1.75 0.9 Operating temperature (°C) -5-45 -20-55 -40-55 -40-70 Energy density (2(TC) for cylindrical cells *Wh/kg 85 85 35 30 *Wh/liter 100 220 70 80 Advantages Lowest cost; good for non-critical use under moderate conditions; variety of shapes and sizes; reddily available High capacity compared with zinc-carbon; good low temperature Low cost; readily available; good high- rate, high- and low- temperature operation Sealed, no maintenance; good low temperature and high-rate performance, long cycle life Limitations Low energy density; poor low temp,, high-rate performance Moderate cost Relatively low cycle life; limited energy density; poor charge retention; hydrogen evolution Higher initial cost than lead-acid Major types available Cylindrical bobbin celis to 30 Ah; flat cells Button and cylindrical cells to 20 Ah Prismatic, cylindrical, wound cells, 200-400 Ah Button cells to 0.5 Ah; cylindrical cells to 10 Ah *Wh: Watt-hour. **Values are delibers tely decreasing g z O a: i- o LU o □ < DC The nominal voltages of all cells are fixed by their electrochemis- try (more below}. The two major primary cells, carbon-zinc and al- kaline, both produce 1.5 volts, while lithium versions produce 3.0 volts. The carbon-zinc cell is referred to in Table 1 as a "Le- clanche" cell, named after the French chemist George Leclanche, who discovered it in 1866. Under the Ni-Cd cell list- ings, one of the the cathode mate- rial has the unusual formula of NiOOH, which is nickel oxy-hy- droxide. Of the major secondary ceils, Ni-Cd cells produce 1.2 volts/cell, and lead-acid cells 2.0 volts/cell. Higher voltages, up to 240 volts, are commercially available from series cells. In 12-volt car bat- teries, all cells are connected in- ternally. However, certain cell potentials, like 4 volts, may be possible from one cell type, but not from others. Cell chemistry also causes volt- age "droop" during discharge, which may affect a given applica- tion. While flashlights merely dim as their battery voltage de- creases, many electronic circuits are highly sensitive to even slight drops in input voltage. Figure 1 compares the performance of pri- mary carbon-zinc and alkaline "D" cells with secondary Ni-Cd and sealed-lead cells, for a dis- charge current of 800 milliamps. The carbon-zinc voltage profile falls rapidly with discharge, with a runtime under four hours. The voltage of an alkaline cell also falls off steadily, but its runtime is roughly quadruple that of a carbon-zinc cell. The Ni-Cd cell has a voltage profile that's nearly flat for most of its life, but only half the terminal potential of an alkaline cell. The Ni-Cd cell has a first recharge life that roughly equals the total life of an alkaline cell. The stability of Ni-Cd cells at high current drains is why they're used in portable items; drills can draw up to 30 amps under load. The internal resis- tance of a Ni-Cd cell is 5—15 mil- liohms due to it's construction, making such high current drains possible, A spiral nylon separator 46 3RD CYCLE** en < X g SEALED-LEAD ACID (SLA) NKM ALKALINE CARBON ZINC 5 6 7 TIME (HOURS) ♦Ni-Cd NEEDS RECHARGE BEFORE 2ND CYCLE **SLA CELLS NEED RECHARGE BEFORE 2N0 AND 3RD CYCLES "D"CiLL 800mA DISCHARGE CURRENT FIG. 1— THE VOLTAGE PROFILES OF PRIMARY and secondary D-cells are compared for a discharge current of 800 ml II lamps. The carbon-zinc voltage profile falls rapidly with discharge, with a runtime under four hours. Alkaline performance falls off steadily, but runtime is quadruple that of carbon-zinc. isolating the electrodes goes in a steel can used as the negative ter- minal, and is filled with elec- trolyte that transmits mobile charge. The steel it's sealed in is used as the positive terminal, as shown in Fig. 2. Whereas Ni-Cd cells have a large anode-nylon-cathode sur- face area due to their spiral de- sign, alkaline cells have an annular (or doughnut-shaped) cross section. Powdered anode material fills an inner ring, and compressed cathode material fills an outer ring. They're isolated by a porous fiber separator as shown in Fig. 3, giving a higher internal resistance, and limiting the available current drain. Note that in Fig. 3. the top positive electrode is the cathode, while the bottom negative elec- trode is the anode. At first glance, that might seem odd, since most of us are normally accustomed to the reverse usage encountered with diodes. However, since a battery is an electrolytic (or elec- trochemical) cell, the labels for the terminals of a battery follow chemical, not electrical usage. Earlier, there was a reference to how the electrochemistry of a battery fixes its terminal poten- tial: let's now examine that as- pect in more depth. The chemical process in a battery is an oxida- tion-reduction, also called a "re- RESEALABLE VENT MECHANISM POSITIVE TAB WELDED \T0 POSITIVE TERMINAL NICKEL POSITIVE PLATE NEGATIVE TAB NICKEL-PLATED STEEL CASE CADMIUM NEGATIVE PLATE FIG. 2— NI-CD CELLS EXHIBIT an internal resistance of 5-15 milliohms due to their construction, making stable current drain possible. dox" reaction. The anode is the terminal where material is oxidized, or where electrons are removed from or given up, and is usually called negative or minus (" - "), or where mobile electrons exit into a wire. The cathode is the terminal where material is reduced, or where electrons are accepted, and is usually called positive, plus (" + "), or the terminal where mobile electrons enter from a wire. An electrolyte is the wet (or at least damp) ionic medium, through which mobile free elec- trons released by oxidation at the cathode travel to the anode, to propagate the electrolytic reac- tion of a battery. Table 1 lists the materials used for all three parts of the most common batteries. The term "electrolytic" has the same meaning here that it has for capacitors, with certain varia- tions.. An electrolytic capacitor is polarized like a battery, and may well explode if its DC working voltage (WVDC) is exceeded (es- pecially for reverse polarity}, just as many primary nonrechargea- ble batteries will if recharged. A battery by contrast, is basically a fuel cell, maintaining terminal potential by elec- trochemical means until its fuel is exhausted. That is, the very se- lection of electrode metals and electrolyte is what determines the terminal potential of a battery, and a battery thus supplies charge without having to be charged initially. All an electrolytic capacitor can do is store a charge fed into it, and dissipate the charge by gen- erating an exponential current into a resistance. It stores charge (whereas a battery generates it spontaneously), and its potential decays exponentially, just as with any other capacitor. However, the electrolytic medium used allows the packaging of larger capaci- tance values than would other- wise be possible for a given volume. Nonetheless, batteries and electrolytic capacitors are at least second (or maybe even first) cousins. • What are cell capacity ratings 2 based on? > Battery manufacturers rate cell 2 capacities in amp-hours (Ah), a 5 unit of charge, not energy. A 1- - o z o cr H o LU _l LU 6 o < EC INSULATING WASHER ATHOD OUTER STEEL JACKET SEFARATOR -ANODE POTASSIUM , HYDROXIDE ;;3Felectrolyte * | _^ CATHODE CATHODE COLLECTOR IT ir ANODE COLLECTOR ANODE CAP PLASTIC SLEEVE PLASTIC GROMMET VENT INSULATOR I FIG. 3— THIS IS A CROSS section of an alkaline cell showing its annular con- struction. amp current corresponds to the motion of 1 coulomb (C) of charge past a given point in 1 second (s), or 1 amp = l C/s, where. 1 C = 6.25x10 18 electrons/s. The individual electron is often denoted by the variable err, so the above relation would appear as 1 C = 6.25xi0 18 e-. The metric unit of charge is the coulomb, while that of energy is the joule (J). The potential energy (or potential work) W contained in a battery is related to its total available charge q and terminal voltage V by W=qxV. The variable W is used for ener- gy to avoid confusion with E and V, normally reserved for voltage, although many texts use E for total energy (kinetic and poten- tial) and V for potential energy as well, so you should know the con- text to avoid confusion. Thus, an "AA" Ni-Cd cell that can maintain a 0.6-amp load for one hour is said to contain q = 0.6Ah, = (0.6)x / B.25 X 10» er \ /1C\ f 36008 yihrt of available charge. Such a cell has a terminal potential of v = 1.2 volts, so the total energy nominally available from it is W = q x V = 0.6 Cx1.2 votts = 0.72 J. As discussed earlier. Table 1 mentions the concept of energy density of cylindrical batteries, and uses another energy unit called the unit watt-hour (Wh), used with the electric meter on most houses. Electric utilities measure energy in watt-hours, not joules, since the numbers are more convenient. The watt (W) is a unit of power, not energy, defined as 1 W=U/s. The variable for power is P; if P>0W, then P normally refers to power expended or dissipated, like the loss from a resistor. Whereas, if P<0W, the reverse is normally true, that power is being supplied, rather then expended. Thus, a watt- hour is equivalent to 1 Wh m = 3600J, 3600s V1 hr) hr ; = 1.35x10 22 e- ^2160 C There are two energy density val- ues per cell in Table 1 , one relative to mass, and the other to volume. Thus, for the carbon-zinc cell, for the value relative to mass 65Wh = / 65Wh \ / 3600 J N kg \ kg ){ Wh j = 2.34x1Q5J kg A similar argument follows for energy density relative to volume. However, the same cell, if providing less current, can pro- vide more useful energy, since there's then less internal battery heat loss. If the same "AA" cell were discharged over five hours, it could sustain a 130-milliamp load, for an observed capacity of q = 650 milli-Ah. Cells are generally marketed using five-hour ratings, but any comparison of cells from dif- ferent manufacUirers should use equivalent ratings. Battery manufacturers define Cas rated capacity: the italics are used to avoid confusion with the coulomb. Charge and discharge currents are then discussed as multiples or fractions of C. The advantage is that we can discuss battery currents, not cell sizes or ratings; C for many manufac- turers is based on a one-hour in- terval. Thus, an "AA" Ni-Cd cell has a rated capacity of C= 600 milli-Ah. For example, under that conven- tion, we could write or, 2xC=I.2Ah. CY10 hours = 60 milliamps. Ni-Cd cells are recharged by ap- plying DC opposite to that generated during discharge, whether pure, half-, or full-wave rectified. Minimum commercial recharge rates used are about C/20, or taking 20 hours to re- charge to rated capacity. But since charging isn't 100% effi- cient, especially when it's so slow, some 36—48 hours would real- istically be needed. • Is there a danger of over- charging a Ni-Cd battery? Recharging efficiency de- creases as it nears completion. The final few percent is returned as the cell approaches "over- charge," where Ni-Cd cells gener- ate gaseous oxygen (0 2 ). At low recharge currents, continuous overcharge isn't damaging, since the eel! electrochemically recom- bines the total oxygen volume, letting Ni-Cd cells be totally sealed. For safety, venting is designed into the cell cover. If overcharged at current above a recommended limit, the oxygen is expelled via such a vent, which then reseals. Repeated venting does dry out water from the electrolyte, caus- ing damage manifested as de- creased lifetime for a given load. Also distinguishing primary cells from Ni-Cd cells is the prop- erty of charge retention. Alkaline cells can maintain full charge in ambient environments for up to four years, especially if they're re- frigerated, whereas most Ni-Cd cells will lose some 1—2% of their rated capacity per day. That's why many commercial Ni-Cd cell ap- plications use trickle charging (as low 0.02C) when the battery reaches an overcharge condition. 48 • I've heard a great deal about charge rates, especially "quick" and "fast" charging. What's the distinction? Battery manufacturers have met market demands for cells with faster recharge rates. "Stan- dard" charging is at a rate of 0.1 C. or 16-20 hours. "Quick" charging is at a rate of 0.33 C, or 4—5 hours. Cells are available that can sustain continuous overcharge, with 100% oxygen recombination, at up to 0.33C, eliminating the need for trickle charging. "Fast" charging has be- come the industry standard, being a rate of 1.0C or higher, up to 2C—4C; recharge shutoff is done to prevent oxygen venting, even though it does no damage, • Explain how cells are config- ured to make batteries. Don't I need certain additional knowl- edge about performance? Assembling cells into batteries can appear, at least superficially, to be a rather trite exercise. How- ever, knowing correct cell perfor- mance doesn't necessarily guar- antee uniform, successful bat- tery performance. Experienced product designers and hobbyists alike are aware that battery as- sembly can involve some impor- tant concerns, not the least of which is cell reversal. Ni-Cd cells are typically series-connected for higher voltage, and capacity is achieved using cells of adequate size. Ni-Cd cells are typically con- nected in series for batteries. Runtime, or capacity, is met by using cells of sufficient size to meet the requirement. Cells of even the same size and manufac- ture lot can exhibit actual capaci- ties that vary up to 8% of a mean. In multicell batteries, such vari- ances can cause some cells to give up the last of their usable capaci- ty, while others are still viable. If the extent of discharge is deep enough to bring one or more cells to zero voltage, cell reversal can occur. • Explain cell reversal. The voltage of a cell is the stored potential or electromotive force (EMF) capable of driving current through a circuit. When a cell is reversed, its energy is ex- pended to the point where any further current drain is into the cell, such that the circuit drives the cell, instead of the reverse, as shown in Fig. 4. During reversal, cell voltage can go as low as - 1.4 volts, generating gaseous hydro- gen (H 2 ), which doesn't recom- bine and has to be vented. The solution to cell reversal is to understand and design for ap- plications where cells have the potential for repeated reversal. Product designers can choose to use a cutoff circuit to terminate discharge based on battery volt- age, to prevent cell reversal. Motorized products draw high current, so when their perfor- mance decays before the onset of reversal, they should be shut off. Modern Ni-Cd cells are more tol- erant of cell reversal. Modern Ni- Cd cells repeatedly tested to 40% reversal at 10C have suffered no degradation. Finally, if all Ni-Cd cells in a bat- tery pack are overcharged, rever- sal is less likely since they all begin to discharge from the same + 1.4 ONE ELECTRODE REVERSED BOTH ELECTRODES CELL CAPACITY \ / REVERSED [—DISCHARGE FIG. 4— IN CELL REVERSAL, the stored energy of a cell is expended to the point where the circuit drives the cell, i n stead of the reverse. point. Building batteries from cells of equal capacities reduces the effect of individual cell varia- tion at the end of discharge, and minimizes the chance of rever- sal. • Memory continues to be a much-discussed problem ir Ni- Cd batteries. How is memory avoided? No discussion of Ni-Cd cells would be complete without men- tioning the "memory" effect. The term memory was coined in the early 1960s during early NASA satellite flights. Satellite batteries have strict discharge/recharge regimes and receive very little overcharge. Such precise re- gimes were the result of NASA computer-controlled energy management, and are seldom duplicated commercially. DISCHARGED CAPACITY FIG. 5— IN NI-CD "MEMORY," eel Is repeat- edly discharged only partially to the same extent, and then recharged soon won't discharge beyond the "memorized" level. If Ni-Cd cells are repeatedly dis- charged only partially to the same extent (or thereabouts) and then fully recharged, they reach a point where they won't discharge further than the "memorized" lo- cation in their discharge profile. Today, the term "memory" is a misnomer, since it's now applied to a much wider range of similar problems. Voltage depression and poor capacity are two common exam- ples, often mistaken for memory, manifested as shortened run- time, as shown in Fig, 5. Devices frequently won't operate at volt- ages below a specific design val- ue, or will exhibit reduced performance, at best, Causes in- clude low recharging, excess re- charge current, excess battery heat during recharge, improper recharge termination voltage, or wear out. During standard or quick re- charging, Ni-Cd cells need some overcharging, since recharging isn't 100% efficient. If they 're not fully recharged, they can't deliver their rated capacity. Excessive overcharge currents can cause overheating in Ni-Cd battery packs. In overcharge, the energy provided to the battery is pre- dominantly converted to heat, since the chemical conversions are complete, or nearly so. Such overcharging accelerates wearout or causes voltage depres- sion or poor capacity, although improved Ni-Cd cell designs have lower sensitivity. Such improve- ments, along with careful ap- plication, insure long life. • Does the electrolyte in a Ni- Cd cell ever leak? Ni-Cd cells can undergo stor- ^ age leakage, especially in radio z applications, if left on. However, > even if turned off, solid-state < power supplies often allow leak- £> continued on page 83 - 49 PUTTING A NEW SCOPE TO WORK 7b get the most out of a new digital scope, you have to understand how it works, from the inside out . IF YOU'RE THINKING ABOUT BUYING A new oscilloscope, or your boss is putting a new one on your bench, you may be in for a surprise. Many of todays new scopes are vastly different from those of only a few years ago. That applies not Ljust to exotic, state-of-the-art scopes, but also to low-cost, basic scope types. Becoming familiar with some key concepts behind ROBERT W. RAMIREZ the new scopes will give you a head start into understanding how these useful testing devices work. Oscilloscopes of today typically have far more features, yet cost about the same as— or even less than— yesterdays scopes. While they may have the same basic controls, and appear similar, they handle signals differently. and measurement techniques have changed dramatically. In some cases, a new scope can even be a PC board that plugs into a personal computer or a logic ana- lyzer. Yesterdays exotic features have become todays norm. Lets start off by looking at some of the changes that have occurred in traditional analog scopes. Scopes going digital Its rare today to find a garden- variety analog scope that doesn't use some form of digital circuitry. Some things are easier and less expensive to implement digitally. In fact, most control functions in any scope are more effectively ac- complished digitally. The only analog devices in some tradi- tional scopes may be the actual test probes, amplifiers, and CRT. The usual fron t-panel controls and buttons still are present in newer scopes, and operate in much the same way as in older scopes. The main difference is that they're digitally imple- mented, with a microprocessor or two keeping track of things. Some newer scopes have banks of push buttons for selecting ver- tical (volts per division) and hori- zontal (seconds per division) scaling of waveform displays. 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IC as IfaLTd n GST aid AFRLTundtngh; Less lhan 1 yv sinsjtivily varatlor ■TJiKlt lulled 250 ntw aurtiQ c-jlgu" Rum DnSVOC n*i RF gjjin conlrol Thiikil n very easy to Cuiifl. loll or run and edge ai-ona. --Aral lor Ihe Cjerjinnei c trie Did pip T he oplional malclunfl, cm hd Itaeures ii rugged ABS rjiasnt case vfiie serened ijfjpii-ici Included ire rroacnined jiiimmufTi kn&bs I'd* a *eM"HSntd pr r>1»i5-piji loc* :':■« if. igurn town ;'■*' *24.95 SK5 *24.95 ™ *24.95 M2.95 QRP TRANSMITTER KITS, 20, 40 & 80 METERS Opn a"e 1 mini nam snack THEse Mile CW figs are >-dea< males loour 40 ann] W mele 1 ■-* f ft .*** 1 1 FealureS'ncludBsiMjflin va^alue lulling, une wailgutpul anil excellent key i-ng EharaderrsUcs Hurts fln 12 VDC and is vSWR P'ottc led See hp* Fa' P pu car ^1 retch your signal with wt fll [ties* rttuni rigs CpVcnai ABS caies J. c available 2D y Tfl 40MTA tfHITft Case iws *29.95 «?-« ^29.^ mp* *29.95 ta»p * 12.95 AIRCRAFT RECEIVER KIT Hear tuning mean cemmgnitiinfl.-j- picks ujy planes up lit W Tints away Recnves HO— 136 MHi M 2,1 tjaAU v^iaEEDr lunEd 1-jSChe! dHi^ wdn AGC urarnnc hnei jrrJ ad|u^tatile squelch Runs onSVlHliEiy- 250 mi# igdnoou-'pul 1 mv sensitivity Opiiflial fflaicfinnj AK plastic cajst ids you Law it srvM^he. e lealm a wttnta graphics and matfufieitl alurruinujrn knty\t% lor a 'til ppFtisomi look Compjt t- g'flil ton jir&hows or lor | ail ptam flanging t< c una the aiffflrl RKsmer e*se kit UP ■ s 12.95 SHORTWAVE RECEIVER KIT A tlfttutH: receiver iriai capiu'cs m w j v> i-. |usi a 12' anitvina 1 Receives |IMH*in?MH/L'indS. varatlai tuned sl pti hCl lleSifln wllfl AGC RF gain «!>■ irol aid 250 mw a\Hl>inMj1put Uses new Signeflu mine' iNp Fry lESS IrUh a ffl'trovflU SEhSHiv j|y rL.rssrjnjVballery T h is is i t i.Utf\m >nq scdu: scrtforor clubpcfljid ind wiUptSMiflt hctjts ipl Cirfi even m the itid;1 serous DK H Asd 'he apiianal case k.i and yc j nave a real rude looking PACKET RADIO Comnodort C6*.' SS MCHf/l ratHO mltrlijce Uie.s tjmogi German D' Jtom w11*arej Featuf«, EXAn ICcthp sf 1 1or reliable opcislHjn-ignsHFortfMFlones tncJvt!«FR£E fliSiSOSfurjiE PC Doaf-d all nEteiiiiy part? anrj tif II docvmenralion c ja a«- CDnp'ElelM TC-i *49-!J0 FM COMMUNICATIONS/ 2 MTR, 10 MTR & 220 RECEIVERS Sensjtive jupe-imd FH wttve* Unes ar.y 5 MHz HfiimnE or band Lrlttn 10 mm flptf ivHtl, it-jh band pgttce caJts. *w(her or motn*! phone caRV Etiy to bu*kJ rearm !ejtui» varKtoi tuning, c n-nier sc>Qf. oennkrc IF fllteryvtd dmi convernon design wilh idjuitabM tquttli. Lks Eha n 1 in/ vensiKwily, runs, on 9 V Haftery. * ith 50 rnw audio outjHJt Oplwul ABS tin wilh icrevHKl nritptufS and machintd ahjmi mjm knofis p*QY»dt I IUC9 JKOIKinniil took 2MTR WM1R ZZDHKi heww S, (2935 S.» *29^5 Sa ( 29l96 ™" *12.95 NEW MINIKiTS-NEW MINIKITS BROADBAND PREAMP A S!Ji iM i« all pur poi( D'tan-.p idtallor scanintrs iv sets VKF UHF i ig' 3 cEHrnieTi eLC FeaiureslOwnoisE l&b NfKJdbgjn WQ KHi-IGMioperaiHofl Rurra,iin»-nVDC SO OrnTi mpfjl kn SA7 *l'tM» LIGHT BEAM COMMUNICATORS Transmits, rr.&d u 'aleJ inrrartd light tiHa 30 led vnthout lenw j.T'O ■■■■4iT>l« jLing er^t-i Dies 3D K.H/ C3' ner Ipr Hum -«re« ppe ra- I«dp I'ansnMtunrg Aindpwi (1c idEJi lui' tKigi D' iislemng tp IR i ei^pre ■cpniroi, Tr ams'ipiilttr has Mnnti.e mike rpi,i recfivff usei PhV ictz !■?■ aru! drives swaki* pgtpejl Uftils operates on Ti-ansmiTler LB4 *8.95 ^95 HIGH POWER FM WIRELESS MIKE A high power urn 1 1nal will ■ransml up lo 1.'? -T.ile tpany FM broadtail >a4io Stnultvi npur accepts any if oc o1 nuke wrllfHck up normal mices 10 1eet: away using Hit available mtni-eleelric nuke caJtridge Dptrateign 5- H VDC BHM *12.95 *2.95 mkcroohone ca-iiidgt S6995 $8995 The ^ ; as hrtdv f c- Ti>gn resottilton audio resolulitn TieaiLrernents. rnruJEipiHUponirtqiiiricv »fjrEatfo: PLIone-'Wan.irjnxMS, * nMiltiplts by *5 or 100 • 01 hi tasoiuiion & bull-Mr SiflUl orennpJ COndiEianer PS-1QB 1.5 GHz PRESCALER E utencs Etw nno* Pi youJ' prewnl cwnier To- 1 5 G«i • 7 sTapj preamp • divide if VXtt ciieu itry » super sensnnrei5Q rnVryprcan • tXC CCHinectors • 1 5 Gni in. 1 5 MHf oul • drives any counter „ THE COMMUNICATIONS $2795°° SERVICE M0NIT0RTHAT m. w ***# WQRKS HARDER F0R L£SS I nti od ucmg COM -3 . . . the new snvice raon Ho r designed by serv ice technicians for service technicians II works harder lor less . . giv- ing you advanced lesung capabilities at a very affordable price. FEATURES • Direct entry keyboatd wiltt programmable memory • Audro 1. transmitter frequency counter • LEO bar graph ire- quency /error deviation display • t-1O.00O(iv oulput levels * H[ghreceivesensitivity,les$lnan5(jv»100KHjio999 TO5 M H i Conlinuous frequency coverage • Transmit protection, up to 100 waits • CTS lone encoder 1 KHz and external modulation MINI KITS-EASY TO ASSEMBLE- FUN TO USE IMtMCWlJt AcOT.p^Jj tonedet«ier pnaaVinglePCboard Ftaiures ■400-MCK HiadiusTabierangevia^Oiifrnogi voli- agereguialitjn.SrfinC Useful lanouch- n:ip!"L--.1::flri..i ;-i FSK.ctt LJt.ii'..j peused as aslableioneentade' Runs pn5loT2volEs tompieiekn iu-i S5.95 40 WAIT 2 ml r FWRAMF Si — p-t Class C powej amp features S i :rte s powtr g a. r I W m Tfl; I out. 2 W ir. Tor lSaul tWininsiOrtDLl MaxOuliHil 01 M W. incredible value camplelewill j"cj-is less cast aitdi-fl'elay PA-l.«Wpwramphil $27.95 Tfl 1 RFs-ensed VR relay kn Q»95 SLEUTH A super sensrtive ampfl ■ li*i #nrliw.'lfty lPJ PMidiropaEl^feei'&eai 1or monitonnq batvy i room or as genEra'pur pose impnlrer FullTW rrrsouEpul liirtsonEIra 6 rolls, uses M5Wm SfteaftFi SN-9K.I S5»95 BO Hz IIMEIA.XE Runs on 5-15 VOC Low current C!5ma| 1 Tini'Tann ncturacy iB-rjKir $5.50 TB-EftMy S9.95 Set music tome alive* 3 dil1*yehtl«gli!5 flicker ffilnmuiic Onelrghi eatlvfo- Nttt» mif-iange andHflwi E at " mt iviqi; ally adimtarjie and di-veiL'piDiMO w runi QnlKiVAC MLIKil S8.95 toici AcrnmTi o SWIfCM vg*te activaied iwntn kit provides switched 0u1pur!*iChcurrEntca' pabriityuptovOOmji. CandrrvETElayS iTjnU LED or even a tape recorder mole Runson 9VDC VS. 1 KIT SS.95 ^«C^ TELEPHONE TRANSMITTER Low cost with proles- SiiJnil perfcrmantc Fea- TiKtS memde tell phor* imepo#enaH( from 761ft 100 MrU polarnyariEiseF.S'iKE compacisifei "»V+*) easily installs artywher« Oh Jhe panne ImsCr insuSb1fltinslrumenl LlS.CH PtVlKST $14.05 tonverteany TV la vsdeo monilor Super ^^ acctptssid vidtosignal BesmmiotnlriJE marten CfWrtplrlt kit M-? LEDUHKTKIT Aliernaiery Hashes? lumijatETis UsOlor name Ixadges butions 1 ' wanting panel lights Puraanaitj tSvottS bl-iKii S3. 95 Ptovides Ihe bas.it pa res aridFCboajdreq'jirEdla provide a source olive- tiS'cnhn ngandsj se fl^rwraEiPn Uses 555 flmnerXaivj includes a tangeDr pans Tor ntftsf iimmgrieens ^^. UT-SKn $5,95 FM RECEIVER Fortaiir'inappiicaiiofls ornptbyeipetrimenla- lwn Full liedjed super helrodyne receiver miCfe-vOlEMniiliir.lj 10 J HMilF rtnegiiirt Circuit dElKMH 50 mw audio ant p3ilier.9V eiiernaipoiiver source. E^eral'Dnonsiamfard FMbroadcasl pandas well as (arje jwriipns on each side, compaci 15" squarel iD-rbugdelec- flonorrecEpFion FR-EKII $14.95 RUDiLRATfR RfflduceilOuDearshai- leriigandatlEntiongel I rfjiiit.'iliktiOund Can iuppivupliMbwa^sci otmoaioirt audio Runs 6H6-15VTX MR-lKit $4.95 ILJ6HT An infer«(trtgkri. small nuke picks up sounds arm converts irw.m to 1 3 m TnetfludirEhe sounHf.ihatMighlerifle I !]fl! lit Ld(iT:kr Ltir- trolSUPEOJWW runs on »0 VAC e TransmilsupEo^rJlg airy FM broadcast ikfrp usesaPiyEyfleorrrnke Ru1son3to9VTypeFM- JhasarfdedsEnsrlive rfliSie prfamp stags- FU-1 K-l S5.95 S7.95 Products upward and dovmwarrjwaii ^w peak auoiPoufouE. rum onS'H'vPlis uses3"(a oHmspeakei Cornahelekn.SM-] $3.95 Asuper mgh perlormsmce F M*.re ESi-TikEf -i' iransmrts a scaNe signal up 103QD yards wdn eicepl- anal aul!

.i i leaiures lull ■% p t* opvaltpn UJtng freqirency inver- sion ftunsonaSvaiE battery Fioth mike and line or speaker ouEptrtr 1 inputs E»y to connect lo any radrO-leiephone use requires no direcE connecirfln'EaiylD Bui'd jsesiCDSMci'' cuaEry Can also be used [Ddescrambicmosl com scramblers CotnpiBla twl nc fc.r ss-7 *Z9.95 CasefcrL CS57 CT-70 7 DIGIT 525 MHz CT-90 9 DIGIT 600 MHz M38L85 : CT-SO 8 DIGIT 600 MHz S 169.95 Umm CT-12S 9 DIGIT 1.2 GHz FREQUENCY COUNTERS ■tamSFy Electronic! tiar. twin rtianulactuTingelKlionu: test gear 1or Sv*r IDyiaTS aiVl rs reconnect Idh its laboualdy products al break- nrflugh prices AW pr Due CpmUm carry a lull tAt y?|r warranty cr parti and fatrar VVela-.E ;.tal p-it:ir cemg ihela-ge-.l xgnjlac- burgr Ql I'ja cos: cauhlerSinlht-ctilitE USA Compare ipto I -cations Our counters a re lull lealurefl from luPip tfl EJHF wtlli FEJhucjh ■ t ;; i 3'i:» inpul p ■ z ■&. r wave Stiipnng tirCuilry and durable Tugn riuatity eppjty glass. platerJ-lfl'u PC Boa'iJ cpn-stru-chpn All units are W, fT anu'a : ' l ■ tc in the USA ACCESSORIES FOR COUNTERS M89.95 fflSB reksuinc whip mmim- BNC plug It^tt impedance probe lighi loading Low pail probe, audio use Di red probe general purpose uie . . TiiiMiLtorCT.ra.sot a NicMHSkW CT-70. SO 11» liSri use <5tHmrTo6l)Hlli < Ml la KO MM; ctswmibnoMiiz LSSSTH*H»n™ <25m»*i(>MHe Bl 4 I -rur pjrUl ElIV wjr rMf m HL wind unfU SHr 716-924-4560 "*«■*- FAX 716-924-4555 RAMSEY ELECTRONICS, INC. 793 Canning Parkway, Victor, NV 14564 CIRCLE 291 ON FREE INFORMATION CARD RE-SHOPPER 3 FORDHAM SIGNAL/AUDIO GENERATORS and COUNTERS 1 -* FUNCTION GENERATOR It's versatile and compact - capable of model fg-ms generating hk)h quality sine, triangle, and ourPrtce square waveforms of nigh stability and (HAQ. QA accu racy. The sine and triangle V ™«W waveforms can be amplitude and frequency modulated by applying external voltages at the VCA (Voltage Controlled Amplitude) and the VCF (Voltage Controlled Frequency) inputs. With these two inputs, the unit can easily produce amplitude modulated, frequency, sweep ASK (Amplitude Shifl Keying) or FSK (Frequency-Shift Keying) signal. Frequency Range: 05 Hz to 500KHz (6 ranges). SWEEP FUNCTION GENERATOR Output; Square wave, triangle wave, or sine mooelfg-wi wave (selectable). Also TTL pulse, sweep our m» output. Input: Voltage controlled frequency f ft 4 ft ft C (VCF). Frequency Range: 0.2Hz to 2MHz 3fcl3t33 (7 ranges). Frequency Accuracy; +5% of length scale. Frequency Multiplier: 0.2 to 2 .0. VCF Range: 100: min. for Olo + 10 V input. Sweep Characteristics: Internal: Linear. Sweep Rate: Of Hz (2 SEC period) to 50Hz (20mSEC period), continuously variable. RF SIGNAL GENERATOR • Wide frequency range: 100KHz-150MHz Mooaswsfl • Portable, h^h stability • With 1KHz our jftc oscillator in inner part for the purpose of SH1J QC modulation. Description: Here is a V I wttvS compact solid state RF signal generator for checking and aligning the IF circuit and tuners in AM, FM and TV sets. AUDIO GENERATOR • High frequency stability: within +2 Hz MODEL AG-260 ■ Output wlter^ floating: within ± 1 dB *"™» • Sine square wave output: » SVms. Clld Cfi Description: A portabte Aud io Generator v ' **™ 3 with 600 2 input impedance, all band voltage floating ±d& low distortion output wave from 0,05%, high output vollage, stable oscillation circuit loop and minimum frequency float- ing. The oscillation frequency range of the AG-260 is usually between voice and super voice frequency bands. Its main function is to measure the characteristics of an audto circuit. Frequency Range: 10Hz-1MHz 5 decade bands. LCR BRIDGE METER A fulry transistorized AC bridge meter, which MODaLCUo allows for accurate measu rement of our prk« resistances, capacities, i nd uctances and dj i i A A E the turns ratio of transformers. This unit is yl Tvi* battery operated, small and handy, and has high mechanical and electrical stability. Besides the actual bridge circuit a 1KH: generator and a three-stage test-amplifier is inserted. FREQUENCY COUNTER Frequency Range: 10Hz-15OMHz. Gate model fc-iw Time: 1 Sec, 5 Sec Accuracy: ±1 Count. ourPi*» Max , Input: 20 V pp. Voltage Sensitivity: C 4 1 Q Q A 25mV-100rrW, 10Hz-30MHz; 100rrW-30urrfV, * Iw^W 10MHz-15QMHz. Multiplication: HF and VHF. Imput Impedance: HF-1MQ, VHF-502. Max. Input Voltage: <3V effective. Reference Time Frequency: 2300MHz. 100KHM50MHZ SIGNAL GEN./ COUNTER OSCILLATOR SECTION: Frequency Mooa SG4M Range: A 100KHz-320KHz, B 300KHz- our ohm 1100KHZ, C 1MHz-33MHz, D 3.0MHz- 11MHz, E IOMHz-35 MHz, F 32MHz- 150MHz, (up to 450MHz on 3'th harmonics). Frequency Accuracy; by counter section accuracy. COUNTER SECTION: Frequency Range: 10Hz-150MHz HF 10Hz-10MHz VHF 10MHz-150MHz. Accuracy: ±1 Count, ± Reference time Accuracy. $27540 10Hz-1MHz/AUD!O GEN./ COUNTER OSC I L L ATO R SECTI N : F req uen cy model ac-2 as Ran ge: 10 Hz-1 MHz 5 decade bands, our prk# Accuracy: with Counter Section Accuracy. (47C Art Output Impedance: 6002, unbalance. ¥" ' 3wV Output Control: 0dB/-20dB/-40dB and Fine adjuster. Sine Wave Output: Range: 10Hz-20KHz. Output Voltage: 8 Vrms, max. COUNTER SECTION: Frequency Range: tOHMSOMHz HF 10Hz-10MHz VHF 10MHz-150MHz. Accuracy: ±1 Count, ± Reference time Accuracy. GLOBAL SPECIALTIES FREQUENCY COUNTER MODEL MAX43G0 Our Prka Description: Can measure any frequency from subsonic through SlyflQ Qh the 1.3GHz ham band. *M«iW • 8 digit LEO display • 5Hz-130QMHz response • Dual gate times • Tilt stand included. Service and Shipping Charge Schedule For Continental U.S.A. ONLY S o $ 26 $51 S101- $ 25 -$450 $ 50-$600 $100 - $750 $200' - $9.00 $201 $301 $401 $501 $ 300-$10.M S 400— $12.00 $ 500 -$14.00 $ 750-$ia00 All prices are subject to change without notice. Mot responsible far typographical errors. $ 750-S1000— S1B.00 S1001-$1250— S20.00 S12E-1 -$1500— S22.00 $1501 -$2000— $2750 $200Uup -$35.00 Ask for FREE CATALOG of over 10,000 items. MONEY ORDERS OR CHECKS ACCEPTED C.O.D.'s require 25% deposit with order. QUANTITY DISCOUNTS AVAILABLE! 4 RE-SHOPPER World's Largest Discount Test Equipment Distributor. FORDHAM POWER SUPPLIES 1 ■^^^^^ EP™ 1 * # - •71 i REGULATED TRIPLE POWER SUPPLY Assembled and tested. . .and it's short circuit proof! Description: Benchtop power supply. Includes fixed 5 V at 1 amp, 5 V to 15 V at 05 amp, and -5 V to ■15 V at 0.5 amp. All supplies regulated, short proof. Each supply has a power on indicator LED. Complete and ready tor use in a durable MODEL FM-6 Our Price $139.95 |8 x 5 x 3 V) metal case. Reg. S179.95 SINGLE OUTPUT/DUAL ANALOG METERS MODEL P 5-393 Our Price $19955 DC Output: 0-30 volts, 0-3 amps. Ripple: (XSmVims. Over load and short circuit protection. Current can be limited from 0-3A. SCOPE DIGITAL MULTI-METERS 3Vz DIGIT LCD METER MINI METER with MAXI SPEC'S • 05% accuracy • DC Voltage • AC Voltage • DC Currenl • Resistance » Diode Test * Battery Test * Battery Life 300 hours • Test Leads Included • Overload Protection: DC 500V, AC 350V, Ohms 250V DC* AC. Ranges: DC Voltage: 200Mv to 1000V. Resistance: 200 Q to 2M Q. DC Current: 200mA to 2A. AC Voltage: 200V & 750V. MODEL OVH-S30 MO Kf\ Our Price SWhldV Deluxe zippend carrying case ... 14.50 HAND HELD 3% DIGIT LCR METER This lightweight, portable meter is for measuring, capacitance, resistance and hductance of components. Ideaiy suited for field service appfcatais. Abo used in development and research applications, Owrioaa Protected Comes with test leads lest clip, battery, spare fuse. Display: 3% Digit LCD. CAPACITAMCE Range: 200pF, 2nF, 20nF. 200nF. ^F, 2 1M, ±5%, ±1 digit. INDUCTANCE Range: 2mH, 20mH, 200mH, 2H, 20H, 2C0H. Accuracy: 2mH-2H, ±3%, 2H-200H, ±5%. Power flequlnements: one W battery. Sim: 69'H x 35'W x 1.6'D. Weight: 138 oz. KOOR lXfl-680 Our Prict $129.95 HAND HELD DIGITAL MULTIMETERS 8 function, 37 ranges incl.: transistor & capacitance measurements. MOORDW&s OurPrict . 11 function, 38 ranges ind,: logic level detector, audible visual continuity, capacitance & conductance measurements. • I0M imput impedance * Overload Protection • Auto decimal LCD readout • Polarity Indication • 300 hr battery life with 9V transistor battery • Low battery indication MODEL DVB-SM Our Price . .... , Model CA-92 Setae Padded Case kx DVM meters. S19S MtKWTL-JIS Transist* and Capacitance tea Leads SS-.W $59,95 $69.95 HITACHI 35 mHz DUAL TRACE OSCILLOSCOPE £6-* _ nOl- Effective Area 8 x 10 div (1 div = 1 cm). Acceleration Potential: 12W. Focus Adjustment automatic. VOlJ° Eirtemat Intensity Hodu tation - Eftectiw Bandwidth: DC to ! MH* Imput Impedance: 47a jlyp). Max. Imput Voltage : fO" 3GV (DC H- AC peak). Vbllage: 5V|>p or rnom. Vertical Deflection Sensitivfty: SmV/ divto SV^div ±3%. lOcalibraledseps. ImV/div to IV I drv. i5% {when using x5 amplrfa ) Uncalibrated continuous ccrtiol between steps I: > 25 (provided with lock positioning). II real Lamp: Front panel lamp indicates the uncalibrated condition. Frequency Bandwidth: DC to 3s MH;. -3d6 (at 8 div) DC io 7 M Hz. -3dB j a; 8 d n) (when using x5 amplifier) . Risetime: 8.8 ns (50 ns for x5 magnification). Signal Delay Li ne: Pemi ts viewing leading edge of displayed waveform . Max. I nput voltage: 500V Pf or 300V p-p (DC + AC peak at l KHz) Imput Coupling: AC, GN0, DC (lever switch). Input Impedance: Direct 1MQ appro*. 30 pF. Operating Modes: CHI, CH2. ALT CHOR ADD. Polarity Switching: CHS only. X-Y Operation: CHI: X-axis, CH2: Y-axis. Sensitivity: 5 mV I div b 5 W div (when using xBmagnifier: 1 mV/s«:o1Vld»(, Phase Orfterence: DC to 50 kHzwthin T. X-axis Bandwidth: DC to 500 kHi, -3da Dynamic Range: 3 div ormwe. CHI Output: PrwxJed to enable frequency measurement using an external frequency counter. Output voltage: 20 mV I div or mem Frequency Bandwidth: 50 Hz to 5 MHz, 1 3 d8. Output Impedance: Approx. 502. Horizontal Deflection Trigger Modes; AUTO, NORM, TV-V, TV-H. Trigger Source: INT (CH1, CH2, V-MODE), LINE, EXT Trigger f^ing: AC. TV Sync Internal: 1 u« or mere (vertical sy^ 5 to 35 MHz. Internal: 1 5 External: SOOmV Auto Low Bandwidth: 25 Hz. Trigger Slope: f External Trigger Input - Input Impedance: Approx. 1M, Approx 30pF. Max . Input Voltage: 300 V (DC + AC peak at t fcHZ). Sweep Time: 0.2 tis I div to 0~2s I div i3% , 1 9 calibrated steps. Uncalibrated continuous control batmen steps 1:> 25 Iprovided with bd-postoning). UncaJ Lamp: Front panel lamp indicates the uncalibrated condition. Sweep Time Magnifier: 10 times l+5«t>). Max. Sweep Time: 20 ns / div. Calibrator Waveform: Approx. 1 kHz squarewave (duly cyde: 48:52 or more). Vbttage: 05 V+3%. Power: AC 100f 120 /220 1 240+ 10% eon nectcx selectable, 50/ 60 Hz Approx. 45W. Size: 12.2'W x 5.1'H x 14.6'D. Weight; 14.3 lbs. Accessories: 2-AT10AK, 15 probes 10:1 1:1. 1-Pcwor Cable, instruction Manual. FREE DVM-630 wiln purchase ot (he V-355 DESCRIPTION; The model V-355 provides an unbeatable combination of lightweight scope and high performance. Its thin, light, compact design features a large 6 inch rectangular, internal graticular CRT, with percent calibrations, autofocus, condition luminalion and photographic beiel. ESS* $598,00 (MO«ES INCLUDED) ORDER BY MAIL: Fordham, 260 Motor Parkway, Hauppauge, NY 11788 • ORDER BY FAX: (516) 435-8079 or 435-2883 ORDER BY "■>* 1 1 PHONE: IOI Free 800-695-4848 RE-SHOPPER S CRESTWOOD PRODUCTS INC. MANUFACTURER, DISTRIBUTOR AND _Qgr, ai.pn noppy Drives wiinoyi special equipmant or sollware - b\HTf3M*f9". PC /XT /AT/ 38*. Apptm. Commodore, Kxypra, Tandy, Epson, Atari, ft, HP, DEC, OlC S23 save ss.ii KW-HR METERS POOR MAN'S SUPER LASER I weapcnstarrjeti ng. precis* anneal alignments., set smo - I graphy signaling and com mo. stroDes. holography. I science projects, ale Includes a lisl or Hot en* of I SOuices for iuby rods and otrier parts $1 4. STOPPING POWER METERS I *l«clrica[ loads can slow down Power -Meter* - tven I slop them . while drawing lull loadtf Also describes I Pot* Meiers. Meier Cre-eo and Overload Otood. JIB. THE I.G. MANUAL GAS FO' ALL! VOICE MAIL BOX HACKING used arvd leeways Lhay are hacke-d Induda^ ASPEN, I MESSAGE CENTER. B1X.EZ, SVDHEY, PHONE MAIL. I AUG. IX, #!t Fascunanna 1 S2S. LIBERATE GAS & WATER DISK DRIVE TUTORIAL i neary. prac'icai tacts on nappy ljrtves.uiJ Formaiimrj. Software Proieclion tot tha systems de- scribed above Invaluable advice and lips on hpw to I COMPUTER PHREAKING CounierMeaiturBrt - includes Disk' mm 2E&K- ol phreski-ng i«iri tries and disk ■protection programs and: the great f : LUSHOT+ Disk*' (Editors Chotc*. PC MAGAZINE} 1 Dozens of Computer Crime and Abuse Methods, and Counter Measures How system;, arc penetrated BBS Advtce, Password Defeats, JOOPhreak- BRAIN VIRUS ANTIDOTE i ne KMfttaiAHi bh*im viHUi piagueo ( universilies and businesses The mildly destructive! ongmaE version is hacked mtu highly virulent ^trams' I BRAIN VIRUS ANTIDOTE consists ot the antidote, f BEYOND VAN ECK PHREAKING ordinary TV 1 Flanges up io I KMi Plans, couniar- meesures Includes legal VanEofc uses Now includes original Top Secral VAN ECK DESIGN!! 1 S'9. VAN ECK SYSTEM jljg ATM Crimes. Abuses, Security, Vukieraibdibes iO> methods descrtoed ■ from Reg E to ciphers Case ■Hi5*x*i Law, CourflermaaSures. detailed SeaumV Check - tisi Iniemal Photosi" ReeenBy, a croc* stole W^r.000 ABSOLUTE SECURITY methods, tips Plus our Invulnerable Cipher Program I |ir COM and lis HAS Source) Plus SI.OOOl CIPHER CONTEST rules wilh Cipnerlejtl P Li^ n ..-.i x ri:*L.+ tin CRYPTANALYSIS TECH. 5 Povrturful Menu-Driven Crypto Programs jm COMand.1 its &AS Source^ to Analyie, Decrypt "Secure" Crpfier- tBxts Examples Recommended in Ihe prestigious 1 COMPUTERS A SECURITY . Manual + Qhk* "' STOCKPRO Unique, Powerful Shrewd. UnconvenltpnaE Common 1 Stock Investment Strategy Created tor NMSU. Basis I SURVIVAL GUNS & AMMO PRINTER/PLOTTER MANUAL I optimum weapons and ammo to pick conversions ot I commonly available semiautos to assault weapons. I silencers, explosive devices, improvised End Times VOICE DISGUISER ETtecltve arjamst snoops usutq voice analyrers. to t:orceal gender tor women tlvmg alone, for electronic games, tor ami ' miruaion systems, lor musical accom - panimenl lor seances, as a garj. as a. doorbell sup s Lijuic . «lc 1 1 S- VOICE 01 SGU I SE PL MODULE tHL VORTEX GENERATOR ROCKETS RED GLARE % beyond modef I rocketry Sc*cialernpha*sofitr*tofiTtu!abon. manulac- - -., gniaq utt*. Types, uescripiions. Specs and TOO* jmeriacesl (Parallel. Serial) Detailed Plans ot X-Swrichers, [ Butlers, and Serial- To- Parallel and Parallel-To-Scnal [ SUPER RE-INKING METHOD He-Ink Ciolh Ribbons 1gr aboul 50 cents and minutes each Plans tor Et Cheapo Motor- Of ^cn He- Inker. CdmmOnly used ink (5 colors) and carrier I described IN, SOFTWARE PROTECTION U-DiCjue syslcm inat?iirjhi> rjit'j-'jj'agc^costfy totTwafei p-racy while not i niertering wilh iegrt archival copiei MO I Lnowri meinod or deteai rvo special equipmenl required f Easy, automatic lo install Can be used wilh any other THE SILKWOOO THE 'GOLDFINGER IcopPEfl, aluminum. Fteiects all 'erromanpiettc I obiecls Simple circuit Plans $14, I SOLD FOfl EOUCATlOHALPUnFOSlS CULT SPECIAL PROJECTS Wo Design, Build Repair, Modify. Maintain* or any Device. System or ProjeCI - CdmpulBTi£ed, Electronic. Elecmcat, Mechanical Optical - many invention prototypes Confidentiality guaranteed Describe and include US' Eee We then p:ovice you TECH. RESEARCH SERVICES Unique SI *K e'eclrontc computer design articles in database accessed by nle, suhted Dicjitsl. irP, bC, analog, hybrid nomograph, software Provide us keys, we return lisiinrj S2S Search 1ee (t-20 keywords' 1 phrases: unrelated lapses OK) Saves you H4D SSS' * Sofl ware Supports PCDOS, MS DOS, PS/2; Mono, Here , COA EGA, VGA. S 2$" 3.S". hard (specity yOuf lloppy anve sizai. CIRCLE 299 ON FREE INFORMATION CARD RE-SHOPPER CIRCLE 270 ON FREE INFORMATION CARD 13406 Saticoy Street North Hollywood, CA 91605-3475 CORP. (Call for free catalog J A.C. POWER SUPPLY STACO MODEL E1010VA This unit has been designed and con- structed for rigorous industrial, classroom or laboratory applications. These power supplies are brand new. Current list price $750.00. Specifications: Input: 120 VAC 50/60 HZ. Output: 0-120 VAC 10 amps. In- cludes manual with schematics. Features: Ammeter, voltmeter, convenience outlet, power indicator and circuit breaker. Dimen- sion : 10" x 15" X 6"- Weight : 22 lbs. Price: $165 OS-8/U PORTABLE OSCILLOSCOPE Oscilloscope OS-8/U having a 3 inch cathode ray tube, is a portable device used in the visual analysis of wave forms of varying electrical po- tential. Specifications: Power Re- quirements: SOW, 105 to 125V, 50 to 1000 cy. 1Ph, AC Frequency Range: Horizontal Amplifiers: to 2 mc- Sweep Circuit Oscillator; 3 cy to 50 kc - Input Impedance; 1.5 meshunted by 25 uuf (AC); 2 meg (DC); 9 meg shunted by 11 uuf - Defection Sensitivity; Horizontal; .075 rms Win (map 1), 17 rms X/tn (direct) -Accuracy: ± dB Price: $50.00 (818) 787-3334 MODEL 130C High Sensitivity X-Y Oscilloscope; Sensitivity of 200 uV to 20V per cm, frequency response to DC to 500 KHz, 1 usee to 5 sec timebase, 5" CRT. Price: $150.00 HEWLITT PACKARD MODEL 606A SIGNAL GENERATOR Signal Generator: Freq. 50kHz to 65 mHz in 6 bands * 1%, freq. catl 100kHz and 1 mHz, RF output 0.1 uV to 3.0V at 50 ohms ± 1dB over freq, range, output VWXR — 30 DBC leverage 0.10V, modulation to 100% + 0.5DB over freq. range. Internal: 400 Hzrt0O0Hz = 5%; External: DC to KHz, Power "MmV, 50 to 1000 Hz, 135 watts. Size: 20W (W) X 12VT (H) x 14W (L). Wt. 46 lbs. Price: $250.00 L.R. TANK PERISCOPE TypeM-24. Rugged military construc- tion. Contains two independent in- frared image con- verter tubes plus correction lenses, prisms, and eyepieces- The binocular view- ing system Is directly connected to a prism- type periscope. The image tubes have dy- namic focus provided by a built-in adjusta- ble voltage divider. This unit requires 10 to 15 KV at low current for operation. Unable to supply power supply. (Dimensions: 10" high x ywide x 4H" thick. Weight 17 lbs.) Stock #OP 9001 Price: $200.00 (800) 235-6222 OUTSIDE CALIF. HP 331A DISTORTION ANALYZER Covers 5 Hz to 600 kHz range and measures total distortion down to 0.1% full scale. Harmonics are indi- cated up to 3 MHz. Measures noise as low as 25p.V, and voltages over a wide range, 300 u.V to 300 V RMS full scale. Frequency calibration ac- curacy is > ±5% from 5 Hz to 300 kHz; > ±10% from 300 to 500 kHz. Basic voltmeter accuracy is ±2%. Price: $400,00 HEWLETT PACKARD 8640B-OPT 323 SOLID STATE SIGNAL GENERATOR (w/o synchronizer) Frequency range: 450 KHz to 512 MHz, to 1100 Mhz with external frequency doubler option (not supplied). Ten Frequency bands in octave increments from 500 KHz; band 11 for doubler use. Ac- curacy: 6 digit LED read out. Stability: < 1000 ppm. Output power: -145dBmto +10 dBm (0.013 V to 2 V) into 50 n. Level flatness is < + 0,5 dB from 0.5 to 512 MHz. Imped- ance is 50 fl, VSWR < 2.0 on 2 V and 1 V range <: 1.3 on other ranges >. Spectral Purity: Harmonics at 1 V outpt > 35 dB be- low fundamental of 0.5 to 128 Mhz; ;» 30 dB be I o w f u nda menta I of 1 28 to 512 M Hz . Mod- ulation: Internal AM, r-M and PM, external AM, FM, and PM. Pulse frequency: 0.05 to 5 KHz. General: Power Requirements: 100, 120, 220, 240 V, 46 hi to 420 hi, 2 amps. Note: OPT 323 built to military specifica- tions. Ruggedized performance for better operation undersevere environment. Size: 6" (H) X VT (W) x 13M" (D). Wt, 60 lbs. Includes ruggedized case and manual. Price: $1850.00 Current Hewlett Packard Price $12,050.00 FAX (818) 787-4732 RE-SHOPPER < LEARN THE SECRETS OF HOW TO FIX ELECTRONIC EQUIPMENT FASTER ON OUR REPAIR TECHNIQUES ON VIDEOTAPE YOUR SATISFACTION GUARANTEED Learn our techniques and make more money repairing electronic equipment. These tapes are packed with much practical information that will save enough of your valuable time to quickly pay for the tapes. Learn from an expert what fails, why it fails, how to find it faster, and how to fix it faster. Much of this information is available nowhere else. These tapes start at the beginning for beginners, but cover each subject so thoroughly that even old pros will learn valuable new techniques and skills, The material in these video tapes is the same material that we have presented in classes that have been taught for the local college, busi- nesses, and industrial maintenance departments. You will find very little of the information presented on most of these tapes in textbooks or in any courses that you have taken elsewhere, Most of the material is original. We show what fails, all of the ways that the various com- ponents fail, how to recognize the failures, and how to test and locate the failures. We also show how to repair and make improvements where appropriate to give a reliable repair. Send payment with order and we will pay shipping. 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BOX 81 3 -RE SELMER, TN 38375 DIGITAL METERS NEW DMM 2360 $129.95 DMM + LCR Meter Most Versatile DMM • Inductance: 1 uH - 40 H • Capacitance: IpF- 40 p.F • Temperature : -40 • 302 °F • Frequency: 1Hz ■ 4MHz • Logic test; 20MHz • Diode test • Continuity beeper • Volt, current, ohm • 3999 count display • Peak hold • Auto power off DMM specifically designed for HAM, checks coil, capacitor fre- quency, temperature and a lot more. DMM 135 $69.95 MEASURE TEMPERATURE • D -1400 o F,-20 o -750°C l .1°,1° resolution « Capacitance:1pF-20jiF • Resistance: .1 £2- 2000MQ • Volt, current, continuity • Diode, hFE tests • Type K thermocouple Included DMM measures temprature using type-K chromel-alumel thermocouple. Very fast response with 0.1" or 1° resolu- tion. CAPACITANCE METER $57.95 • 3 Vz dig its, 0.5% basic a ecu racy • 0.1 pF- 20,000 or • 9 ranges • Zero adjustment ±20 pF • Protected from charged capacitor This meter covers very broad range capacitance from 0.1 pF to 20,000 uE, Zero adjustment of± 20 pE can be used to com- pensate parasitic from the test leads. 10 CIRCLE 269 ON FREE INFORMATION CARD RE-SHOPPER MDUSTRMI, QUALITY SL RELIABILITY 1 5 DAY MONEY BACK GUARANTEE ONE YEAR REPLACEMENT WARRANTY PROMPT DELIVERY & SERVICE QUANTITY &, EDUCATION DISCOUNTS AVAILABLE ALFA ELECTRONICS P.O. BOX 8089, PRINCETON, NJ 08543 1-609-275-0220/(800) 526- ALFA FAX: (609) 275-9536 Visa, MasterCard, C.O.D, Purchase Order Welcome CIRCLE 275 ON FREE INFORMATION CARD OCEAN STATE ELECTRONICS PROFESSIONAL, AMATEUR, OR COMMERCIAL — WE'RE YOUR ONE STOP ELECTRONIC SOURCE CALL OR WRITE FOR YOUR FREE CATALOG 1-800-866-6626 61468 POWER TUBE Most Popular Power Tube Used In HF Transmitters. $13.50 Each SAVE) JBiifJ Buy 2 or mora $1 1 .SO Each CALL US FOR ALL YOUR TUBE NEEDS VERNIER DIALS 1 /1 /2" Diameter 0- 1 Marking $7.25 t 12" Diameter 0-100 Marking $6.25 2* Diameter 0- 1 00 Marking $9,25 RESISTOR KITS GREAT FOR THE EXPERIMENTER OR PROFESSIONAL LAB! 1/4W 5% CARBON FILM 100 Each 177 Different Values 17,700 Places $169.95 1 00 Each 70 Most Popular Values 7000 Pieces $63,95 10 Eacfi 70 Most Popular Values 700 Pieces $15.95 All Resistors Individually Bagged and Labted HANDY BOXES WITH ALUMINUM PANEL ^^^^■^ Made of sturdy plastic. Removable ^^ aluminum cover. Perfect for housing lest equipment, experimental projects. Weal for hobbyists, etc #784 3 1/4" x 2 1/8' x 2 W $3.15 #785 4" x 2 1/8" X 1 5/8" $3.35 #788 8 VA- x 3 3IA - X 2 10" $6.30 STANDARD PANAVISE The 301 Standard PanaVise is the alt- purpose work holding unit. It tilts, turns, and rotates. This combination consists ol the 300 Standard Base and the 303 Standard Head with 343 Ny ton Jaws. Just one convenient control knob locks the work firmly in any postion. WE STOCK A COMPLETE LINE OF PANAVISE CALL US FIRST, WE CANT BE BEAT! MOD 301 $34.99 VOLTAGE REGULATORS 7805 5VAT1A $.49 7808 8VAT1A $.49 7809 SVAT1A $.49 7812 12VAT1A $.49 7815 15VAT1A $.49 7818 18VAT1A $.49 7824 24V AT 1A $.49 LM317T Ad|2-37V $.99 CALL US FOR ALL YOUR LINEAR IC'S, WE'VE GOT 'EM. DELUX CODE KEY Adjustable, heavy duty brass base with ball bearing pivots. Designed for hard usage. 3/18" plated contacts. S9.90 BUZZER Produces steady high frequency signal. Excellent for code practice. Screw control for adjusting pitch. Uses standard 1 1/2V battery. $2.25 m 200 WATT INVERTER Plugs into your lighter and tuns: ■ Ham EquipmeNT ■ Lights ■ Soldering Iron ■ Computer • Power Toots • Shaver • Battery Charger •MUCH MORE Model: Input Output; Power Weight: Warranty POW200 10 to 15 volts DC 115 rails AC true RMS 400 Watts peak 200 Watts for 2 minutes 140 Watts continousiy 5 - x2.6'x1.7' 1 5 ounces 1 year DEALER INQUIRIES INVITED Regularly $149-95 FALL SPECIAL SI 39.95 HIGH VOLTAGE VARIABLE CAPACITOR Ideal for Antenna Tuners JohnsonfCardwell #154-10-1 25-247PF 3000 Volls Air Gap .075" Plates 51 Dsplh 6 7/8' Quantises are Limited Brand New $29.00 each WE STOCK THOUSANOS OF VARIABLE CAPACITORS BY HAMMARLUND, JOHNSON, MILLEN, NATIONAL ETC. REGULATED POWER SUPPUES 13.8VDC Quality 13.8VDC p supplies Perfect for car stereo's. CB equipment, Ham equipment and other 13.8VDC items. Binding post outpuis. MOD 384 4 amp continuous 6 amp surge $21 .95 (REG. $29 98) MOD 737B S amp continuous 8 amp surge $41.95 TO ORDER Call 1-800-866-6626 8 a.m. - 9 p.m. EST Monday through Saturday OB WRITE TO: Ocean State Electronics, P.O. Box 1458. Westerly, OR FAX TO: (401)596-3590 LOCAL CALLS PLEASE USE 596-3060 If paying by CREDIT CARD include Card No. and Exp. Date Mail in orders please include $4.00 shipping Minimum order $5.00 R. I. Residents add 7% Sales Tax . 02891 RFI PROBLEMS? Try this pot core Wrap a couple of turns of your phone Mne, coax. AC line, etc. around the core, secure with a cable tie, and this should help significantly. : • o D. $1 .00 TRANSISTORS 2N91 a TO- 72, VHF OSC/AM P .25 PN2222 TO-92, GP AMP/SW .09 2N3055 TO-3, GP PWR AMP/SW .89 2N3771 TO-3. PWR AMPSW 1.99 2N3B86 TO-39, VHFflJHF OSC ,90 2N3904 TO-92. GP AMP .09 2N3906 TO-92. GP AMP .09 2N4401 TO-82. GP AMP .15 WE CAN SUPPLY NEARLY ANY TRANSISTOR, INCLUDING RE POWER, JAPANESE AND MANY OBSOLETE NO'S. WELLER PROFESSIONAL SOLDERING IRONS 25 Watt iron HSP23 40 Watt iron #SP40 BO Watt Iron *SP80 $10.98 $13.95 $18.95 REPLACEMENT TIPS FOR ABOVE SP23 Iron Tip #MT1 $3.79 SP40 Iron Tip *MT1 $5.25 SP80 Iron Tip *MT201 $5.25 WELLER ALL PURPOSE SOLDERING GUN MODEL 8200 Built in prefocused spotlight. Choice of 100 or 140 watts with pull of Ihe trigger switch. Balanced pistol grip design, replaceable tip. YOUR COST $24.25 Each COPPER REPLACEMENT TIP FOR B2O0GUN $3.07 Tips priced 2/Pkg. except MT201 PRODUCTS & MANUFACTURERS Variable/ Capacitors Keyboards Roller Inductors Shaft Couplers AC Line Cords AC/DC Adapters Breadboards Capacitors Chokes/Coils Connectors Crystals Panavise Test Equipment Chemicals LED's Hammond C Sockets Batteries Insulators Tubes Elenco Thermistors CBK Antennas GST Kits Hardware Vernier Dials Healslnks ICs (any type) Jacks Knobs Meiers Pots Resistors Diodes Spacers saw Oscilloscopes Phllmore Cable TV Acces. 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HH lARfiEH HARD 3R.VEB AVAUflLE Cd AT-hrdHliWbniCrt i ?■ NHX or 2»or stlpEA SYSTEM 6pTW3 DOS V.!!.:i.JI' VQAUpiW Wd VGA Cjvi TIT ■. : ■ I : -. rr v. ■.- i - • and AT4T q*rf IBM — VGA COLOR 1 3" Viewing Area W0M8Q - 3i*ot Pitch BB.un ucw 'B M Mad»i*7W*S0i BHAND NtW H ^ h p ertwmance Gf^ftCS 90 Day Warranty List$1.605 O^LY UNBELIEVABLE VALUE $399 ~ SfcT PofWch AMSTRAD COLOR VGA Ultra-Hi-Res-12" VGA-PC-ModeM 2HR Tilt 4 Swivel -720x480- „ , Anti-Glare Screen Only|j4*I» 1 YEAR WARRANTY - BRAND NEW MONITOR MANIA AMDEK 600T — Color 1 4 - - RGB-Color-eOOxZOO. 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AMAZING ONLY DAC-EASY LIGHTNING LIST - $69.96 A DISK CACHING PROGRAM s 149 SUBSTANTIAL QCIANTITY DISCOUNTS AVAILABLE!! -What The Critics Say: The BKaklhni ZBBpvfotmed flswltsstu with awry application we handed tt. Including copy-protected programs and nine monoey-tesldent utilities at once.' Stephen Mines, PC Magazine *. . . the &&ktlw 286 was tfte card of cfiote * PC Business Softmrevfe* (Rated II) The 12 Mffe Bnmklhm 286-12 speedup Board is tne fcstesi of these tested, but not the most expensive On a dollar perJiorsepower basts. It could be called Ihe cheapest boost available farm XT' Mark Welch, InfoWortd (Rated #1) LIST $1190 AT&T FULL-PAGE SCANNER ,&> w MODEL SC-60 - SHEET FEED SERIES INCLUDES - IBM Compatible Interface Card AT&T PAGE POWER SOFTWARE (Draw, Scan and Fax Package) Microsoft - Runtime Windows Resolution-200 DPI-Full Page/400 DPI-Half Page Half-Tone Feature for Photographs 1 YEAR WARRANTY FROM AT&T I AMA7 llie **)£!>) Quantity Discounts ■09 Available!! Microsoft Windows 3.0 Upgrade Call For Details!!! ■ AMAZING $ u -ra* ■ HILT - * • V ilectrif ied Discounters • • (800) 678-8585 d (203) 287-1976 1066 SHERMAN AVENUE HOUSS: HAMDEN, CT 0651* *to»-Tfcif. s™-?^ FAX 203-2455680 a ' FAX ORDERS and BOS ACCEPTED! 30-Dav Money dealer inquiries invited _ . ~J ' All fVfcr* *n: C*ih DiacuiuiLed. Add 2Vk* tor UlMCt- Back Guarantee ^■^z/^^Jls^T'^'sss^"'*' ol erron nicm n* »u&j«1 to duqp without nana F ULL nCFUHD Of HARENVArt HKE' £o«.jgiMenLi *dd % Mto ui^ NY S»k«-Add JSTY CATALOG MHT WTH ALL OflOCW T*" p . < * y f'? ir '™ *" NB*"fl Pt*0» dc not ppdun* dmHL 3H f*tteekiftg k* minimum an i)l itdiffli. IntMTuukmil QuiiiuM Machine, Inc. RE-SHOPPER i: MWK Industries For Technical Questions Call 714 278-0563 To Order Only-Call Toll Free 1 800 356-7714 9 am to 5 pm PST FAX # 714 278-4887 Educational & Corporate P.O.'s Welcome WE ACCEPT VISA, MASTERCARD 1269 W. Pomona Road #110 Corona, California 91720 SATISFACTON GUARANTEED I! (or any reason you're unsatisfied... return the laser within 30 days for a relund or credit Call us lor your MWK Industries catalog for all our laser products at the lowest prices anywhere. LASERS is our only business. If you have any questions on which laser best suits your needs give us a call. 2-3 mW SEMENS USER-TUBE .5 mW LASER-TUBE Great tor light shows, holography communications or just plain fun!! The These tubes were made by a major laser manufacturer and are only 4* long units are surplus, but have never been used and are as good as new! and 1' In diameter! They make great pointers, small light-shows, weapon- Buy several at this great price. Now only $40.00 Each! sights, or can be used tor educatwnal or experimental applications. [Tube needs a power-supply to operatej Now only $20.00 Each I , W m Sniv twriiM : ..n«"i \J ^V-, Sflrrwns LMMr-Tub* NEW ITEM! OUR LATEST LASER-UGHT-SHOW Comes complete with a 1mW laser power-supply and electronics all in one small package. Runs town AC adaptor (included). Makes hundreds ol pattern variations from built-in oscillators or external audio source. Great tor parties and personal entertainment. Our Introductory price It only (295.00 BASIC LIGHT SHOW u»^i9» This unit can be used with any laser up to 1 Watt ol power without problems, ft comes complete with a control box, scanner box, AC power adaptor and 6' of connecting cable. The built-in osciHator/amplr&er circuitry produces an infinitely variable selection of lissajous patterns. Two RCA jacks permit the use ot an external audio source such as a stereo system to pulsate the patterns to the music An external laser of your choice is required lor use with the light show (laser not included). Great for mobile Dj's, small bars, night-clubs or home entertainment. Our Prtc* 4235 .00 COMPLETE WORKING SUPERMAKET BAR-CODE SCANNER Pull one apart and get a 2-3 working mW laser tube, laser power-supply, polygon-mirror motor, several front-surface minors and much, much more! A bonanza ol parts tor the electronics experimenter. Our Low-Low Price $75.00 {plus shipping and handling charges) Bk Cak Scnw OUR "OPEN-CIRCUrr-BOARO" LASER POWER SUPPLY Is ideal tor the budding laser enthusiast on a tight-budgetl This supply was originally destined tor use In video-disc players, but are now available for your use on any He-Ne tube up to 4 mW. They measure 4' by 12* by 2* with an external transformer, and are now Mlllng for only $24,00 Each) Opan Ctcui Board LASER POINTER Fits in the palm of your hand! Includes 670 nM Toshiba! 7 VDC battery operated. New. 5 1/2" by 3/4". 12 month warranty. Lowest priced pointer that we know of. Our Pric*_ 41 90.00 LASER DIODES 5 mW 670 nM Toshiba 9211 with glass LR collimator, Heat sink & 4.5 to 12 VDC P.S. All contained in 1 1/4" by MST package flew*. Projects up to 200 feet. Our Price 4210.00 WE BUY, SELL & BROKER NEW & USED LASER EQUIPMENT ALL LASER PARTS ARE SOLD AS COMPONENTS ONLY WARNING: DO NOT BUY THESE PRODUCTS IF YOU DO NOT KNOW THE DANGERS OF IASEH ENERGY. WE TAKE NO RESPOKSmiTY FOR YOUR ACTtOKSII WHEN ASSEMBLED TUS LASER MUST INCORPORATE THE SAFETY REQUIREMENTS OF THE CENTER FOR DEVICES AND RADIOLOGICAL HEALTH OF THE FOOD AND DRUG ADMINISTRATION. CIRCLE 295 ON FREE INFORMATION CARD Be an FCC LICENSED ELECTRONIC TECHNICIAN! Earn up to ► $30 an hour r and more/ GUARANTEED PASS... Here's our famous warranty that you will get your FCC License or your money will be refunded. You can earn more money if you get an FCC License Not satisfied with your present income? Add prestige and earning power to your electronics career by get- ting your FCC Government License. No costly school. No commuting to class. 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So, mail us the coupon and we'll rush you complete information FREE by return mail. Read What Others Are Saying "Tfes, I got ray FCC license. I also got a pay increase and am now studying for the Radar Endorsement.' — JC, Hope, AK "I studied for only one weekend with your course and didn't miss any questions on the test." — HS, Tampa, FL "When given my exam and I began, I could barely believe my eyes, it was just like sitting at home studying your course.' — TB, Mines, OR "I got my license which changed my life immediate- ly. I am now in Communications servicing FM 2-way equipment. This was accomplished only because of your material." — MK, Glenn Falls, NY "Tfcur study tapes and manuals were wonderful. I've passed my test today and I owe it all to your books and tapes. Thank you so very much." — TB, Bloomington, IN I I I I I I I I I I I comnwinD productiohs r> 93 FCC LICENSE TRAINING Custom House POB 2824 San Francisco, CA 94126-2824 D YES! Please rush FREE details immediately on how I can study at home for my FCC License. Name Address City State .Zip. Mail This Coupon Today! CIRCLE 277 ON FREE INFORMATION CARD RE-SHOPPER 15 REPLACEMENT BATTERIES KKSB (ALL NEW- MADE IN USA) ICOM 7S 13.2k 1200 mah J59.Q0 8S9.6v1200 mah $59.00 BP7 13.2v 600 mah tsa.no BP8 8.4v10O0 mah $59.00 SA/SAT BPB2.BP83 BP83A 7.2v 750 mah BP84 7.2v 1000 mah BP85A9.6v6GQ mah BP85B12V60D mah I m KENWOOD 111 PBi 12v 1000 mah KNB4 72v2200 mah PB6 7.2v 750 mah PB7 7.2v 1500 mah PB8 12v750 mah $59.00 SS9.00 S4E.0O S55.00 $55.00 MOTOROLA HT300 7.2v 1600 mah $45.00 HT9D 12v600 mall $34.00 HT440 12v 600 mah HS.OO MT500 15 v 500 mah (39.00 RADIUS P-10 500 mah USM SABER 7.2v 1100 mah $59.00 YAESU FNB-2 v500 mah SZ1.00 FNB-2 * 600 mah $23.00 FNB-4A FNB-10 FNB-10S7.2V1000 mah $43.00 FNB-12 FNB-12S12v600 mah $45.00 SPECIALS ICOM- SA/SAT BP-84 7.2v1000 mah $49.00 BP-85B12. 600 mah $69.00 li INSERTS KENWOOD PB-21 $13.00, PB-25, 26- J20.00 I ICOM BP-3 $17,00. BP-5 KZ.00 BP-7. BP-8 CAMCORDER JVC PANASONIC PVBP80/8S 1 2v 2.3 amps RCA/ HITACHI Full size VHS-C SONY NP22 NP55/77 ALL BRANDS AVAILABLE CELLULAR MITSUBISHI NEC NOVATEL PANASONIC Bag Phone Kits MOTOROLA "FUF' $60.00 $60.00 $45.00 $45.00 $45.00 $55.00 •ALL BATTERY PACKS - GUARANTEED TO HAVE THE ADVERTISED CAPACITY ™talog BATTERY-TECH, INC. DEALER INQUIRIES 28 " 25 215 PLACE ' BAYSIDE, N.Y. 11360 • FAX 718-461-1978 welcome 800-442-4275 - N.Y.S. 718-631-4275 MASTER CARD CIRCLE 271 ON FREE INFORMATION CARD 1 5 CHARACTER LCD MODULE SEND FOR OUR FREE CATALOG DISCOUNT SURPLUS PRICES! Compact 9-12 VDC Coil RELAY 30 Amp, N.O Contact ■ Compact sealed unit 1.05"x1.05"x1.25" > Contact: Normally Open 30 Amps at 30 VDC 30 Amps at 1 20 VAC inductive or resistive 12 Amps at 277 VAC inductive or resistive ■ Coil: 9 -12 VDC 95 ohms Dissipation 500 mW $1.99* Order #1095 AZ#2100-1A-9DE •hTmiimi • Intelligent Display LSI HD44780 & HD44100 chips Full ASCII character set Interfaces to 4 & 8 bit mpu's • Ideal for battery operated devices instructions & applications included (Also see June & July RE article: "Add a Display to Your Project") • Brand new - still in the box! fpZJm 95 Order #1099 5 VDC , 2 ma, 3.85" x 1 .75" x .25" ELECTRONICS 1224 PROSPECT, LAND, OH 44115 CALL (216) 621-1121 16 R&D Electronics is the mail order branch of ELECTRONIC SURPLUS of Cleveland, Ohio CIRCLE 272 ON FREE INFORMATION CARD RE-SHOPPER BIG SAVINGS on quality brand-name products Miniature Bench Fan Whtsper-quiel fan blows away Inflat- ing solder and glue fumes. 50 CFM. 120 VAC. 4-1/2"H. ZCF-1 Rag. 425.00 SPECIAL * 1 8.00 Precision Duster Removes dust without scratching, sensitive surfaces. Features a precise chrome- plaled brass valve. Replaceable canister contains an EFA approved, ozone safe gas. ZCK1200 Rag. $26.25 SPECIAL WMO Welter 35 Watt Soldering Iron LOW cost, quality iron excellent for electronic soldering. Screwdriver tip included, 3-wire cord. Cax.Ho. Dwcription R»g- special ZWP40M 35 Watt Iron $3S.6S $28.00 ZPHOO Iron Stand 18.2S 13.00 (LuXb) Lamp with Built-in Magnifier Great bench tamp has rectangular lens (4-1/2" x 2-3/4") and magnifies objects 1 75%. Spring-bal- anced arm reaches up to 36". Complete with a 60 W bub and desk mounting damp. Black. Cat Ha, Beg SPECIAL Z16Z72 55075 539.80 Welier Professional Temperature Controlled Soldering System Wktefy used in industry. It maintains a constant tip temperature of 700 °F. Grounded tip protects components from vctlage spikes. Com as with power Unit, iron, stand, sponge 4 700 "F tip. ZWTCPS Rag. $128.65 SPECIAL tM.OO Flux Core Solder Highest quality electronic-grade sol- der. 1 lb. spool. 63/37 alloy, type RA rosin flux core. CI. Ho. Daacriplion ONLY ZA63-20-SC2 ZA63-32-SC2 ,020 .032 $11.35 8.53 ^^4 100-Piece Precision Tool Set Contains 33 chuck-type knurled han- dles, 2 each of 33 different miniature screwdriver, hexdriver, nutdriver and wrench blades plus one 3* handle extender in a wooden case. 2730199 Reg. $143.05 SPECIAL $99.00 (mxb) "SPECIAL $59.95 Reg.^*e*fr Model REIMS V Desk and Bench Lamp Translucent shade allows soft light to liller Ihrough. Spring- balanced arm and clamp-on base. 75 watt, UL listed. White. Cat. Ho. Rfij SPECIAL Z1SO03 $39 95 $29.00 The Professional's Tool Case • Case top has built-in document holder • Case bottom is partitioned into 3 areas • Two removable pallets hold oyer 60 tools A handsome black case to organize and transport your valuable tools and instruments. This is Ihe same quality case used by literally thousands of professional field engineers. Case is made of high impact polypropylene, and has snap-action key locks and a padded handle. Sizetl 7-1/2" x 12-1/2" x 5". Tools are not included. lit 25-Piece Alignment Tool Kit A complete set of adjustment lods used on ail communication gear. Z82S3 flag. $3430 SPECIAL $29.00 1/4'Hex Insert Bit Set A 33 piece set with a full assortment of 1" slotted, phHIips, square recess and clutch bits (4 each) plus 7 hex (5/64"-3/16") & 9 torx bits (T8-T40) in a case with one 2" exlenston bit. Z15693 Rag. $36.95 SPECIAL $29.65 Compact Zipper Tool Case Great way to organize and protect tools in the car, boat or home. Black durable Cordura* case Is designed to carry 20 tools plus a pocket size DM M , Built-in pouch holds small parts. 1 1 * x 8" x 2-1/2". Tools not Included. ZZP1 R*g. $28.00 SPECIAL $24X0 Xcelite 10- Piece Nutdriver Set Full hoHow-shaft nutdrivers have color-coded handles In sizes 3/16" -9/1 6". ZHS0-1B Reg. $40.40 SPECIAL $38.00 DREMEL 32-Pc. Power Rotary Toot Kit The perfect tool lor precise grinding, cutting, carving, sharpening, drilling or polishing. Lightweight, handheld, high-speed (28,000 and 15,000 RPM) tool comes with case and 30 acces- sories, Z2850 Rag. $84.90 SPECIAL $78.00 Money Back Guarantee! Offer Expires January 31, 1991 Tm[ Via*. MC. Anwx. P.O.* tram o^Kad frma. Add $550 lor packing a (Mvary. Contact East, he. • 335 WHIow Strwt • North Andovar, MA O1S45-5S05 TO ORDER CALL 1-800-225-5370 In MA: (508) 682-2000 CIHCLE 298 ON FREE INFORMATION CARD RE-SHOPPER 'JttwcUi&M, StejcfooHict *}*tc. GRAPHICS TABLET • Kurta Series -One • Bvi'Xir Writing Area • Serial RS 232C Interlace • Factory Refurbished • Includes Drawinrj Pen pkiwjm-jsw •rj IBM PC/2 CARRY CASE • Genuine IBM Product • Designed lor PS/2 Model 25 ■ Also works great with Macintosh + , SE • Removable casters & leel » Heavy duty padded nylon construction • Completely unzips lor easy storage $ -4 QQ K • Size 15' * 14' 1 16" ISJ el. Pv\ ttt 720-6*2? SAfpng t Knotog *$S0 H 3Vi" FLOPPY DISK DRIVE *QA • Mounted in 5V. "Bracket • 1.44 MB • Tan Face Plate • Sony MD-F73W-32D •a. Pin No. 220-ww SotffiftJ itstrtrQ 'i?5M 84 AT KEYBOARD * Qn • Standard 84- Key PC/AT Layout 'JSl « • Urge L-Slaped Keiura • Num. Caps. Scroll lock LED in Keys • IBM PC/AT Plug ComparJMe (non-Switching) ea. PwtJ*Q msm IRWIN TAPE BACK-UP DRIVE • For use In AT /Class 286 or 386 Machines only • Connects Eo FD-HO Com roller only. • 20 MB Storage • Use DC 1000 Tape (not included) • Model 125 • Rt»5*"l(Oll • Beige from panel • Includes Software Wn 2J0 34DS Protect Your PC From Data Theft! STOPLOCK IV 195 « fin No 350-310* W/EncryptiOll The STOPLOCK IV is an add-on card specifically designed for use 5 ocrt Witt IBM PCflCT/W and all 100% compatibles with DOS 21 or tOU ea. higher. The addition ol this card will provide the user with pro- F*i w »o iios tecn'on from unauthorized use, data theft, software modlflrja- This easy to use computer and information security system is tolatly menu driven and can support up to 32 different passwords or users. As well as limiting access to the computer it also limits access to hard drives, printers, comm ports, and up to 9 disk drives Authorized users can have limited access cased on the day of the week and the lime of day. File access can be broken down into tour different levels: 1) No access 2) Execute only 3) Head only 4| Write only Directory access can be broken down into four different levels: 1) No access 2) Execute only 3) Read only 4) Write only Optional file encryption is available using three different methods, Electronic Code Bonk (ECB) Cipher Feed Back (CFB) and Chain Block Cipher (CBC). This is very useful tor protecting data that must be transferee between PCs either by diskette or by serial communication. Perhaps the most useful of all features is the audit ball of access thai permits detection and after the lact investigation of security violations. Only the Security System Administrator has access to Ibe audll trail utility. Nuts: This card cannot be used with MICRO-CHANNEL architecture. IBM PC/AT CASE ;»«*•« • Genuine IBM Case • Slide -Of! Top ACCEPTS MINI OR • Full See AT Case fUU-SIZE »w No aroint MOTHERBOARDS M9 StKfrfV i MtOWQ "t 7 i GENICOM PRINTER « Genicom 3184 ■ Dot Matrix 9PN Wide Carriage • 200 CPS • Built-in Tractor Feed • Factory Refmbished • Serial Interface . industrial Quality Pin No 220-3701 Sflipovc i H#sdtoo WQQ M 5295 vi? ea. PC/XT KEYBOARD 5150 • Caps Lock. Num luck LED in Keys • 84-key design with large return (extra return key in number pad) • IBM PC/XT compatible only • Zenith Part No. 100 - 1861 ™TL_____ '.'.'A'.'.rr"? • if 1. I /U l, • Manufactured by ALPS Pin No 220-370G SAppng tH*"*w "* 50 N firm PC COMMUNICATIONS BOARD • S7WBisync • PC/XT, AT Compatible ■ Synchronus Port • Complete Software 8 Documentation • Emulates IBM 2770. 2780, 3471. 3780 • Requires Synch tonus External Modem Put no 220 3im 9m*S l Haootac U SO H MS DOS 3.1 - Xerox MS Dox 3i • Complete Software • Includes ail manuals • Screen mate • GW Basic ■ Hardware Utilities • 5W - Disteltes Part HO 2H < 3KC S^pp^SH*5*v»i5»H PROFESSIONAL PIXEL A software tutorial that teaches Hie use of Graphics. Sound & Ani mation usi ng "Basic " C H ft Phi No. 229-3904 Shippms 4 Handing '1 50 *» V 1 1 101 ENHANCED KEYBOARD fl • IBM XT/AT Switchcable J£' • 12 funcuon Keys «^* • Caps Lock. Mum Lock, Scroll Lock LEOS. • Separate Cursor I Home Keys • Jses "New" 6-Pin Mini Din Connector for New "Micro-Channel" type Computers aw** s Kin** h son • Require Special Adaptor lor use with C A A Standard 5-Pin Din Connector ™f SJ »83 HI [not inducted J Pa*1 FH-a 2M - aim ea. 95 KEY ENHANCED KEYBOARD • PC/XT 4 PC/AT Plug Compatible • Switch for XT/AT - • 10 Function Keys ■ Separate Curser 8 Home Keys ■ Numlock, Cap Lock. Scroll lock Lights • K-1S5 Pi'l No i201am Sfiflonff I Mtoaac «6 SO H PC/XT ENHANCED KEYBOARD •• IBM PC/XT Compairhle S ^Q • Separate cursor t, home keys ^w • Num lock. Caps Lock LEDS in Keys • Designed lor PC 41 S PC-6 pmNo.Ko.ax swans ! ruiovjj tse el VP-PUNNER 1Q95 * Has erer V t h | "5 ''^' 3 ' has with more I v ea. features and more functions • Spreadsheet Software ■ Compatible with %-t-V Release 1A • US. Governmenl verr^on ■ PC/XT, AT IBM CompaliWe • 5V4" Oisketles Pin Mo JKujoi STNppng 4 Htnotofl HIO? n • 95 Key - PC/XT only • Made oy Cherry 1 10 Function Keys S 19 9 I ONAL DOS ea. A Software Tutorial on How to Use 00S & all its Commands swntiMii^ii IU ea. Mendelson Electronics Co., Inc. 3^0 E Fifsr Street ■ Davton Ohio 45402 800 422 3525 • f AX 513 461 3391 • 513 461-3525 1 * Hwr to- rn lfl> #riki Iv lUi'tm,* I CO D *M JtUKAUd $4 U 20% Restocking Fee on Non-Defective Returns CIRCLE 253 ON FREE INFORMATION CARD 16 RE-SHOPPER 7%€#tdeJU&*t £(ecfoo*Uc4, *)*&. THE COMPLETE ANSWERING MACHINE Sophisticated PC Voice Messaging System. Ads as an An s waring Machine, Sends massages to a list of people, Gtf« messages & Transfer* calls. Support? up tp 999 Voice-mailboxes. ISM PC/XT, AT COMPATIBLE PART MO. 22*KHWN* Shipping A Handling $5 ea. $175 IBM PCjr, EXTERNAL POWER SUPPLY J, Genuine IBM part #8600006. PCjr. Power Supply. Sidecar Expansion Attach mant. Allows lor three additional expansion attachments. Part HO. 500-001 3-R Shipping A Handling $6 < % $19 9 J IBM PS/2 BUS CARD W/ BATTERY Genuine IBM pwl # 61X891G. Includes 3V lithium battery. Part No. 220-0016-R Shipping A Handling .f^^O e.i. $25 IBM PCjr JOYSTICK Genuine IBM pari. Self centering lever. Part Ko. 220-350 t-R Shipping A Handling $ffl < C" 20% Restocking Fee on Non-Defective Returns CIRCLE 253 ON FREE INFORMATION CARD RE-SHOPPER 19 ► i> II Numbers 1 thru 36, plus and 00 (38 LED's). Game board for "betting" included. Automatic shut-off. As much fun to assemble as it is to play. Easy-to-follow instructions. A hands-on introduction to high technology. BT-805 A game of chance, just like at all the casinos. No ball to lose, no wheels to spin. At the push of a button electronic sounds and flashing lights go off. . .and where they stop nobody knows. ELECTRONIC ROULETTE GRAND PIANO BT-802 A kit that teaches you the basics of electronics, and a miniature piano to play once you're done. Instructions as simple to follow as do-re-mi. A 47-note memory allows you to replay your tunes over and over. 15 notes spanning 3 octaves. Play your own originals. Or, set up to play your choice of 15 pre-programmed melodies. A hands-on introduction to high technology. OWI Incorporated 1160 Mahals Place Compton. CA 90220 213.638.4732 FAX: 213.63S.S347 NEW AFFORDABLE - PRECISION TEST EQUIPMENT E.T. Tech., Inc. - Division of Empire Telecommunication Inc. SIGNAL SYNTHESIZERS I SYNTHESIZER PULSE GENERATOR [i I t , SG-100 $685 , .1000000 Hz. - SG-100 """ mi - Six Digit resolution, .005% accuracy low distortion sine wave, output and adjustable to 20 Vp-p with 50 ohm output impedance and TTL. GPIB Option. SG-102 - $955 - Dual signal independent out- put or phase locked to one of 16 phases. SYNTHESIZER FUNCTION GENERATOR l-'I I'M; \ 1 1 M rrr ET.Tech.,inc T SFG-33 $1275 .100000 Hi. - SFG-330 32.9999 MHz. Waveforms are provided with six digit resolution, .005% crystal accuracy. Wavefsrms are sine, triangle, square, and rising and falling ramps, with dc offset and 20 Vp-p 50 ohm output over 80 dB range and TTL. SFG-330 - $1789 • Keyboard and GPIB entry dBv and recall features. Options; 66 MHz. and dual Quad output. ;' ,___ • • • PGS-33 $1355 .100000 Hz. - PGS-33 M MHz Provides digital pulse train synthesis with six digit resolution. Control of single and dual pulse delay and duration. Multi-modes in- cluding burst pulse train and variable duty cyle. Output to 20 Vp-p with 50 ohm im- pedance. D.C. offset with TTL. CLOCK SIGNAL SYNTHESIZER 1 • • CSS-33 $1095 .100000 Hz. - 65.9999 MHz. CSS-33 Clock signals have six digit frequency resolution, cryystal stability and .005% accu- racy. Squarewave output .002 to 20.0 Vp-p with 50 ohm output impedance and TTL. DUAL SIGNAL & PHASE SYNTHESIS «»^ M Hicn .100000 Hi. - SG-112 $1350 99.999 KHz. Dual signal low distortion digital syn- thesis. Independent or locked signals. Locked signal phase resolution to .01 degrees. PM-100 $855 Measures test signal phase to .01 degrees as compared to reference from 10 Hz. to 2 MHz. SIGNAL DIGITIZER & SCOPE MEMORY WAVEFORM GENERATOR SD-200 $795 Signal digitizer captures signal transient for scope display. Adjustable sampling with 200 nsec. maximum, stores 8 Kilo-byte with 5W amplitude resolution. Pretrigger display enables analog scope to operate as a storage scope. SD-240 $1395 Waveform Generator captures signals and allows for signal data entry with a light pen. To nrrter or for mnrp information nail or writfi - 15 South Van Brunt Street, Englewood, N.J. 07631 Phone 201 569-3339 Fax 201 569-5838 20 RE-SHOPPER CIRCLE 273 ON FREE INFORMATION CARD WE HAVE AVAILABLE OVER 125,000 SURPLUS PLUG-IN WALL ADAPTERS. THESE ARE ALL BRAND NEW IN A WIDE RANGE OF VOLTAGES AND CURRENTS IN BOTH AC AND DC OUTPUTS. WE ALSO HAVE 220/240VAC ADAPTERS AND DUAL OUTPUT VOLTAGE POWER SUPPLIES. PHONE OR FAX US FOR OUR LATEST ADAPTER CATALOG OR CALL FOR AVAILABILITY AND PRICE QUOTE ON YOUR NEEDS. WE ARE ALSO INTERESTED IN PURCHASING YOUR EXCESS ADAPTER INVENTORY. CONTACT US TODAY! 12VDC/100ma WALL ADAPTERS Panasonic 12,000 IN STOCK AT PRESS TIME! ! © EA/5000 SI. 10 EA/1000 S1.20 EA/ 100 $1.35 EA/ 50 2.1iranID/5mmOD plug SURPLUS TRADERS specializes in the distribution of surplus parts and equipment to the electronic, computer and hi-tech industry. We publish a wholesale surplus catalog which is available to the trade at no charge. Please make your request on your company letterhead or accompanied by your business card. II you indicate your areas of interest or specialization - we will key our computer to target special offers in your field of Interest. Hobbyists and those not in the trade may obtain our catalog for a handling charge of S2. SURPLUS TRADERS P.O. Box 276 Winters Um Albarg, Vermont 05440 514-739-9328 (Fax 514-345-8303) CIRCLE 257 ON FREE INFORMATION CARD RE-SHOPPER 2 OAK M35B CABLE TV EQUIPMENT Converters, Descramblers, Remote Controls i 39.95 10 34.95 JERROLD (compatable) SB-3 69.00 50.00 JERROLD (compatable) Tri-bi (Fast Tr-bi) 89.00 60.00 JERROLD 400-DRX-3DIC (with a Built in SB-3 and with remote) 139.00 99.00 SCIENTIFIC ATLANTA SA-3 89.00 60.00 HAMLIN MLD-1 200 79.00 55.00 HAMLIN CR-6600 (with a Built in Descrambler and with remote) 149.00 119.00 TOCOM Add On (Descrambler) 139.00 99.00 TOCOM 5503 Vip (with a Built in TOCOM Descrambler and with remote) 299.00 249.00 Same Day Shipment On Most Items CALL NOW 800-822-9955 Call For Larger Quantity Pricing No CA Sales CABLE PLUS Dealers Wanted 14417 Chase St., Suite 481, Panaorama City, CA 91402 COMPLETE 12-MEG SYSTEM WITH 101 KEYBOARD. 640K MEM, CASE. P0VER SUPPLY, MULT I - ID CARD YITH/SER/PAR/GAHE/CL 12 IN AMBER HQNITOR^l FLOPPY DISK DRIVE tS.25 OR 3.5 IN. I ADD 259. OD FDR 20-MEC HARD OR _M. .m: LM317T- .49 - ; V m SfA LM7I CT— , 49 El". 43 fe MDRE TYPES IN STOCK! n LEDS 10/1,50 1N4005 20/1.00 8088 CONTROL BOARD •1G LATCHED OUTPUTS »16 BUFFERED INPUTS 7 ADDRESSABLE INPUTS 7 HI -CURRENT OUTPUTS • B CHANNEL ANALOG IN Diionnn D •ON BOARD EPRDM PROD RAMMER EASILY •TRANSFERS YOUR PROD RAM TD EPRDM BQB8 BOARD VITH PROGRAMMER- I 79 .00 POWER SUPP W 21V FDR EPROM- 59.00 PAK ASK RAT ELECTRONIC PARTS P.D. BOX 690073 HOUSTON. TEXAS ZIP 77269 713-893-0313 ' FDR A FREE CATALOG FAX ■ 713-583-1446 HDURS:NDDN TD 6:00 MON-FRI 9:00-1:00 SAT AUTO ALARM NODULE CDHES VITH HOOD AND TRUNK PIN SY AND HODKUP INST. PHDfi CHARGE criNTR HL -.r? USE THIS TD CONTROL YOUR CHARGE CURRENT FRDM A SDLAR PANEL ARRAY DR ANY OTHER CURRENT SOURCE. AUTOMATIC LOAD MONITORING 26.50 KIT/34. SO ASSEMBLED 1/2 INCH PROTO-BDARD JUMPERS . 3.00 PER THOUSAND HOME ALARM MODULE I KIT! 2-ZONE CONTROL USE B ATT. CHARGE TO CHARGE B/U BATTERY . 27.50 EAIIf RSB3S0! o R-F SPECTRUM ANALYZER [KIT] D-SOO MED 420-900 MEG 199 DO BASIC KIT BASIL KI I aAWUmAvv SIMPLER VOICE REPEATER OSES BIGITAL STORAGE MOD- ULE TO STORE VOICE AND RE-TRANSMITS VOICE. WO NEED FOR EXPENSIVE DUP- LEXERS. CONNECTS TO YOUR 2-VAY RADIO, i99 qq FEEDTHROUGHS . ELIMINATES UNWANTED R-F =<=*£o= 2.00 PER HUNDRED SURPLUS PHILLIPS PH-3216 SCOPES '/ A o am am r ■ ■ ■ ■■ . • © © 30 DAY WARRANTY 3S-MEG 349.00 CURRENT L1HITER/BATT. CHARGER GREAT FDR BATTERY CHARGING OR WHEREVER CURRENT-LIMITING IS NEEDED . 12. SO EAIM .TELEPHONE LINE ANSWERING DEVICE ANSUERS PHONE AUTOMATICALLY HAS PROGRAMMABLE TIME OUT AND HOLBING 19.50 EAI (KIT! •43-VATT SOLAR PANEL £99 OOtt • 51 -WATT SDLAR PANEL 339-001! • PR-5 300-VATT WIND GENERATOR 950.00 • PR-6 400-VATT WIND GENERATOR 950.00 • PS -7 10A CHARGE CONTROLLER •PR-B TRACE 2O0O-YATT INVERTER- 1090. 00 •PR-9 BD-AMP HYDROELECTRIC SYSTEM- 1310 . 00 GIANT SDLAR PANEL 3/4 AMP 14.4V 13x36 IN 48.00 EA! 2 RE-SHOPPER CIRCLE 274 ON FREE INFORMATION CARD B. G. MICRO B. G. SPECIALS THE S25 NETWORK (9 O 2018 P-15 2K x 8 N-MOS Trimmed Leads, But will Pit In Socket*. Super Buy 10/2.95 105/22.00 2N4401 Super 2N3904 NPN Switching Transistor 40V-TO-92 P.C. Leads 15/1.00 1000/20.00 RGP-15D (NTE580-ECG580) 1.5 AMP 200 V Fast Recovery Diode Taped & Reeled Box of 1500/14.95 1/4" BLACK HEAT SHRINK TUBING 4 Foot Length 994 .14 ,15 LS122 .35 LS123 .45 LS125 .30 LS126 .35 LS132 .35 LS133 .25 LS13B .35 LS139 .35 LS145 .75 LS148 .35 LSI 51 .35 LSI 53 .35 LSI 54 .05 LSI 55 .50 LSI 56 .42 LS157 .30 LS15S .25 LS160 .25 LS1S1 .35 LS162 .45 LS163 .36 LS164 .45 LS1G5 .60 LS166 .75 LS169 .90 LS173 .60 LS174 .35 LS175 .35 LS181 1.25 LS1S1 .45 LSI 92 .65 LSI 93 .65 LSI 94 .40 LSI 95 .52 LS196 .55 LSI 97 .75 LS221 .50 LS240 .50 26LS32 25LS2569 LS241 .60 LS242 .65 LS243 .50 LS244 .55 LS245 .55 L8251 .45 LS253 .40 LS257 .35 LS256 .45 LS2591.00 LS260 .40 LS266 .30 LS273 .75 LS279 .30 LS280 .60 LS283 .35 LS290 .70 LS29B .65 LS323Z25 LS3531.00 LS357 .00 LS363 .75 LS3B5 .30 LS367 .35 LS368 .30 LS373 .50 LS374 .45 LS37S .35 LS377 .75 LS37B .80 LS390 .80 LS393 .75 LS3991.00 LS5411.20 LS645 .75 LS646 .75 LS670 .80 .75 1.50 TryTheftfTruryLoifCosfL*.* . Connect 2 or 3 PCs, XT*, ATs • Uses serial ports and 5 wire cable ■ Runs at 115 K baud • Rum In background, totally transparent • Share any device, any file, any time • Needs only 14K of ram Skeptical: Wo make be/feversl LOTUS 1-2-3 VALUE PACK For 2.0 and 2.01 This software package Includes: • PostScript Device Support • Enhanced EGA and VGA Display Support • Lotus Speedup • Lotus Learn • Lotus Prompt Hotline: Free Premium Telephone Support ■ Copy Protection Removal Complete Manual and 5-1/4 Inch, 360 K Disk Brand New in Sealed Packages ONLY $3.95 +50C Postage & Handling WHILE SUPPLY LASTS! CLOCK CIRCUITS SAF3019 2.50 58321 2.50 146816 3.50 SOCKETS P. 0. Box 280298 Pali**, Tmm 75228 (214) 271-5546 TEXT TO SPEECH R0ARD PC/XT COMPATIBLE. MAKE YOUR COMPUTER TALKI $69 95 ASSEMBLED & TESTED ADO 53,50 SHIPPING * HANDLING A VERY POWERFUL AND AMAZING SPEECH CARD. USES THE NEW GENERAL INSTRUMENTS SP0256-AL2 SPEECH CHIP AND THE CTS2S6A-AL2 TEXT TO SPEECH CONVERTER. THIS BOARD USES ONE SLOT ON THE MOTHERBOARD AND REQUIRES A COM SERIAL PORT. BOARD MAY ALSO BE USED IN A STAND ALONE ENVIRONMENT (EXTERNAL POWER SUPPLY) WITH ALMOST ANY COMPUTER THAT HAS A RS232 SERIAL PORT. TO USE THE BOARD IT IS ONLY NECESSARY TO SEND ENGLISH TEXT TO THE RS232 INPUT ON THE BOARD. THE BOARD INCLUDES A 1500 BYTE TEXT BUFFER AND HANDSHAKE LINE TO ALLOW YOU TO SEND DATA TO THE BOARD; THE SAME AS YOU WOULD SEND DATA TO AN RS232 SERIAL PRINTER. YOU CAN SET UP BATCH FILES THAT WILL MAKE YOUR COMPUTER GREET YOU WITH "GOOD MORNING MASTER," ETC. EVERY TIME YOU TURN IT ON. DEMONSTRATION SOFTWARE AND A LIBRARY BUILDING PRO- GRAM ARE INCLUDED ON A 5V. INCH PC/XT DISKETTE. FULL DOCUMENTATION AND SCHEMATICS ARE ALSO INCLUDED. FOR INFORMATION ON A LOW COST SPEECH SYNTHESIZER SYSTEM FOR THE VISUALLY IMPAIRED. PLEASE SEND FOR FREE PACKET T.M.I. STAND ALONE POWER SUPPLY FOR ABOVE ADO S2.50 SHIPPING 1 HANDLING *19 99 Low Profile SOLDER TAIL 6 Pin 14/1.00 8 Pin 13/1.00 14 Pin 13/1.00 16 Pin 13/1.00 18 Pin 13/1.00 20 Pin 13/1.00 22 Pin 13/1.00 24 Pin 8/1.00 28 Pin 7/1.00 40 Pin 7/1.00 BUY S" GET $1.00 - FREE CHOICE 6500/6800 6502 2.00 6821 1.00 6520 1.25 6845P 2.20 6522 2.70 6845S 2.20 6530 3.00 6850 1.75 6532 4.25 6852 3.50 6545 2.10 6860 3.95 6551 2.40 68681 3.00 6800 1.40 66A09EP 1.29 6802 2 50 68A40 4.00 6803 3.00 68A54 3.00 6805 2.95 E8B09 4.00 6609 EP 2.75 68810 2.00 6609P 2.50 68B45 4.95 6810 1.25 68B54 4.00 STATIC RAM 2016-2KXB 200 n.s 1.00 2101-1 -256X4 500 n.s. .. .75 21L02-1 350 n.s 65 2102AL-4 L.P, 450 n.s. .. .49 2111-1 256X4 500 n.s. ... 1.00 2112A-2 2.50 2114L-3 1KX4 300 n.s. ... .45 2125A-2 1KX1 70n.». ... 1,70 2147 4KX1 1.95 6116P-4 1.20 6117 1.20 6264-15 1.40 62256 32KX8 G.50 DYNAMIC RAM 2108-4 8KX1 1.MJ 2118-4 16KX1-5VoH 70 4027-4KX1-250 n.s .60 4116-16KX1-250 n.s .40 4116-16KX1-200 n.s .75 4116-16KX1-150 n.s .90 41 64 -64 K 200 n.s FKI 4164-150 n.s. 1.25 4164-120 n.s 1,50 4164-100 n.s 1.75 4464-150 n.s 1.90 4464-120 n.s 2.20 4464-100 n.s 2.55 4464-80 n.s 2.70 41256-150 n.s 1.75 41256-120 n.s 1.85 412S6-100 n.s. 1.92 41256-80 n.s 2.05 41256-60 n.s 3.00 1 Meg - 100 n.s 5.7S 5.90 44256-60 n.s. 256 X 4 ... . 6.30 SIPPS & SIMMS AVAILA BLE EPROM SPECIAL We bought a large quantity of 2708s, 2716s, 2532a, 2732s, 2764s, 27128s, 27512s and 27256s from a computer manu- facturer who redesigned I heir boards. We removed them from sockets, erased and verified them, and now we offer the sav- ings to you. Complete satisfac- tion guaranteed. Your Choice 2706 ISO 10/ 8.00 2716 1.75 10/15.00 2532 2.00 10/17.50 2732 2.00 10/17.50 2764 2.25 10/20.00 27126 3.20 10/27.50 27256 3.85 10/32.50 27512 5.50 10/48.50 8000/80000 0031 8035 8039 3065 8066 8087 8087-1 2.95 1.00 1.00 1.55 1.55 87.50 167.50 6087-2 127.50 THREE CHIP SET 16450, 1488, 1489 B.G. SPECIAL $6.95 6088 60C98 6155 8156 8202A 8212 3214 3216 3224 8226 8237-5 8243 8256 (16450) (16550) 2.70 .40 2.25 2.25 8.00 1.25 2.00 1.25 1.25 1.75 3.80 1.75 2.95 6.50 12.00 8251 6253-5 8254 8255 6255-5 8257 8259A 6259C-5 8275 8279 8284 8286 8287 8288 8530 8741 8742 8746 8749 6755 80286-8 PLCC 8.50 80287-8 191.50 60287-10 227.50 V-?n-inMH7 6 4fl 1.10 1.75 1.80 1.50 1.75 1.50 1.85 2.10 10.95 2.25 1.49 3.50 2.49 3.50 3.00 7.00 7.00 7.00 7.00 7.00 CO § 3 3 2 2 p* O O TERMS: [Unless specified elsewhere) Add $J 25 pos 1,19c we pay balance Orders over S50.00 add 85c toi insurance No COO Texas Res add B'A Tax 90 Day Money Sack Guarantee on all items All ilems subject lo prior sale Prices sub|ect lo change without notice Foreign order- US funds gnly We cannot ship to Mexico. Countries other than Canada, add $4.50 shipping and handling. CIRCLE 263 ON FREE INFORMATION CARD * RE-SHOPPER 23 QUALITY PARTS • DISCOUNT PRICES • FAST SHIPPING OPTO-ISOLATORS =Cfc Clairex* CLM-6000 L E D -p ho toconducto r isolator. Off resistance: 500 ohms. On resis- tance: 500 K ohms. 2000 volt isolation. Forward voltage : 2 Vdc. CAT# CLM-60TO $2.50 each ■ 10 for $22.00 — «3^v. Sigma#301T1-12B1. Signal applied to the input is coupled by means of light to isolated photo conductive cell. High reliability switching. 12 Vdc. CAT#OP-301 $1.50 each WATER PUMP Design your own water cannon! 3-6 volt DC, piston driven, self-priming pump. Will project a stream of water or any non-corrosive liquid up to 25 feet. Motor, gears and piston in plastic housing 5.5" long X 1.03" square. Complete with 1/3" diameter input and output tubing. Squirt nozzle on output tube. CAT#WP-1 $3.95 each OPTO SENSORS Honeywell # HOA 0866-N55 U-shaped opto sensor. 1/8" gap. 4 pc leads. CAT#OSU-e 75* each TRW#OPB-818 U-shaped opto switch. 0.2" gap between sensor and emitter. CAT# OSU-9 75c each Ml PI TRW# OPB 322SD Reflective scanner module. U-shaped "t device with 4 leads each side (8 total) 0.09" gap. 0.75" mounting centers. CAT#OSU-t0 75«each TRW# OPB-708 Wedge-shaped reflective opto sensor. CAT# OSR-5 75c each Q CALL OR WRITE FOR OUR FREE 60 PAGE CATALOG WITH OVER 4000 PARTS! OUTSIDE THE U.S.A. PLEASE SEND $2.00 POSTAGE FOR A CATALOG EXPERIMENTERS DELIGHT These Atari 5200 video game controllers were returned to the dealer because of various de- fects. None of them work property, but they have lots of great parte which could be used in other projects. They include a RF video modu- lator.eight 16K dynamic RAMs in sockets, mi- croprocessors and D-A converters in sockets, two voltage regulators on a heavy-duty heat- sink and lots of other ICs, capacitors, resistors, connectors and other components all in the original chassis. Does not include the power transformer or controls (joysticks). The video modulator or the RAMs alone are worth the price. SOLD AS-IS. No returns accepted. CAT* A-S200 $7.50 each • 2 for $1 3.50 SPA THERMOMETER Originally designed for hot tub use, 50 to 1 20 degree thermometer is connected to brass probe via 10 ft of teflon covered thermocouple wire. Thermometer snap-mounts into 1 .6" hole in panel. Logo on thermometer says "Safe max 104 degrees F." Useful wherever remote temperature sensing is desired. Brass probe is 0,375" diameter X 2.97" long. CAT#THM-1 $3.50 each 64K DYNAMIC RAM HOUSE MARKED New 4164 150 nanosecond 64K dynamic RAMs. 16 pin DIP package. Originally intend- ed as add-on memory for a consumer product, these Motorola chips have been housemarked (70C1 6) and individually packaged in anti- static foam inside a plastic bag. Though they dont have 4164 written on them, we guaran- tee that they are new, functioning 4164s. SPECIAL! CAT#HN-4164 $1.25each TOLL FREE PHONE ORDERS 1-800-826-5432 ABS INSTRUMENT ENCLOSURES Molded ABS Instrument enclosures are available in ivory, beige, grey, blue, and black. Front and rear panels in matching .090" thick ABS plastic or, as an option, anodized satin finish aluminum. Integral P.C. board mounting standoffs and two sets of vertical mounting slots for front and rear subpanel P.C. boards. Includes 6-32 pan head screws and anti-skid rubber feet. All enclosures are 6" wide X 6.25" deep. Front and rear panels available in 2.25", 2.625", and 3" heights. color penal hL c*l* 1-* io-m 100 + ivory 2 1/4* MB1A $7.50 6.50 6.00 beige ■ MB -2 A " ■ ■ grey MB-3A blue ■ MB-4A H ■ ■ black MB-5A ivory 2 5/8* MB -IB $7.75 6.75 6.25 beige MB-2B blue m MB-4B ■ " " black MB-5B ivory 3" MB-1C $8.00 7.00 6.50 beige MB-2C blue MB-4C black ■ MB-5C ■ ■ ■ Satin finish aluminum front or rear panels. paitdht. calf 14 IMS 109* 2 1/4* PNL-1 $1.00 .85 .70 2 5/8" PNL-2 $1.20 1.10 1.00 3" PNL-3 $1.40 1,25 1.10 SPECIAL 12 VOLT DC COOLING FAN Rotron#NC12E3 These are the same fans we have in our catalog for $9.00 each. We just received another bad of them and want to move quantities at a special price. Rated: 12Vdc, 0.18 amp, 2,2 watts, 4.69" square plastic housing X 1.25" thick. 5 blade fan. Two 9" pigtail leads. CAT#CF-122 10 for $65.00 100 for $500.00 MAIL ORDERS TO: ALL ELECTRONICS P.O. BOX 567 VAN NUYS, CA 91408 4 RE-SHOPPER CIRCLE 264 ON FREE INFORMATION CARD QUALITY PARTS - DISCOUNT PRICES • FAST SHIPPING MOTORS 6 Vdc MOTOR Sanko* TE-325 1 1/2" dia. X 1 "long. 1/16' CAT#MOT-6 $2.50 each dia shafTOJ 12 Vdc MOTOR WITH TACH Probably used on disc drives. Buehler* 13.65 Rated 6,800 RPM 12 Vdc. Torque 3.9 in/oz. Can be used from 6 - 24 Vdc. Built in tach winding (1.8 V/1.000 RPM). 2 3/16" X 1 3/16" Shaft 3/3" X 3/32" dia with attached pulley. CAT#MOTS-A $4.50 each MINIATURE GEAR MOTORS Buehler series 61.13 Miniature DC gearhead motors. Reversible. Motor and gearhead enclosed in rugged die-cast housing. 1 .55" X 1 . < 22" X 1 .475". Long-life bronze bearings. 0.1 1 5" diameter flat- ted shaft. Two types available: 1 8 volt* dc (nominal) @ 50 ma 10 rpm @ 14 Vdc (no load) 1 7 rpm @ 24 Vdc (no bad) CAT#MOTG-18 $5.50 each 38 volts dc (nominal) @ 70 ma 274 rpm @ 24 Vdc (no load) 451 rpm @ 38 Vdc (no load) CAT* MOTG-38 $5.50 each STEPPING MOTORS Airpax* A82743-M4 12 Vdc 35 ohm dual coil, permanent magnet stepper motor. 7.5 degrees per step. 2.25" dia. X .91" thick. 0.25" dia. shaft is 0.6" long. Two hole mounting flange, 2.625" centers, 6 wire leads. CAT#SMT-5 $10.00 each Airpax# C8271 1-M1 17 Vdc 23.25 ohm dual coil, permanent magnet stepper motor. 7.5 de- grees per step. 2.25" dia, X .91" thick, 0.25" dia. shaft is 0.6" long. Two hole mounting flange, 2.625" centers. 6 wire leads. CAT#SMT-6 $6.00 each* 10 for $50.00 Airpax# C 82710 12 Vdc, 36 ohm dual coil per- manent magnet stepper motor. 7.5 degrees per step. 2,25" dia. body X 0.93" high. Mounts on 2.675" centers. 6 wire leads. CAT#SMT-7 $7,00 each -10 for $65.00 POWER SUPPLIES 5 VDC 10 AMP Computer Products* 8001 1-01-002 Open frame switching power supply. Operates on 115-230 Vac. Output: 5 Vdc @ 10 amps. Screw terminal inputs and outputs. Measures 8.375" X 5.12" X 2.2". CAT* PS-35 $1 5.00 each 12 VDC 2.1 AMP Lambda* LUS-9A-12 Fully enclosed switching power supply with screw terminal connections. Input: 120 Vac 60 Hz. Output: 12 Vdc ± 5% @2.1A overvoltage and overcurren! protection. Com pact ventilated case measures 5.24" X 3.81 " X 1 .38" overall. includes instruction sheet. CAT#PS-122 $23,50 each SWITCHING POWER SUPPLY Compact, well-regulated switching power supply designed to power Texas Instrument computer equipment. T.l.f 1053201-0002 INPUT: 1 4 - 25.2 Vac <3> 1 amp. OUTPUT: +12 Vdc @ 350 ma., +5 Vdc @ 1 .2 amp., -5 Vdc @ 200 ma. SIZE: 4 3/4" X 4 1/4" X 1 1/4" CAT* PS-30 $3.50 each *10 for $30.00 CRYSTAL SPECIAL HU-18/U Style 6mhz CAT#CRY-618S 10 mhz CAT# CRY-1018S MINIMUM ORDER 100 PIECES 100 of one VALUE $75.00 500 of one VALUE $300.00 1000 of one VALUE $500.00 fl SOUND ACTIVA TED SWITCH PC board with electret mike responds to sounds in immediate vicinity. Originally part of sound activated light organ. Output slots in board fit our motor CAT* DCM-24. Originally, when the unit was placed near speakers the motor turned, spinning some optic fibers over colored lights. Could easily be used without mo- tor for any similar application where sound acti- vation is desired. Shuts off when sound is not present. Operates on 6 Vdc. On-off switch and co-ax power jack (center positive). 4" X 1.4" pc board. Includes hook-up diagram. CAT# SAB-2 $2.50 each SOLID STATE INPUT/OUTPUT MODULES Microprocessor interface switches designed for industrial control applications. For electrically clean, photo-isolated, noise-free interfacing between logic level programmable controllers and power level loads. Input modules accept power level signals and convert them to logic level sig- nals. Output modules accept logic level signals to switch AC or DC loads to 3.5 amps. All modules fit standard I/O mounting boards and have captive hold down screws. part* btand dwcriptlon CATf Price ODC5 Opto 22 5 Vdc Output ODC-5 $5.00 OAC24 Opto22 24 Vac Output OAC-24 $5.00 ODC24 Opto 22 24 Vdc Output ODC-24 $5.00 IAC5 Cry don 5 Vac Input IAC-5 $4.50 IAC24 Opto 22 24 Vac Input IAC-24 $5.00 IDC24 Opto 22 24 Vdc Input IDC-24 $5.00 TOLL FREE ORDER LINES 1-800-826-5432 FAX (818) 781-2653 • INFORMATION (818) 904-0524 Minimum Order $10.00 * All Orders Can Be Charged To Visa, Mastercard Or Discovercard • Quantities Limited * California, Add Sales Tax • Shipping And Handling $3.50 For the 48 Continental United States - All Others Including Alaska, Hawaii, P.R. And Canada Must Pay Full Shipping • No C.O.D. • Prices Subject to change without notice. CIRCLE 264 ON FREE INFORMATION CARD RE-SHOPPER Top Rated IBM-PC shareware & public domain software $3.50 a disk (1-9 disks) - $3.00 a disk (10 or more) - for 3.5" disks, add $1.00 for each disk SimCGA - run CGA-Oniy programs onfi Hercules m on i to rs J48.49 - Imjgeprinl (2 disks) - top notch printer!! fonts for IBM/Epson printers. Many styles and sizes. M 1 - AutoMcnn - set up your PC for quick access to ^programs on your hard drive. 60 - Xlrcc - top hard drive management & access. 1 10 - Newipacc - compresses your hard drive data S'on the fly*, allowing you more space. Transparent to*" Syour programs. [116 - Anti Virus Utilities - a collection of« [programs that scan for, delect and remove viruses. [121-123 PC : Write (3 disks) - the lops in shareware^. Jword processing? Includes spell check, mail merge' yjand much more (hard drive req'd), §147 - PRO-CR - optical character recognition forffl i desktop sea nnersandsomehandscanners. $170,171 - Frocomm (2 disks) - one of the popular-; - i telecommunications programs for phone modems, ii 190-192 - PC-File 5.0 (3 disks) - the leader in? "shareware database management programs. Creates jour own database systems quickly and easily. Has*' "mail merge, reporting, label making and much morel ^(hard drive req d). , .211 - Aj Easy As. - the best Lotus 1-2-3 compatible 'that rivals AutoCAD, Many functions, (requires I HPGL plotter). 34,0 - Frintmaster Clipart - a collection of 500+ j [pictures for use with Frintmaster a nd Printshop. 392 - ForaGea - whip up forms for business and] i personal use quickly and easily, ■5&Q - Fractal a 1 - discover the colorful, chaotic] jworld of fractals. Includes Julia and Mandelbrot! [sets. (EGA req'd) itbat allow your PC to copy CW. Ill 02 - FCC Exam* - Novice, Tech & General preparation on a diskl Contains entire question [pool. Keeps track of what you missed, [1121 - ARL - Top notch (and fast) logbook- Great ! for those who make a lot of QSO's (hard drive req'd). =1149 - GeoClock - like DX Edge. Shows light/dark i areas of the Earth and moves real time (for Here/ CGA/MCGA/ATT) ■ ( note: for ROA or VGA. Call or write for our free software catalog 683,684 - C Tutorial (2 disks) - leam how to program in the popular computer language ever, 726 - Personal C Compiler - a great compiler that helps you to make professional programs in C A '1 great companion to the CTutorial- 733 - PC-Tutor - top interactive tutorial for those steaming DOS. .734 - Help DOS - TSR quick reference for DOS ';Alloftsyoutoa Iways have commandsyntax ava i lable 830 - Psion Chess • a great 2/3-D chess game - a several levels of play. ~ 1092 - PC-Track - great EGA satellite tracking Jspreadsheet program available. Fully functional. |!; program. Tracks real or elapsed time. {EGA req'd) -.1096 - Radio Mods - a nice collection of modifii 1S278 - PC-Key Draw - combination paintbrush &*■ ■CAD system. Complex but easy to use. (CGA/EGA | req'd) §279-288 - PC DOGS CAD (10 disk set) - a ? powerful and complex computer aided design system modifica lions for scan nets, HTs, VHF rigs and some HF rigs 1097 - SSTV - receive SSTV signals on your PC (req's CGA & game port) 1101 - CW Decoders - a collection of programs order llfOGcocWkiiGA) 1156 - Sky globe • the greatest in skyviewing programs. Shows constellations, stars and galaxies as ■ they appear from anywhere on the Earth! Top notch - -,you have to see it to believe it! (CGA req'd). ,1201 - STORM - The tops in Hurricane tracking! jf Map views of the Gulf or Atlantic (needs CGA or Shelter) '11249 - World 291 - nice map viewing system. View j the world from any point and V.oom' in. (CGA req'd) .1311-1317- On line Bible (7 disks) - KJV version *' of both Old and New Testament. Online browse and ^search facility. 1320 - PC Board Layout - a nice system for design of p ri nted circa i t boards. Has Au toCAD output 1321 - Motorola Database - good cross reference database program for Motorola semiconductors. 1322 - CorcDBMS - A full database for ferriteand toroid iron cores. Great for the RF related builder or experimenter. |£1330 - ACIRAN Circuit Aiilyiii - AC Linear ^^circuit analysis on a PC To order, call 1-800-525-7235 (orders only) - US/I Canada include $4 shipping per order, others please| include $8 shipping. Visa/MC/Check/MO accepted renaissance software & development killen plaza - box 640 - killen - al - 35645 (205)757-5928 - (205)757-8388 New Intelligent Averaging Mgoriihm. Piggianis e4A >n 1 D sec. . !iS in t min . 1 Meg (iTD 1 u. 1)1 1 } m : min . fi sec. 2 Meg (27C20Q1 1 in 5 mm Internal cam with external 40 puiZEF. Reads, verities, and programs 2716. 32. 32A. 64. MA, 128, KBA. 256. 5 1 2. 51 3. 01 0. 01 1 . 301 . 27C2001 . MCM 6S764, 2532 Aulomtlictlff sets atvgttmmltiQ voltage L wd and save butler tn disk Binary. Intel Hex. and Motorola S formats Upgntible lo 3! Mis IPHOMs lid persanetity modules required t year warranty - 10 day money back: guarantee Adapters available far 8748. 49. 51 . 751 , 52. 55, TMS 7742. 27210. 57C1024, and memory cards MademU.S.A 2 It. Cable « pin ZIF NEEDHAMS ELECTRONICS 4539 Orange Grove Aw. ■ Sacramento* CA 95EH1 Mcn.-fri. Etam-EpmPST COD Call for more infornn-aliori (916) 924-8037 ■ FAX (916) 972-9960 CIRCLE 279 OK FREE INFORMATION CARD YOUVE SHOPPED THE REST, NOW BUY FROM THE BEST!! JERROLD 400 DRX-3-105 $4020* SINGLE $55 PANASONIC ■ 550 MHZ ■ PARENTAL LOCK ■ LAST CHANNEL RECALL ■TIMER $69 20 + $95 EA. QUANTITY MODEL 1 10+ 20+ SB-3 $60 $50 $45 TB-3 $95 $75 $69 DRX-DIC $125 $95 $85 CALL: ZENITH, OAK, MORE JEROLD EQUIPMENT SALES, INC. 7094 MIRAMAR ROAD. BOX 1 18 - SAN DIEGO. CA 921 21 SALES OFFICE 1-600-676-7966 Technical Assistance or FAX: 619-693-7966 CIRCLE 276 ON FREE INFORMATION CARD 26 RE-SHOPPER ( ^lltek Computer COMPUTERS • PRINTERS • COMPONENTS SYSTEM SPECIALS AT 386 AT 386SX 25 MHz 80 Meg HD VGA Monitor $ 2150 16 MHz 40 Meg HD Mono Monitor $ 1250 AT 286 12 MHz 40 Meg HD Mono Monitor $ 895 EACH SYSTEM INCLUDES 1 Megabyte RAM TEAC 1.2 and 1.4 Floppy Drive AT Case w/Power Supply Monitor (14" S VGA/12" Mono) KEYTRONICS 101 Keyboard Video Controller (512K RAM on VGA) 1:1 Hard Floppy Controller 2 Serial/ 1 Parallel Card HARD DRIVES NEC 3142 44/66MB 24MS *315 WD 44MB 28MS ODE) , s 290 Quantum 80MB 19MS (IDE) $ 510 Conners 100MB 24MS (IDE) $ 550 VIDEO CARDS Paradise OEM 512K *140 Genoa 6400 512K $ l60 Tseng Lab OEM 512K $ 140 Orchid Pro Designer II 512K..... $290 MONITORS MITSUBISHI 14" 1381 Diamond Scan s 499 POWER II 14" S VGA 1024x768 .28DP s 389 14" VGA 640x480 .28DP $ 350 SAMSUNG 12" Amber Mono Monitor $ 79 14" VGA Monitor s 365 MISCELLANEOUS MOTHERBOARDS 386/33 MHZ 64K Cache s 950 386/33 MHZ 64K Cache s 850 386SX/16 MHZ $ 390 286/12 MHZ s 135 Local Area Networks XT to AT Upgrades 1.2 TEAC Floppy s 80 1.44 TEAC Floppy *80 360K TEAC Floppy *63 AT I/O 2s/lp/lg s 30 2400 Baud Modem $ 79 Other items available. Call for pricing information. Repairs & Installations Limited Full One Year Warranty Quantities AC 359 W. El Carnino Real Mt, View, CA 94040 M-F 10-7:00 Sat. 10-4:00 Call Jim Meredith or Tim Gillies 1-800-745-8984 RE-SHOPPER 27 GRAY MATTER COMPUTING XT SYSTEM: 8088-10 with 640K, 360K Floppy, 2 parallel, 2 serial, 1 game port, 1 01 keyboard, clock/ calendar, monographic card & monitor. $399.00 AT SYSTEM: 286-12, 2MB RAM, 1.2 Floppy, 2 ser, 2 par, 1 game, 101 keyboard, 1:1 hd/fd Controller, monographic video card & monitor. $699.00 386-25/64K Cache system includes 2MB RAM, 1.2 Floppy, 1 :1 hd/fd Controller, 2 ser, 1 par, 1 game port, 1 01 keyboard, 1 6 bit VGA Card & monitor. $2085.00 We will happily configure a system to fit your needs. WHY US Customer satisfaction is our primary goal. We know that you need knowledgeable support as well as prompt service. Here at Gray Matter, we take pride in providing these and more at a competitive price.And we enjoy it That's why. 1 :1 AT MFM HD/FDControlIer $75.00 1:1 ATRLL Combo Controller $99.00 XT MFM & RLL Controllers $51 , $59 360K & 1 .2MB Floppy Drives $60, $75 720K & 1 .44MB Floppy Drives $65, $75 CMS Jumbo Tape Backup $275.00 <# 40MB MR535 MFM 28ms RLL cert $325.00 72 MB Maxtor XT1 085 FH 28ms $625.00 1 00MB CP31 04 IDE (AT) with kit $655.00 200MB CP3204 IDE (AT) with kit $995.00 XT 4.77/10 MHz Motherboard OK $60.00 286 VLSI Motherboard 12MHz OK $1 10.00 ALUMINUM RACK AND CHASSIS BOXES FEATURES: DESIGNED FOR SMALL LOT PRODUCTION EASY TO FABRICATE (DRILL OR PUNCH HOLES) SHIPPED UNASSEMBLED (FLAT) ALL MAIN PANELS ARE FLAT FOR EASY FABRICATION FRONT AND REAR PANELS ARE CLEAR BRUSH ANODIZED TOP AND BOTTOM PANELS ARE BLACK BRUSH ANODIZED END PANELS ARE BLACK ANODIZED CHASSIS BOXES MODEL* WIDTH DEPTH HEIGHT PKfCE MC-IA 4" 3" r% 15.00 MC-2A 6" 3* T 17.00 MC-3A 8" 3" 2" 19.00 MC4A 4" 5" 3" 17.00 MO 5 A 6" 5- 3" 19.00 MC-6A 8" S* 3" 21.00 MC-7A 4" 7" 4" 19.00 MC-8A 6" 7* 4" 21 00 MC-9A 8" 7" 4' 23.00 ORDER DIRECT FROM THE FACTORY ON PREPAID ORDERS SHIPPED UPS GROUND, SECOND DAY AIR $10.00 NEXT DAY AIR $20.00 CALL FOR COMPLETE catalog anji ENGINEERING IKMEM5IONS; WE ALiO SfOCK CHASSIS PUNCHES AMI! 1NS1ANI LlilTMIINC CALL fOK TATALOr, SESCQM.INC, - 2100 WARD DR. HENDERSON NV. 89015 U.S.A. MODEL RU5 IRU7 IRUIO 2RU5 2RU7 2RUI0 3RUS 3RU7 3RUI0 KU 1 .75" 1.75" 1.75" 3.50' 3.50' 3,50' 5.25" 5.25" DEPTI 5" 7" 10" S* 7" ID" 5" 7" _1P1 PRICE 5 29.40 31.50 33.60 31.50 33. GO 35.70 39.90 42.00 -»-' "' m 800-634-3457 (ORDERS ONLV| - 702-565-3400 (TECHNICAL HELP) ■ FAX 702-565-4828 CIRCLE 278 ON FREE INFORMATION CARD 8 RE-SHOPPER COMPUTER DISK SERVICE SPECIALIZED DRIVE REPAIR REPAIR 1425. 3435.3139 i$l20°° ssss* . *Peci, ' w **nL • Class 1 00 clean room • Servowriting capabilities (Call for prices) • Volume discount • 6 month warranty on all repairs • 7-1 day turn around time • 24 hour turn around - ADD 30% • Ask about our data recovery (Call for quote) COMPUTER DISK SERVICE 3537 OLD CONEJO ROAD, SUITE *1 1 5 NEWBURY PARK, CA 91320-2157 PH (805) 499-6355 FAX (805) 499-0346 Amazing Pocket Reference! 480 pages of tables, formulas, & conversions and it fits in your shirt pocket! (Size 3.2" x 5.4" x 0.6") 7^e ) Total Shipping & Handling per Order 1 book = $2.00 2 books =$4.00 3 books =$4.50 4 books =$5.00 5 books =$5.50 6 books = $6.00 7 books = $6.50 8 books =$7.00 9 books =$7.50 10 books =$8.00 11 books =$8.50 12 books =$9.00 13 books =$9.50 >14books=$10.00 Address: City/State/Zip; Payment enclosed (mark one): Check Card #: Company:. Phone:/, ]_ Money Order Visa Exp. Date: MasterCard Signature:, Colorado Residents add 4.7% sales tax on the book + ship- ping total. The Book Source, Dept 956, P.O. Box 620820, Littleton, CO 80162 TOLL FREE ORDER LINE Ml • (800)873-7157 CIRCLE 266 ON FREE INFORMATION CARD RE-SHOPPER 2! Linear xc»s 1 EACH IIP LK324,LH33?,LmO f N£555, LK723, ?«,«C1310,L»1BOO.B PIECE ISS'i- KM -TRAMS XSTORS ASSORTMENT INCLUDES ZH2222,2«3B55, 2*3904, 21(3906,2114401 PLUS MKH HOKE T0-S2J0-5 MED TO -220 STYLE, 25 PIECE ASSORTMENT- *2 1_YT X OS KS5MTHEKT CONTAINS Uf,4.?ttf ,lDnf,22uf, 47u( J tDO t iT,22Oif,470s*,10O0«f,220O«f MR) MORE. FULL LEAI5/VOLTA6ES VARY. 25 PCS/S2 TAMTAI—UMS ASSORTMENT OF BIPS,SOLIK,RAI/AX. VALUES IHCLUK M , 3. 3tf , 4. 7i( , lOtf , IStf , Z2»t, 47ttf MB NOSE. 40 PIECE ASSORTMENT- 14 SOCKETS l« MOTtf-ASSMTIHIT IKLUKS 2 EACH 8,14,16,18,24 AM 40 PIN. 12 PCSJtl VIK VI^ASSORTKHT 1NCLUKS 1 EACH B, 18,20,22,24,28 AKB 40 PIN. 7 PIECES/$4 DIODES 100 PIECE ASSORTHEHT IKLUKS SDK EACH 1M4004 > 1N414B,1N4735,1N474V AN! MORE. SOKE IEHERS HOUSE HUHIEREB. 100 tt2 t> IOI TAL fC'3 25 PIECE ABSBRTHENT OF 7400, 74LSXX, 4008 CWS, 74SQX SERIES IC'S 1KLUI1K POPULAR DEVICES 7447, 74LS373, CI4013, 74SC374,AKt MUCH NORE, 25 PIECE ASSORTKHI- $3.95. RESISTORS 1,000 PIECE RESISTOR ASS'T-KINIMUM OF 50 DIFFERENT IYPES.M0STLY 1/4 AW 1/2 WOT. SOME 1/8 AND A FEU 1 AMI 2 UATT.8UARANTEEI TO CONTAIN 1K,10K,100K,AN9 MANY, MANY MORE POPULAR AMI USEFUL VALUES INCLUDING PRECISIONS. COMPETITION 1ASHIN6 PRICE tt.95 REGULATORS ONE PIECE EACH LM3Q9K , NC337T , 7805, 7BL0B, 7812,7905,7912,791s. 8 PIECE ASSORTMENT $2 RELAYS-IOPC ASS'T.K.50 W£'R£ LOOK INS FOR A FEU BOOD CUSTOMERS t / / » / .' .' .' .' ATTENTIOM SCHOOLS i Nl CM -KANT HILL EXPERTLY PACKAGE LAI KITS FDR YOU. CATALOG / MA I L -S EHI AN ORDER AND VE WILL INCLUDE SPECIAL OFFER LIST. IF THESE IS N0TNIN6 IN THIS Al FOR YOU, YOU BOH'T NEED OS! NO CATALOG COLLECTORS PLEASE. [SW I TCHEE ASSORTMENT IKLUKS SLIMS, T0S6LES, ROCKERS, AMI PUSH BUTTONS. 15 PIECE ASS'T- t\ TR I MROTS ASSORTMENT INCLUDES VIDE RANGE BF STYLES /VALUES. 25 PIECE ASSORTMENT- 12 T> I SCS ASSORTMENT FROM I.Spf TO * 33I1.HIHIM1 15 1IFFESFJT VALUES. 50 PIECES FOR (1 MVl_ARS ASSORTED BIP.NETALIIEl AMI FOIL MYLAR CAPS. VALUES UP ID .mi. 35 PIECES FOR 12 ;i_ I 3DE F^OTS 10 PIECES ASSORTED- tl LED * S ASSORTMENT OF STANDARD AM ROM STANDARD STYLES. 50/14 TR I MCA 10 VARIABLES ASSORTED- £ prist WITH FREBUEKY.GAP, HFE FUNCTIONS .COMES COMPLETE WITH PROTECTIVE CARRYIK CASE, SPARE FUSE, TEST PROBES, BATTERY. EXTERNAL CAP ANI TRANSISTOR PROBES OPTIONAL AM M.95 EACH EXTRA 3 MODEL #905 $68.75 IICRO — MART < TEI_ = 20 1 efiS-4 6008 > 7fM- CHECK, MONEY SOS CENTRAL ORDER , VISA/ MC . «10 MIN. ORDER. COD REGULAR CUSTOMERS WESTFIELD.NJ 07Q9Q ONLY. SHIPPING-U. S. »3, CANADA «4. NJ RESIDENTS ADD 7%. CIRCLE 292 ON FREE INFORMATION CARD TECHNICAL SCHOOL CLOSED! Silling hundreds ol HEATH Co. last and training equipment at up la 60H oft their catalog price*. Use Heath catalog lor description. Condition: new to slightly used, many without manuals. All professionally wired & tested, or In left lorni H noted. First come, first served. Check or major credit cards. Sorry, no COD or open accounts. Add M.oO Mailing I Handling. HUTti TEST EQUIPMENT IM52I7 Betleiy Operated V.O.M., Wind ».S0 IttS&S Valium Tube Wrrieler, Wired 7950 IT2250 Auto Rame Caparilor Tail. Wired 83.50 IT3I20 SanicHidjckx Checker, Wind 59.50 PXWIOS Mine 1 ».1 (kmt» Prob* Kit 1 9.50 SKI 01 1 2 YDC-3A Powsc Supply 39.SO 1271 Flaiclai Generator 69.50 1274 aUHzSweeplPu'K Generator 1)5.00 1277 Pulse Bmenk> 147.00 2320K Hai*«H 3 ,S Knil D MM S 1 4HJX 2J20W Handheld 3i Hal DMM Wired 59 X 2420 Mae Universal Counts 255.00 271 7A R eg. H .V. Power Supply 1 65.CC 2760 B-15V Battery Bimiialor 129.50 2760K S-15V Battery Hmrato Kit 51 Ki 42COA Laur Trailer, Wired 225.00 4200K Laser Trailer, 101 195.00 4225 Dual Trace 25 WHiOsdlcsccpe 375.00 4226 Dual Trace 25 MHr Osdloseope 385.00 HEATH EDUCATIONAL SYSTEUS ET100 WctoompJIer Trainer 395.00 ETB3300 Bread Board EifetifMnI MdAie $9.50 ETB6201 Kg. EiperrwiiCirciitBri Module 63.50 ETWI0O0 AiwJcj.'DiritalCid Trainer 185.00 ETW31O0 EtedroricDewn Experiment* 18.50 ETW3200 Digilal Design Experimenter 69-50 ETW330O Bread &nrd Trainer. Wired 59.50 ETW3567 Trainer Accessory Back Pack 79.50 ETW3600 Analcg Esucaitnal Trainer. Wiied 88.50 ETW3700 DigiUfTecWcjjee Trainer, Wked 88.50 EWC100 Dual 5.5- Disk Drive 15B.IO ZVMI33 Termiial lor ET1 00 Above 245.00 urscntAAfous HP-15C H.PSoenbEc Calculator t Hand Book 4950 US3 Oki-DauMicraine Printer 95.00 545A Hewlett Packard Logic Prcbo 89.00 546A Hewlett Packard Logic Pulsor 149.00 547A Hewlett Packard Current Tracer 246.00 548A Hewlett Packard Logic Clp 125.00 700 T-ISIent 700 Porlabta Data Terminal 89.50 5022A Satof4H-PTestersinCarryCase 59500 In-Cicusl'eslng.J.Balesm 14.50 Industrial Vendaa'cn 19* EdtSon tS.50 HEATH ISARHNG COURSES Note: The imjl kitTo! c with manuals are not exponent par tiueualy supplied available and prices relect Sits omissicn. Al courses are new, and wim exan EEI01 EE10-3 EEI03 E61M EE105 EEI10 S El 001 EE1002 EE10O3 EE10O4 EE3I40 26.50 19.50 22.50 29.50 29.50 39.50 26.50 49.50 49.50 49.45 39.50 44.50 FJjsr Opfce Leaminj Ccursa 39.50 LabExperimensDigilalTechw/Gkiide 1830 AcVd hforapioceaacfa Course. 2 Wet 5930 DataCem, 6 Network, 2vd. 68.50 TTUCMOS Cicuits 2930 ■ :atiohal BOOKS CperebuneJ AmpSiers Active Filers Course I.C. Timers Course Phase Locked Loops Course Optc Eledrcrics Course I'.^y.t Tecnncronjes Course Passive Circuit Design Course Transistor Cacuk Deeion, 2 vol. AjialccCircul Design Digfc/CiroilD«k3n.2vcl. Concepts ol Elecronics, 2 vol . EE3201A Digital Techniques Course. 2 yd. EE4201 ' EE6201 EE30&S EE8000 EH702 These books arebrand now a represent a saving am tiUfthers list Bices, All hard bound sxceplas noted. asyCoursePrograrnmingH-PllCalSC 15.00 TTL Cook Book, [messier (sot) , Sams 5.95 Assembly Language Program (soft), Intel 0.95 Electrid ty1-7.J*ieaf,Haydm 1S30 Dedsicn Making Under uncertainty. Hull. P-Hal 9.50 Ftndenentatlol DtrJU Bectoiics, P-Hal 1930 Ccnojse tiro to Engineering Eooncmics 1230 smmMssiiimj, Gorb Basic Elscironcs. 5th Ed. 1030 Sofware ReiaMily. Musa lamiiB 1030 Into to Uni Systems, Byers. 5th Ed. {soft] 9.50 Dm M Bei*onics,Tokheim2ndEd.(solg 6-9S A Reference Guide to Placical Beckoncs (soil) 3.75 uigitaF Becfrcncs thru £ uperimenu 5.95 Experiments ii Elsctrorsc Devices. 2nd Ed. 9-50 Elecsonic Down, Royd. 2nd Ed. 2430 Digital Eiperimtrts-Trcubie sfxot, Cor (soil) 8.95 Experiments Electronc Crcuits. Stanley. 2nd 9.95 Piinookwol ElecliOlic Grows, Floyd. 2nd Ed. 12.95 Piin^sol Electronic Grouta. Floyd, 3rd Ed. 1930 Digital Fundamentals, Royd. M Ecf. 1230 1755 Osgood St., Norlh Andowei, MA 0184$ ORDER TOLL FREE; 800/M3 14S5 NUDE! f NUDE! V NUDE! «' L» NAKED WORKSTATION CASE & POWER SUPPLY At the scandalously low price of only $59.95 for both! fS" It's brand .new.. .it just isn't wearing a plastic front panel, bezel, key switch or LEDs. Featuring: ■ 230 watt 110/120 power supply (AT style, back switch}! ■ Eight (S) '/2-height slots for drives (6 front, 2 back) ■ Accepts eight (S)-slot mother board (full or baby} ■ Extra 12-volt cooling fan ■ Speaker for mother board ■ Six (6) rail sets included ...With all this, it's worth twice the price! And more bargains... SWITCHING POWER SUPPLY Only $9.95! Fully enclosed with switch and D.I.N, power connector. ■ 5v at 4.5 amps ■ -12v at 3 amps ■ 12v at 1.4 amps ■ +12u at 12 amps Electronic Parts Outlet • 2815 Fondren • Houston, TX. 77063 (713) 784-0140 • FAX: (713} 784-9740 Three locations in Texas... .Come visit our retail stores! CIRCLE 280 ON FREE INFORMATION CARD 30 RE-SHOPPER AMAZING ELECTRONIC PRODUCTS and KITS 100,000 VOLT STUN GUN INTtMIDATOR, Construct your own high energy personal protection unit. * Intimidating effect up to 20 feet away^ • Research into muscle building ST6ZK Kit B Plans ..S ^^P ".$69.50 ST6Z0 Assembled tested .,.<. ^^... .5129-50 Miniature FM WIRELESS MIKE {3 Mi) Construct a device that transmits v sound to your FM radio, over ^g-jVr ccnsiderable distances fcSisEii ■' -T: v ■*£& (up to 3 miles) ~3j • Be a neighborhood disc jockey jf\ ■ M on itor chi I d re n/inval ids *^~JlJI • Build a security system FMV1 Plans S6.0B FMV1K Kit & Plans ...S39.50 Invisible PAIN FIELD GENERATOR Shirt pocket sized electronic device produces time varient complex shock waves of intense directional accoustic energy capable of warding oft agressive animals, etc. IP67 Plans $8.00 IP67K Kit & Plans $49.50 IP670 Assembled testesd $74.50 SEE IN THE DARK VIEWING Device uses invisible infra red illumination for seeing in total darkness. Excellent application of night vision, along with observing lasers and other IR sources. Functional unit. Has many useful applications. • Excellent science fair project • Featured front cover "Radio Electronics" August 1985 SD5 Plans $10.00 SD5K Kit & Plans $299.50 TELEPHONE TRANSMITTER (3 Mi) Automatically transmits both sides of a telephone conversation to an FM radio. • Tunable frequency • Easy to build & use • Undetectable on phone * Up to 3 mile range ■ Only transmits when phone is used VWPM7 Plans $6.00 VWPM7K Kit S Plans $39.50 AUTOMATIC TELEPHONE RECORDER DEVICE Automatically records both sides of a telephone conversation onto a tape recorder • Requires no power ■ Easy to use ■ Sub miniature * Extends normal tape time TAT3K Kit S Plans (14.50 TAT3D Assembled $24.50 ELECTRIC MAN/ION RAY GUN Become an electric man! Construct a novel device that transforms your body into a walking power source. • Energize lights, objects and "other people " ■ Demonstrate feats of magic and mystery. ■ Enhances "apparent" telekinetic motion. EMA1 K KM S Plans $69.50 1063K Kit & Plans [Gun Configuration) $69.50 SEE IN THE DARK IMAGE CONVERTER TUBES Full Spec RCA 6032A 6032A & System Plans ".....$89.50 «=SB. LASER LISTENER Hi-tech space age listening device that allows you to bear sounds from a source requiring no access. Data shows how to use our LLIS1 Laser Lite Detector and VIU2 Laser Lite Gun described on this sheet. CAUTIOM - this data is for educational science projects only. Check local and state laws before implementing Advanced science project. LLIS1 K Kit & Plans includes LLFt I/VRL2 $1 99.50 GIANT SOLAR CELL Demonstrates free energy from the sun. Shows how to make a solar battery capable of doing actual useful work. * Includes Plans to a Solar Battery SOL1 Giant Solar Cells 4" 2 amps $7.50 W— 5mw VISIBLE RED LASER DIODE SYSTEM All new up to 5mw Highly Visible Red Laser utilizes some of our unique circuit tricks that allows switchless operation and non contact charging of the internal nicad batteries. Shirt pocket sized system proveds up to 5mw output and includes colli mating lens. Circullry is being featured on front cover of Radio Electronics magazine November 1990. This laser is a real performer VRL2 Plans .$10.00 VRL2K Kit & Plans (3mw diode) $158.50 VHL20 Assembled (3rmv diode) $249.50 TABLETOPTESLACOIL • Spectacular and Fascinating • A real attention getter! • Energy passes through windows! • Great for science projects, displays, stores advertising. ■ Featured in Spring '84 Special Projects by Radio Electronics Highly spectacular device produces visible audible bolts of lightning appearing to flash into the air. Cause certain materials to burn from within and glow, lights bulbs without wires, produces induction fields, St Elmo fire corona. Clearly demonstrates high frequency, high voltages yet terminal may be louched by user during operation with a metal object. 1 15VAC operation only. BTC3 Plans S1B.DD BTC3K Kit 8 Plans $249.50 BTC30 Assembled $349.50 WORLDS SMALLEST TESLA COIL Produces 50 to 75.000 volts of lightning-like discharges capable of generating "plasma in a jar", St. Elmo's Fire, Corona or being just an excellent conversation piece. Unit contains power control and discharge terminal. Excellent lab or science project, BTC1 Plans BTC1K Kit & Plans BTC10 Assembled & tested 115 VAC powered unit, requires caution $7.00 ..$49.50 ..$69.50 ELECTRO MAGNETIC LAUNCHER This device clearly demonstrates the magnetic and mechanical reaction produced by the "Lorentz' force. This is the basis of presenl research being done on rail and coil guns. weapons, or vehicle launching. Great research and controlled science lair project. Propels object to considerable distance using a discharge of 160 joules. Caution required, unit operates on115VAC. EML1K Kit & Plans $59.50 EML1D Assembled $99,50 PLASMA FIRE SABER Produces the spectacular effect that captured the fantasy of millions o( movie fans. Visible plasma field is controlled by grip pressure & adjusts saber length. Active energy held produces weird £ bizarre effects Excellent for special effects Available in photon blue/neon red/phasor green/starfire purple PFS2 Plans $B.OO PFS2K Kit S Plans $49.50 PFS20 Assembled $69.50 DECOR HI LITE NEON 25' display length. Available in choice of fire red, phasor green, photon blue. Operates from 12VDC or 115V AC. Produces a bizarre strobing effect when light is in motion. DNE1 Plans $6,00 DNE10 Assembled $49,50 MUSICAL NEON DANCING PLASMA FIRE- RHAPSODY IN LITE Highly visible plasma length varies with the volume of sounds and music. ■ Supplement to home stereo ■ Amusement for bars & entertainment areas • Attention getting for point of sales • Available in fire red, proton blue or phasor green DPL1 Plans $8.00 DPL1K Kit & Plans $59.50 DPL10 Assembled ...$79.50 -HARD TO FIND PARTS - VG20 -High Voltage 2DKV Avalanche Diode S3. SO VG4 - High Voltage Sub Mini 4 KV Avalance Diode 579. 50 .001 ftSV- High Voltage .001 AT 15KY Capacitor S79.50 TUOI - Special Tunnel Diode & Plans lor the Famous Martini Olive Voice Transmllter 529.50 1 K/25 - H tg h Voltage 1 0kV 25MA 60HZ 1 1 5 AC Transformer 569.50 CD25B - High Voltage 50KY Mini Pulse Transformer ... .116,50 108 - HigTi Vultsge S" High Taiaidal Terminat 569.50 Fans - Mulfin Fans 11 5 VAC Eicellem Condition S5.50 XLD660- 15 WATT Laser Diode with Plans 519.50 VISIBLE RED LASER DIODES^ 01 "^ B70NM Toshiba all new full spec ' \ A^ VR01 3 MW Laser Diode & Plans to Build a Complete System $74.50 INFORMATION UNLIMITED DEPT RES10, BOX 716, AMHERST, N.H. 03031 WE ACCEPT MC. VISA, COD. CHK, PLEASE AD $5.00 SHIPPING & HANDLING ORDERS: MAIL YOUR ORDER, OR CALL TOLL FREE, 24 HRS. A DAY 1-800-221-1705 OR FAX 24 HRS A DAY 1-603-672-5406 FREE CATALOG OF MANY MORE ITEMS AVAILABLE ON REQUEST. RE-SHOPPER 31 "AT" CMOS SETUP RAM. MC146818 (CDP6818) $2.49 ea. This device also includes the clock calander and alarm functions. CMOS TLC555 $0.69 TIMERS TLC556 $0.99 AUDIO AMPS: TDA2002 (6W) $0.99 (T0-22OCASE) TDA2030 (UW) $1.49 ALPHA-NUMERIC LED ARRAY J5522J 7x5 LED Matrix. Foe Moving ***** Message Signs, Eta By IEE. ***** # 2057 - c/c rows. Your Choice: 5255$ I # 2058 - c/a rows. d-olS M With Hook-Up (SIZE: 2 X 1 .5 In) ** ea> (8 For $17.95) RARE SURPLUS FIND! NEW1 12VDC POWER RELAYS #1 by OMRON. DPDT 10 A. conl. 150 ohm coil 1x1 .5x75 inch. $2.95 ■■ #2 by P&B. SPST-N.O. 30 A, cont. 160 ohm coil 1.5x1X.75 inch. $1.99 ea CRYSTALS $1.25 1.843 2.000 2.457 3.120 3.579 3.680 4.000 4.915 5.068 8.000 10.000 11.059 14.318 20.000 ALL IN MHZ CALL FOR OTHER FREQUENCIES! SIEMENS SMART LED ARRAY I 5x7 Red. Built in logic ! #DLO-7135 Requires only a chip select and an ASCII Input. Operates on 5 VDC. 1 inch tall. With Data. New Units. Displays entire 128 char, set I $3.95 each or 8 for $24.95 CAPS FOR HAMS t High Voltage I Very Dangerous. 110 MFD 450V AXIAL $1.99 800 MFD 450V CAN $4.95 51 00 MFD 350V CAN $6.95 ALL NEW. NAME BRANDS! HARD TO FIND. 6 V. 4 A.H. BATTERY Cell Cell style. Brand New fresh units. 4x3x2 inch. Tabs on top, $6.95 ea CAPS FOR POWER SUPPLIES 9200 MFD 50V....RADIAL $0.99 12,000 MFD 75V....CAN $3.95 21 .500 MFD 40V....CAN $2.95 41 ,000 MFD 35V....CAN $3.95 47,000 MFD 25V....CAN $2.95 105,000 MFD 25V....CAN $2.95 STEPPER MOTOR $3.95 IBM Surplus. 8 wire. 4 windings. 7V @ 350 mA 1.8" (200 steps per rev.) DC. res. 20 ohm ea. 25 oz. In. torque. Works great on 5vdc. W/Data FOR ROBOTICS TRIAC: BT1 39-500 12 AMP 500 PRV. TO-220 $0.99 CMOS 8032 MICROPROCESSOR 80C32 By Matra. 40 pin DIP 12 MHZ. Very low power. $3.95 PLASTIC TRANSISTORS: 6 FOR $1 2N3904 PN2222 2N4124 2N3415 2N3908 PN2907 2N5401 2N3417 2N4401 2N3565 2N5172 2N5089 2N4403 2N5086 2N6517 2N3392 2N4125 2NS551 MPSA06 MPSA56 CMOS EPROMS 27C32HQ (house #).$1 .49 27C64-2 (Intel).. $2.99 27C256(TI) $3.50 27C512(TI) $4.95 STATIC RAMS 6116LP-15 $1.95 6264P-15 $2.95 62256LP-10 $6.95 2114 $0.89 7198-S45P $1,99 VOLT. REG. ICs 7805 $0,49 7812 $0.49 7815 $0.49 7824 $0.49 7905 $0.49 7912.....$0.49 7915 $0.49 7924 $0.49 LM350T $2.95 LM317T $0.69 LM337T. 78H12... 78H05 ... 723 ...$0.69 ...$4.95 ..$3.95 ,..$0.49 LM338K $4.95 SG3524 $1.25 SG3526 $1.25 LAS6350...S1.49 LM309K $0.99 LM350K.....$3.95 TL494 $1.19 TL495 $1.19 TL497 $1.49 TO-3 POWER TRANSISTORS MJ2955....$0.99 2N4398....$1.49 2N3773....$1 .49 2N6547....$2.49 2N3055....$0.89 2N6056....$1.49 2N6254....$1.49 2N3771 ....$1 .95 2N5038....$1 .95 2N5881 ....$0.99 2N3772..,.$1.95 2N6308....$2,49 2N5879..„$0.99 TANNER ELECTRON ICSl 21 4-242-8702 FAX: 21 4-709-5041 1301 W.Bellline Rd. #105 Carroilton. Tx 75006 (Store prices vary) FULL WAVE BRIDGES 1.5A 400V $0.49 2A 200V. .....$0.49 10A400V $0.99 35AS00V S2.95 XEROX LENS 4-element, coated. F:5.7 lOin. F.L. $5.95 fixed aperture ol 1 .75 in. urw TRIAC DRIVERS MOC3010 MOC3040 MOC3011 MOC3041$ Q9 9 LINEARS OP07 (DIP)... $1.49 TL062 (house #) $0.49 TL072 (DIP) $0.59 LM324 (DIP).. $0.49 LM358 (DIP) $0.49 LM348 (DIP) $0.59 MC4741 (DIP) $0,59 LM318 (DIP) $0.99 LF356 (can) $0.89 5532 (DIP) $0,99 5534 (DIP) $0.99 MC3403 (DIP) $0.49 TLOS4 (DIP) $0.99 RC4558 (DIP) $0.49 4136 (DIP) $0.69 LM339(DIP) $0.49 75491 (DIP) $0.49 75492(DIP) $0.49 ULN 2003 (DIP) $0.69 LM3900(DIP) $0.59 LM2900(DIP)„. $0.79 XR2240(DIP) $0.99 DIP TTL OSC. We carry most common frequencies. Call. $2.49 ea TERMS: Send check, or use, Visa, MO NO COD. USA.Canada Only. Add $3.85 min. tor UPS. Texas add sales tax. 90 Day limited warranty on all items. $1 5 min. Toner Cartridge Recharge Kits— Supplies— Service Everything you need to recharge toner cartridges used with Canon based laser printers and personal copiers. Use with HP: LaserJet, LaserJet Series II, IID, III Apple: LaserWriter, LaserWriter IINT.IINTX, QMS: Kiss, PS-8O0, PS-810, Canon: LB-P8A1,A2,II, Cordata: LP-300X, etc. With our Kits— Supplies— Service you can start your own profitable recharge business or just recharge your own cartridges. Model Recharge Kits/Supplies Dealers Please Call TR-300 Recharge Kit for CX type laser printer engines. $Z1.95 TR-302 Recharge Kit for SX type laser printer engines. $26-30 TR-304 Recharge Kit for HP IIP (LPB4) laser printer. $21.95 TR-325 Recharge Kit for PC-10/1 2/14/20/24/25 copier. $25.50 TR-370 Recharge Kit for Sharp Z-SO/55/70 copier. $34.95 4080 Replacement Toner Kit for Ricoh 4080 laser. S49.95ea/6 6000 Replacement Toner Kit for Ricoh 6000 laser. $ 16.25ea/6 801 1 200 grms of high quality black toner for CX. $9.95ea/12 8056 250 grms of high quality black toner for SX. $12.50ca/12 SOlMJlue/Br 200 grms of Blue/Brown toner for CX & SX.$22.95ea/12 8057 150 grms of high quality black toner for PC $10.95ea/12 Felt-CX,SX replacement treated felt for all models. $0.90ea/12 SS-CX.SX seal strips for sealing in toner for reshipping $0.85ca/12 DPP Drum Padding Powder (pixie dust) $12.95 EvcrDnun™ OPC drum life extender agent. 40+ applications $41.95 C2093 Hoover Toner Vacuum with attachments. $149.95 Instructions Available Free to Customers! Call 800-221-3516 ask for our catalog. CP CHENISKO PRODUCTS Chenesko Products, Inc. 62 N. Coleman Rd., Centereach, NY 11720 Call: 516-736-7977, Fax: 516-732-4650 TflOttVU Videophone in a Chip STILL FRAME TV PICTURE TELEPHONE TRANCEIVER KIT Sends Slow Scan XV pictures over The phone line In Twelve Seconds ;amera, Camcorder VCR. NTSC Video output and holds trie display and sends on command Auto Mode allows hands free send and receive. Displays on any TV IC Chip Replaces ISO SSI Dips 50 Levels of Grey Scale Serves as: TV FAX C Camera - Phonvu TeL Line 200 x 242.5 High Res. 50,000 Pixels Mon. Modulator Use VCR Mod TV Videophone Chip and Schematic A/D, DRAM, D-Reg. PC Board (BARE) 50 Res. Cap. Diode Cabinet (uncut) Power Pack KIT PRICE: ASSEMBLED 3. uiooe iCUt) ^to 48P DIP $59.95 $35.00 $16.95 $28.75 $12.75 $6.75 $ 164.15 $ 23500 CIRCLE 283 ON FREE INFORMATION CARD EEEand FAX Order (213) 827-1852 Piia Electronics Box 11148 IVI Lr Marina Del Rey. CA 90292 CIRCLE 282 ON FREE INFORMATION CARD > RE-SHOPPER KITS DESIGNED AND MADE INU.&A. PIEZOI G756 AL THE ELECTRONIC GOLDMINE \ MINIMUM ORDER: £10.00 plus $3.00 Shipping and Handling S ^_ We accept MasterCard, Visa and Money Orders # \ Call or send for our free catalog! X P.O BOX 5408, Scottsdale, AZ 85261 x PHONE ORDERS: (602) 451 -7454 / ■CTRICFANl $.7.95 ,*SV7ti • SPECIALS • 12VDC IC FAN $9.00 One of the neatest new scientific breakthroughs! It is a fan that operates on 1 10V/60Hz AC and uses a traction of the energy that standard rotary types use. It is compact and has no rotating parts to wear out! Deli vers about 7 cubic Ft/minute airflow. Use for cooling computers, equipment, etc. Features two l-7/B"x3/4" blades. Connect through 10K resistor (supplied) to any source of 110V or 120VAC C Lino Con! to use with ibovc Farr G761 49$ «*eh. „ This tiny fan made by SHICOH lias no brushes to wear out. Features whisper quite smootfi running and only ISA current drain. This is absolutely the smallest 12VDC fan 1 we have seen - only 1-9/16' square x 15/16' thick. Use for cooling computers, equipment, etc. Will even work on a 9V transistor battery. Hurry, we bave only a limited supply of these beauties! $15.95 T2 103V MODEM Trie T21 03V contains a Bell System 103 modem that operates at 300 baud full duplex or 1200 baud half-duplex tt has error checking and is an intelligent modem, which conforms to EIA standards tor data communicalions and interlace signal characteristics. Has standard RS232C connector and modular phone jacks. These appear to be new and come with wait adapter and manual. Mfg. by TENERON.Usewilh almost any communications software program ELECTRONIC PROJECT KITS T4cW ; COMPUTER CONNECTOR/ ADAPTORS TYp6T _ h a 3 way adapter that has3DB25 female connectors connected G759 $1.98 t0 9 ether TYPE 2- is a male DB25 to 36 pin female Centronics, q 7 ^q $2.25 MINI GEIGER COUNTER KIT * Detects All Types of Radiation * Uses Sensitive Alpha Window Tube * Operates from 9V Battery (not incl.) * Comes w/PC Board, Parts, Tube, Instr. * Size of PC Board: 3""X1.9* C6430 $59.95 T5-tBl \ t C6356 $13.95 20W+20W STEREO AMP KIT La BWantat s* of our his contain Ml pjns, PC dojrrt and inflrucDOfls! T -^ o» ) BATTERY OPERATED BLACK LIGHT KIT * Operates from any 6V Battery Source (not incl.] * Detects invisible Fluorescent Inks, Minerals, etc. * Uses Large Unfiltered U Shaped Black Light Tube o o-: !■■■ o^ O C6442 $19.95 * Boost Car Stereos, Tape Players, Portable Radios, etc. * Features 2 Separate 20W RMS- Amps w/LeveJ Controls * Operates on Std. 12V Car Battery * Skill Level 2 ■T* 3y XENON WARNING FLASHER KIT • Bright white flashes of light • Requires only 2AA or C cells • Skill level 2 C3207 $10.00 HUMDINGER SONIC MOSQUITO REPELLER 4 Sale , These high output Ultrasonic Mosquito Repelleis have a 1-1/2" diameter ultrasonic speaker and a two I C circuit to produce a high intensity penetrating ultrasonic sound. We have not tried them , but at this price there is not much to lose! The on/off switch has a test position, which allows you to hear what the mosquitos hear (and it is obnoxious). The case is bright red with a key chain attached. Operates from 9V battery (not incl.). Size: 3-3/8' tall x 1-3/4' diameter. Retail Cardw/10 Humdingers $16.00 G763 $2.00 each CDS CELL A Great tor hundreds ol projects and experiments. These change their resistance with light S different types. G764 5/$2.00 1 4KV TRIGGER COIL j Use with any ^00T-t I strobe tube r ,- \7~ ! thatneedsa _• — i — - 4KV trigger. 3LeadN1700 "H^ 1.25 Each, 100 for $80 4 Lead N1701 1.45 Each, 100 for $80 isale OPTICS -^ i T [INVERTER 3 Ft Lo^ | TRANSFORMER [ Small 4 lead transformer for use Small diameter unjacketed fibei with 555 IC to convert 12VDC to optic Strand. Perfect for 1 COG'S [ 250V for strobe/fluorescent tubes of applications. Fun to use and| with schematic, experiment with. G755 N1703 $2.00 Each 5pcs for $ 1 .00 1 1 «000 for $1 ,500 FAST SERVICE FAIR PRICES! CIRCLE 265 ON FREE INFORMATION CARD RE-SHOPPER 33 Countersurveillance Never before has so much professional information on the art of detecting and eliminating electronic snooping devices — and how to defend against experienced information thieves — been placed in one VHS video. If you are a Fortune 500 CEO, an executive in any hi-tech industry, or a novice seeking entry into an honorable, rewarding field of work in countersurveillance, you must view this video presentation again and again. Wake up! You may be the victim of stolen words — precious ideas that would have made you very wealthy! Yes, profes- sionals, even tank amateurs, may be lis- tening to your most private con- versations. Wake up! If you are not the victim, then you are surrounded by countless vic- tims who need your help if you know how ro discover telephone taps, locate bugs, or "sweep" a room clean. There is a thriving professional service steeped in high-tech techniques that you Can become a parr of! But first, you musr know and understand Countersurveilance Technology. Your very first insight into this highly rewarding field is made possi- ble by a video VHS presentation that you cannot view on broadcast television, sat- ellite, or cable, ft presents an informative program prepared by professionals in the field who know their industry, its tech- niques, kinks and loopholes. Men who can tell you more in 45 minutes in a Straightforward, exclusive talk than was ever attempted before. Foiling Information Thieves Discover the targets professional snoopers seek out! The prey are stock brokers, arbitrage firms, manufacturers, high-tech companies, any competitive industry, or even small businnesses in the same community. The valuable informa- tion they filch may be marketing strat- egies, customer lists, product formulas, manufacturing techniques, even adver- tising plans. Information thieves eaves- drop on court decisions, bidding information, financial data. The list is unlimited in the mind of man — es- pecially if he is a rhief! You know that the Russians secretly installed countless microphones in the concrete work of the American Embassy building in Moscow. They converted 34 RE-SHOPPER ORDER TOLL FREE 1-800-522-6260 HAVE YOUR VISA or MC CARD AVAILABLE what was to be an embassy and private residence into the most sophisticated re- cording studio the world had ever known. The building had to be torn down in order to remove all the bugs. Stolen Information The open taps from where the informa- tion pours out may be from FAX's, com- puter communications, telephone calls, and everyday business meetings and lunchti me encounters. Businessmen need counselling on how to eliminate this in- formation drain. Basic telephone use cou- pled with the users understanding that someone may be listening or recording vital data and information greatly reduces the opportunity for others to purloin meaningful information. RADIO-ELECTRONICS VIDEO OFFER RES ■SOO-B Bi-Couniy Blvd. fcmningdalc. NY 1 17« Please rush my copy of the Countersurveillance Techniques Video VHS Cassette Tot j<19-9^ plus $<1 .00 for postage ami handling. No. of Cassettes ordered Amount of payment $ Bill my D VISA D MasterCard Catd No. Expire Date 1 Signature . Name Address City . State . . ZfP - All payments in U.S.A. funds. Canadians add $4.00 per VHS cassette. No foreign ordets. New York State residents add applicable sales tax. The professional discussions seen on the TV screen in your home reveals how to detect and disable wiretaps, midget radio-frequency transmitters, and other bugs, plus when to use disinformation to confuse the unwanted listener, and the technique of voice scrambling telephone communications. In fact, do you know how to look for a bug, where to look for a bug, and what to do when you find it? Bugs of a very small size are easy to build and they can be placed quickly in a matter of seconds, in any object or room. Today you may have used a telephone handset that was bugged. It probably contained three bugs. One was a phony bug to fool you into believing you found a bug and secured the telephone. The sec- ond bug placares rhe investigator when he finds the real thing! And the third bug is found only by the professional, who continued research just in case there were more bugs. The professional is not without his tools. Special equipment has been de- signed so that the professional can sweep a room so that he can detect voice-acti- vated (VOX) and remote -activated bugs. Some of this equipment can be operated by novices, others require a trained coun- tersurveillance professional. The professionals viewed on your Tele- vision screen reveal information on the latest technological advances like laser- beam snoopers rhat are installed hun- dreds of feet away from the room they snoop on. The professionals disclose that computers yield information too easily. This advertisement was not written by a countersurveillance professional, but by a beginner whose only experience came from viewing the video tape in the pri- vacy of his home. After you review the video carefully and understand its con- rents, you have taken the first important step in either acquiring professional help with your surveillance problems, or you may very well consider a career as a coun- tersurveillance professional. The Dollars You Save To obtain the information contained in the video VHS cassette, you would attend a professional seminar costing $350-750 and possibly pay hundreds of dollars more if you had to travel to a distant city to attend. Now, for only $49.95 (plus $4.00 P&H) you can view Countersur- veillance Techniques at home and take refresher views often. To obtain your copy, complete the coupon below or call toll free. THING So don't. For only $6 per hour, you can download to your hard disk from DELPHI'S library of over 10.000 programs. That's right, just $6 per hour including evening and weekend local phone number access at SIGH IIP WITH YOUR COMPUTER AND MODEM • Dial 1-800-365-4636 • At Username: type JOINDELPHI • At Password: type ELECTRONICS Of course, you may eventually fill up your hard disk. Then you can enjoy exploring DELPHI'S other services such as electronic mail, conference, multi-player games, news, encyclopedia, stock quotes, and travel. modem speeds up to 2400 bps. Join DELPHI now for $9.95 and your first hour is free. There's no risk — if you're not completely satisfied, we'll refund the $9,95. Save even more by choosing the 20/20 Advantage Plan. At 20 hours for $20, it's the best deal in downloading. DELPHI POPULATING HARD DRIVES SIHCE 1982 General Videotex Corporation • Three Blackstone Street • Cambridge MA 02 139 800-544-4005 • 617-491-3393 CIRCLE 294 ON FREE INFORMATION CARD RE-SHOPPER 3! COMBO PLUS by AST RESEARCH INC. $29.95 Memory Expansion & I/O Board for IBM PC, XT & Compatibles, real- time Clock-Calendar with battery backup, RS-232C Serial port, parallel printer port, SuperPak™, SuperSpool™, clock software, and the RAMCLEAR memory initialization utility program (available with 64, 128, 192, or 256 kilobytes of RAM memory $9.00 per 64K increments, SIX PACK PLUS $39.95 Same as Combo Plus but expands to 384 KB of memory SONY BATTERY PACK NP-11 $39.95 (9.6V.100OMA) for laptop computers and camcorders, nickel-cadmium battery ASYNC CLUSTER ADAPTER by AST RESEARCH INC. $199.00 Multichannel Board providing four individually addressable RS-232 Serial Ports on IBM PC/XT/AT and compatibles (uses AST- FourPort/XNTM Enhanced Xenix™ Communications Version #2.0) (ASYNC CLUSTER ADAPTER Cable additional $15.00). 1/4" STREAMING TAPE CONTROLLER by ADAPTEC, $33.95 SCSI to QlC-36, Model ACB-3530A (Manual $5.00) FLOPPY DISK CONTROLLER BOARD $19.95 Dual 360K or 720K switch selectable BEZEL $2.00 For full height hard drive, black with rectangular LED lower lefthand cor- ner, double-sided tape for mounting, 3-3/8"x5-7/8" LASER PLATFORM ARRAY $499.00 10 MW HeNe Laser, power supply, 2 beam splitters, 5 front surface mirrors, AO modulator, AO driver, polygon scanner, photo detectors, 3 special lenses, polarizer, over $5,000 worth of optical components plus documentation. Sold many of these to Fortune 500 companies, universities, and research labs. Applications include research, design and engineering. An experimenter's dream. NEW! NEC 10 Mil HeNe LASER Plus Power Supply $200.00 LASER POWER SUPPLY $39.95 Semi-kit. Units removed from laser video disk players, comprised of power cable, transformer and circuit board. Will power 1 to 10 MW HeNe laser. Excellent bargain. SHARP LASER DIODE $8.95 LT022MC, 5mW at 780nm, single transverse mode. MIRRORS, PRECISION FRONT SURFACE For use with lasers. 13-7/8 "xl-3/16" $7.00 19-1/2"x1-5/8" $10.00 GREEN FLUORESCENT TUBE for scanners $2.00 STAGE/STUDIO QUARTZUNE LAMP FEL(Q1000/4CL) 1O00W, 120V 3200" $9.95 INTEL 27128A-20 EPROM (New) $4.00 INTEL 2732 A-3 EPROM (New) $2.00 INTEL P-8031 $3.00 TRIAC: Hitachi FSM16F4 400 volts 16 amps $2.50 DIODES 6A 200V Motorola Part No. MR752 30 for $10.00 RF CONNECTOR APPLIED ENGINEERING PRODUCTS $2.50 Model 2005-1551-003 GOLD WIRE WRAP SOCKETS 14 pin-10 pcs/$5 16 pin-10 pcs/$6 SOLID STATE RELAY, CRYD0N D1240 $19.95 input 3-32 VOC, output 120 VAC 40A BIPOLAR LEDS 10 PCS/S6 MOTOR, A1RPAX $9.95 120VAC 60Hz 2-12:1 gear train, toothed pinion COMPUM0T0R:MOT0R- CRYSTAL DRIVE SYSTEMS OSCILLATORS $1.50 Model M57-83 $ 773 8 MHz. 13333 MHz, Model M57-102 $ 942 36037 MHz ^ 4a7664 MHz Model M106-178 $1695 50 MHz, 51.04 MHz, 756 MHz VGA RT. ANGLE PC BOARD MOUNT CONNECTOR Hi Density DB 15 10 pcs/$10.00 COMPUTER POWER CABLES BY BELDEN $2 10 AMR 18/3, 6" TOSHIBA T3100 EXPANSION INTERFACE PA7313E $99.00 EXPANSION BOX PA7310U $299.00 Interfaces Toshiba laptops to IBM BUS to use IBM add-on boards. LCD DISPLAY (MODEL LM585) BY HITACHI $199 640 x 200 Graphic and Alphanumeric LCD DISPLAY (MODEL EA-Y40025AT) BY EPSON $35 40 characters X 2 lines POWER SUPPLY 9.95 For computer related equipment, Input 120V AC, 60Hz. 30W; Output =5V DC, 100OMA, +/- 12V DC, 2O0MA CCD DOCUMENT SCANNER $39.95 Uses a 4096-element line imaging chip. Can use for robotics, astronomy, machine vision, high resolution slow scan TV, etc. Sup- plied with documentation, STEPPER MOTOR $29.95 By Oriental Motor, Model #PH566-A-Q5, high precision, 500 steps per revolution, 0.72° per step. HITACHI LCD DOT MATRIX LM215B $29.00 Graphic and Alphanumeric, 480 Dot(W) x 128 Dot(H) High quality device easily interfaced with microprocessor. Bit map graphics and text. Other ap- plications possible. Driving voltages available at microprocessor port, CMOS/TTL compatible signal level, built-in RAM for display data storage, built-in CMOS LCD driver and controller, supports full ASCII and extended character set, character size 5x7 or 7x9, dimensions 10.6" L x 4.3" W x 4/100" D HITACHI DIGITIZING TABLET HICOMSCAN HDG-111 input device through which graphic data is input to a computer. 11" x 10" Dimension $199.00 4-Button CURSOR for Digitizing Tablet $29.95 Manual $5.00 EDGE CARD CONNECTORS 22/44 Connector, .156 spacing 10pCS/$7.50 25/50 Connector, for Apple 10pcs/$10.00 COAX CONNECTOR Part sCP-Nt $1.50 MONITOR BOARD WITH POWER SUPPLY/HI VOLTAGE $7.95 Video, brightness, focus, vertical, and horizontal with flyback transformer and high voltage parts, Model 99-0493-001 rev D Replacement CABLES for IBM-like keyboards $2.99 APPLE MANUAL (LaserWriter and LaserWriter Plus) $5.00 WATERTIGHT ALARM BELL $19.95 By Henschel Corp., Type IC/BID3, size 3", 24V DC 5 LB. SOLDER $25.00 Wire, Rosin Core, Tin/Lead 60/40, Flux 2.2%, Dia. .036 (20Ga) HARD DRIVE CONTROLLERS: Western Digital ST-506 (10-200 Mb) XT-WD1002A-WX1 $29 AT-WD1003WAH $39 HP NUMERIC DISPLAY 5082-7300 $4.95 DATA LINK CONNECTOR $7.75 (AMP Part #501107-2) Fiber optic field mountable connector used with 125 NM fiber clad OD. This connector mates with AT&T 40 MB/s and 1 MB/s data link products. AT&T F. Eq. Ref. No. 1005B. AMP OPTIMATE FIBER OPTIC CABLE ASSEMBLY $49 with Biconic Connectors (AMP Part #501450-2) 5 meters long, SYMBOL LASERSCAN 2000 VISIBLE LASER DIODE SCANNER $899 Hand-held point-of-sale bar code scanner manufactured by Symbol Technologies, Inc. ORIGINAL IBM MODEL 1130700 COMPUTER PC POWER SUPPLY $19.95 63W 115VAC. ORIGINAL IBM MODEL 154001438 COMPUTER PC-XT POWER SUPPLY $29.95 1 30W 1 1 5VAC. 36 RE-SHOPPER GOTT ELECTRONICS a □ □ □ a LASERS Laser Platform Array Kit Price $499 Can be used for research, design, and engineering in the medical, industrial, and educational sectors. An experimenter's dream in the fields of holography, interferometry. graphic arts, light shows, and projection. The Laser Deck Consists of: □ AW milliwatt (maximum output) Helium-Neon laser tube (NEC Part #GLG 5261} which emits a red beam. The tube is haid seal and 15.5" long by 1.75" in diameter. It is mounted by two transverse mounting fixtures. The laser power supply (NEC Part 0GLS5281A) powers the laser tube and has an input voltage of 115 to 120 VAC. Output sustaining voltage is 2800 to 3300 VDC. This unit sits on an 18.5 lb precision cast aluminum plate. The acoustic-optic modulator (NEC Part #OD8813A) is a 140 Mhz broad band amplifier and will take TTL and video signals. The A-0 driver is on the deck also and requires 24 volts to operate. The polygon motor unit (Mfr: Japan Electronics) is a ten-sided first surface mirror mounted on an electric motor that spins at approx. 26,000 rpm. The driver for the polygon unit is on the deck and requires 24 volts to operate. In addition to the main items above, there are (5) special surface mirrors, (2) beam splitters and (3) special lenses all attached by optical mounts which guide the laser beam to various sensors and places to give the desired result, a reproduced copy of information. □ We have available an excellent 24 volt LAMBDA™ power supply at 49.95 that will power both the Acoustic-optic modulator and driver and polygon motor unit and driver. Laser Beam Modulator $398 MCI Ml 6 tube of 25 $5.00 (Acoustic-Optic Modulator and Driver} Tri-state switch, CMOS COMPUTER POWER SUPPLY 130W115VAC IBM-XT Model 1501438 (+5V.+12V, -5V, 12V) These are brand new supplies. They make an excellent workbench power supply for experi- menting. They can also be used in XT comput- ers and other electronic equipment. Priced to move Argon-Ion Laser (Air Cooled) $2995 These lasers emit visible blue and green lines. Power output is 110mW. They are re-buirt with brand new tubes and power supplies. Manufactured by a major laser company, they are excellent for laser shows and holography. These lasers are guaranteed for one year. NINTENDO GAME CONNECTOR $9.95 The black connector inside game unit that game cartridge fits into. Often needs replacing when cartridge makes intermittent contact. Almost impossible to get. POWER SUPPLY $9.95 Bikor Corp. LBA 5-6, Input 115/230VAC, 47-440Hz, Output 5V DC at 6.0 AMPS. HALOGEN LAMP S2.8S Toshiba JH115V930WK1 A. 17" long, 120V. HP 10-ELEMENT BAfl GRAPH ARRAY J2.00 H DSP -4820 (red) HITACHI DIGITIZER $99.00 Comscan HDG-11 1 , grid board/mother board, no plastic case, you build the case. Standard serial interface (1 5" X 1 5-1/2"), works on a PC. IC SOCKETS $1.00 40 pin, Robinson-Nugent, tube of 10 MICRO-CONTROLLER- grj48 $ 150 ROM is already programmed-you find a use, we've got 40K of these! HITACHI DIGITIZER $199.00 HDG-1515BN-C, grid board/mother board, no plastic case, you build the case. Standard serial interface. Runs ail versions of autocad. Cannot be used with mouse emulation. Gott Electronics carries thousands of parts, i.e., lasers, optics, electro- mechanical, stectro-optic, power supplies, computer related materials and general electronic supplies far too numerous to list. In order to better serve you. watch for our highly innovative bulletin board catalog ordering system. Coming soon. . .contests with prizes and giveaways. Have excess inventories to sell? Call us or FAX us your lists. Need special pare? Let us know. 1. 2-9 .... 10-25 .$29.95 $25.00 $20.00 CABLE NAILS by the box WOWl Black or White Each box, 100 nails. #814W-A813mmfordual RG-59 cable. Manufactured by ABERDEEN. Used to tack when running cable. They have a hardened nail and tough plasticconstruction. 1 2-9 .... 10-25 $2.00 $1.50 .$1.25 The REAL THING HARD TO FIND The complete IBM DOS 3.3 manual in Spanish. Excellent for the bilin- gual schools and trade schools. We had a hard time finding these, so let's just blow then out to you. 1-9 10-49... 50-99... 100-up, $17.95 .$15.00 $12.95 .$11.95 COMPUTER SWITCHING POWER SUPPLY 63W 115VAC IBM-PC Model 1130700 (+5V T +12V, -5V, 12V) Brand Mew Supplies. Goad for the workbench. Can be used for external drive. Full of good parts, 12VDC fan, caps, tran- sistors, etc. We have over 1 ,000 of these units. Priced to move. 1 $19.95 2-9 $16.95 10-25 $14.95 EL DOS de IBM es la base para miles de prcgrarnas de aplicacion. Muchas facilidades en el manejo de datos estan a su disposicion. Y usted puede desarrollar nuevas apllcaciones en una amplia gama de lenguajes de programed on so- portados. POWER CABLE 157" Long, 115V 20A 14/3 grounded 3-wtre. Male plug one end, other end 3 wires. Black. Can be used on power tools, air conditioning, electrical appliances, and wherever.These are real beau- ties, difficult to find. We have over 4,000 1-9 10-49 .-. 50-99 .. 1K .$5.00 .$4.50 .$4.00 .$3.00 ORDERS COD, Cashier's Check or Money Order Technical Support (213) 316-0916 FAX: (213)316-9139 [ 24-HOUR PROS LWE: 800-544-^44 Si 5.00 minimum oraer. CA residents ma 6.75% GOTT ELECTRONICS 2227 DuFour Avenue, Redondo Beach, CA 90Z78 CIRCLE 250 ON FREE INFORMATION CARD RE-SHOPPER 37 GET THE LATEST ADVANCES IN ELECTRONICS WITH A SUBSCRIPTION TO RatiUiD HadiB BUILD A SOLID-STATE LASER! Our handheld laser runs on batteries! WHAT'S THE FUTURE OF SATELLITE TV? A loot at how che latest direct-broadcast proposals are aimed at cable TV SCREEN VOUR TELEPHONE CALLS ELECTRONICALLY! By building our call scr eener BUILD A PORTABLE OUAD ANTENNA A h.gh -performance antenna for the 2-meter band ENJOY THE WORLD OF ELECTRONICS EACH MONTH! Now you can subscribe to the best elec- tronics magazine. The only one that brings you articles on— electronics projects, tech- nology, circuit design, communications, new products and much more. Radio-Electronics looks to the future ana shows you what new video, audio and com- puter products are on the horizon. What's more you'll find helpful, monthly deport- ments such as Video News, Equipment Reports, Hardware Hacker, Audio Update, Drawing Board, Communications Corner. All designed to give you instruction, tips, and fun. Radio-Electronics gives you exciting articles like: J ISDN: The Telephone Network of Tomorrow □ The Facts on FAX □ A Digital Phone Lock J How To Design Switching Circuits D EIA-232 A real standard for serial interfacing? I_j Build a synergy card for your PC □ '386 Power at a '286 price Zl Build a biofeedback monitor Z} More on Multiplexing FOR FASTER SERVICE CALL TODAY 1-800-999-7139 DON'T DELAY SUBSCRIBE TODAY! Just fill out the order card in this magazine and mail it in today. 38 RE-SHOPPER C0*L i^ •P" PRELCO ^ W 605 Chestnut St • Union, N.J. 07083 1 ' TEL: 201-851-8600 FAX: 201-686-4656 W G 3 fiiaartfetfCofaj JAPANESE IC'S BA3406L 1.75 KIA7217P 1.50 M5278LS6 ,60 STK5372 5.35 TCP4621 2.75 UPC1182H ,95 NAP SEMI'S AN214 2.50 BA3416BL 1.75 KIA7222 1.75 M51102L 250 STK5471 5.10 TD6710AN 3.20 UPC11B6H 1.45 15-35059 1.25 AN217 1.B0 BA3708F 1,40 L5630 1.55 M51172P 1.50 STK5476 5.10 TD62105P 1.80 UPC11B7V 1.85 15-37701 2.95 AN236 2.65 BA3812L 1.25 LA.1111 1.25 M51307BSP 8.25 STR380 4.75 TD62504P 2.85 UPC1188H 1.45 15-37702 1.85 AN239 6.50 BA3828F 2.45 LA1140 1.50 M51512L 1.50 STR381A 4.75 TD62506P 2.55 UPC1191V .95 15-37704 1.75 AN240P 1.40 BA4210 1.75 LA11&0 1.65 M51533L 1.50 STR451 6.25 TD62553S 2.85 UPC1197C 2.45 15-39207 4.95 AN245 4.25 BA4232AL 1.95 LA1185 1.50 M51544AL 2.75 SIR 2013 3.50 TD62555S 2.20 UPC1228H 1.10 15-39208 2.25 AN262 1.75 BA4234L 1.95 LA1201 .95 M51903L 1.80 STH3115 4.75 TDA1057 1.55 UPC1252H 1.95 15-39209 2.50 AN277 2.45 8A4402 1.00 LA1210 1.65 M54514AP 1.90 STR3125 4.75 TDA1 1 70 2.40 UPC1253H 1.95 15-41627 2.20 AN302 3.50 8A4403 1.25 LA1222 1.65 M54516P 1.80 STR3135 4.75 TDA1190Z 2.10 UPC1263C 1.25 15-41764 4.10 AN305 3.50 BA4558 .90 LA1231 1.55 M58473P 1.50 STR30123 4.75 TDA1220A 2.45 UPC1350C 1.35 15-43098 4.40 AN31B 3.75 BA5101 1.85 LA1245 1.75 M58626P 2.65 STH3O130 4.75 TDA1220B 2.45 UPC1352C 2.40 15-43703 1.35 AN335F 1.85 BA5102 1.85 LA1260 1.60 M58846 2.35 T74LS164 1.25 TDA1578A .95 UPC1363C 2.65 15-45300 1.30 AN360 1.00 BA5115 2.75 LA1265 1,95 MAB8461P 4.10 TA2003 1.25 TDA2002V .65 UPC1371G 2.90 610471-1 .55 AN362 1.85 BA6104 2.95 LA1365 .65 MB3702 1.65 TA7054P .65 TDA2003V 1.25 UPC1373H 2.00 610551-1 .95 AN366 2.00 BA6144 1.75 LA3115 1,35 MB3712 1.40 TA7060P 1.60 TDA2030H 1.55 UPC1378H 1.40 612042-2 2.75 AN608P 1.65 BA6146 1.70 LA3155 1,25 MB3713 1,75 TA7061AP 1.10 TDA2540 1.80 UPC1379C 1.60 612044-1 1.50 AN3313 3.50 BA6209 1.50 LA3160 ,80 MB8726 2.45 TA7092P 2.40 TDA2577A 2.65 UPC 1470 1.10 612069-1 2.35 AN3821K 6.25 BA6238A 2.50 LA3161 ,85 MB88303 7.75 TA7115P 1.50 TDA2820M 1.50 UPC1474H 4.50 612070-1 1.80 AN5015K 1.50 BA6993 1.60 LA3220 .90 MC78HC04 .35 TA7117P 2.70 TDA2822M 1.55 UPC1513 1.35 612072-1 1.75 AN5O20 1.75 CA1391E 1.45 LA33Q1 1.45 MC78M05CT .20 TA7142P 2.45 TDA3190 2.00 UPC1514 1.60 612076-4 2.85 AN5111 3.75 CA1394E 1.45 LA3310 .85 MC78M06CT .20 TA7154P .95 TDA3564N 6.10 UPD261 2.95 612076-7 2.85 AN5151 3.75 CA3070E 1.75 LA3350 1.75 MC78M12CT .20 TA7157P 1.80 TDA3570 4.20 UPD262 2.95 612094 2.15 AN5265 3.50 CA3072E 1.75 LA3360 1.75 MC78M18CT .20 TA7204P 2.25 TDA3653 3.85 UPD547LC 1.50 612120-1 3.80 AN5310 4.75 CA3088E 1.50 LA4031 2.50 MC1309P 1.25 TA7205AP 1.65 TDA3654 2.65 UPD865C 1.75 612298-1 3.90 AN5312 2.75 CA3126E 1.70 LA4182 2,75 MC1310P 1.25 TA7217P 1.50 TDA4433 3.75 UPD946 5.50 612305-1 1.30 ANS512 1,50 CA3126Q 1.60 LA4261 1,90 MC1351P 2.95 TA7226P 2.10 TDA4505A 8.75 UPD1200 6.95 612331-2 5.50 AN5515 1.65 CA3151E 3.10 LA4420 1.65 MC1357P 1.45 TA7230P 1.75 TDA7211 2.50 UPD1203C 2.00 612337-3 4.70 AN5700 1.75 CA3166E 4,50 LA4422 1.65 MC1394P 1.40 TA7267P 2.25 TDB2033 1.50 UPD1709 5.50 612338-3 5.10 AN5720 1.50 CA3177E 1.95 LA4430 1.65 MC3001 1.10 TA7310P 1.10 TL081CB 1.50 UPD1913 2.75 612347-2 1.95 AN5730 1.90 CA3195E 1.95 LA4440 1.95 MC3357P 1.75 TA7312P 1.95 TL431CP .95 UPD1837C 2.10 612405-1 2.25 AN5750 1.50 CA3202E 2.30 LA4500 2.95 MC7809CT .50 TA7313AP 2.05 TL783C 1.35 UPD1986C 1.65 ZENITH IC'S ANS760 1.60 CA3217E 3.45 LA5512 1.25 MC7813CT .30 TA7317P 1.50 TMC1073 3.40 UPD1987C 1.65 221-43 2.35 AN6291 3.50 CA3218E 1,75 LA5521D 1.25 MC7902CT .30 TA7325P 1.50 TMS1071 4,40 UPD6104C 2.10 221-45-01 2.60 AN6306 3.95 CA3224E 2.45 LA6356 1.10 MC7905CT .30 TA7330P 2.55 TMS1751 2,45 UPD6111 6.45 221-46 1.75 AN6307 3.95 CA3234E 5.95 LA6358S 1.10 MC7905.2CT ,30 TA7331P 1.60 TMS1944N 2.90 UPD7538C 4.95 221-69 1.95 AN6326 295 CA3236E 5.95 LA7032 5.20 MC7908CT .30 TA7335P .90 TMS3450 2.90 UPD8039H 2.85 221-77 3.20 AN6327 2.10 CA3237E 1.75 LA7507 1.50 MC7912CT .30 TA7341P 1.85 TMS3451 2.45 UPD75106 5,45 221-78 2.85 AN6326 3.25 CA3238E 1.75 LA7520 2.75 MC14011B ,15 TA7342F 1.25 TMS3452 2.45 X0137CEZZ 3.95 221-79-01 1.75 AN6337 2.85 CA7607E 1.65 LA7530 2.75 MC14023B .45 TA7342P 1.25 TMS3459 2.45 TRANSISTORS 221-87-01 2.15 AN6341 2.95 CA761 1 E 1.65 LA7655 5.25 MC14024B .40 TA7343P 1.85 TRC2073D 1.50 2SA564 ,25 221-92 .95 AN6342 2.10 CD4013B .15 LA7800 2.25 MC14025B .40 TA7353P 1.40 TX7809CT .25 2SA1015 .25 221-97 1.75 AN6343 2.90 CD40698 .15 LA7830 2.05 MC14049B .15 TA7358P 1.25 U416B 3.10 2SC454 .20 221-97-01 1.75 AN6346 3.85 CD22402E 8.95 LA7910 1.10 MC14069B .15 TA7373F 1.55 U417B 2.30 2SC708 .85 221-97-02 1.75 AN63S0 625 CX770 3.75 LB1252 2.40 MC14073B .65 TA7378P 1.50 U420B 2.75 2SC710 .20 221-102-01 2.65 ANS359 3.90 CXA1019 4.90 LB1403 1.10 MCM21 14 1.50 TA7504S 1.15 ULN2110 1.45 2SC71 1 .20 221-103 1.95 AN6360 3.95 CXD1135 3.85 LB 1405 1.35 MM5368 3.00 TA761 1 P 1.65 ULN2212 2.45 2SC828 .20 221-104 1.95 AN6361 3,95 CXK5816M 4.90 LB1409 2.10 MM5387AA 2.00 TA7613P 2.30 ULN2228 1,50 2SC829 .20 221-105 2.10 AN6362 4.50 HA1137W 1.50 LB1416 1.75 MM5456N 1.60 TA7614P 2.55 ULN2229 1 85 2SC945 .15 221-106 2,20 AN6366NK 5.25 HA1156 1.40 LB1450 .90 MM7317BN 1.50 TA7628P 1.75 ULN2261 2.10 2SC1055 1.65 221-111-01 .75 AN6387 5.10 HA1197 1.80 LC7131 1.25 MN1280R 2.45 TA7630P 1.75 ULN2269 1.90 2SC1306 1.55 221-140 3.75 AN6650 3.10 HA1199 2.95 LC7267 2.95 MN4052B .20 TA7640P 1.50 ULN2280 1.50 2SC1387 1.40 221-157-02 1.65 AN7025 1.60 HA1203 1.65 LF347N 1.55 MN4081B .20 TA7644P 5.75 ULN3810A 1.65 2SC1816 1.60 221-158-03 1.65 AN7110 1.50 HA1306W 2.65 U2O06 1.50 MN6163 3.95 TA7658P 1.75 ULN3859 1.45 2SC1829 1.45 221-16001 2.15 AN71 1 1 1.50 HA1338 5.90 LM317T .75 MN6168 3.75 TA7668P 1.50 UPA53C 1.80 2SC1940 .50 221-164 2.75 AN7115 1.50 HA1406 1.75 LW337MT .60 MN 15823 3.75 TA7670P 5.75 UPA80C 1.50 2SC1941 .65 221-171 .75 AN7142 1.75 HA11211 2.75 LM34QT-5 .30 MP47C425 2.65 TA7678P 4.10 UPB553AC 1.45 2SC1964 1.75 221-175 5.95 AN7143 2.75 HA112E6 3.50 LM340T-6 .30 MP1908 3.40 TA7680P 4.75 UPC16C 1,50 2SC1973 1.50 221-178 1.60 AN7205 1.50 HA11227 1.85 LM340T-8 .30 MPC574J 1.55 TA7687P 2.60 UPC27C 2.25 2SC1975 1.95 221-179 5.95 AN7213 .85 HA11423 2.25 LM340T-12 .30 MSL2906 1.60 TA7705F 1.60 UPC358C 1.25 2SC21 66 1.75 221-190 5.95 AN7222 1.50 HA11747 7.50 LM340T-18 .30 MSL9372 3.75 TA7709F 1.50 UPC393C 1.60 2SC2230 .50 221-192 1.25 AN7224 1.75 HA12003 1.25 LM350T 1.75 NIS7264B 3.95 TA7719P 1.50 UPC554C 1.90 2SC2271 .50 221-193 2.10 AN7310 1.10 HA12413 2.25 LM379S 3.95 NJKA2063A 1.50 TA7757F 95 UPC555H 1.50 2SC3038 1.25 221-213 .90 AN7320 1.25 HCF4011B .15 LM380N 1.25 NJM2068S 1,50 TA7766AF 2.40 UPC556H 1.50 2SC3298A 1.10 221-250 1.75 AN7410 1.50 IR2E01 1.50 LM384N 1.55 NJM4558S ,75 TA7777N 8.75 UPC571H 1,50 2SD77 .75 221-261 4.25 AN7420 1.30 IR2E02 1.50 LM1011N 1.75 NJM78L08 .25 TA7784P 1.25 UPC574 .65 2SD91 2.05 221-267 9.95 AY-385-00 2.45 IR2E05 1.50 LM1818N 2.50 OEC0001B 5.80 TA7792F 1.85 UPC575C 1.75 2SD200 1.60 221-285-02 5.50 AY-385-01 2.45 IR2E19 1.50 LM1822N 5.95 OEC1002 5.80 TA8102P 1.75 UPC577H 1.60 2SD870 1,65 221-285-03 5.50 BA235 1.60 IR2403 1.80 LM1823N 5.95 OEC2003 5.80 TA8105N 1.75 UPC585 4.45 2SD951 1.65 221-303 3.30 BA301 1.50 IR2406G 1.80 LM1868N 2.40 OEC3006 6.10 TA81 10P 1.75 UPC587C 1.40 2SD1159 .75 221-304 1.90 BA328 1.00 IR2410 1.50 LM1877N-9 2.65 OEC5003 5.50 TA8115F 1.45 UPC592H 5.10 2SD1 1 75 1.85 221-347 2.80 BA521 1.25 KA2101 .55 LM1BS0J 2.95 SAA1124 1.90 TBA820M .95 UPC1018C 2.75 2SD1227 1.10 221-418 8.95 BA526 1.50 KA2102A 1.90 LM1B95N 2.75 SAB3036 3.75 TC4052BP .25 UPC1026C 1.25 2SD1 265 .85 221-419 1.80 BA532 1.25 KA2130A 1.45 LM2877P 1.80 SAB3037 2.95 TC4053BP .25 UPC1154H 2.40 2SD1266 .90 221-493 4.75 BA612 .90 KA2206 1.75 LM2901N 1.75 SAF1039P 1.90 TC5O80P 1,90 UPC1158H 1.45 2SD1397 1.65 221-516 6.75 BA618 1.75 KA2261 1.45 LM8361 3.10 SC84480P 4.50 TC5081P 1.50 UPC1171C 2.40 2SD1398 1.75 22 1 -523 2.60 BA718 .65 KA2263 1.85 LM6560 3.10 SG3524N 1.75 TC5082P 1.50 UPC1181H 2.30 2SD1428 1.50 221-545 2.75 BA728 BA1 102F BA1320 1.25 245 1.45 KA2281 KA2912 KB4409 1.20 2.50 1.50 LU11627B M5152L M5218U 3.00 1.35 1.25 SN29764 SN76115N SN76600P .75 1.10 1.10 TC9145P 2 20 TC9176P TCA830 275 1,50 Our Policy: • Minimum Order 125.00 • All Parti Factory Pima • Wo Accapl MOVna • Al Oman ShippiJ Via UPS Qjound BA3306 1.50 KB6404A 1.60 M5223L .75 STK011 4,45 TCA830SM 1.50 - Plaaaa Add (3.00 Shipping On All Ordan • NJ. RnkJanlt Plaaia Add 7% Salaa Tax • No C.O.D. ■ • Pricm Snown Suo»rc«d All Prmioui Prioai BA3308 1.25 KIA7137 1.10 M5238L 1,65 STK460 7.90 TCA45O0 1.75 RE-SHOPPER 39 SCIENCE PROBE! — the only magazine devoted entirely to Amateur Scientists! If you are fascinated by sci- ence in all its many forms ... if you can't stay away from a microscope, telescope, calipers, or test tube — we invite you to share the wonders in every issue of SCIENCE PROBE! You will join a community of Amateur and Stu- dent Scientists who enthusiastically seek scientific knowledge or follow sci- entific pursuits for their own sakes and not merely as a profession. Obtain your personal premier edition of SCIENCE PROBE! by visiting a quality Newsstand, Convenience Store, or Su- permarket this Fall or by reserving your personal copy through the mail by completing the coupon below. From the very first issue of SCIENCE PROBE! you will be involved in a world of scientific facts, experiments, and studies pursued by amateur scientists who are university students, inventors, academicians, engineers, or office workers, salesmen, farmers — whose quest is to probe into the mysteries of science and reveal them to all. Plan to become a SCIENCE PROBE! reader! Welcome to. . • SCIENCE The Amateur Scientist's Journal Embark on an irresistible new journey into the realm of mystery, challenge, and exploration! The perfect magazine for the budding scientist, the serious amateur, the professional who would like to relax, and those who simply want to gaze at the stars. Articles to appear in early issues of SCIENCE PROBE! are: LIGHTNING— CAPTURE IT ON FILM MONITORING ULTRAVIOLET FROM THE SUN MOBILE-MOUNT EXPERIMENTAL WIND TUNNEL CHECKING OUT ACID RAIN AERIAL PHOTOGRAPHY FROM KITES AND BALLOONS MINIATURE TRACKING TRANSMITTER KILLER BEE IDENTIFICATION HOW TO OBTAIN ANIMAL EYESHINE PHOTOGRAPHS If you're fascinated by science in all its many forms, if you are compelled to experiment and explore, then SCIENCE PROBE! is your kind of magazine! SCIENCE PROBE! RES J 5Q0-B Bi-County Boulevard I Farmingdale, NY 11735 I Please forward my Premier Edition of SCIENCE PROBE! as soon as it comes | off the press. I am enclosing $3.50-U.S.A. ($3.95-Canada) plus $1.00 for ■ shipping and handling. Better still, please enroll me as a charter-memher - subscriber and send the next four (4) quarterly issues of Science Probe. I am ' enclosing $9.95-U.S.A (Canada: $14.95 U.S.A. Funds) □ Premier Edition only □ First Four Issues (1 Year) I Offers valid in the U.S.A. and Canada only. No foreign orders. | Name | Address I City State ZIP I All Orders payable in U.S .A. Funds only. ON SALE AT QUALITY NEWSSTANDS, CONVENIENCE STORES AND SUPERMARKETS STARTING SEPTEMBER 13, 1990 — $3.50-U.S.A. — $3.95-Canada TOLL FREE ORDER HOT LINE 1-800-423-0070 KIT CORNER PC BOARD HACKERS CORNER WIRELESS FM STEREO BROADCASTER KIT CAT. NO. SFM-II $19,95 DCS all new FM Stereo Transmitter Kit Is based upon the unique BA1 404 h^v* Stereo Broadcaster Integrated Circuit that Includes all the complex circuitry to generate the stereo slgnai.ThekH includes the new special IC, a 38 KHz crystal, circuit board, and all the small ;omponents , This faclnallng project will provide many hours sf enjoyment as you re-broadcast your CD/VCR/Cassette or stereo broadcasts from your satellite system thru your high- quality FM home or auto stereo system. MAKE CIRCUIT BOARDS THE NEW, EASY WAY WITH TEC-200 FILM JUST 3 EASY STEPS 1 . Copy circuit pattern on TEC-200 film using any plain paper copier. 2. Iron film onto copper clad board. 3. Peel off film and etch. ORDER TEC-200- 1 FOR TEN FUNCTION GENERATOR KIT ORDE R FG2 KIT $19.95 lA great project to enhance your bench. This handy little func- tion generator has a built-in buffer amplifier, a 3-decade range ■selector switch that covers 15 hZ to 25 khZ, output level con- Itrol and function switch to select sine, square, or triangle. PC BOARD SUPPLIES Copper clad boards for use with TEC-200 22-250 3X6 $1.62 P1-36 3X6 2.03 22-260 4X6 2.27 22-261 6X6 2.88 22-263 6X9 4.08 POSITIVE PRESEN- SITIZED PC BOARDS 22-330 2X4 $3.83 22-332 3X4 4.40 22-334 4X6 5.78 22-336 6X6 7.60 22-338 6X9 9.63 DCS PARTS WAREHOUSE UNIVERSAL DECODER (RE MAY 1 990) ICs CD22402E 7.95 CA3126E 1.95 NE564 2.29 LM733 .99 74C0ON .29 CD4053 .50 LM7805 .50 LM7812 .50 LM7905 .50 18 Uh CHOKE .39 3.58 MHz 1.00 ORDER ABOVE ITEMS DIRECT FROM THIS PAGE ICL7106EV KIT LCD DIGITAL PANEL METER NOW $24.95 The ICL7106 EV Kit Is based upon a 3-1/2 digit A/D converter that Includes all the circuitry to build a digital panel meter. Operates from a 9-v battery. Includes LCD, 71 06 IC, circuit board and small parts. Builder must add resistors to expand to multi-meter POWER SUPPLY KIT PS-1 $16.99 Output or this power supply is con- liniously adjustable from 1.2 to 25V DC . The LM317T voltage regulator provides excellent regulation and ripple rejection. Includes a I A transformer, PC board, LM317T, 2 binding posts, and all small parts. MORE KITS 3 DIGIT LED DVM ONLY 3" X 3" READS TO 1 00 V DC ORDER DVM3 $1 9.95 FM WIRELESS BROADCASTER FMI $ 9.95 8038 FUNCTION GEN. KIT FGI $9.50 SEQUENCER PROJECT SEQKIT $9.50 CHRISTMAS TREE PROJECT Build this unique seasonal project and have an unusual conversion piece. Powered by two D cells, 1 7 LEDs flash In a seemingly ran- dom fashon. Kit includes everything except batteries. ORDER XMASKIT $16.95 70-WATT STEREO POWER AMP 35 WATTS PER CHANNEL Now you can boos ylour low power car stereo with the new PM-35 module kit. Each module can provide up to 35 watts per chan- nel whll operating from the vehicle's battery into a 4 ohm speaker system. New hi-tech power op-amps are used In a unique circuit to Increase voltage swings, thus more power.Addrtional modules can be used to in- crease power to 100 or 200 watts/channel. ORDER PM-35 KIT SI 9.95 UNIQUE ICs NE602 $2.00 UGN3013 .98 ULN2429 1.75 ZN414 2.00 XR2206CP 4.75 XR2212CP 4.75 MAX232 5.40 ULN3330 1.50 ICL8038 3.85 ICM7226BIPL 23.50 DC ELECTRONICS TO ORDER FROM THIS PAGE CALL: 1-800-423-0070 SEND MAIL ORDERS TO: PO BOX 3203 SCOTTSDALE, AZ 85271 CIRCLE 255 ON FREE INFORMATION CARD RE-SHOPPER Electronics Paperback Books GREAT PAPERBACKS AT SPECIAL PRICES D BP24B— TEST EQUIPMENT CON STRUCTION .... $5.95. Details con stmctEon erf simple, in expensive, but ex Ifernely useful has equipment. AF Gen Test Bench Ampl, Au dio Millivollmeter. Tran- sistor Tester and six mofe. ' 3P253-A CON- CISE INTRO TO dBASE $6,95, The dBASE series of pro- grams are probably the best known database programs for micro- cc-mputers. This book is designed to help you get started working with them. Q BP267— HOW TO USE OSCILLO- SCOPES AND OTHER TEST EQUIP- MENT $6.95. Mas- tering- Ihe oscilloscope is not realty too difficult. This book explains -all Ihe standard controls and functions. Other equipment is also o)e- scric-ed H BP265— MORE ADVANCED USES OF THE MULTI- METER $5.95. Use these techniques lo test and analyze the performance of a vari- ety of components. Also see how to build ad-ons to extend multi- meter capabilities. ******* b*w n BP256— INTRO TO LOUDSPEAKERS AND ENCLOSURE DESIGN $5.95. Wo explore the variety of enclosure and speaker designs in use today so Ihe reader can under- stand the principles in- votved. D BP260— CONCISE INTRO TO OS/2 $5,95 . If you are a mul- titasking PC user and want to get the most out of your computer, then you must learn its OS/2 operating sys- tem. This book shows you just how to do that, quickly and easily. □ BP249— MORE ADVANCED TEST EQUIPMENT CON- STRUCTION $6.95, Eleven more test equipment con- struction projects. They include a digital voltmeter, capacitance meter, current tracer and more. DhMAudh □ BP245—DIGITAL AUDIO PROJECTS ..... $5,95, Practical cir- cuits to build and ex- periment with, tn- cludes A. converter, input amplifier, digital delay line, compander, echo effect and -mora- n BP24T— MORE ADVANCED MIDI PROJECTS $5.95. Circuits included are a MIDI indicator, THRU box, merge unit, code generator, pedal, pro- grammer, channelizer. and anatyzer. n BP257— INTRO TO AMATEUR RADIO $6 + 95 + Amateur is a unique and fascinating hobby. This book gives the newcomer a com- prehensive and easy to understand guide to the subject. DIGITAL LOGIC GATES AND FLIP-FLOPS ■fcJT [ PCP1 07— DIGITAL LOGIC GATES AND FLIP FLOPS $10.00, Thorough treatment of gates and flip-flops for enthusi- asts, student and tech- nicians. Only a basic knowledge of elec- tronics is needed I I BP251— COMPUT- ER HOBBYISTS HANDBOOK $8.95, A wrap-up of ev- erything the computer hobbyist needs to know in one easy to use volume. Provides a range of useful refer- ence material in a sin- gle source. □ PC PI 02— INTRO- DUCING DIGITAL AU- DIO $9.95. Covers all kinds of digital re- cording methods — CD. OAT and Sam- pling. Bridges (he gap between the technician and the enthusiast. Principles and meth- ods are explained. n PCP106— COM- PUTERS AND MUSIC $9.95, Explains the basics of computers and music with no pre- vious knowledge of computers needed. Covers types of music software and explains how lo set up your own computer music stu- dio. D BP195— INTRODUCTtON TO SATELLITE TV..,.. $9.95, A definitive introduction to the subject written for the professional engineer, electronics enthusiast, or others who want to know more before they buy 8 M0 in. □ BP190— ADVANCED ELECTRONIC SECURITY PROJECTS $5.95. Includes a passive infra-red detector, a fiber-optic loop alarm, computer-based alarms and an unusual form of ultrasonic Intruder detector. G BP235— POWER SELECTOR GUIDE StO.OQ, Complete guide to semiconduc- tor power devices. More Irian 1000 power handting devices aie included. They are tabulated in alpha-numeric sequency, by technical specs. Includes power diodes. Thyristors, Triacs, Power Transistors and FETs. D BP234— TRANSISTOR SELECTOR GUIDE $10.00. Companion volume to 5P235. Book covers more than 1400 JE DEC. JIS, and brand-specific devices. Also contains listing by case type, and electronic parameters. Includes Darlington transistors, high- voltage devices, high-currem devices, high power devices. D BP9-9— MINI- MAT RiX BOARD PROJECTS $5.50. Here are 20 useful circuits that can be built on a mini-matrix board fhal is jusi 24 holes by ten copper-loll strips. D BPB2— ELECTRONIC PROJECTS USING SOLAR CELLS,. ...$5, 50. Circuits with applications around the home that are powered by the energy ot the su n . Everything from radio receivers, to a bicycle speedometer, to timers, audio projects and more P BP117— PRACTICAL ELECTRONIC BUILDING BLOCKS— Book 1 $5,75. Oscillators, Timers. Noise Generators. Rectifiers, Comparators. Triggers and more. □ QP1S4— 4NTRO TO &W00 ASSEMBLY LANGUAGE $6.95. The 68000 is a great new breed ot microprocessor. Programming in assembly language increases the running speed of your programs. Here's what you need to know. I ; BP179-ELECTRONIC CIRCUITS FOR THE COMPUTER CONTROL OF ROBOTS ..... ST. 50. Data and Circuits for interfacing Ihe computer to the robot's motors and sensors. □ BP239— GETTING THE MOST FROM YOUR MULTIMETER $5.95. Covers basics of analog and digital meters. Methods of component testing -includes transistors, thyristors, fesistofS, capacitors and other active and passive devices. □ BP97— iC PROJECTS FOR BEGINNERS.. .„$5.50. Power supplies, radio and audio circuits, oscillators, timers, switches, and more. If you can use a soldering iron you can build these devices. D BP37—50 PROJECTS USING RELAYS, SCR S & TRIACS $5.50. BuHd pri- ority indicators, light modulators, warning devices, light dimmers and more. D RADIO— 100 RADIO HOOKUPS $3,00. Reprint of 1924 booklet ptesents radio circuits ot ihe era including regenerative, neutrodyne r reflex & more. O BP42— SIMPLE LED CIRCUITS $5.50. A large selection of Simple applications for this simple electronic component. D BP127— HOW TO DESIGN ELECTRONIC PROJECTS $5.75. Helps the reader to put projects together from standard circuit blocks with a minimum of tnal and error. D BP122— AUOK) AMPLIFIER CONSTRUCTION $5,75. Construction details tor preamps and power amplifiers up through a 100-watt DC-coupled FED amptifter. . $550, Everything you need to know CHECK OFF THE BOOKS YOU WANT n BPM— CRYSTAL SET CONSTRUCTION., about building cryslal radio receivers. n BP45— PROJECTS IN OPTOELECTflOHlCS S5.50. Include* infra-red detec- tors, transmitters, modulated light transmission and photographic applications. n BP1S5— ELECTRONIC SYN- THESIZER CONSTRUCTION S5.95. Use this book lo learn how to build a reasonably low cost, ye I worthwhile monophonic syntnesizer and learn a tot about electronic music synthesis in the process. ELECTRONIC TECHNOLOGY TODAY INC. RO. Box 240, Massapequa Park. NY 11762-0240 Name SHIPPING CHARGES IN USA AND CANADA Address . City. .State . _Zip. RES Sa.DltdS5.DXl .. £5.01 id 10.00 .. $10.01 td S20.00 $20.01 to 530,00 S30.01 to $40.00 $40.01 to S50.00 $50.01 add above $1.25 $2.00 $3.00 S4.00 $5.00 S6.00 $7.50 SORRY Nd orders accepted outside of USA & Canada Number of books ordered |_j Total price ol merchandise Sales Tax [New York State Residents only) Shipping (see chart) All payments mutt be in U.S. hinds .$. ...I. $. Total Enclosed ..%- 42 RE-SHOPPER Call £or Outstanding Pricing on Tailored Computer Systems MOTHERBOARDS ■ XT - J66 • 366 • 496 «. Bmhl TurfcO. IM Mil. B slots, WBIOSJ CPU XT tDmlKTwta. a 64t*Mai > ilnls. •-UDS * CPU Dim BEST SELLING VLSI 1IMHZ MOfHfRBMfil] Omni !SS. &vs to imti, s sios AMI sios Bur itn 139 *T. M6-I3. UitiySt. (J*5 ftttumb, MM CHIP, EEMS, SUM J39 H 216-1!, Bioy SZ. Ows Oi U Smb. NEAT CHIP. EEMS. Stud US AT. 386-1 6si Batty Si. 6*5. * to ami NEAT CHIP EEMS. Shu. 365 AT. 336-1533 33L dine Ditty Si OK. to t&rns. B Skits. AMI BIOS 1 '33 1S75 CONTROLLERS fOC-2, 360X.720K, HTtMy 14 LONGSWNT. FOC +. 3S0»C72OK' 1 . Zmb.'l .Mmb.KT'AT 31 SUPER fOC. Control 4 Internal Dims. 3CT.AT All Drive Types CMnCTKMO It. 4 Drives. 36OK.1J0K 1 Jmb 1 44mb . . 94 COMPWnCMD II. Ca-Eii9. Ms 2 Dr. Ml TnHl 75 COtlPACTtCARO IV. 4 Dt. All Typtj. CO'Eiist or SUM Atom Bool From Any Drive. Easy InstHlalipn .... 112 LONGSMINE 62111 HD. Clrls 2 H.O. MFM. XT Ontr 43 WESTERN DIGITAL XT-SEN. Cms ! »D. MFM, XT 53 WESTERN DIGITAL 27X Cuts 2 H'D. RLL. XT 61 WESTERN DIGITAL I0O3-MM?, !FD?HD fct, MFM. AT . ID: WESTERN DIGITAL tOtS-MMJ. 2F0IKU. 1:1. MFM, AT IIS WESTERN DIGITAL 1MU-SR2. JT02HO. M. RLL. AT IS WESTERN DIGITAL 1006-SB?. 3FD?MD, t:1. Bli AT 142 LOMGSHINE 622D, 2FC-2HO, XT Only ...__.. 75 LONGSHINE «62i . iFO «H0 , 1 . 1 , MFM . AT 73 WA-3. 2FU'2HD, 21. MFM. AT TS WAWR. 7F03HD. I 1, HU.AT ..IS WA-6. 2FD2HD. 1 1, MFM. AT ,., 77 DTC 72S0. 2F0IIHD. 11. MFM. AT » DTC72S7. 2FO'2HD. 1:1, RLL. AT 131 POWER SUPPLIES 150* XT, StiiMMro Sue tor PC. XT Systems 38 ISO* XT, UlAODtOWU „ 45 HKw XT, Sunoard FIT/sinL Sin tot PCXT ... 48 2tMwXT, UL Approved S2 280W AT, Standard Pfiyscat Sin tor I8M AT 54 220w AT. UL AptflMd 62 FLOPPY DISK DRIVES TEAC 360K, 5-1:4, FD55BR, BHci.Sieoe, (Bestl 66/68 TEAC 1 2mtj. 5-1*. FD55GEA. anotBllc*. IBesl) 78-80 TIAC720K. 3-12 ED235SF mill 5-1:4 Kit. Seoe Only 66 TEAC I.«mt, 3-1'2. F0235HF, *nn 5-1:4 HJIAiejt ... 7B FUJITSU 36CJK. 5-1:4. M2551A. Blacfc'Bieoe 63-S5- FUJITSU t.2mb. 6-US, M2553K. Blsgi 73 TOSHIBA 720K. 3-1.-2. N035J5. wXlt. Blac&Siege 69 TOSHIBA 1.44niB. 3-112. N03MS. Willi. endcBlegi SO MINI MICRO 1 2mb. 5-1.4. MMFD-560K Bieoe.MIn Samsung 74 HARD DISK DRIVES On* . fl LL, Mlre-MiHO-Mlrj . by Samsa nn . 3.25 HH w-5 . 25 kit, 35ms 239 40«mn. MFM-flLL, MITSUBISHI MB535. S.25 HH. ItSi trull Tflnrs ShtKfcmcHintfld. Will Coil, Surface Maunled TKJinolorjy. 347 SEAGATE 20mb, MFM. ST-225, 5 25 HH, 65ms ' Dr Only: Wctlr 205<259 20mb. MFM. ST-I2S. 3.JS HH «S !i hi. 40tnS26tiis . . .. 235-2M ZOmb. RLL. ST-225R 5 25 HH. 70ms * Dr. Only' w:drt 199.244 30mb. BLL, ST-23SR. 5.25 HH, 55ms " Dr. Only: wan 219'2*2 30mb. MFM. ST-13IB, 3.25 HH w:5 25 kll, JDIln 281-299 39mb, MFM. ST-138. 3.25 HH w<5.?5 ht. 40ms^Sms 294'31J 40mb, FILL. SI-260B. 5 25 HH. ?Bms W controller (XT) 312 »mb, MFM. ST-251, 5.25 HH, 40rm.-28ms 315 40mb. MFM. ST- 151. 3 25 HH w-5 26 kit. 24ms .... .394 60mb. RLL, ST-277R-1, 5.25 HH. 2Bms (ESmb) 388 JOrnb. MfM, ST-4097. 5.25 HH. JSms SOS VIDEO DISPLAY CARDS MONOCHROME GRAPHICS Card. n.'Par Port. LPT1 J1 MONOCHROME 6RAPHICS Card, Parallel Pitt. LPT1-2 or 3 .. 29 DUAL VIDEO Card Allows 2 Monitors to Fkjo on k Single Card 75 DUAL MONO COLOR Gushes Org. 2 m one Card 35 C6A Color Gtapbcs Adaptor. No Printer ftKt 24 EVEBEX ENHANCEfl. S4O1350. No Printer Port 112 SUPER EGA OEM. BWitJDtJ. Amo Switching 75 VGA GRAPHICS KHMOO SUPER VGA t024i7E8 IFjSrt 112 VI PAT1. BOOrtSO. Jfln 256 . . 179 ATI. OEM. 1024x768. IBM. 2S6K. (VIEW PEFtFfCT) 206 ATI VOA, OEM. 10241763. I6BB, 2S4K, w.MouSt. (VP1 230 VGAeooiSoa (Oaki, 168H .. as FMBS MOBILE BABY SITTER PortahlG Wlrol«s$ Won Ho ring System -■ gA fiLWfiYS flT fi DISCOUNT Quality & Service to the Smart Mail Order Shopper for over 4 Years . 76 . 79 112 no 130 22S W IAS MQNfTORS ALL OEM MONITORS MANUFACTURED BY SAMSUNG MONOCHROME IT yondli 1200. 720i34B, unb T.-S 12' MM OEM 1252. 720x350. AMB . , Tilt t Swivel 14' MM OEM 14S7, 7201350, AMB, -WW, Flat Scr. T S . 14' VOLTRON GM-1489. 720x350. AMB.rWllt. FrS. IS 14 " EVEnVISJON. 720x350. Amb . Flat Screen. TiS 14" MMM DEM MM1464K. 540x200. .52 Dot. T'S 14 MM OEM MMMI4S4W. 840x200. 41 Del. TS 14' MM OEM 1453M. 640x200. 31 Dot. Til 5 Swivel 14' RELYSIS RE-5154. 640X350. 31 Dot. ISesi I'litei 379 14" NEC 3D, 1024H768, ,2B Dot. AnltKjTrl.rS 649 !4'VIEWPEBEECTVP3.1024x768..29Dot.S0NYTljbe.Sharp 539 14' RELVSIS RE-515S, BOOielOO. 31 Out. fcTTl.TfSA -495 14' VIEW PEHEECTVP-2. 640x480. 29 Analoo.TrS 349 14' RELYSIS RE-9513. 720x480. .31 Dot. Analoo. TO 379 14" MM OEM 14531. 720x400. .31 Dot Analog. TS 379 14' NEC 2A. 800x600. .31 Dot. Analog. Till 5 Swivel . 545 IHPUT.OUTPUT - MULTIFUNCTION CARDS SERIAL Card. 2 Pins. 2nd Port Opl.. COM 1 12(fttr XT) ..13 SERIAL Clffl, 2 PUIS, 2nd Port Opi.. COM 1-4 (XT) 16-21 SERIAL Card. 4 Parts. 3rd I 4th Port Dpi. COM 1-8 (XT AT) 5995 2nd SERIAL Port Opt.— Cable 3 Chip Set— Pm Connector Conng. required lot pmpet cable XT:AT 1015 PARALLEL PAINTER ClM. LPT1 OnlytlPT 1-2-3 (XT.'AT) J'15 GAME CARD. 2 Farts Alow; Anacf-mint oi 2 Joysr-es 11 CLOCX Card, Calendar A Clock One/. Fits inn A Slottpiimine/ XT) 12 AT ID *1. 1 Set, 1 Pai. 1 Game. COM 1-4, LPT 1-2 22 AT HO #3. 2 Sn. I Par. 1 Garni. COM 1-4. PLTt-2 27 AT I'O 14 2 Serial. 2 Parallel, COM 1-2, LPTI J 3S Ml PLUS. CBxk. Calendar. Palatial. SenM. Game [tor XT) 37 3S4K MULTI 1:0. 0, To 384X, Cal. Clk. Ser. Par, Game (XT) 69 MULTI 10. w:Floppy Ctlr. Cal. Set. Par. Game (XT) . ... 33 SUP{H MUltl 10. w-FIOBpy Ctlr— Controls. 360:720k. 1-2 and l 44mb FDD. Cal Clk. Ser. Fat, Game Paris (XT) 59 BARE BONES XT IDmru Desktop Earn writ Sys.. XT:AT Like Case. 101 K:B. 150W P:S Floppy Ctlr. 360 Floppy Drive. 256k Memory . 279 AT2M 12mtu 286 Desktop Barebone System. n 4mb Ms. 0, Full Slit AT Case. 220w P-S. 101 Enhanced Keyboard. Floppy'Hard Olive ContDller. 12mb Floppy Disk Drive 499 MODEMS 1200 GVC. Inlemat. with PC TALK III Software 46 1200 EYEREX. Internal, wilh BITCOM Sotlware 74 1200 GVC. External, wnh PC TALK 111 Sotwaie S9 I2O0 GVC. Ememai Pocket Modem 70 2400 DEM ZOOM. Internal wnn PC TALK HI Software 9t 24W EVEREX internal willi SITCOM Software 138 2400 OEM ZOOM. External with PPOCOMM Sortwire 105 24O0 GVC. Exlemal. with PC TALK til SortwaiB IDS) 2400 GVC. EMernal, with PC TALK III MNP Class 5 IBS 24O0 EVTREX. External, with BITOOM Soltwjte 199 SOFTWARE MS DOS 3.3 W.-GW Basin. OEM Version 59 MS DOS 3 3. Attllll MICROSOFT 84 MS DOS 4 01 w GW Basic OEM Vet Sinn— No Basic Manual 53 MS DOS 4 01 W'Muil MICRSOFT Sim-No Banc Manual . 82 MOUSE - TRACKBALL - SCANNERS 0M0OSE MOM Stream Une 2 Butlon Semi ,. 24 OMOUSE X-30M Stream Line 2 But Senal Deluxe vDR Halo 31 OMOUSE I-30S Sinsam Line 3 Button Serial 25 OMOUSE X-30S Stream tine 3 But Senal DeJuxe w:DR Hato 33 GENIUS E M-6O00 .OR Halo III .13 Bui Ope tation, 360-1050Fies.9-25PmAdp.38 GENIUS GM-6X. DH, Halo IS LOGITECH 0-9. Pop-up DOS S-W. 50-19.000 Bee. Ser Bus 7515 MIGHTY TFACKBALL, OTRONIX. DH Haki S*. 9-25 Part Adaptor a9 LOGITECH TRACKMAN, 50-15000 plus DPI. 3 Button. Software Ser. Bus . 95 Mouse Pocket, Slote Your Mouse When tat in Use 3.00 Mouse Pad. Soh nr Hard 3.00 Mouse Stage. Padded Sage Pitted ever t e tor Mouse 9 50 PS'2 Mouse Adapuir 4.00 Joystick Magic 909 ISM 5 ComiUtldH'MlJIC 909A IBM/Apple 15717 Dealers Wanted •UL -PLJHP D5E DUST CLEANER with $ $LIP-ON ADAPTOR TOOLS BLOWS AW4%r DUKT PARTICLES FROU: VCR S - COMPUTERS - CAMERAS Hi DVS IB KEYBOARDS WMI-SWITCH BA key (n^toa) „.. 42 MAXI-SWITCH 101 KoyfTha BtM^ „„,., 50 KlYTfiONICS 301 Key [e^ttnlen!) 4& NIC SPECIAL 101 KEYSOARQ TidilfrCiKx 12 RirrCtnn Kiyi w itt SuK. OthBf Suwlnra AD Pritt S99 Kflyboarts Oitr Met »5 «4 KEY KEYBOARD, Nor^i* _ & W KEY CMICOMY. Tsctleft'ClkGk 3,95 Parade! Primer Cable 6; Molded 4.95 Rvailri Pnnier Cable to; Mowed 5.95 Panild Punier Cable, Centronic to CBnlronlc. 6 : 5.95 Senal Modanv Caws. 5. Male to Fermie . .. , 4.95 Senal Modem CiWe, W ( Male to Female .. 6.95 AC POWER CQP.O. For Power Supply 10 AC Oifltt 3.D0 Y Cable. Adaptor to Expand No oi Ftwer Output* pi P/$ 3.00 Kiyboan) Extention Cable. 6, r i0 : ' , 2.95^3.95 Monitor ExpaflsiiM Caaie Elmo 3.9&-13..S5 Serial Pan Adaptor. 9 Pin Female to 25 LPin Male 5.00 Gender Ci«nDBp*TtrCl»s and umple dirt Tram ham to reach areas Attach appropriate aftaptor from tools lumlshed and Blow Master cleans VCfl heaids, computer xeyboards, terminals:, disk dnves. cam- era optics 100 dozens ol other delicate devices Includes a fjftiih attactimem 2 M bite hot jndudeti] 7.95' Racing Battery This 7.2V t2fj0mArl batnFy is a first grade battery lrom Uu matched, twin tio seta, to Ihe heay> duh/ high lemp. silicone wire leads. Firs] ling racing parts buih to high standards 19.80* Powerhil solid state ampullar. Features, mctutifc :buili-ui switch- selecrjbie itanrr siren, wtiistle, lig.11 pisroi gnp press to lain switch, vol control, and shoulder strap . BC cell bine riesjjiot soppl DELUXE WEQAPHOHE 129-95* WITH SIREN, WHISTLE ft LfGHT ^^ "'"*" ®f. BeHJta, 3-lrl iV(l 3rt"ltK. wo Ban «i:'ijr m«» Etfect Ranee 1?oa Fl 2115 Old Oakland Road San Jose, CA 95131 One year warranty unless otherwise indicated. • '30 day warranty. XT* AT" 4 IBM' Are ReQnlffred Tredemerlri 01 International Guelneet MicfvlnM. * Ptieea en eubjeel to ellange wilhou r nolict. $1 Rebate per $100 on all phone orders (ex., $5.00 rebate for $500 order) 408-432-7380 TECH SUPPORT 408-432-7557 FAX 408-432-8622 Call or wile for shipping delmts A S3 00 handling charge is applied Io all orders plus a minimum ol S4 00 Ireighl GEMS will ship UPS. FFD EX or any other recognized teighl service f5°o resfocfcrfig fee applied to good relumed merchandise tor refund In Business Since ?9B5 ■ A member of the Chamber of Commerce RE-SHOPPER 4 'Parts FANTASTIC BUYS !! CABINET CARPET . ™a =tanfi cabinets just like the pros. N« y^ «" — **3Z % ; £ ?o P l Id, particle board, etc Carpet-like covering .s easily cut a ^f* Sold by the linear yard, provides protection and good looks. M wioe #RN-260-765 (Black) itoM.9fin.767 (Charcoal gray) HI POWER SPEAKER WIRE $r PIN CONNECTOR Extra large 12 gauge speaker wire for use with very high power stereo systems or for extremely long cable runs. Rope lay construction consists of over 250 strands of 36 ga. wire. Please order in multiples of 5 feet. #RN-100-151 J-Z- G^pl at e dpincorlneciorfor Original Sanw> 1 s- , / — ^ c «e., ent ^^oferw ltn p aper surround, is oz ' = ap and lr eatecf cloth P^#S38Ff 2 I, t '• ^^ *d Mm , * Net weight: 6 Jbs. Jj $19 95 POLYDAX TWEETER This 1/2" ultra-light polymer dome tweeter is active horn foald. Features aterrofM cooledjormerlessvo.ce coil. Thistweeterexhibitsaw.de dispersionangleandexcellent transient response. 8 ohm. SPL:91.3dB. 40 watts nominal power handling. £ 39c #RN-090-225 Foot P,0N EERlifiifS' Mylar dome, 2.93 ° 2 - barium ferrite ™agn et . 8 ohm. Frequency response: 1,800- * M ° 00 " 2 - 35 watts "MS, Pioneer #ah E60-51F. Net weight: 1 lb. JLRN-27o^n 5fi/^ 95 PIONEER MIDRANGE Tuned cup midrange. 9.3 oz. ferrite magnet 50 watts RMS, 70 watts max. Fre- quency response: 320-6,000 Hz. 8 ohm. SPL:94dB. Pioneer #B11EC80-02F. Net weight: 3-1/2 lbs. #RN-280-020 $3 "cTbineTcorners 95 square. #RN-270-110_ $6 95 High quality, zinc plated PA cabinet corners. Made of heavy .047" steel. Made in U.S.A. #RN-260-710 58c $9 95 3-WAY 200W CROSSOVER, Excellent crossover for high power speakers. Woofer section rolls-offat800Hz. with a 6 dB slope, while the tweeter section utilizes a 12"SUBW00FER Dual voice coil subwoofer. 30 oz magnet, 2" voice coils 100 watts RMS. 145 watt max. 25 Hz resonant frequency 6 ohm impedance (4 and 8 ohm compatible). Sensitivity; 89dB. Response: 25-700 Hz Pioneer#A30GU30- ' 3. Net weight- 6 lbs #RN-290-145 $39 80 irtMi.MM.. Bitting M1V.V IFHkElSKTMl 12 dB per octave roll-off at 4.500 Hz. For the midrange frequencies this crossover uses a- true band pass filter with a response of 750- 5,000 Hz. All crossover frequencies are rated into a 8 ohm load 50 #RN-260-230 $27 ! SPEAKER BUILDING BOOK Completely revised and updated to reflect the latest trends in audio technology, this new edition of David B. Weems' bestseller (more than 35,000 copies in print) will guide do-it- yourselfers through the building and testing of low-cost speaker systems that rival the most expensive units on the market. 224 pages. PARTS EXPRESS 340 EAST FIRST ST. DAYTON, OHIO 45402 LOCAL: 513-222-0173 FAX: 513-222-4644 CALL TOLL FREE 1-800-338-0531 Special prices expire 1/31/91 #RN-500-021 WS4 - 44 RE-SHOPPER 'Parts SPEAKER TERMINAL L" #RN-260-300 39c 10" PASSIVE RADIATOR Passive radiators can be used in conjunction with smaller woofers to produce improved bottom end without the added expense of large low frequency drivers. #RN-260-405 $5 6 2^Si^ Polypropylene woofe Bndgeteas design toSK. ma9TOL Grange and lvrZe£l r T puncfl ' 3 " capabflfty: 60 watts rR^* ha ^ling $39 80 ' 90 [™-265-240 8" THRUSTEI id ™°S^ RMS. 1-1/2" 6 ohm. 50 watts #RN-290-053 Net weight- $22 50 18" EMINENCE WOOFER Bibbed paper cone with ^» treated cloth accordion surround. Giant 1 00 oz magnet. 250 watts RMS, 350 watts max. 3", 2 layer voice coil. 8 ohm. fs = 30 Hz. Frequency response: 27-3,500 Hz, Net weight: 26 lbs. CARPETED TRUCK BOX PAIR These quality, _____^ carpeted truck boxes are made of high density acoustical grade particle beard. Each box is cut to accept an 8" woofer and port. Speaker terminals and handles are included. Dimensions: 19" x 1 3" x 5" (tapered front). Sold in pairs. Net weight: 22 lbs. per pair. #RN-260-455 $39 95 -290-200 $99 80 6" X 9' BOXES 100 WATT "L" PAD Allows you to adjust the relative volume of individual drivers in a speaker system while maintaining a constant 8 ohms impedance. Com plete with faceplate, knob, and instructions. 2-WAY 100 WATT CROSSOVER This crossover #RN-260-265 $5 90 ^dphoneTco™ 56 ^mastic ?Z° Und features a crossover poi m of 3, 000 Hz VfthatedB Per octave roil- off for the low Pass and s r hd _#fiN-260«T95 $6 5 ° ONE S P-MS-KS& KSS22-S fl -.nt or cover to your I king, u h q S fere 50/#r w , paint for large lbs. per pair- magnet speake' rs. Net weight: use with > as wew. I &R N-260-450_ PARTS EXPRESS 340 EAST FIRST ST. DAYTON, OHIO 45402 LOCAL: 513-222-0173 FAX: 513-222-4644 $12 warranty 24T-02Q Portable 'year $9 95 ^edpa P .-^^ 20 SSuency respond J^ 95 lNe tweigW'.5lbs. ORDERING INFORMATION • 1 5 day money back guarantee • $1 5.00 minimum order • We accept Mastercard, Visa, Discover, and C. O. D. orders. ■ 24 hour shipping ■ Shipping charge = UPS chart rate + $1 .00($3.00 minimum charge) ■ Hours 8:30 am - 7:00 pm EST, Monday - Friday, 9:00 am - 2:00 pm EST. Saturday ■ Mail order customers, please call for shipping estimate on orders exceeding 5 lbs. • Foreign customers please send $5.00 U.S. funds for postage when requesting a catalog ■ CIRCLE 262 ON FREE INFORMATION CARD RE-SHOPPER t Enter A World Of Excitement with a Subscription to Po pular Electronics Get the latest electronic technology and information monthly! Now you can subscribe to the magazine that plugs you into the exciting world of electronics. With every issue of Popular Electronics you'll find a wide variety of electronics projects you can build and enjoy. Popular Electronics brings you informative new product and literature listings, feature articles on test equipment and tools— all designed to keep you tuned in to the latest devel- opments in electronics. So if you love to build fascinating electronics, just fill out the subscription form below to sub- scribe "to Popular Electronics . . . It's a power-house of fun for the electronics enthusiast. EXCITING MONTHLY FEATURES LIKE: □ CONSTRUCTION— Building projects from crystal sets to electronic roulette □ FEATURES— Educational training on digital electronics, Ohm's Law, Antennas, Communications, Antique Radio, Simplified Theory □ HANDS-ON-REPORTS— User test comments on new an unusual consumer products □ SPECIAL COLUMNS-Think Tank, Circuit Circus, Co puter Bite, DX Listening, Antique Radio, Amateur, Scannei Scene PLUS: ALL OUR GREAT DEPARTMENTS! You'll get 12 exciting and informative issues of Poputar Elec- tronics for only $18.95. That's a savings of $16.45 off the regular single copy price Subscribe to Popular Electronics today! Just fill out the subscription order form below. FOR FASTER SERVICE CALL TODAY 1-800-435-0715 (7:30AM-8:30PM) EASTERN STANDARD TIME [Po pular Electronics" subscription order form ] P.O. Box 338, ML Morris IL. 61054 YES! I want to subscribe to Popular Electronics for PLEASE PRINT BELOW; 1 Full year (12 Issues) for only $18.95. That's a savings of $16 .45 off the newstand price, r-T NAME □ Payment Enclosed Q Bill me later Please charge my: QVisa □ Mastercard ADDRESS Acct. # 1 cm" STATE ZIP Signature Exp. Date Allow 6 to 8 weeks for delivery of first issue, U.S. Funds only. In Canada add 15,00 Pnstagt All Other Foreign add J 7.50 Postags ASPA1 SPECIALS LIMITED QUANTITIES CABLE CONVERTERS SIGMA SIGMA 550-86 CHANNEL $ 99.95 EACH TOP CHANNEL ROLLOVER, LAST CHANNEL MEMORY, PARENTAL LOCKOUT, FAVORITE CHANNEL, SURGE PROTECTION, 4 db AMP, DECODER COMPATIBLE, 1 YEAR WARRANTY. 3>7"."5 EACH SLOT $75.00 EACH 10 LOT $67.50 EACH 20 LOT $65.00 EACH 50 LOT YIEWSTAR IS HERE MXC-2520-525 MHZ remote volume remote volume control Audio/video Baseband $129.95 ea. Output, decoder loop $109.00 5 lot Parental Lockout $100.00 10 lot Favorite channel $95.00 ea. 20 lot Remote Fine tuning NEW "North Coast" 'Excel' 66 channel remote $109.95 ea Fine tune remote, 60 min. Sleep timer Display dimmer. Favorite channel Parental Lockout, HRC/STD Remote $89.95 5 lot $79.95 10 lot $75.00 20 lot Selectable Twinline A/B Select UNITED ELECTRONIC SUPPLY P.O. BOX 1206, ELGIN, IL 60121 (708) 697-0600 CIRCLE 256 ON FREE INFORMATION CARD RE-SHOPPER 47 SPECIAL FROM ETT n PCP1D1— PRACTICAL DIGITAL ELECTRONICS HANDBOOK ... $9.95. In- troduces digital circuits, logic gates, bistables and timers, as well as micro- processors, memory and input/output devices. Spe- cial section on digital test gear protects. [ ] PCP102— INTRODUC- ING DIGITAL AUDIO ... S9.95 Shows what is in- volved in the digital part of audio signals, particularly m Hie newest devices such as CD, DAT and sampling. Bridges the gap of under- | standing for the technician I and enthusiast. D PCP103— PRACTICAL MIDI HANDBOOK ... 19.95. Covers all MIDI based equipment you can use— keyboards, drum machines, sequencers, effects units, mixers, drum pads and guitars. Also a section on comput- er music that covers soft- ware and more. D PCP1B4-ELEC- TRONICS BUILD 4 LEARN. Second Edition ...S9.95.Vou start by as- sembling a circuit demon- strator that is then used to build and investigate a va- riety of useful circuits in- cluding oscillators, multi- vibrators, bistables and logic circuits. D PCP105 — MAKE MONET FROM HOME RE- CORDING. ..S10.00. Now that you've spent all that money on all that record- ing gear, wouldn't it be nice to get some of It back? Well here's the book that can show you how. □ PCP106— SYNTHE- SIZERS FDR MUSICIANS ... $10.00. All current popular forms of syn- thesis explained; LA, ad- ditive, phase distortion, FM and sampling. Get the sounds you want from your synth. Written es- pecially for musicians. MAIL TO' Electronic Technology Today, Inc. P.O. Box 240 Massapegua Park. NY 11762-024O SHIPPING CHARGES IN USA AND CANADA $0.01 to $5.00 .$1.25 $30.01 to $40.00 £5.00 $5.01 to 10.00 $2.00 $40.01 to 150 00 $6.00 $10.01 to $20 00 $3.00 $50.01 and above $7.50 $20.01 10 S30.00 $4.00 SORRY, No orders accepted outside ol USA and Canada Total price of merchandise Shipping (see chart) Subtotal Sales Tax (NYS only) Total Enclosed Name Address . City .State . .Zip. RES RIGHT-ANGLE D-SUB CONNECTORS. 3Ms line of right-angle D-sub con- nectors increases printed- circuit board design op- tions with a wide range of sty les for computer and pe- ripheral board-mount ap- plications. The connectors are available in four product families: 0.31 8-inch- footprint sockets and plugs in 9, 15, 25, and 37 posi- tions, 10- and 30-microinch gold plated; 0.590-inch- footprint sockets and plugs in 9, 15, 25, and 37 posi- tions, 10- and 30-microinch gold plated; high-density socket only, 15 positions in 9 -position size; and stacked, with two 9, 15, or 25 positions, or 9 over 25 positions, socket/plug, socket/socket, plug/plug, or plug/socket. To ensure reliable elec- trical contact, all have sealed backs to protect against solder and flux en- trapment. Each con- nwCvor has a tin-plated metal shell for high-quality shielding. In addition, fric- tion dimples on the male connector's metal face pro- vide ground continuity with the mating connector for effective EMI shielding. The dual-wipe, clover-leaf contact design assures a good connection, and rigid tin-plated solder tails elimi- nate bending and aid in alignment with PC board hole patterns. Optional fea- tures include inside or out- side ground straps, board locks to hold the connector securely in place during wave soldering, and 4^40 inserts to offer still more design options. The 25- position right-an- gle female connector with CIRCLE 25 ON FREE INFORMATION CARD metal face and 10- micro- inch gold plating costs $1.80 each in quantities of 5,000. (Contact 3M for pricing details on other styles and quantities.) — 3M Electronic Products Division, P.O. Box 2963, Austin, TX 78769-2963: Tel: 800-225-5375. WAVEFORM RECORD- ER SYSTEM. For use in laser physics, high-voltage switching, material testing, NDT testing, ultrasonics, telecommunications, and speech analysis, Rapid System's R1222 waveform recorder system has a 2- MHz sample rate at 12-bit CIRCLE 26 ON FREE INFORMATION CARD resolution. The system has a large data buffer Cup to 1 MEG words) and easy-to- use, Windows-based soft- ware. Dual timebases allow users to digitize fast and slow events at the same time. The R1222\s modular from 4 to 32 inputs. The recorder system offers sig- S RE-SHOPPER (F Atari 5200 Trak-Ball Controller Use with your 5200 game or build your own computer mouse. Unit comes with heavy snooker ball running on five precision bearings. Two opto-isolators translate the rotary motion into x.y coordinates. IC's are: LM339. CD4011, CD4013. CD4030, CD4538. Unit also has two twelve- button keypads in addition to a bank of two buttons below each keypad. New, in original carton, with instructions. S 12.95 each 50-LB. CARE PACKAGE Surplus goodies from Silicon Valley. Elec- tronic and mechanical subassemblies from robots to rockets. This is not junk, just material we've acquired in quantities too small to catalog — IC's caps, diodes, resistors, transistors, connectors, springs, etc. Most items are unused. 50 Lbs. for $49.95 * SILICON VALLEY GOLD * Over 50 pounds of printed circuit boards from computers, monitors, modems, test, RF and microwave equipment, all stuffed with goodies such as toroids, IC's, switches, sockets, connectors, oscil- lators, crystals, transistors, diodes, varactors, varistors, etc. A gold mine of usable parts. 50 Lbs. for $49.95 IBM-Compatible 84-Key Keyboard For XT's with dual cursor control/ numeric keypad. $24.95 each Protect Your Computer . . . Fax . . . Copier . , . From Power Surges SOLA 250 Watt Micro/Mini Autotrans- former / Line Conditioner 85-135 VAC in and 110 VAC out. +/- 5%. Used, good condition. $44.95 each Morse Code Trainer/Keyer Kit Learn Morse Code faster and easier with this easy-to-build kit. The 8049 micro- processor will send Morse Code at any speed you are comfortabte receiving. Attach your Iambic Paddle and practice your sending. Connect it to your trans- ceiver and use it as a Digital Keyer. Comes with instructions and 73 and CQ article reprints. Reduced prices . . . Starter Kit — PC board, micro- processor, documentation $12.95 AN Parts, except power supply. enclosure $27.95 Power Supply, +5V @ 1.2A, + 12V @ 0.4 A $ 9.95 EVERYTHING, except enclosure $34.95 Build Your Own Music Synthesizer Matsushita keyboards, four octaves, full- sized keys, as used in Sequential Circuits and other synthesizers. Comes with tech- nical and operating manuals. $24.95 each 250 Watt Transistor Complementary pair MJ15024 and MJ 15025, 250 Volt, 16 Amp transistors used for Hi-Power Audio and other Linear Applications. Application notes included. 2 Pair (or $9.95 Ultrasonic Transducer Experimenter's Kit Includes a transducer and over 80 pages of application notes. $29.95 BOOM MIKE Electret condenser type. Easy to hook up to your handie-talkie, PA system, tele- phone, etc. New, with diagrams. $4.95 each GOBS OF GOODIES ! ! ! Studioline Stereotrak II Cable TV Adaptor Separates stereo signals from the cable TV input, feeds TV signals to TV/VCR/tuner and stereo signals to FM (either RF or fixed/variable level audio). Inside are hundreds of useful parts which may be removed for audio/RF projects. Control- ler board has CPU and socketed EPROM as well as Mitsumi varactor tuner. Cable/FM separator board. Regulated power supply sub-assembly, Channel select board. Stereo separation output board. Black metal case, 14" x 10" x 3". Only $19.95 PAY RADIO ??? CODART Pay Radio Decoder, part of a system that broadcast pre-paid stereo programming. These units would activate one of two tape recorders when a coded tone was received. When one cassette stopped, the second unit would be enabled to complete the recording. Contains a Z-80, 4K EPROM, 2K battery- backed RAM, 18-key keyboard, 8-digit display and relays for the recorders, Reprogram it to control stereo, TV usage, timing, and appliance control. New units with manual and schematic. Two for $19,95 Power Factor Controller POWER PINCHER can save you up to $20 each per month. When used with refrigera- tors, washing machines, furnace and attic blowers and motor-driven tools, this NASA licensed device can reduce the energy required by the appliances and tools by up to 60%. Maximum power load 750 Watts. $19.95 each V ALLTRONIC S 2300 ZANKER ROAD • SAN JOSE, CA 95131 Terms: Orders shipped U.P.S. C.O.D, plus shipping unless other arrangements have been made. VISA/MC/AM EX cards accepted. Minimum order $12, 00. California residents add 7%%sales tax. Phone (408) 943-9773 • FAX (408) 943-9776: J CIRCLE 258 ON FREE INFORMATION CARD RE-SHOPPER NEW • USED • BUY • SELL • SURPLUS • DEALS Components To Computers IEE Flip TM Motorola 2N6051 Vacuum Fluoreescent Display Module. Features microprecessor controlled 8 bit TTL-ASCII data base accessing 2 line by 20 character 5X7 dot matrix display with lower case with blinking and underline. Regular Price $299. ACP Only $99 Bourns Trim Pots Fujitsu 128K Bytes Bubble Memory 3/8" single turn Cermet pot. 3352T-1-205 25e each 1 /4" round single turn 3329P-1-503 35* each Special Grahbag! 25 pes (mix) all types potentiometers/trimmers $4" Motorola Pressure Sensor Model MPX50DP Noncompensated piezoresistive. 50kPa{max) range. Differential meas- urement with ported elements, 60mv full scale span 35 mv offset 1 .2mv/kPa sensitivity Mot List $22.86 ACP Only $14.95 8 Isolated Resistors 16pin DIP 4116R-1-512 (5.1K) 19c 15 Bussed Resistors 16pin DIP 4116R-2-223 (22k) 19e Call for all your resistor networks! We have over 500,000 in stock. Darlington Power Transistor. ACP Special Price Only $2.25 QtylO $1.95 Resistor Network Special P/N N16B-841WCI/02 Model #FBC 501 M*E Bubble memory module on card is P/N FBM54DB. We also have a few motherboards with modular power supply that accepts card shown above. 22 pin edge connector 128K Bytes Card Only $99 Motherboard ..$49 Manual add .... $5 Only Corcom RFI Filters We have with straight tab terminals or Right angle, rated 3A/250V 3EF1 $2.50 3EF2(rt angle) $2.95 Call for more types and styles. We have over 100 models in stock Motorola Bridge Rectifier MDA 990-2 35A at 200V tab leads. ACP Only QtylO $2.25 $1.75 AC Connector Flange mount female connector. Tab terminals rated 6 amps/250v. 6ESRF-3 ....69c Rayovac Lithium Batteries Popular replacement for most PC add-in cards. All factory fresh BR2325-T2. $1.25 BR2325(no leads) $1.35 844 PC replacement $9.95 Line Cord 3 Conductor shielded PVC Jacketed Power Cord 8' length ACP Only $2.50 6' length (w/o receptacle) ACP Only $1.50 ACP since 1976 has in stock the largest and broadest selection of components and computers in Southern California, We are both wholesale and retail. Our retail facility is 14,000 sq. ft., located near the Orange County Airport. If you don't see the part you need, please give us a call. If you are a reseller or dealer we suggest you call our wholesale division at 714-558-8822. Thank you for considering ACP. Prices subject to change without notice. Quantities limited to stock on hand. Minimum order is SI 0.00. All items new unless indicated. Product may be returned within 10 days from ship date with prior authorization from ACP. Returns must have RMA# and returned with copy of original packing slip and complete with original packaging, manuals, diskettes, etc.. Shipping charges added. Yes we accept VISA, Mastercharge, and AMEX. Advanced Computer Products SINCE 1976* 1310 E. EDI N G ER • SANTA ANA CA 92705 -800-FONE- ACT* 714-558-8813 -FAX 714-558-1603 50 RE-SHOPPER NEW • USED • BUY • SELL • SURPLUS • DEALS Its Fun To Shop At ACP Switchcraft "Q-G" Audio Connector In fared Emitting Diode T-l 3/4 Infared LED ACP Only ...290 each Qty 10 Only 19* each Slotted Optical Switch Transistor __ Outputs " tt Stainless Finish, 3 contacts, female P/N A3F and QGP-3-22 Compare at $5,95 reg price ACP price Only . Stock Up! Buy 10 Aromat Relay $2.75 each $1.95 each Normally open 3A 250 volts DCSV #AE822908 (Sleads) ACP Only $2.99 each Gordos Dip Relay Standard Dip Relay P/N F81 -1359-2 ACP Only 1.99 each Qty 10 Only 1.79 each Hitachi Laptop LCD Display 8 lines x 40 characters 4l/2"xl0 3/4"L Same as used in the Gavilan laptop. ACP Only $10 LED Bar WwW Gra P h 8 segment. Popular Hewlett Packard type HP P/N HLMP-2785 Bar (Yellow) 69* Buy 25 pieces 49c Right Angle LED's T-l 3/4 LED. Available in single on a bank or 4. Single (Red) 69e Bank of 4 (Red).... $1.79 Power One Series Power Supply 5V@4A 12V@2.5A 110/220 jumper selectable (5 x 8 1/4 x 2 1/2" H) ACP Only $16 1.7 V@ 20 mA standard style SPX1 879-15 ACP Only .. 69c each Qty 25 Only 49c each MASS STORAGE Hard Disk Specials All New! Seagate 20MbST225 $189 30Mb ST238R .$215 40Mb ST251-1 $259 80Mb ST4096 $549 40MB IDE ST157A $279 100Mb IDE ST1144A Call Imprimis 330Mb, CDC/ Wren 150Mb, Toshiba 150Mb in stock at special price Call ACP 10Mb Hard Drive Blow-out! Densi 10Mb FH 5.25" $69 Western Digital Hard Disk Controller WAH 1003. 2/ 3rd size card. New! Reg price $99.00 ACP Only $24.95 @>SB RG 59 Cable Male to Male 20ft ACP Only $2.95 ASTEC Switching Power Supply 115V@2.2A 230V@1.2A 50/60 Hz Output 1 128W Output 2 86W +5V@10A +5V@10A +12V@2.5A +12V@1.0A +12V©3.5 +12V©1.5 -12V @ 0.5A -12V @ 0.5A (10l/2x5x21/2"H) ACP Only $29 Advanced Computer Products SINCE 1976*1310 E. EDINGER* SANTA ANA CA 92705 '800-FONE-ACP* 714-558-8813 -FAX 714-558-1603 RE-SHOPPER 51 ElECtrnnlcs SPRINT BOOKSTORE n 12B Radio-Efectronics Annual 1986 ....... $6.00 □ 125 Radio-Electronics Annual 1985 $6.00. □ 210 Radio -Electronics (1990 back issues) . . S3. 50 □ 109 Radio -Electronics (1989 hack issues) . . S3. 75 (April not available) Write in issues desired D 1DS Radio-Electronics (1983 back issues . . S4.no Write in Issues desired □ 107 Radio-Electronics (1987 back issues) . . S4.50 (January. February not available) Write in issues desired D 106 Radio-Electronics (1986 back issues) . 35.00 Write in issues desired D 105 Radio-Electronics (1985 back issues) . . S5.50 (January, February not available) Write in issues desired D 104 Radio-Electronics (1984 back issues) . $5.75 (December, February not available) Write in Issues desired D 220 Popular Electronics (1990 back issues) S3. 50 □ 119 Popular Electronics (1989 back issues) $3.75 Write In issues desired □ 118 Hands-On Electronics (1988 back issues)S4. 00 Write in issues desired D 117 Hands-On Electronics (1987 back issues)S4.50 Wrtte In issues desired . □ 116 Hands-On Electronics (19S6 back issuesJSS.fJQ Write in issues desired □ tlSA Hands-On Electronics #6 $5.50 a 115 Hands-On Electronics #5 $5.50 □ 114 Hands-On Electronics #4 S5.50 a 113 Hands-On Electronics #3 $5.50 □ 112 Hands-On Electronics #2 $5.50 □ 111 Hands-On Electronics #1 $6.00 □ SPtO Special Projects #10 $6,00 LI SP8 Special Projects #8 SB. 00 □ SP6 Special Projects #6 $6.00 □ SP5 Special Projects #5 $6.00 □ SP4 Special Projects #4 $6.00 □ SP1 Special Projects #1 $7.00 G EH90 Experimenters Handbook (1990) .... S4.00 □ EH87 Experimenters Handbook (1987) .... $5.00 D HH89 Popular Electronics Hobbyist Handbook $4.50 D EH8B Experimenters Handbook (1988-89) $4.50 REPftlHTS REPRINTS O 169 Think Tank (133 Circurts) S3.50 D 169A Think Tank Vol. 2 S3.0D D 168 Fact Cards (#34-66) $4.00 D 168C Fact Cards (#67-99) S3.50 □ 168D Fact Cards (#100-132) $3.58 D 167 Designing With IC's S4.O0 □ 166 Collected Works of Mohammed Ullyses FIps (62 pages, April Fools Collection) S7.50 D 165 How to Repair CD Disc Players $5.00 □ 164 Modern Electrics (April 190B) S3.00 □ 163 Receiving Satellite TV S5.00 □ 162 Build Your Own Satellite TV Receiver $5.00 □ 161 Descrambling (Feb., 1984) $3.00 D 160 New Ideas - 42 Circuits $3.50 □ 159 Low Frequency Receiving Techniques Building and using VLF Antennas $5. B0 □ 158 Electro Importing Co. Catalog (Circa1918) S5.9S D 157 All About Kits $2.00 □ 156 How To Make PC Boards $2.00 □ 155 IBM Typewriter To Computer S2.00 □ 154 How To Repair VCRs $3.50 D 150 Pay TV Decnrder (1981) $3.00 To order any of the items indicated above, check off the ones you want. Complete the order form below, Include your payment, check or money order (DO NOT SEND CASH), and mail to Radio- Electron its, Reprint Depart- ment, P.O. Box 4079, Farrningdale. NY 11735. Please allow 4-6 weeks for delivery, If you need a copy of an article that is in an issue we indicate is unavailable ybu can order it directly from us. We charge 50C per page. Indicate the issue (month & year), pages and article desired. Include payment in full, plus shipping and handling charge. Make checks payable to Gems back Publications, Inc. ARTICLE PAGES MONTH YEAR TOTAL PAGES (J'SOC each TOTAL PRICE MAIL TO: Radio-Electronics Reprint Bookstore, RO, Box 4079, Farrningdale NY 11735 SHIPPING CHARGES IN USA & CANADA SO.01 to S5.00 SI .25 $5.01 to $10.00 , $2.00 $10.01 to 20.00. $3.00 $20.01 to 30.00 S4.00 Total price of merchandise Sales Tax (New York State Residents only) Shipping Charge (see chart) S30.O1 to 40.00 . . $40.01 to 50.00 . . $50.01 and above .$5.00 .56.00 $7.50 Ail payments must be In U.S. funds We only ship to USA & SORRY Canada Name Address . City Total Enclosed. -State . .Zip. RES nal averaging, five pro- grammable input ranges, and extensive triggering in- cluding pre/post, pattern, edge, state, and external. The R1222 waveform re- corder system costs $4995.00.— Rapid Sys- tems Inc., 433 North 34th Street, Seattle, WA 98103; Tel: 206-547-8311; Fax: 206-548-0322. TOOL KIT. The computer- designed Tec-Tuff Kit con- tains a practical assort- ment of top-quality tools in a rugged and durable case. The case features a val- ance design and has a heavily padded handle, a CIRCLE 27 ON FREE INFORMATION CARD three-tumbler combination lock, and recessed locks that will open when the case is right side up. The Tec- Tuff case is 1 8Va inches long and 13'/2 inches wide, and is available in 6-, 8-, and 10-inch depths. Prices for the Tec-Tuff tool kits range from $135.00 to $150.00 — Technt-Tool Inc., 5 Apollo Road, P.O. Box 368. Plymouth Meeting, PA 19462. REPAIRABLE 300-MHz OSCILLOSCOPE PRO- BES. Designed to fit all scopes having 1 -megohm input, Tesf Probes Inc.'s (TPi) thin-cable 300-MHz oscilloscope probes are constructed to allow inex- pensive replacement of failed parts. The modular probes screw together 52 RE-SHOPPER 3931 Edwards Road Cincinnati, OH 45209 Computers, Components, Tools And Supplies Computer Products 1 (800) 423-4499 Free Mouse !!!!! Microsoft Windows 3 bundled with Z-NIX serial mouse Buy Microsoft Windows 3 for 1/3 off the retail price and get a FREE Z-NIX Super Mouse II - This special package deal Includes Microsoft Windows version 3.0 and a Z-NIX 2 Button serial mouse with cable and driver.. Limited Quantity. $99.99 Heathkit Deals... Genuine Heathkit Kits - original packaging with all parts and documentation - Heathkit catalog close-out- Data Line Protector Kit SK202 - Skill Level 1 - Easy beginners kit to help protect your RS232 C lines from voltage spikes and static charge build-ups. 1/3 off! $9.99 Baud Rate Analyzer Kit SK205 - Skill Level 1 - Displays baud rates between 300 and 38.4K - Combination M/F DB25 connector with selectable pin 2 or 3 configuration 60% off! $19.99 Ribbon Blowout... We bought out the stock of a local distributor and we're selling these ribbons out at ridiculous prices - Al! new ribbons in the original sealed packages - no returns IBM Proprinter XL Ribbons - black, wide carriage OKIDATA Microline 292 Ribbons - black nylon, narrow T.I, 810 Rainbow Pack 2 blk, 1 brn, 1 blu, 1 grn, 1 red Diablo Hytype II - black mu It i strike 6 ribbons per box, each box Your choice $9-99 Super Cable Deals.. 6' IBM ptr cable. $8.88 10' IBM ptr cable $12.88 25' IBM ptr cable $24.88 Custom cables.... Serial or Parade! $16.00 + 1.00/foot Any length - Any pinout Software All brand name - brand new software - factory fresh with unbroken seals and registration cards EasyLan 2 - Low cost, easy to install networks using the PC's serial port. Two PC system with cables and software - PC magazine says "Cast Iron Reliable" 1/2 price, $99.99 EasyPrint - Multiple computers, shared printers, background printing on PC, XT, AT or PS/2 or compatible systems - PC magazine says "Best Bargain" Now Only. ....$49.99 Reference File - The first really serious pop-up database management system - perfect companion to 1-2-3, Dbase or almost any other program. Give away price! $9.99 Twin Advanced - Spreadsheet, Graphics, Data Management - File and macro compatible with 1-2-3 1A and Release 2 - much better graphics than 1 -2-3 - over 150,000 sold!! Unbelievable! $9.99 SQZ Pius - The best file utility for 1-2-3 - Shrinks Lotus files by up to 95% - Backup and recover your spreadsheets easily and quickly. Incredible! $9.99 Weller Solder Station WTCPR Professional Soldering Station - Low voltage, temperature controlled tip - Uses standard Weller tips Under Cost $79.99 286 Motherboard... The manufacturer made a one-time deal with us on a great AT motherboard with the latest DFI chipset 12.5 MHz PC-AT compatible system board - 80286 chip running at 12.5 or 8 MHz, hardware or software selectable - 8 MHz bus speed - up to 4 MB of memory can be installed - supports EMS 4.0 driver - baby AT size - coprocessor socket - 3 XT slots, 4 AT slots - AMI BIOS Lowest price! $129.99 CIRCLE 259 ON FREE INFORMATION CARD RE-SHOPPER 3-in-1 Meter DC Volts, Amps, Watts Measured Simultaneously! One low cost meter saves panel space. The APM70W Series, 3-in-1 analog meter uses two isolated meter movements that measure DC Volts and Amps. Where the Volt and Amp meter pointers intersect, DC Watts are read from a calibrated scale on the same meter face. Custom meter faces can be supplied. Only one panel cutout required to mount meter. DC Voltage Range: 0-30VOC. (All models) OC Current Range: 0-5, 0-15 or 0-30 Amps DC Wattage Range: 80, 250 or 500 Watts. ASK ABOUT OUR FULL LINE OF LOW COST METERS. ^ ; ^ K» Challenger Series Master Series Champtoi Series D1 International, Inc. 96 E. Main St., Huntington, NY 11743 Phone: (516) 673-6866 • FAX: (516) 673-6833 P-C-B ARTWORK MADE EASY ! Create Printed Circuit Artwork on your IBM or Compatible * MENU DRIVEN * HELP SCREENS * ADVANCED FEATURES * EXTREMELY USER FRIENDLY * AUTO GROUND PLANES * 1X and 2X PRINTER ARTWORK * 1X HP LaserJet ARTWORK * HP and HI PLOTTER DRIVER optional 49.00 REQUIREMENTS: IBM PC or Compatible, 384 K RAM DOS 3.0 or later. IBM compatible printers. PCBoards - layout program 99.00 PC Route - auto-router 99.00 SuperCAD - schematic pgm. 99.00 DEMO PKG. - 10.00 Call or write for more information PCBoards 2110 14th Ave. South, Birmingham, AL 35205 (205)933-1122 CIRCLE 28 ON FREE INFORMATION CARD without soldering for on- site repairs and provide a more secure contact than snap-together probes. A distinctive, sawtooth- shaped center conductor eliminates microphonics. That design offers superior resistance to breakage from pulling and bending. The cable that is used is thinner and more flexible than those with straight conductors. The 300-MHz probe as- sures precise measure- ments with less than 3% overshoot and 1.2-nanose- cond risetime. Some mod- els have an activator pin for readouts and automatic scale factoring that can be used on scopes having that feature. List prices for the 30- MHz TPI probes begin at $74.00— Test Probes Inc., 9178 Brown Deer Road, San Diego, CA 92121; Tel: 619-535-9292. TOROID TRANS- FORMER TESTER. Atlantic Magnetics' model 3500A toroid transformer tester can be used for in- process testing and incom- ing inspection of transfor- mers and inductors wound on donut-shaped toroid cores. The tester can han- dle just about every avail- able size toroid, ranging from small-signal, 0.060- inch core-inside diameter transformers for communi- cations, up to large, 8-inch core-inside diameter trans- CABLE TV "BOXES" Converters— Descramblers Remote Controls Accessories * Guaranteed Best Prices * * 1 Year Warranty— CO. D.'s * * Immediate Shipping * * FREE CATALOG * Calf or Write TRANS-WORLD CABLE CO. 12062 Southwest 117th Court Suite 126 Miami, Florida 33186 ™SF 1-800-442-9333 /QQ MasterCard |l >4 RE-SHOPPER RAINBOW KITS I THE STRIPPER RADAR SIGNAL DETECTOR If you mink that a sen- sitive radar detector is a complicated piece of equipment, take a look at this new kit. This simple, yet effective, detector circuit can be built In less than an hour and can be tuned to respond to signals between 50MHz to 500GHz. It's a fun kit to build and play with, A cigarette lighter plug Is Included. Size 1"fcl4" operates on 9 to 15v DC. KITRSD-1 $12.95 STROBE LIGBT It you need an attention getter, or warning Fight, you need the strobe light kit. Use It for emergency light tor autos, for model planes or radio towers. Even use It on your bicy- cle. Operates on 6 or 12v DC and has a variable strobe rats. KIT ST- 1 W.95 DIGITAL THERMOMETER Have you ever wanted to tell temperature changes fast I accurately? The DT-1 kit will turn your digital volt meter Into an accurate digital thermo- meter with ,1 degree res- olut lo n . 1 1 g Ives you a 250 degree window with a range frorh -40F to 3O0F degrees, tt has a remote sensor .25" aq. that can be mounted many feet from the meter If need be. KIT DT-1 $fl.95 BLINKKT LIGHTS Infant to attract atten- tion? These kits are perfect for decorating name tags, lighting up your hat, or (lashing lights for your model trains. Some people use them to simulate a burg- lar alarm for autos. Put it In a box, set It on your dash and It looks Ilka the real thing. Each kit con- talnetwoLEDsth at alter- nates flashing. Operates on a Sv battery. Size .5"x.5" KIT RB-2 $3.45 CAPACITANCE METER This easy to build kit will turn your digital volt met er I M o a CAPAC ITO R METER. Turn that Junk box of unmarked capaci- tors Into a fortune. Meas- ures capacitors from (2pF to 2.2uF. Operates on a 9v battery. Size i.re"x2" KITCA-2 $12.95 WIRELESS FM MIKE Small but mighty .8">:1" FOB, will really stomp out a signal well over 400 yds. This is e buffered wireless mike that oper- ates on SO to 120 MHz FM, Comes complete with a microphone, and 9V battery connector. Operates on 8 to 12v DC. KITWM-1 $12.95 SUPH! SNOOFES-BIC far Use this BIG EAR ampli- fier to listen through walls, hear conversa- tions across the room. Beef up the sensitivity with a parabolic reflector and hear blocks away. Due to the size, the BIG EAR can be hidden about anywhere. Use the ear- phones from a pocket transistor radio to listen. Makes an ul Ira-sensitive Intercom. Can also be used as a general pur- pose 1 .5W amp. We sup- ply a mini-microphone in the kit. You can also uss any 5 to 45 ohm speaker. Operates on 8 to 12v DC. Size 1"x1.75" KITAA-1 $10.95 AC LINE MONITOR This is something every computer user, photog- rapher, or anyone that must maintain a safe usable AC line voltage should have handy. Mon- itor the voltage of your motor home's 110v AC generator Inside the motor home. Every tech- nician's bench needs this Item. The AC line monitor will Indicate, with multi-color LEDs, what voltage Is being distributed to your equipment at that par- ticular outlet. KITLM-110 $10.95 i:v BATTERY MONITOR Have you ever been In your car, boat, or camper — you try to start your motor but the battery Is dead? The battery MONITOR kit uaes the cigarette lighter plug outlet to monitor the true battery voltage. Multi- color LEDs Indicate the voltage in tv steps from 11v to 15v, green means great, yellow is good, and red — cell the tow truck or gat out the oars. Size 1.2"x1.75" KIT LM-12 $5.95 PHONE TRANSMITTER Small but mighty, so smell it fits anywhere. Telephone line powered, nwar needs batteries. Transmits both sides of a phone conversation loud and clear, wireless, to any FM radio at great distances away. Variable tunes 70MHz to 130MHz. It can also be used to make any phone a speak- er phone. Size ,55"x1". KITTEL-B1 $10.95 l i l * XXXXX RATED X WE HAVE THE BEST UNIT YOU CAN BUY AT ANY PRICE X ALL AUTOMATIC • NO CONTROLS f{? f CABLE IN — 1 CABLE OUT 'A X USE ON ANY VCR X THE ONLY UNIT WITH THE ENHANCING SWITCH X 100% MONEY BACK CUARANTEE VIDEO STABILIZER PHONE RECORDING SWITCH This telephone line powered switch Is small enough to Install any- where only .fl"x,6". Every time someone picks up the phone the tape recorder will record both sides of the conversa- tion automatically. Use it In your office to record all phone conversations so you don't lose that Im- portant address you wrote on the beck of an envelope. KITTEL-SW1$1095 BUSY PHONE LIGHT Add this little kit to any or all of your phones. Whe n an y e xten sion s are in use the LED will light. Uses a 9v battery. P.C. Board 1"xUr". Complete with etched A drilled PCB, all parts and sche- matics. KIT TEL-LIT-1 $9.95 If you rent movies you need THE STRIPPER When watching rental movies you wilt notice annoying picture flashing from dark !o light, color shifts, unwanted lines, & picture jit Lars. This Is caused by ths copy prelec- tion Installed In the video tape by the manufacturer, THE STVIPPEX completely eliminates alt copy protection and gives you crystal clear copies. WE HAVE THE ENHANCING SWITCH SOME NEW COPYGUARD SCHEMES REQUIRE ADDITIONAL CIRCUITRY TO CLEAR THE PICTURE COMPLETELY OF UNWANTED LINES AND PICTURE INTERRUPTION. THIS IS THE PURPOSE OF THE ENHANCING SWITCH. SO OTHER UNIT ON THE MARKET HAS THIS FEATURE! THE STRIPPER'S intended use is to stabilize and restore crystal clear pic- tures to prerecorded video tapes for your plersonal viewing enjoyment. Electronic Rainbow doesn't recommend using The Stripper to duplicate perfect copies from rental tapes in your own home for your personal use. COMPLETELY BUILT $49.95 WARNING: Use of this device lo duplicate copyright material may be against certain federal & slate laws. ifkitiriflfk irk irirlrklrlritirkititititit'kif'trit "kitirkirlt THIS MANUAL CONTAINS ALL SCHEMATICS, PARTS & P.C. BOARD LAYOUTS FOR ALL OF THE RAINBOW KITS. USE YOUR OWN PARTS TO CONSTRUCT ANY OF OUR KITS, KIT BOOK $14-. 95 VOICE ACTIVATED swrrcif This vojt can be used lo operate a tape recorder, ham radio, CB radio. Use It to turn on an alarm. The output can operate a load up to IQOma. It will operate a relay, lights, motor, or LEDs. What could you do with a sound actlvlated switch? Siie1.5"xl-25" KIT VOX-1 $6.85 LIE DETECTOR This kit can be great fun at parties. Lie and an audible tone will change, the more you lie the more the tone changes. When you lie your palms A forehead sweat. This kit allows you to meas- ure these chances. Only a very slight amount of change will cause the tone to Increase in fre- quency. Operates on 6 to 12v DC. Sl2« KIT LD-T $9.95 $5.00 OFF IF YOU BUY ANY KIT. TV NOTCH FILTERS OUR TV FILTERS ELIMINATE UNWANTED TV CHANNELS OR ANY INTERFERENCE THAT ALTERS BOTH THE SOUND AND VIDEO. Channels available 2 thru 6 & 14 thru 22 Specify a specific channel when ordering f i O T E: k:\ TV n \w >;u i m . H4d ,w ttfuci, ioa ii purpoMi enlr. Vgu fliut, Bbtiln [M,*nl i- iKrfi 'rc.Ti rpuf hcejj cibU Mmwny bde.i L-i.r.j nil* IHItct on your eibla 11 il«nt. CHOICE 95 EACH 14 Please add sufficient postage W( *ill accept telephone orders tor Visa & Mtittrcjrn' To Order Call 317-291-7262 lELECTPonic pmnsoiuT] 6254 LaPas Trail • Indianapolis, IN 46268 CIRCLE 247 ON FREE INFORMATION CARD RE-SHOPPER 5 Add New Enjoyment To Your SW Receiver with the *MICRODEC™ Decoder MODE S«l»cts. CW, RTTV, ASCII POWER/ VOLUME CONTROL ALPHANUMERIC SX7 DOT MATRIX 8 SEGMENT LED DISPLAY $199 LIST PfilCE SJ29 95 SIGNAL STRENGTH INDICATOR LED SEVEN LEVELS OF INTENSITY BATTERY CHARGE LED MICRODEC™ decodes MORSE. RTTY, and ASCII to ALPHANUMERIC CHARACTERS ' Completely portable with optional NICAD rechargeable batteries mounted internally. — 529.95 [List S49.95) * LMra compact grxJ lightw&ight (1.5H X 5.G6W x 5.25L) * Optional display color: $15,00 (List $30.00) (red or yellow} * Operates on DC railages between 9 VDC and 15 VDC (AC/DC adapter provided at no cost). ■ Automatically tracks MORSE code speeds [rom S to 70 WPM • Decodes 60.67.75, 100 wpm RTTY and 110, 330 BAUD ASCII. • Standard ASCII port to interface with your computer. • Internal practice code oscillator. • Standard cockpit green display- (red & yellow optional) • Power swilch/VolLi me control/Internal speaker SHIPPING AND HANDLING; Continental United States add $3.50 for UPS ground. Florida residents add 6% sales lax. Other types of Express shipments and foreign destinations will be quoted on request. METHODS OF PAYMENT: MasterCard. VESA, Money Orders, Certified Checks, and Personal Checks. (Please allow two weeks for personal checks to clear ) QUANTITY DISCOUNT FOR HAM/SWL CLUBS. Dealer Inquiries Welcome. SOMERSET ELECTRONICS, INC. 1290 HIGHWAY A1A, SATELLITE BEACH, FL 32937 • ORDER & FAX: (407) 773-8097 ORDER YOUR CLASSIFIED SPACE FOR MARCH 1991 NOW— SEE ORDER FORM PAGE 68 DataCrcrft looking for "w^ DRAM 1MX1-70 1MX1-8Q 1MX1-100 41256-70 41256-80 41256-100 4425 6-80 4164-100 4464-100 S5 , 99 $5.59 55,49 $1.89 $1.79 $1.69 $5.89 $1.59 $1 SIMM/SIPP 1MX9-80 1MX9-100 256KX9-80 2 56KX9-100 $16 lMx8-80 4MX9-80 99 $55,0 $54.5 $16.5 $54.0 $339 Bargains? $s0ff$ Eprom Programmer 8031 , Z80, 6809 PC-based Programmer ■ Programs 27sor and 27xxx up to 27010. - Supports various Formats and voyages w/sottwara tfi-jcUob (T-J3C 1 * 10 &11.D 27512 !plj3 IHos Single Board Computer 8031. 81 55+2764 +RS232 Z-W. 2x82554-2764+6264 6fl0a 2*8255 +2764+6264 Safe board with schflmoftes 1 $18.5 486-25, 100MB, SVGA sy 386-33C, 100MB, SVGA 386-25C, 40MB, SVGA sy, 386-SX, 40MB.SVGA sy: 286-16, 40MB, SVGA syi $3190 $2350 $1850 $1390 $1150 N\ Systems Include; 1 W> memory. 5.25" 1 .2M Floppy Drive or 3-5" 1.44M Floppy Drive wttn controller . 101 Enhanced Keyboard. AT Desktop casa with Power supply, 2 Serial, 1 Parallel, 1 Game port. High quality Gold Star SVGA 1024)1763 14" Color Monitor. Prototype Cards for IBI*PC/XT«TjPS2 Universal plug-in from 4"x4" $12.5 m \OrderCall (800) 873-3709 M * All prices lie cask anly f Quantity pricing CAL * Add $3,5 minimia StH, snd Add S3. 5 Fat COD, * Adtt T.tSt Sales Tax on CA residents-. ' Honey 'Jrdtr, Pezaan&l Check, FQ mt-cpied. 282S lone Drive, San Jose, CA 95132 (408) 259-4866 Motorless Motion! Robotics! Engines! Inventions! Thin Shape Memory Alloy wires, contract like living muscle when electrically activated. Space Wings - Sleek silver wings flap silently using only 5 cm of SMA wire. Assemble this futuristic kit in under an hour. Stands 15 cm high. Perches on your PC or desk lamp. Annoys cats. With printed circuit board, parts, info on SMAs, and complete instructions. Runs on two A A batteries {not included). 3-001 Space Wings Kit $19.95 Send a business size Self-Addressed Stamped Envelope far latest catalog. Order Today - Send check or money order (sorry no credit cards). CA orders add 7.25% tax. All orders add $4 P&H ($8 to Canada). Mondo'tronics • 2476 Verna Ct. San Leandro, CA 94577 • USA REVOLUTIONARY LOGIC PROBE BECKTRON's TD-4, THE ONLY FOUR CHANNEL LOGIC PROBE THE TD-4 IS LIKE FOUR LOGIC PROBE IN ONE EACH CAN BE USED INDEPENDENTLY OR SYNCHRONOUSLY THE TD-4 IS A FOUR BIT TRIGGER SOURCE FOR YOUR OSCILLOSCOPE THE TD-4 FEATURES: "TECHNOLOGICALLY ADVANCED SIMPUSTY" 4 CHANNEL OF QUALIFIERS; RE-OCCURING DATA CAPTURE; ONE TIME EVENT DATA CAPTURE UP TO 15 NAN0-SEC0NDS; PROPAGATION DELAY COMPENSATION; TTL AND C-MOS COMPATABLE; SHIRTPOCKET PORTABLE; AFFORDABLE; 4 CHANNEL EVENT RELATIONSHIPTOUR BIT TRIGGERING EXTERNAL SOURCE FOR YOUR OSCILLOSCOPE AND MORE; BECKTRON H oning Th« Technical Edg* 56 BECKTRON's D*al*r* Iftqulrtt* W*leein* RE-SHOPPER TD-4 TD-4 PRICE $229.00 1-800-592-4141 J^?jy| Full line catalog available UJn'»> Terms; Visa / MC / COD CIRCLE 284 ON FREE INFORMATION CARD 2SD-313 II low K .1' 2SD-1398 HE.,-. 1.10 2SD-869 1.15 AN-7148 ng*B 1.10 BA-5406 .81 HA-1377 111 .96 LA-4445 hhh .95 TA-7270P 1.20 TDA-2005 as law s ,99 UPC-1366 STK-4191H a.60 <^^m K IQW Ji ,03 ©=® J KWr JS ,05 e km k .07 .21 as low as 1.49 as taw as 1.25 js»wat 1,90 .20 O 19.50 .51 OCT CD 3', 6'. 9'. 12', 25'. 50'. 75', 100' Large Selection of Rubber Belts 8.75 FOR MORE INFORMATION ABOUT OUR PRODUCTS AND PRICING PLEASE CALL FOR A FREE CATALOG Replacement Triplers FLYBACK REPLACEMENTS 10.57 9.06 9.28 7.98 EMERSON REPLACES MFR« I ORDEFW 1 1-4 04321 40OJ1 0432140071 0432140081 M32200111 62-810 62-825 62430 630122 GOLDSTAR REPLACES MFHI I ORDER! 154-040 154-040*. 154-040B 154-0*1 A IS4-056A 154-07** 154-074E 1S4-074N 154-122E 63-409 83410 83412 63411 63-415 63-450 63451 63-0102 63-460 16.47 22.16 16.60 31.72 1-4 HITACHI REPLACES MFRl] OgDjM 2432471 2432811 243?944 2433171 2434391 2-434401 2434651 7334021 63-0104 63-0105 62-840 6341118 62-850 62-860 63-0103 63-0101 17.58 17.30 19.3S 17.55 17.14 15.00 18.51 18.52 15.30 14 23.15 23.1 S 35.24 30.94 18.47 18,60 20.37 28.40 KAWASHO REPLACES MFRtl ORDEHt 1 01-21 *-0O* -03 101-214-005-03 101-214.009-03 101-22OO02-03 101-220-003-03 62-170 62-160 62-190 62-200 62-210 1-4 PANASONIC REPLACES MFB> | ORDER! TLF-6041F TLF-69965 TLF-14401F TLF-HSWF TLF-14617F UF- 14708 nr-tmm TLF-70012 TLF-808Q2-1 TLF-80843-1 62-485 62-510 62-570 62-580 62-490 62-601 62-520 82-740 62-530 62 MO 17.33 17.34 17.34 23.16 20.S7 1-4 SAMPO REPLACES MFHJI ORDER4 BFT-0240 BFT-043B 8FT-046 8FT063A F8-1053 FB-1061A FB-3005 FB-01166 63-860 83-900 63-S7C 63-890 63-210 630109 6341110 6343121 28.28 K.37 20.76 22.16 27.27 27.18 28.97 18.60 9.42 9.42 1-4 8.06 9.01 8.06 8.06 1B.27 19.42 21.62 29.76 SAMSUNG REPLACES MfR< I. OBOER* I 1-1 FBC-1215AL FCM2015BL FMD-1235BL 62-850 62-680 62-760 12.24 18.47 12.24 SANYO Pt ACFS MFR* ORDER* 4-2751-48500 63-105 4-275148600 83-110 4-2751-60106 63-115 F0-1S2A 63-135 FO-239 83-150 FO-240 63-155 FO-241 63-160 FO-243 63-170 FO-260 63-180 F-1108 63-220 F-1117 63-225 F-1110 63-240 F-1123 63-250 f-1125 63-252 F-1129 63-255 F-1133 63-260 F-1148 83-270 F-1177 63-280 8.00 8.00 7.59 15.70 15.71 17,10 15.57 19.66 15.94 18.74 25.88 17.15 15.55 15,91 25.85 21 .51 20.88 19.45 A.O.C. REPLACES MFRt l QHDER4 I 14 "" I22.ee 79A 302-1 S3 0107 SHARP RfPIACFSMFRf OJV?_En«. RTRNF CO03PE75 RTRNF 0009PEZZ RTRNF 0014 RTRNF 0015 RTRNF 0016 RTRNF 0069 RTRNF 1335CE RTRNF 1431CEZZ RTRNF 1-4S2CEZ7 HTRNP 1477CE22 RTRNF 158BC 83410 63-620 63-630 63-840 63450 83460 63-1335 834110 63-920 63-930 630106 14 SONY REPLACES MFRl I CRDER* 1439-238-11 1-438-254-13 1-430-273-12 1-439-351-22 1-439-351-13 1-439-357-12 22.50 22.B6 20.50 20.50 20.50 20.50 34.22 24.93 24.93 24.93 25.00 14 630111 634)112 63-0113 63-0115 834)119 834)120 21.17 17.64 21.17 22 05 29.58 29.58 TANTUNG REPLACE3 MFRl I OBOEB* 1 f ia 174 63-0117 121.62 R.C.A. R EPLAC ES MFR* | P ROEM IW58T 1-4 634)108 I 20.88 FOR FIVE OR MORE PIECES. PLEASE CALL OUR TOLL FREE NUMBER What you see here is not only what you gat. WE STOCK... over 13,000 different items, act now, start the saving. Call us or FAX us, for your free large catalog, we will mail it to you right away. Or Fax us your Inquiry. (213) 727-5032 OR (213) 88fr6032 SERVICE: SHIPPING: A SUMMARY OF WHAT WE HANDLE SEMI-CONDUCTORS 74 3SK BUX LB MPS TD 74HC AC BUY LC MPSA TBA 74 LS AD CA LD NE TOA 1N AN CX LM SN TDA 2N BA DM M STA TIP 2SA 8C GL MB STK UA 2SB BD HA MC STB ULN 2SC BF HD MJ SN UPA 2SD BU KA MJE TA UPC 2SK BUW LA MN TC UPD i\ look us decades in this business to We $hip anywh«n n ifc wortd within have 16. 000 customers. 24 hours from ihe date of your Aggressiveness to »m you ihe conJirnraimn We can use customer We do ail we can to help you • Airmail save and grow. • OHL * Airlines • or other means of trwsaoit Min. Order $49.00 PRICES: Our competitive prices Have moved us lo the front of the line In this industry We have tow, low price* because we arc convinced to mark up every item we have the lowest % we can afford QUALITY: We sell premium high quality merchandise. (I it was nut that puod we would not buy it ourselves, and we offer alitlutlgn gunrinleed. All prices, terms, and conditions subject to change without any notice Genuine made semi-conductor I.C. sockets Fuses & lamps Connectors audio/video Cable assemblies audio/video Magnetic tape heads DC motor 6, 9, 12 volts Rubber belts audio/video Pinch rollers audio/video Video idler assemblies, wheels & tires Video heads & belt kits CATV/MATV accessories Ties & clips Indoor TV antenna Video R.F. modulator High voltage triplers 1-800-325-2264 DALBANI CORPORATION OF AMERICA Address: 2733 CARRIER AVENUE LOS ANGELES, CALIFORNIA 90040 UNITED STATES OF AMERICA Tel: (213) 727-0054 Fax: (213) 727-6032 (213) 863-6032 CIRCLE 260 ON FREE INFORMATION CARD ALL SALES IN U.S. DOLLARS WE ACCEPT VISAJ M.CJAm.E*. RE-SHOPPER E Double yrour income! Computer maintenance/service - a $10 billion industry* If you are presently servicing TVs, VCRs, camcorders or any other electronic equipment, computer repair can double your income. National research results indicate that computer technicians bill out at double the hourly rate of electronic equipment technicians. Tech-Serv can put you into computer repair quickly, economically and efficiently and with a complete support program including a proven marketing plan. We provide: RECOGNITION Nationally recognized trademarks and logos give you immediate recognition as a professional computer repair specialist by being a Tech-Serv Aulhorizecl Computer Repair Center in your market area. DOCUMENTATION We provide manuals, schematics, documen- tation and advanced diagnostic software. NEW HARDWARE CPU's: IBM, Apple, Compaq, and others. Printers: Okidota, Epson, HP Lasers and others at huge discounts. PARTS & BOARD REPAIR Single source for parts and board repair. 24-nour express turnaround. TRAINING Hands on training: IBM, Compaq, Apple, and compatibles at 3 separate levels: Level I: 8086-8088 Based Machines DOS System Configuration and upgrades Level 2: 80286/80386 Machines, Letter Quality and Laser Printers Level 3: System Networks Configuration, Installation and Repair FINANCING Available for qualified businesses. OVER 165 DEALERS WORLDWIDE Find out why more and more electronic professionals ore adding computer repair to their businesses or starting their own com- puter repair businesses. Call Tech-Serv at (212)967-1 865 now. ^•Qf^h auTmOHiZEDDEalEH SERVICING THE WORLD OFWICROS (HHtTdviwCp. 253 West 28th Street, New York, NY 10001 LEARN ELECTRONICS FROM VHS VIDEO TAPES1 CICfiNDO = [Success Our Video Tapes Are Designed Make Learning Electronics Fun and Easy! • PARTI-DC, 53 min Electronics and You — VT-20I .532.95 • PART 2-AC, 71 min S32.95 Electronics and You— VT-202 • PART 3-SEMICONDUCrORS, 47 min $32.95 Electronics and You — VT-20S • PART 4-POWER SUPPLY 55 min $32.95 Electronics and You— VT-206 • PART 5-AMPLLFIERS 52 min ....$32.95 Electronics and You— VT-207 • PART 6-OSCILLATORS 54 min $32.95 Electronics and You— VT-208 • VCR MAINTENANCE & REPAIR VT-203-54 rain $32.95 • INTRODUCTION TO VCR REPAIR VT-204— 1 10 Min $59.95 CALL TOLL FREE AT 1-800-678-6113 f^ Jrt*flCA* P mail check or money order to: MA§ * r pTEP UCANDO VIDEOS hC * P.O. BOX 928 • GREENVILLE, OH 45331 CIRCLE 29 ON FREE INFORMATION CARD formers for power con- version and transmission applications.. The instrument accu- rately determines and dis- plays the turns-count of toroid transformer core windings, even if they are overlaid with hundreds of turns wrapped with finish- ing tape. By eliminating the need for benchtop setups of signal generators, os- cilloscopes, and volt- meters, use of the 3500A reduces the chance for human error and level of skill required to do that type of testing. Toroids are placed over the instrument's conical mounting hub and, at the touch of a button, a rotating contact arm swings into position to complete the low-voltage primary con- nection. In 100 ms or less, the test is performed and the results are displayed: total test time is just 15 seconds. A low- per- meability mode, in which the unit is used to compare toroids under test to known turns-count refer- ence transformers, solves the testing problems caused by low-permeability core materials. A wide se- lection of reference toroids for testing purposes are available separately. The model 3500A toroid- transformer tester costs $1995.00; reference toroids cost $50.00 each — Atlantic Mag- netics, Inc., 1441 SW 30th Avenue, Pompano Beach, FL 33069: Tel; 305-979-7920; Fax: 305-977-5128. R-E 58 RE-SHOPPER CIRCLE 285 ON FREE INFORMATION CARD TEST INSTRUMENTS MODEL P-2020 20 MHz DUAL TRACE WITH COMPONENT TESTER. $339 CURSOR READOUT P-2620 20 MHz, DUAL TRACE $699.95 P-2640 40 MHz. DUAL TRACE S839.95 DIGITAL STORAGE SCOPES P-2820 20MHZ, 20 MS/S S1299.9S P-2840 40 MHz, 20 MS/S $1499.95 "All Scopes Come Complete With Probes. Spec Sheets - Upon Request. OTHER MODELS P-2520 20 MHz, DUAL TRACE, DELAYED TRIGGER $439.95 P-2540 40 MHz, DUAL TRACE. DUAL TIME BASE $689.00 P-2560 60 MHz. 3 CHANNEL, 8 TRACE $899.96 P-2035 35 MHz-50 MHz. DUAL TRACE. DELAYED TRIGGER $449.95 P-2015 15 MHz, BATTERY PORTABLE, MINI-SCOPE $499.95 P-2510 100 MHz, 3 CHANNEL, 8 TRACE $1250.00 Auto-Ranging "Probe" and "Shirt Pocket" DMMs MODEL D-935 $29.95 • Model D-935 includes 2 probe tips (short & long; 2-Lr-44 button battery) carrying case, ground lead & alligator clip. • Size / Wt.: 1-1/8" H x 7/8" W x 6-1/3"D; 2.1 oz. • Has audible continuity beeper data hold. Input 10MCI • DCV: 0.1 mV to 1000V ±0.7% (±1% D-930) 5 ranges. • ACV: 1 mV to 500V +1% 4 ranges. • Resistance: 0.1 It to 20M tl ±0.7% (+2% D-930) 6 ranges. • Model D-930 has diode test and includes batteries, probes, carrying case. • Model D-930 Size / Wt.: 2" W x 4-1/3" H x 2/5" D; 3-1/4 oz — j — MODEL D-930 $19.95 Bar-Graph DMM • Auto-ranging for easy accurate readings with manual over- ride. • Range and data hold, plus Hi-low power ohms. • Memory set, for making relative meas. • Transistor test for NPN / PNP plus diode lest. • Analog bar-graph ideal tor null- peak and trend observation. • Extended resolution of 1:3000 in manual mode. • Visual plus audible over range indication for voltage and current. MODEL D-990 $69.95 200 kHz AUDIO OSCILLATOR and DIGITAL FREQUENCY COUNTER B-820 $225 SWEEP FUNCTION GENERATORS B-801 (2MHz) , ^HL-~ T Jl $230 B-810 (10 MHz) $895 FOUR FUNCTION FREQUENCY COUNTERS Frequency, Period Totalize, Self Check w/ High Stabilized Crystal Oven Oscillator, 8 digit LED display. B-318 (1.2 GHz) $199.95 B-808 (120 MHz) / $175 DIGITAL MULTIMETER 19 Ranges DCV-1000 ACV-750 DCA-10A Res-2MB Diode check DIGITAL LCR METER Measures: Coils 1uH-2O0H Caps .1pf-200uf Res J01-20M ZM-108D $99.95 2KV and 20KV MULTIMETERS A-402Z (20KV) $17.95 A-413 (2KV) OMNITRON ELECTRONICS 280 No. Midland Ave. (Bldg. Z-2A) Saddle Brook, NJ 07662 $6.95 (MIN. 10 PCS.) 201-703-9800 Fax: 201-703-9804 96 PAGE CATALOG (FREE WITH ORDER] $3.00 Value 10 FUNCTION DMM WITH TEMPERATURE PROBE •10 Functions •Temp, with "K" type thermo. probe - 20°C to 1200°C. • Frequency: 10 Hz to 200 kHz, 2 ranges. •Capacitance: 1 pf to 20 uF, 3 ranges. •Transistors: hFE, NPN/PNP •Diode and continuity test, data hold •20 ampere AC/DC D-910 $99.50 UPS Shipping. Continental USA 5% Money Orders, Certified Checks School Purchase Orders — Net 30 Sorry... No COD's. Add 5% For Credit Cards Visa • Mastercard RE-SHOPPER 5 LAB-ON-A-CARD ™ (For your IBM PC or compalable) Imagine having all of the following instumants for one tow pries: 4 CHANNEL DIGITAL STORAGE SCOPE 40QK samples/sec (adjustable) flexible trigger modes: pre. post, voltage, time mutti (tike logic anatyzer!) 3 CHANNEL UNIVERSAL COUNTER/TIMER time nanoseconds to days frequency to 1 MH2 PULSE GENERATOR nanoseconds to days mono or astabte DIGrTAL VOLTMETER use alone or add PK, PK-PK, or ?? to your scope display 24 CHANNEL DIGITAL I/O Use as trigger inputs for instruments or general purpose TTL VO Manual shows you how to modify the instrument software (SOURCE CODE included} or write your own routines in any language. Examples include: LOGIC ANALYZER, how to add cursors to your scope, make a CHART RECORDER and MORE! Most instruments operate concurrently. Introductory specials: KfT: Assembled $295.00 $349.00 Seaside Software 312 W. Sixth St. #106 R1 Corona, CA 91720 (714) 278-3780 VISA / MasterCard CA residents add 6.75% tax BACK-UP ALARM • Prevents possible backing accidents • Detects unseen objects behind a vehicle • Gives out a warning signal to the driver • Eliminates the guesswork when parking in reverse • Never again will heavy rain, snow, or fog be a problem • Easy installation onto the bumper • Available in black, silver, chrome, red. ivory to match the color of your bumper • 30 day satisfaction guarantee; Full refund if not satisfied $49.99 + J2 SO shipping & Handling Send check or money order to: Calco International 1 8040 Sherman Way Suite 51 1 Reseda. CA 91335 Tel: (818) 708-2334 Fax: (818) 708-2362 THE COMPUTER VIRUS HANDBOOK; by Richard B. Levin. Osborne McGraw-Hill, 2600 Tenth Street, Berkeley, CA 94710; softcover, $24.95. How can you protect your company computer data from viruses? Cutting through the hype, rumors, and false claims about computer viruses that plague the marketplace, this book is a practical and useful guide to minimizing the risk of corrupted or lost data. The author presents an overview of how viruses and other types of "rogue" software operate, and then ptesents tips on preventing the spread of computer vir- uses. Complete coverage of antiviral policies for the workplace includes advice on evaluating and using antivirus software, identify- ing and eradicating viral in- fections, implementing vir- al defense mechanisms, hard-disk management techniques, and personnel policies. CIRCLE 30 ON FREE INFORMATION CARD Eight file-protection util- ity programs are dis- cussed, and complete step-by-step instructions are provided, for FATSO (File Allocation Table Se- curity Option); PARK Chard- disk head parker); Vir- uscan (command-line virus scanner); Protect (soft- ware write-protect tab); Lockup (automated hard- disk lock and key); FLU SHOT + (memory-resident virus protection); Clean-up (virus-eradication utility); and CHECKUP (the au- S olid -State Laser ■TV' lmW Solid-State Laser. Uses Toshiba 9200 laser diode. Produces about a 0.6' spot at 40 feet. Requires only 3.9 to 4.5 VDC C3 pen-light batteries works great.) Wavelength; 670nm (red) Sizes Only 1.6' long by 0.625' in diameter! $130.00 each!!! Laser Diodea Toshiba TDLD92Q0 Wavelength: 670nm Optical Powers 3mW Operating Current; 85nA $65.00 each Toshiba TDLD9211 Wavelength: 670nm Optical Powen 5nW Operating Current; $110.00 60nA each Laser Diode Collimator Fits all Toshiba laser diodes. Used to maintain a tight beam at long distances, High Quality Dptic. $18.00 each Midwest Laser Products P.O. Box 2187 Bridgeview, IL 60455 (708) 403-6984 Call or write for free catalog. Low Power He-Ne's Holography Lightshows Optics Shipping 1 Handling Under J50.00 =*5-00 S50.00 to $100 =$7,00 over SIOO -S1Q.QQ 60 RE-SHOPPER CIRCLE 296 ON FREE INFORMATION CARD MS-DOS EPROM PROGRAMMING SYSTEM NEEDS NO INTERNAL CARD EEEEQMS 2804, 281 6 A 2B64A, 28256* Microcontrollers 8741 A*. 8742* 8748*. 8748H* 8749", 8749H* 8751*,87C51* 8752*. 8744H* "Socket Adapter Required (Diagrams Included) CONNECTS TO YOUR SYSTEM'S ~ PARALLEL PRINTER INTERFACE -A FULL FEATURED, EASY-TO-USE SYSTEM WORKS VflTH ANY DESKTOP OR LAPTOP MACHINE * ADAPTIVE, HIGH-SPEED ALGORITHM MINIMIZES PROGRAMMING TIME AND INSURES VAUD DATA - SYSTEM PROGRAMS ALL STANDARD DEVICES OR EQUIVALENTS FROM ANY MANUFACTURER * ALL SYSTEM COMPON ENTS FIT NEATLY INTO CASE FOR TRAVEL OR STORAGE SYSTEM SOFTWARE COMMANDS EPROMS 2708 (3 supply) ^^^^^— ^^^^» 2758,2716 ^H ^H 27C16, 2S16 2532*, 2564* ^H 68764*, 68766* ^H 2732, 2732 A w| 27C32, 2764 r ^^^ 2764A, 27C64 Li U ' -1 27128, 27128A 27C 128, 27256 *■' •.**::•; 1 27 C256, 27512 27C512.27C010' 2701 0*,27C1 001* Bj -r^-T PROGRAM EPROM(S) FROM DISK FILE READ DISK FILE INTO BUFFER READ EPROM(S) INTO BUFFER SAVE EPROM(S) OR BUFFER TO DlSK PROGRAM EPROM(S) FROM BUFFER COMPARE EPROM(S) WITH BUFFER • COPY EPROM(S) . VERIFY EPROM ERASED . BUFFER EDITOR • SELECT DEVICE TYPE . DEVICE CHECKSUM BUFFER EDITOR HAS 18 BYTE LEVEL COMMANDS FOR DETAILED OPERATIONS SYSTEM INCLUDES: PROGRAMMING UNIT, POWER PACK, CONNECTIN G CABLE, OPE RATION MANUAL ft SOFTWAR E SOFTWARE AVAILABLE ON 3 1/2" OR S V*" DISK $239 TO OSOEH SEND CHECK, MONEV ORDER, WHITE OR CALL: ANDRATECH P.O. BOX 222 MILFORD, OHIO 45150 (513)831-9708 CALL OR WHITE FOR MORE INFO. - ADD 55.00 FOR SHIPPING - WOO COD VISA MASTER CARD VOICE MAIL MONKY-M AKER Generata hundreds of dollars monthly in your spare time by install- ing a BigMouth voice mail card and our menu-driven software package in your own IBM-clone computer. \ Use it to rent voice mait- \ boxes and pocket pagers, advertise mail order products, or op- erate a pay-per-call service using credit cards, passwords, or a nationwide 900 number. Add the optional Goldmine module and your BigMouthvi\l\ automatically generate outbound tele- phone calls to friends, existing clients, or new prospects for sales and telemarketing purposes. Your BigMouth arrives complete with all software, external speaker, third-party peripherals directory, a detailed installa- tion manual and entrepreneurs guide. ID#1840 Bigmouth *299. H • ID#1841 Goldmine *99." Entrepreneurs Toolkit •25. e *< tTO iiB4mfiinii-:j J iird 1Me ») 24-Hr Info & Order Hotline 1*800-283-4759 DemoSource 1 8646 Corbin Avenue « NotthridRC, CA 91324 Choc*. * Ms ro^kfcm bofen u Hig oiunMt * Reseller Inquiries Invited J CIRCLE 281 ON FREE INFORMATION CARD R-E SHOPPER CLASSIFIED MISCELLANEOUS ELECTRONICS FOR SALE INTERESTED IN a better screwdriving bit? Phillips, Torx, Slolled, Tri-Wing, Square Tip, Allen and more? Then use Apex! An industrial bit that is precision machined from special shock-resistant steel, then heat treated for toughness and durability. The bit that sets the standard for "quality" in American in- dustry. A bit that is inexpensive without being cheap. Sound great? Then send today for your complimen- tary catalog. Pick from 101 sizes and styles in lengths up to 6 inches. You'll get low prices, speedy delivery and courteous service. Shipping is fiee, and no order is ever too small. Made in the USA. DON SHOCKEY COMPANY, P. O. Sox 24042-RE, Dayton, OH 45424. (513) 236-2983. TUBES RECEIVING INDUSTRIAL ANTIQUE 6L6GC 6LQ6 20LF6 12AX7 ETC. SYLVANIA DIS- TRIBUTOR EXTENSIVE INVENTORY ARLEN SUPPLY CO., 7409 WEST CHESTER PIKE, UP- PER DARBY, PA 19082. 1 (BOO) 458-1301. FAX (215) 352-9388. 3-1/2" HD 1-44MB formatted disks. USA made. 10 minimum. $1,00 each postpaid! 100% certified or huge catalog of over 3,000 surplus items on 720K disk $2.00 free with order! BEACH RADIO, PO Box S48, Boston, MA 02112-0548. CABINETS/ENCLOSURES. Rigid 1/16 aluminum shell, hardwood trim, contemporary styling. Several sizes and styles available. $9,99 - $23.99, free bro- chures. PYRAMID ELECTRONIC PRODUCTS, 15020 LaGrange Road, Suite 2100, Orland Park, IL 60462. TUBES $2.49, 1000 types. Afso surplus compo- nents. SASE brings lists. DNF, 6690 7 Mile Road, Soulh Lyon, Ml 48178. COMPUTER HARDWARE FREE CATALOG. Huge discounts on IBM compati- ble hardware. A&D PRODUCTS, 250E S. Lyon, Suite 322, Hemet; CA 92343. COMPUTER SOFTWARE PC BOARD and schematic design software for the IBM PC/compatible. Create professional PCB layouts (requires EGA) and electronics schematics (CGA) with these inexpensive shareware programs. Both lor $7,00. DEL-PHONE INDUSTRIES, PO Box 5835A, Spring Hill, FL 34606. FREE GAME or utility program for IBM on 360K disk! You choose category, we choose program. We will also send you our lists of rental and shareware programs and surplus electronics (over 3000 items) on nrtore disks! Monthly specials too! Just send $2.00 (refundable) for shipping. Add $ .50 for 72QK disks. BEACH RADIO, PO Box 548, Boston, MA 02112-0548. RELAY BOARD for PC/XT 32 inputs 16 DPDT relay outputs. Software matrix selects any input to any output. Board, cables, terminators, and software $299.00. MBF ASSOC. Box 6775, Torrance, CA 90504. RE NT C OMM E R C I A L software, as low as $2. 00 per disk. SOLUTIONS: Box 5143, Old Bridge. NJ 08857. PLANS-KITS-SCHEMATICS INFRARED REMOTE control tester. Build your own with easy to find parts. No more hard to see test cards, anyone can build it. Send $5.00 for plans or large SASE lor more information. CHECKMATE COMM., PO Box 11-0B0e. Brooklyn, NY 11211 DIGITAL COMPASS Sensor. Build your own state- of-the-art electronic compass with LED output. Sen- sor & plans $16.00. DEL-PHONE INDUSTRIES, Box 5S35A. Spring Hill, FL 34606. FM STEREO TRANSMITTER kit including PC board and components. Transmitter is tuneable from 88 - 108 MHz to transmit audio from your disc player, VCR. TV or any line level source to any FM radio throughout your home, yard, or car. Send $24.00 to WJD ELECTRONICS, RD#2. Box 80A, Middleburg, PA 17842-9571. HAM RADIO kits & assemblies for various OST & 73 construction articles. We also offer books and electronic components. For catalog, send legal size SASE w'45 cents postage or $1.00 lo A&A Engi- neering, 2521 W. LaPalma, #K, Anaheim, CA 92801. PLANS, KITS: Bugs, micro devices, animal re- pel I en I, Infrared viewers, shockers, shotgun mi- crophones, scramblers, alarms. Great deals! $3.00 to GWM RESEARCH, 2025 Reuter Road, Tim- onium, MP 21093. COLOR TV repairs made easy. Fastest color TV repairs anyone can do. 125 priceless secrets. $2.00 brings sample or send large SASE for more informa- tion. CHECKMATE COMMUNICATIONS, PO Box 11-0808, Brooklyn. NY 11211. CB-SCANNERS SECRET SCANNER FREQUENCIES! Directories list federal agencies, police, surveillance, bugging,' codes, channels, etc. Big tree catalog! CRB, Box 56-RE, Commack. NY 11725. RE-SHOPPER I CABLE TV DESCRAMBLERS &*j 1S3S8 OWSWRK GREAT ^ WHERE OTHERS HAYE FAILED FREE CATALOG CALL NOW! ! ! TOLL FREE 1-800-535-1843 (8-5 CST) 24 HOUR ANSWERING MACHINE AFTER HOURS !ITY to DECODERS FTB-3 SA-3 TB-3 SB-3 109 88 7R 69 NON-ADDRESSABLE CONVERTERS STARGATE 75 JERROLD550 JERROLD 400 82 COMBINATION CONVERTER DESCRAMBLERS (BUftJ IN S8-3) JERROLDDRX L CALL JERROLD DRZ CALL CALL CALL CAL1 ALSO AVAILABLE: SACREMENTO SPECIALS, OAK, EAGLE, HAMLINE, TEXSCAN, REMOTE CONTROLS EXTENDED WARRANTY AVAILABLE CNC CONCEPTS INC. P.O. BOX 34503 - MPLS., MN 55434 MDAYSUAHANTEE SORRY, NO MINNESOTA SALES DISCLAIMER: It is nol Ids Intent of CNC Concept to dstraud any cable television operator Federal and State laws provide substantial penalties for I he iheli ol cable television services. POLICE RADAR SPEED MEASURING EQUIPMENT KUSTOM TR6 X-Band RADAR Professional models, some originally selling for $2000+. Portable 2-piece unit can be mounted on dashboard & connects to a 1 2. volt power source. Numerous uses: car, boat & snowmobile racing, baseball, speedometer calibration, traffic surveys, etc. A wide selection of used and reconditioned X- band and Kband models with 90-day warranty start at only $1 99. Lower priced asis units for experimental use. Limited quantities. Call for free catalog and list. BOOKLET Wow RADAR Works' ONiyt4.95ppd.^ DECATUR MV-724 K-Bcmd RADAR UHF EQUIPMENT CLOSEOUTS Zenith SSAVI STV-2-*75 fori, $49 ea. for 12. Blonder Tongue - $21 for 1, $14 ea. for 12. (UHF units untested, as removed from service. ) Bargains on UHF antennas, RGll/U cable, etc. ■D AIS Satellite, Inc. cUS 1% N - 7th Street t^/ Perkasie, PA 18944. Technical information: (215) 453-1400 Orders and catalog requests: 1-800-AIS-2001 Please call weekdays 10A.M. to 6P.M. Eastern time. R-E SHOPPER CLASSIFIED CB DX 1990'S. Get more out of your radio. CBR, Box 212 Rocheiie Park. N J 07662. Catalog. CABLE TV TEST EQUIPMENT ORDER YOUR CLASSIFIED SPACE FOR MARCH 1991 NOW— SEE ORDER FORM PAGE 68 DESCRAMBLERS, ELECTRONIC, test and com- puter equipment. Catalog $3.00. Refundable. BAR ENTERPRISE, PO Box 662, Portage, Mi 4&081. DESCRAMBLER SPECIALS All brands. Exam- ples: Combo Jerrold 400 and SB3 $165.00. Com- plete cable descrambler kit $39.00. Complete satellite descrambler kit $45.00. Free catalog. HJMRS INDUSTRY, Box 531, Bronx, NY 10461-0208. STARCOM 6 turn on. Boards $99.00. Tocom test chips 5503 A or VIP $39.95 guaranteed. Fully func- tional units Starcom 6 $275.00, Tocom 5501 $115.00, 5503 VIP $275.00, 5507 $350.00. BOND ENGINEERING, 3567B Grand #130, Gumee. IL 60031. IF YOU want some of the prices on converters, descramblers, remotes call B&S SALES (313) 365-0908. Example — Jerrold DRX-3-DIC SB built in for one— $11 0.00 delivered. Quantity prices avail- able. LOWEST PRICES. Test equipment and parts. Free catalog- EF ELECTRONICS, Box 326, Aurora, IL 60507. TEST EQUIPMENT by HP, TEK, etc., parts, tubes, accessories. Catalog $2.00 refunded with 1st order. R4D ASSOCIATES, 514 West Avenue, N.Augusta, SC 29841. (803)278-0744. DISTORTION METER LDM-171 Leader $550.00. WOW/FLUTTER meter LFM-3610 Leader $450.00. Never used. Box 588, Woodacre, CA 94973. BUSINESS OPPORTUNITIES EARN SSSS WITH YOUR COMPUTER AT HOME Exciting new part-time opportunities working with an established software marketing company Will teach. For info send $1 .00 to: COMPUTER, PO Box 1442-RE, Orangepark, FL 32067. 62 RE-SHOPPER Cable TV Descrambler Article Parts We stock the exact Parts for several articles published in Radio-Electronics magazine on building your own Cable TV Descrambler. February 1984 SB-3 Type 701 Parts Pkg $19.00 Includes all original parts. 702 PC Board 7.95 Original 3X4 etched, drilled and Silk-Screen pc board. 704 AC Adaptor.....7.95 12 to 18 Volt DC @ 200ma. 701, 702 & 704 29.00 All three for special saving. February 1987 Tri-Mode 301 Parts Pkg 29.00 Includes all original parts. 302 PC Board 7.95 Original 5X8 etched, drilled and Silk-Screen pc board. 304 AC Adaptor 7.95 12 to 18 Volt DC @ 200ma. 301, 302 & 304 39.00 All three for special savings. Tri-Mode Tutorial. .7. 95 26 pages of in-depth info. May 1990 Universal 901 Parts Pkg $49.00 Includes all 902 PC Board 9.95 Improved 4X7 etched, drilled and Silk-Screened pc board. 904 AC Adaptor 8.95 12 to 18 Volts AC @ 350ma. 901, 902 & 904 59.00 All three for special savings. Snooper Stopper.. .$39. 00 Prevent Descrambler detection with snooper stopper/data blocker and protect your privacy. Includes free article on Cable Snooping. Macrovision Kit.. .$29.00 Macrovision now you see it, now you don't with our macro-scrubber kit. Originally Published in Radio-Electronics . Signal Eliminator (tunable notch filters)......... .$29.95 Model number & channel; #23 (channel 2 & 3) #46FM (channel 4 to 6 & FM) #713 (channel 7 to 13) #1417 (channel 14 to 17) #1822 (channel 18 to 22) 1 remote replaces 3... The MAC 20 wireless remotes replaces any three combinations; TV, VCR, Cable Converter, Stereo, CD or other entertainment system. MAC 20 $59.95 A VCR in every room.. with the first FCC approved wireless home broadcast system. 120 ft. range. VC2000 $99.95 70 Channel Cable TV Converter $89.95 * 6 Function Infra-Red remote. * Fine Tuning. * Memory & Recall. * Compatible with all External Des cram biers. * Channel 3 or 4 switchable output. * STD, HRC & IRC compatible. CALL TOLL FREE 1-800-332-3557 Outside USA Call 1-508-699-6935 Visa, MasterCard and COD. Add $4.00 S&H, $6.50 Outside USA. D & D Electronics, Inc. PO Box 3310, VISA MC N. Attleboro, Ma. 02761 CIRCLE 267 ON FREE INFORMATION CARD RE-SHOPPER 4imimg| TERMINALS CI WWUFMTUREO Br RCA $85 RCA's APT is o high quality/ self-contained computer, a smart terminal, loaded with many features. Originally selling for about $500, this terminal is a super value for any/one needing a computer to access bulletin boards, word process or simply free ujp a larger PC * Built-in dual speed telephone modem with RJ*1 1 port for easy hookup. * Composite video or RF (channel* 344) allow use of either a monochrome or TV type monitor* * Parallel printer port for connection of o Centronics type printer. * Serial [DB-25] RS-232 port allows connection of TNC, herd drive, modem or other peripheral. ■ Keyboard selectable 40 or BO colum display, ■ Built in word processor with word wrap feature. * All terminal parameters are fully adjustable allowing emulation of many terminal systems. * Also includes acoustical coupler input, auto log-on, S customizable function keys plus morel Our APT's are very clean units removed From service. Instruction manual, wall cube power supply and TV/ APT selector switch included. Optional 6 1 Centronics printer cable- 5-25, Add $5 for UPS. IRO N PC tWDER TOROID CORES CM! 0. D. DOtwil 1-10 ll-w (ME 0.0. Mm Ml TI-W emi 0,1. 104) Ins 1-10 1141 IS-l OST 11 35 !5 144.! W S! TO id ns?4 nr 115 115 ITS nn m 41 35 39 T44-1 .440 - 41 .'! U TJ»! IK 119 4.09 ;. it TIM Iff 1! 35 39 !»! W tt * a T!0M IK in 475 'IS mu .IB IS 40 .35 ISM SMT 49 X it TM0-S! IB- 490 JK IM 11HI or 150 * » T»I7 SW tl .40 !( T!!5!« US" 115 in !M ns-i JSS 11 n 35 1»?il jotr 411 .» 11 TSM UF m in 540 TIM !ir n n .35 1505! 500- 350 X it T3C0-J 304" IK in 5.40 ras-17 isr 1! « .35 Til; .tw 57 X 11 IKJSS 3.04- 77! 13.U 17. ran XT 13 .40 .3! till iW 47 n a tJM-Sl 3 Or tse in I.JO 1*4 xr Si 40 .95 iusi m 4H X if T4M! 4 CUT IN 1300 11 raw xr li 40 .35 nu US' 5! .45 1! mn *otr 3H 1103 29 1305} w 7) .40 J! rat Jlf 45 15 17 I4DO-5! 400" 1400 l!« 11 T37-I jir 40 U JO mil us* •m IS 7! 1SM-! itt no !I00 21 m* »r 39 to SO tlJO-0 i sr 15 m 141 1JM7 ur IS u .50 ;■■■:.- ! nr 149 3M MS T«H cortf or* 9tti h mti\ rook fr*q*4*Ky projects ta« it of Aunt rtkilfvi nid die. iMt/SEfl Wltrt or« m4c wTtb ■ cor* k rln mterfrreiKt's froqociKr roaoj*. Tin urffl* of twh ton ((f). -2 tr -4] UkitH iIk nit. 2 mix - Max.mum Q ranqo .2510 MHz Permfjabirity i'iioJ- 1 RF IraniFofmer below ' oOmtflers ir «« . Meximvm renga 2- 30 MHi. Permeability (n*)- 8.5. Rf (rawfofmw »o 10 meflert. \ 7 mix — Maximum Q ronau 20- 200 MHz. P« rwabilify jua]-4.0. P.F kanifomflf HF VHF 26 mix - Maximum range DC- 8 MHz (VmaaMily (pcJ-75 DC, 60 Hi ond EMI/RFI (.lie. ««■ 52* ix - Maximum Q range DC- 1 MHi. P«r msabitlly {us) .7 J DC, 60 Hi and EfVJ/BFI 1,1m "0. Hat Tof&di c pcrrj!0 01 A Po 1 00 nn*el rh* Haled Freq ufrnty tang* w.lfl reduced O and ell«c»T>cy "Where the hard t. o find pa Catalog 6 included with your order |J3 a'lo carte). 200 pages, over 1 0,000 electronic PARTS includ- ing almosT any capacitor (Ira nsniiltingtomonolylhic| r fe5ijtor,indi>clar,wireorcable,ForaidAferrFfs r Collins replacement part, anienna, connector jrF, computer, IC, eleclricol), ihoFf, coupling, knob, motor, Fronsislor. diode, IC, switch, relay (solid sFole lo conloctors| f projeel box, rubber Feel, hard- wore (sloinless, brass, elc.|, tubing, (an or blower, tube (receiving to transmuting] or lube socket. Pleose odd adequate shipping [S3 min|. We accept Vise, MC, Amexco, checks', COD odd S3. 1315 Jones St. - Omaha, Nebraska 68102 • 402-34i-475O • Fax-. 346-2939 Surplus Sales of Nebraska ZENITH TERMINAL-$50 FEATURES: MODEL ZTX-l-UZ AND ZTX-1 1-Z: *Full size keyboard with help and function keys *New and complete in original box with user's manual *Built-in 300 baud auto answer modem *Two phone jacks: in from line, out to phone ♦Parallel Centronics printer port * Composite video output ♦Switch for use with single or multi line phones *CMOS RAM stores phone #'s and configuration info ♦Stores 26 phone numbers and names for voice, data, and auto logon dialing sequences ♦User changeable security access code *DEC VT52 and ASCII terminal emulation ♦Intel 8031 CPU ♦TIL serial port access through power connector MODEL ZTX-1 1-Z ALSO HAS: ♦RS-232 port for access to external modems ♦Technical manual with schematic circuit board x-ray views, semiconductor identifications USES: ♦Multiuser computer system terminal ♦Packet radio transmitter/receiver ♦Remote database access ♦Dedicated auto receive terminal MODEL ZTX-1 1-Z (WITH RS-232) $75 MODEL ZTX-I-UZ (W/O RS-232) $50 800 441-1491 COMPUTER BUSINESS MART 6450 Lusk Blvd. Suite E-102, San Diego, Ca 92121 (619) 453-8445 FAX (619) 558-3088 CIRCLE 286 ON FREE INFORMATION CARD R-E SHOPPER CLASSIFIED SECURITY SURVEILLANCE COUNTERSURVEILLANCE electronic equipment catalog transmitters, bug de- tectors, phone and fax scramblers, radar jamming equipment, spy books. $10.00, EDE, PO Box 337, Buffalo, NY 14226. TELEPHONE CALLER ID unit displays phone number of person calling, also stores numbers, dale and time of per- sons that phoned you while you were away. $89.95 EDE, POB337, Buffalo, NY 14226. (716)691-3476. REPAIRS-SERVICES ATTENTION ELECTRONIC COMPANIES! I! you are looking for homeworkers to do the ASSEM- BLING/SOLDERING of circuit boards for you, please send us details about your soldering needs. KASPEHSKI, POB 385, APO, NY 09098. COMPONENTS FREE PARTS and free disk! We've got electronic parts coming out of our ears and want to ship them to your pockets. One dozen assorted electronic parts pi us II st of 5000 + inventoryon720Kdisl<[reel Just send $3.00 (refundable) for shipping. BEACH RADIO PO Box 548, Boston, MA 02112-0548. ANTIQUE ELECTRONICS SUBLIMINAL. SUGGESTION audio tapes. Make your own and save $$$. For simple complete in- structions send $11,50 money order to ANDREW COUP, 359 9th Avenue, Lot #12, Tiffin, OH 44883. AUDIO-VIDEO-LASERS AFFORDABLE LASERS, we carry up to 3mw he- ne's, laser diodes, light show units, and holography kits. We offer the lowest prices. Free catalog. MID- WEST LASER PRODUCTS, PO Box 2187, Bridgeview, IL 60115. Phone: (708) 403-6984. PUBLICATIONS TECHNO JUNKIES join your colleagues! A new generation Information exchange newsletter. Short- cuts, covert, classified, more! Subscribe now! One year only $6.95 money back guarantee, or write for more info. MST, 6A Grove Street, PO Box 9105, #289, Norwell, MA 02061. BUY BONDS 64 RE-SHOPPER New Products Alpha Products proudly announces two new product lines: c Not serial communications devices, and Alpha Box interfaces. These new products are not merely A-Bus accessories, but complete sets of products for all of your interfacing needs. All the products are used to connect different types of devices to your computer. Our communications devices help you connect devices that have computer interfaces already built in. C-Net provides the option of connecting many different RS-232 devices to a single serial port on your computer. We also cany converters to other standards, including RS-422, RS-485 and IEEE-488. * C-Net Adapter. Connects the master control computer to C-Net. $74 * Quad C-Net Module: Connect 4 RS-232 serial devices to C-Net. Each device is configurable (baud rate, parity, etc.) and has 4.8K byte input and output buffers. $695 * C-Net Device Module: Connect any RS- 232 Device to C-Net tor data collection or communication, with handshaking. $195 Alpha Boxes and A- Bus cards both provide ways to interface other types of devices to your computer. Alpha Boxes sense, measure, switch and govern. They feature: * Each box is an attractively packaged self contained module that connects directly to the computer and includes power supply. ' The input boxes offer the option of logging data "off-line" and downloading it rapidly to the computer. * Built-in intelligence provides a simple and consistent interface to your software. A Sampling of Alpha Box Products: ■ Digital input: S4 TTL/CMOS/0.5V input channels. $495 * Digital Output: 64 TTl_/CMOS/0,5V level outputs. $495. 1 20V AC control available. * Digital I/O: 32 TTL Level (0.5V) Inputs and 32 Outputs. $495 " Analog Input: 16 channels. 0-5. 1V. 20mV steps (8 bit). 2000 readings/sec. $495. Expansion Option: 16 more channels. $100 * 12 Bit Analog input: 16 channels, programmable gain. 1 0000 inputs/sec. max. $995. option; 16 more inputs. $200 * Analog Output: 4 channel. 12 bit D/A. +5.1V outputs. $495. Expander Option: 12 more outputs. $200 ' Counter: 16 Inputs, 24 bit. $595 "We can make your PC do things you wouldn't believe." C 3 From Your PC ■ Command • Control • Communications Bring new dimensions to your computer with A-Bus. C-Net and Alpha Boxes. No longer is your computer limited to number crunching or word processing. Now you can connect to all types of equipment, sensors or machines. This offers unprecedented power from pro- duction lines to experiments to home control. Each product is designed to fit your needs: They're affordable. Compare our prices: the cost of a solution is surprisingly low. They're simple and easy to connect to your computer and your application, and carefully designed to adapt to your software easily. They're versatile. An infinite number of combinations is possible: one of them is right for you. Easily expanded or changed for future projects. They're proven by customers around the world, including Fortune 100 companies, universities, governments and individuals. Call for a Catalog (800) 221-0916 Overseas distributors Asia: Batam DA. Singapore Tel : 473-451 8 Fax: 479-6496 Japan: Japan Crescent Tel: 03-824-7449 Fax: 03-818-8914 Scandinavia: A/S Con-Trade Norway Tel: (04) 41 83 51 Fax: (04) 41 94 72 UK: Pinna Electronics. Scotland Tel: (0294) 605296 Fax: (0294) 68266 ALPHA Pi OXQ 242-RE West Ave. Darien. CT 06820 USA (203) 656-1 806 Fax 203 656 0756 CIRCLE 293 ON FREE INFORMATION CARD Low Cost Data Acquisition and Control A-Bus Sensing & Measuring: Read switch status. Detect or measure voltage. Read pressure, temperature, weight and other sensors. For example: * High-Speed 1 2-bit A/D converter: 8 1 0/js analog Inputs. 1 mV resolution $179 * 8 Bit A/D: 8 inputs, 0-5.1 V in 20mV steps. 7500 conversions/sec. $142 * 12 Bit A/D: ±4V in 1 mV steps. 130mS conversion time. 1 input, expandable $153 * Temperature Sensor: 0-200°F 1° Accuracy. 10mV/°F. $12 * Digital Input: 8 opto-isolated. Read voltage presence. switch closure. $65 * Latched Input: Each individually latched to catch switch closures or alarm loops. $85 * Touch Tone Decoder: $87 * Counter/Timer: 3 1 6-bit counters. Generate or count pulses. Time events. $132 * Clock with Alarm: real time clock with calendar and battery backup. $96 A'Bus Switching & Governing: Switch any type of electrical device. Adjust level or position. A sampling: * Relay Card: 8 individually controlled industrial relays. 3A at 120VAC. SPST. $142 * Digital Output Driver: 8 outputs: 250mA at 1 2V. For relays, solenoids... $78 ' Reed Relay Card: 8 individually controlled relays. 20mA @ 60VDC. SPST. $109 * Multiplexer: Switch up to 32 channels to a single common. $83 ' Smart Stepper Motor Control: Micropro- cessor controls 4 motors. English commands for position, speed, units, limits, etc. $299 * Telephone Control Card: On/off hook, generate and decode touch tones, call progress detection. $159 * X-10 Controller: Control and sense standard wall outlet power modules. $1 49 * Voice Synthesizer: Unlimited vocabulary, text to speech software built in. $159 ' D/A: Four 8 Bit Outputs. Adjustable full scale. $149 * 24 line TTL I/O; connect 24 signal, TTL 0/5V levels or switches. (8255A) $72 A-Bus Adapters and Software: Adapters connect A* Bus cards to your particular computer. * Plug-in adapters tor IBM PC/XT/AT/386 anc compatibles ($69). Micro-Channel ($93), Apple II. Commodore, TRS-80, * Serial adapters for Mac, PC, etc. * Odin PC compatible software. Control relays from analog inputs or time schedules. Logging. Runs In background. $129 RE-SHOPPER 6! it AMIGA-Commodoreiy^S^ Chips... Parts.. .Upgrades 6526 $12.25 6567 $14.95 6581 $11.25 PLA (62S100) $12.95 All 901 Ftoms $10.95 1 x 4 MEG/BO NS (ZIP) $57,95 A5Q1-512K Ham $99.50 8362 Denlse $39.95 8364 Paula $49.94 8520A , $17.95 1.3 Kickstart Rom $27.95 256 X 4/100 $9.50 1 MEG X 1/120 $9.40 Commodore Diagnostician #6 No* fix your own computers with 1 his fantastic diagnostic toof. Save lime ajxi money by promptly locating faulty chips on all Commodore 64 Computers and 1571 drives. Utilizes sophisti- cated cross reference methods. Over 15.000 sold. Received fantastic review in many magazines including lull, page in "Computer Shopper" $6.95 rr>cludes postage. • NEW, POWERFUL • REPAIRABLE C^64 POWER SUPPLY # 13-month warranty • Complete schematic in- *p& 0*7 eluded * External fuse— runs cool • UL Ap- ** t*iS proved # Heavy duty— perfect for 'packet radto" PLUS * Conservatively rated (it 1 S amps * Made by UPS Commodore sub-conilractor Amiga Upgrade New 1 Megabyte Falter AGNUS" Chip 8372 S99 50 with simple step step 10 mm Instructions and chip puller SEND FOR CATALOG ON EXCLUSIVE NEW PRODUCTS THE GRAPEVINE GROUP, INC. 3 Chestnut St., Suftern, N.Y. 10901 ___, 1-800-292-7445 • (914) 354-4448 t— Cil FAX (914) 354-6696 KE2 Deal** Pricas Available Prices Subject To Change 60dB display dynamic range 40dB spurious rejection 60 uv sensit, ±2dB flatness 1 KVDC. 1 v @ 1 00 MHz max input as isolated by 10pF ±7%hor frequency linearity «" SPECTRUM PROBE converts your scope into a 1 00MHz spectrum analyzer $249 dealers wanted 30 Day refund VISA/MC Specifications & a pp. ideas Smith Design 1324 Harris Dresher, PA 19025 (215) 643-6340 Z COMPUTER 2 5 MUSICIAN c ■3 COALITION - the Nation's Computer/Music Enthusiast's Users Group 1024 W. Willcox Av. Peoria, IL 61604 thor's own virus-detection system). Money-saving coupons for all eight pro- grams are included in the book. THE WONDERFUL WORLD OF HAM RA- DIO: AN INTRODUC- TION FOR YOUNG PEO- PLE; by Richard Skolnik, KB4LCS. MFJ Enterprises, Inc., P.O. Box 494, Mississippi State, MS 39762; 601-323-5869; for or- ders, 800-647-1800; fax: 601-323-6441; paper- back; $7.95. If you're considering buy- ing a youngster a ham radio this Christmas, consider including a copy of this fun- to-read book that de- scribes what ham radio is all about and why it can be a valuable part of his or her life. The book explains how hams can use radio com- munications to learn about computers, electronics, geography, and more. It THE WONDERFUL WORLD OF IIAM RADIO CIRCLE 31 ON FREE INFORMATION CARD illustrates how hams pro- vide valuable communica- tions services during emer- gencies, and even includes an actual emergency QSO, Finally, it explains how to get a ham license at set up a station to talk to other hams around the world. The book is filled with pho- tos of radios, ham stations, Field Day setups, and stu- dents learning about and using ham radios. R-E Try the JEleclgoniES- bulletin board system (RE-BBS) 516-293-2283 The more you use it the mors useful if becomes. We support 300 and 1200 baud operation. Parameters: BN1 (B data bits, no parity. 1 stop bit) or 7E1 (7 data bits, even parity, 1 stop bit). Add yourself la our user files to increase your access. Communicate with other R-E readers. Leave your comments on R-E with the SYS0P RE-BBS 516-293-2283 SPECIAL FROM ETT □ PCP107— DIGITAL LOGIC GATES AND FLIP- FLOPS ... $10.00. Estab- lishes a firm foundation tor the user who wants to design and Iroubleshoct digital circuitry and wants to know more ttian a few rules ol thumb. Mo back- ground beyond a basic knowledge of electronics is assumed. D PCP108— COMPUT- aERS AND MUSIC ... $3.95. Helps you learn the basics of computing, run- ning applications pro- grams, wiring a MIDI system and using [he sys- tem to good effect. In fact, iiisi about everything you need lo know about hard- ware and programs. □ PCP109— EVERYDAY ELECTRONICS DATA BOOK ...510.00. Presents the essential theory of electronic circuits and also deals with a wide range of practical electronic ap- plications. Info is pre- sented in the form of a basic electronics recipe book. □ PCP110 — ELEC- TRONIC POWER SUPPLY HANDBOOK. ..S1D.U0. All types of power supplies are covered, starting with cells aod batteries, on to rectified supplies and lin- ear stabilizers, to modem switch-mode systems, 1C switch -mode regulators, DC-DC converters and in- verters. D BP285— BEGINNERS GUIDE TO MODERN ELECTRONIC COMPO- NENTS ... $6.50. Basic functions of resistors, ca- pacitors, inductors, di- odes (including Zeners and Varicaps). tran- sistors. Thyristors. opto- electronic devices, op- amps, logic ICs. speakers and microphones, and meters are all described. Sort of a beginners bible of electronics. MAIL TO: Electronic Technology Today, Inc. R0. Box 240 Massapequa Park, NY 11762-0240 SHIPPING CHARGES IN USA AND CANADA 10.01 to$5. 00 ...$1.25 $30.01 to S4Q.0Q 15.00 $5 01 to 10 00 $2,00 $40,01 to $50.00 $6,00 $10.01 to $20 00 $3.00 $50.01 and above $7.50 $20 01 to $30.00 $4.00 SORRY, No orders accepted outside of USA and Canada Total price of merchandise . $ Shipping (see chart) S . Subtotal $ Sales Tax |NYS only) $ Total Enclosed $ Name Address City State Zip RES 66 RE-SHOPPER %jKELVIN- Electronics BREADBOARDS FOR LESS! durable - made of the highest quality plastic - Designed to withstand thousands of insertion cycles Fig. A B C D Stock No. 680093 680097 680098 680099 Contact Points 500 840 1380 1580 YOUR COST $ 4.25 ea $ 5.95 ea $11.75 ea $15.75 ea THE KELVIN LDT Laptop Digital Trainer ONLY $ 99. SlockNo. 840460 L.E.D. RED (in 100+ Qty) Stock No. 260020 6(2 TIMER - LM555 Stock No. 600021 20 xt ea. (in ioo 2 t; . c minimum dark resistance- Z25 oh-ms Max vottaga 170V peak. Peaks at 6900 angstroms. No. 260017 YOUR COST $ .99 ea SULPHIDE PHOTO CELL l.SK Ohms 4f 2 ft., C mrtrrniril $ 389.95 64.95 59.95 cy.ua 8.95 21.95 19.95 59.95 PTI PTI PTI PTI XT-RLL HARD DRIVE CONTROLLER w/cablas S XT-MFM HARD DRIVE CONTROLLER u/oable*. $ SPEEDLINK 248B1 MODEM. w/toftMre, cab le,2VR WARRANT*. S 6 OUTLET SURGE PROTECTOR STRIP ..S 6 OUTLET SURGE PROTECTOR ../MODEM PROTECTION. S JOYSTICK, ADJUSTABLE CENTERING,. /FIRE BUTTON S FXUS 2881 KEYBOARD, 101 Key., AT/XT, e/Flip Cover $ 368K/1.2MEG FLOPPV DRIVES S 64.95/74.95 1.44 MEG Floppy u/5 1/4 Mounting kit S 7a. BO XI-FLOPPY CONTROLLER, 368,1.2,728.1.44 Drives S 49.95 TOCOHN 5583VIP-55B7 TEST CHIPS (NO Ml. SALES) S 29.95 SUNSHINE EW9B4B EPRON PROGRAMMER 4 GANG u/eofteare. ,S 129.95 ■ALL HARD DRIVES COME MTH 5 1/4" MOUNT AND 1 YEAH WARRANTY* MITSUMI RF MODULATOR Crystal controlled, 'RCA' phono style output connector. Used by Birdview tor their Satellite receivers. Super tor projects I ONLY $5.00 GENIUS GM-6X MOUSE Including Dr. Halo III Graphics Software. ONLY $32.95 ! LORAN ANTENNA MOUNT This is a Loran antenna mount with builtin amplifier used to receive the Loran Navigational signals used on ships & boats to locate their position. The antenna mounts can be converted for "Ham or CB use. The built in amp is low freq. usable in the 40-400khz range. Comes with appro*. 35 ft of cable, ASTEALATONLY! $15.95 IC'S-EPRDMS TMS 4464-120 (np) I 3.00 TMS 4464-150 (np) 2.80 271 28 Eprom (pe) 2.75 27256 Eprom (pe) 3.25 27512 Eprom (pe) 5.00 2708-2716-2732-2764 CALL Eprom Eraser w/tlmer 25 Piece 124.95 MITSUMI TUNER UHF p/n UES-A55F These are standard uhf tuners with a 70 mhz output These are used in many TV's and VCR's Price is ONLY $5.00 4 WAY SPUTTER DC Passive WOW! ONLY $5.00 UNIVERSAL PROGRAMMER ■ PROGRAMS BElFROMi ^ii i^&^ l .-!b ,■ :< mi - - ma «m n s$ -itbem ,.. avir -— am turn HESS ma m mjim ■■■'. - GALi-ten LATTICE HE ■. ■ r-L, to yrflmcs PtCLi ton £7 HVtJ*f«J ^ .~i\p BlftXAJ* PHGH, ■ SUPPORTS m- *CNDSPUt a* 4 GASC idiem pausm: cum *srt r*.v. ^;Afi jr.™, , mi '.-mnexnas «,-] risi ,i -™ (jAL WCttn« t>fi^'t '*: ■ ; ■ (TCttlGTOI X \ V !«"■■■>, jfnatfBiw "«« C%TTLCMQ5.A O S M*wv» K* «* i» ■ PKUjfKVkrfrt i.-th.«:T p -.-i"^ - . - J. , . .■■>-- ... 1 S N ifetMl ■ i ; HKWt TRACKER II & III REMOTE CONTROL UPGRADE KIT These units will upgrade your Houston Tracker II & III Satellite Dish Controller. Control your dish from your armchair!! These units are UHF controlled and can be used for any projects, robots, airplanes, cars, or anything you want Great for experimenters!! PRICE ONLY $15.00 ft h if n DON'T SEE WHAT YOU NEED? CALL!!! Computer, Satellite Electronics and Morel!) FREE CATALOG!! r l MotteiCord 1 ^ Send Orders To: Lesko's 6614-7th Street Kenosha, Wl 53144 Phone Orders:(414) 553-9440 Fax 0rders;(414) 859-2928 Hours: Mon-Fri 9-5 Central Time Closed Sat-Sun Minimum orders: $10.00. Minimum shipping & handling $5.00. MC , \ VISA, M.O. and CODs. Wisconsin residents add 5% sales tax. Not responsible for typographical errors. All merchandise subject to prior sale. 20% restocking fee for returned orders. Returned orders require R/A Number. Sony No Personal Checks. WE BUY SURPLUS & OVERSTOCK ELECTRONICS Send usafax with discription/price and quantity. J RE-SHOPPER A Complete Electronics SUPERMARKET! Visible Laser Diode * •.•••••..••.•••>• $45 « 00 5 Volt Power Supply 120 AHipS LaMbdd iIdre-D-3-OV * t*VW w/mar.unl ' .$195.00 .$250.00 Helium Neon Laser nibe $19.95 Approx. Imw *■ 'i'nns, «ij Gooidl * without pow«i- "upjily * Rechargeable Batteries * - - - $4.95 6VDC e 3Jtmp Haux * s . &**»! . a "aea . 3 " * a E»i«c.« Kinlmum * AA Alkaline Battery Pack <«*%# * b»/so d«^* cod* * Bui»»d for voit*?*) 4 x AA 6 volt * ... * - .....<...♦.. , p^ r . paD k $0*95 8 X AA 6 VOlt^high^^ o«rr-«t> • - - 1--^ I*«^ $1-49 Lens/Hirror Unit ■ •••.■ ■ * • * • . • $4 . 95 From eppy m*m.ctii.n» * ifc»y iriAjl Opti«l- a IX*" PJLatio/CoiVwk Ltop * Super Magnet * « . * - *o *« $9.95 Koe-* »Mrfch * nppx-Q?c 1/a*' *e 1/2" ^ 1/31" * incredibly -taron^ * Low Hoise Converter $9-95 3 „ 7 — * . 3 OH z ixi * TO l-ulw: IE - * 120 0».JE-** * Carbide Drill Bits ....**.... - **.«* .*,*« «* so $4* 95 F'^f ^C bua^Of * + C24" * S. C.S.I. Cable $9.95 DB2 5 mala i=.o so pin BUi« n.iHbon mal.* * 3+ * w^w 1 * Sua Micro Systems Hi-Res Color Monitors •■ $495 . 00 1*" * Sony CUT * Mon #360-1033-01 * MAC XI HI-K*v compatiDl* * Battery Charger $19 . 95 oalux* £osr ni-CBda * D.CAA. »v * tr*. li*t*a * 1 GHZ Band Pass Filter ...$19.95 ska in * one * HKWl * Hyundai Monochrome Monitors 12" Amber * IBM/Hercules Compat. .> $59.00 .$1495.00 286 Laptop Computer <«,!„ iR/t-^op) 2 MB Hard Di m It * 1 .44 Floppy * Moa*m * Carry Clti * uotr:£B& * io hkx * sio/i-io * Haltek Electronics is a 15,000 sq.ft. retail store in the heart of silicon valley. We offer one of the most diversified selections of high-tech goods from the oldest to state of the art. We are exceptionally strong with computer products, ICs passive components, electro mechanical, optics, wire & cable and probably one of the biggest inventories of Lambda power supplies around. We do not have a catalog or a product listing, due to the ever changing supply* So give us a call and we will be happy to check stock for any and all your electronics needs. HALTEK ■ ELECTRONICS 2&3S3 1062 LINDA VISTA AVENUE • MOUNTAIN VIEW, CA 94043 • 408-744-1333/415-969-0510 70 RE-SHOPPER A Complete Electronics SUPERMARKET! XT Mother Boards <„.*„ • B xT Ur b D , $49,95 BOBS - H HttX * S4DK opt. * 286 Mother Boards t<3rd . t ( ,/i>i- 13| ...$99.95 XT c-ompyatJ-fci 1* * 13 MHX * laby * 20 MHz Oscilloscope < „,,.,„, . „.„■,, .-,„„,- 2( >oo , $295.00 DUAl I L r-rtfr:*» * TV Ja^ncr. Filter * 2 «aOll Xl, K«£, , Kit) STohon * 35 MHz Oscilloscope- <„n„ •■vi«hi..i.-moo, • $389.00 Dual 'rr*atcai * DatJ.aya.i3 t single awaapj *rr»c±aB * iOn.v. RJLr« Tliu * Z JkE4.B Int.noltj' MO cl * 2 00. Xl, P a * * , XlO ]?X-Ql>Bai * EFROM Programmers * wysortw»r-B * iw cpmpntibi* * s-ria to 27513 * One Gang ,„.,„ ^/.ciioh) $59.95 Ten Gang <„*.«,„ » »•■:,.»<:,«- ie, SALEl $149.95 150 Watt Power Supply - XT Mmp « t i& i. - $39 . 95 200 Watt Power Supply . AT CMo^^titoi. - $49.95 VGA Color Monitor {=rd . r ■ R y VE *. MM ± ce >i-> $295.00 1*- - Tile r. avriv*! Bab* * Ra>li.ayv Hod »BffOSi 3 * CGA Adaptor <„n. r .R/ocj $19.95 Hard Disk Controller for XT Compatible (srd . c ts/n , C ) $29.95 Support. ID Driv. Typ*a * w/Cttblaa and jocuntncACion * ELLL Hard Disk Controller for XT Compatible <0 M«rr *k/klio $49. 95 3d faatar data trsi»£«r * Bom nan -Ldeanr. pra-7ornmc * ril Drivaa Dnlyl Hard Disk Drives Factory Refurbished * 1 Tr Exchange by Haltek 20 MB Hard Disk . s-o. «t- bt-zzb ..$179.00 30 MB Hard Disk . s . DS „ t . s t - 2 3bh .SALE I $135.00 40 MB Hard DiBk . 3 «.„ „ t . >t-hi-i - 2 a ™. - $249.00 80 MB Hard Disk . „„„«_ st—.os* $299.00 340 MB S. C.S.I. Package Deal KC) $995.00 1S-RIB * W^V* , D . " B m . C . S . X * Controll.r B Cakblaa - 1 ¥r Warranty * 340 MB E. S.D.I. Package Deal ,^1..,.,^:, $995.00 IBma - wsw.r?. 'at IE . B . t> . X . Contrcllac * cablaa * a Tr Harrancy • 49 MB Hard Disk SALE! $179.00 saagata ST-157R * RLL * 3.S" * Haw * X Tr Ixchanga * • - • A I O U T II U I f. f 1 I. R B S - • • Oiir rrfiirtliriml inventory contains itrms !h*l fall into imp i«r more ill I he M lowing catagorirs; I) failed primary Inline. 3) win sold ami ■ etui net! as tailed, 3) tiisnlt*lhally imperfect. In any ra-*e, thr item was rellltrwd to IheO.K.M- (original pqoipmenl manufacton-r} .md was monditioned or lined to original manufacturers sjKviliratumv IIAITFiK guarantee* all refurbished products for 90 days from the dale of piHihaw. Any ilem may he mi hanged within thai period. The management of Halted fihrttimios requires Ihal any returns he in the original packaging ami lie ■-iimiilrlr, in< hiding any and all manual", rsHra, software, etc. and musl he fkTompnnied hy Ihc original ub receipt. Prircs sohjecl lo change without notice • CJuanliiies limited to slock on hand • All items air refurnished unless indicated as "new" BBS# t(15) 96MW1 HALTEK ELECTRONICS kanV] &<«.(< 1062 LINDA VISTA AVENUE • MOUNTAIN VIEW, C A 94043 • 408-744-1333/415-969-0510 CIRCLE 251 ON FREE INFORMATION CARD RE-SHOPPER 7 r FREE CATALOG Loaded With Satellite TV Products At Discount Prices "\ • Complete Systems • Upgrades • 2ft to 24ft Dishes •Parts • Accessories • Major Brands • Factory Fresh • USA Warranty • Fast Delivery Satellite WORLD SATELLITE TV AND SCRAMBLING METHODS "The Technicians' Handbook" This thorough text is a must- buy lor technicians, satellite professionals and curious do-it-yourselfers. The design, operation and repair of satellite anten- nas, feeds. LNBs, receivers and modulators are ex- examined in detail. An in-depth study of scrambling methods and broadcast formats including the VldeoCipher II, Oak Orion. FilmNet Sky Channel, EuroCypher. D2 MAC. BSB and Teisdub Payview III. Circuit and block diagrams of all components are presented and dearly examined throughout the handbook. This information is a prelude to the chapters on troubleshooting and setting up a test bench. This expert guidance on testing, servicing and tuning is complimented by a wealth of detailed Illustrations. 340 pages, 8 1/2 x 10 3.8 over 200 photos, diagrams, wiring tchtmitles and 16 tables I appendices I index Order 0O23Q13 S4H J4 (U.S.) J39.95 THE SKYVISION DO-IT-YOURSELF INSTALLATION VIDEO Wow You Can Watch It Being Done" Installing or Tuning up" your satellite system made simple. From start to finish, the Skyvision Do-lt-Yourself installation Video is a step-by-step video that will help you set-up your systems in no time flat. Its like having our trained technicians right at your site helping you with every step. Order W2001 VHS S&H $3 (U.S) (33.95 Order 0020014 Beta S&H $3 (U.S) $33.95 TV Anywhere TUNE YOUR DISH TO ITS MAXIMUM! "With The Pico Signal Meter" A must (or the serious dealer or satellite system owner. Saves lime, frustration and money. Use when installing a new system, moving your dish, re-alignment of a dish that has been moved by wind, frost heaves etc., gets you tight on the satellite belt for the best possible pictures! The PP-1450 Pico Peaker is a super sensitive signal meter used for antenna aiming, focusing, peaking and polarity alignment. The multi-purpose Peaker can be used on any receiver system with block down-converted frequencies between 7G and 1500 MHz. (Does not work with older single conversion receivers - Ask for Bulz-l-Meter) The Peaker comes in an attractive case with neck strap. Order 0925003 „._...S4H 15 (U.S.) WS.9S Optional tump cable kit Connects Peaker to LNB (Kit includes 2ea . 1 7 coax cab tes w/ sp licer) . Order 0025007 S&H $3 $7.95 IRDs / RECEIVERS / SYSTEMS "Save $$$ on Packages" System package includes: OR8ITRON 10 fool mesh dish, SOdegree LNB, 18" Jack Arm, Feed- horn and Receiver/IRQ of your choice, plus a FREE detailed installation Video. IRQ/Receiver System UNIDEN UST2200 (Receiver) $219 UNIDEN USTgoOO [Receiver) $459 $999 UNIDEN UST7700 (IRD) $909 $1449 UNIDEN UST99O0 (IRQ) $997 $1529 UNIDEN UST440O (IRQ) $939 $1477 UNIDEN UST48O0 (IRD} $1599 $2139 HTSV (IHD) $1025 $1569 HTS VIII Plus (IRD) $1177 $1719 HTSX (IRD) $1328 $1869 DRAKE ESR324b (Receiver) $239 DRAKE ESR924i (Receiver) $599 $1149 DRAKE ESR1024 (IRD) $909 $1459 DRAKE ESR1224 (IRD) $1039 $1577 DRAKE ESR1424 (IRD) $1229 $1769 ECHOSTAR 4000 (IRD) $859 $1399 TOSHIBA TRX 120 (IRD) $1179 $1717 TOSHIBA TRX 2000 (IRD) $1585, $2119 Just a partial listing of hundreds of products listed in the Skyvision catalog. Ask for your's todayl Skyvtsiortj Inc.* 2048 College) Way Fergus Falls, MN 56537 - Toll Free 800-334-6455 Mail in coupon or call Toll FREE today for the SKYVISION Satellite TV Product Catalog. Delivered free to your mail box in U.S. and its holdings. * International requests add $8.00 to cover shipping and handling. ^ Send Skyvision Satellite TV Products Catalog Name Phon e ( ) Address. City State. ZiP_ Install A System, Upgrade or Repair Yourself And Save $$$$ ^r^ 72 RE-SHOPPER CIRCLE 254 ON FREE INFORMATION CARD ings are on the knob. For exam- ple, the knob setting of 5 volts per division appears as a readout di- rectly on the CRT near the wave- form display. You just turn the knob a little one way or the other to scroll up or down through the settings. The screen readout tells you where you are. In the most advanced scopes. there may only be one or two knobs on the front-panel. That's it. You determine what a "soft" knob do by making selections from a screen menu, as shown in Fig. 1. If you want to adjust the vertical sensitivity, simply select VERT from the screen menu. then adjust the knob for vertical scaling. Select HOR1Z, then POS, and the knob becomes a horizon- tal position control. There are two big advantages of displaying scope setup and control readouts directly on the CRT — the user can make quick measurements, without taking his or her eyes off the screen, and it helps with screen photographs, where all of the pertinent information about the measurement is displayed on the CRT. The automatic setup feature makes setting up the scope easy and efficient. With an automatic setup button, the scope automat- ically senses key setup param- eters from the waveform at the probe tip and sets itself up for a standard display of that wave- form. The usual scope controls are also available to change set- tings or to set up special func- tions, such as delayed sweep or single-shot triggering. Single- button setup of initial displays is a definite advantage, and a con- venience that's quite easy to get used to. In addition to automatic setup features, many scopes also have front-panel controls that allow you to store and recall setup con- Figurations. Such advanced fea- tures allow you to set the scope up one way for a waveform mea- surement and store the settings in a memory location. You'll then be able to set the scope up in a completely different way for an- other measurement, and store those settings in a different memory location. Switching be- tween the measurements then becomes a piece of cake! Automatic memory recall is particularly useful if you're trac- ing a waveform through various circuit stages and need to repeat several scope setups at each stage to check waveform param- eters such as rise time, pulse width, and repetition rate. Sim- ply push a few buttons for the setup you want. The number of front-panel set- tings that are stored in a scope depends on the amount of memo- ry provided for that purpose. Also, if the memory is non- volatile, the settings will still be there for recall the next time you turn the scope on. Screen cursors and push-but- ton measurements are still other features that are appearing more on analog scopes. Screen cursors are a set of lines or other markers that can be moved to any place on the screen (see Fig. 1). The screen location of the cursor, in terms of amplitude or time, appears nu- merically on a screen readout. By properly positioning two cursors on a waveform display, it s easy to measure peak-to-peak voltages or rise times. The features discussed so far have been enhancements to the traditional analog scope; the waveform being probed, dis- played, and measured has not been digitally altered in any way. Because an analog waveform is displayed in real time on an ana- log display, it must be repetitive in order to remain on the display long enough to be measured by counting divisions, placing cur- sors, or using push-button mea- surements. Digital scopes offer many ad- vantages and conveniences over typical analog versions. Lets find out why some prefer to use digital scopes over their analog counter- parts. ! 1 1 I 1 >■.. s* i *--m m*< ,«o nis V>A" '. CO o z o CC s- o LD _l W o □ EC Digitizing scopes Some key elements of a digital scope are shown in the block di- agram of Fig. 2. The analog wave- form is sampled and digitized after the input signal is con- ditioned. The digitized waveform is stored in digital memory, from which it can be recalled at any time for processing, display, and measurement. All of that occurs automatically, and is set up using the same basic controls as a tra- ditional scope. Additional con- trols are used to select memory- locations for waveform storage, and any processing or analysis that occurs during or after wave- form acquisition. Waveform digitizing offers sig- nificant advantages to the tradi- tional approach of waveform viewing and measurement. In terms of scope design and man- ufacture, a wideband -signal path to the CRT display no longer has to be provided. Also, the CRT speed requirements are reduced since waveforms can be recon- structed from digital memory. Some digitizing scopes even use LCD displays, which eliminate bulky CRT's and their associated power supplies. Some primary advantages of waveform digitization are: • Waveforms that would appear as a brief flash (single-shot or low-repetition pulses) or a slowly moving dot (low- frequency sig- nals) on a traditional analog scope, can be frozen on the screen for observation and analy- sis later on. • Waveforms can be captured at different times and places and displayed together for purposes of comparison. • Various amounts of waveform prior to the trigger point (see Fig. 3) can be included in capture and display, allowing complete and detailed analysis of rise times and any waveform p res hoot. • Signal averaging, enveloping, peak detection, and other types of processing can be used to en- hance or emphasize certain as- pects of waveforms. • A wide range of analysis pro- cedures can be applied to com- pute waveform parameters either as built-in scope features or by transferring digitized waveforms to a computer for software based waveform processing. MEASUREMENT READOUT CURSOR READOUT MENU KEYS SOFT KNOB SCREEN CURSORS FIG. 1 — SOME OF THE MANY features that are changing the face of traditional analog scopes, as well as digital scopes are screen menus, soft knobs, automatic setup, cursors, and front-panel settings with storage and recall. INPUT V, N ■*] SIGNAL SCALING r — i OPTIONAL ANALOG SIGNAL DISPLAY ROUTE i WAVEFORM MEMORY _i*- WD TRIGGER WAVEFORM 1 WAVEFORM 2 WAVEFORM 3 WAVEFORM n WAVEFORM PROCESSING ...u DISPLAY U FIG. 2— THIS IS A BLOCK DIAGRAM of a digital scope showing analog-to-digital (A/D) conversion taking place immediately following input-signal conditioning. Some digital scopes may also have an optional nondigitizing mode for use in initial scope setup. The items mentioned above are just some of the many advan- tages provided by digital scopes. There can also be disadvantages which can be minimized through a better understanding of basic waveform digitizing. Waveform digitizing up close Waveform digitizing involves three processes — sampling, ana- log-to-digital (A/D) conversion, and storage of the digitized sam- ples. Depending on the means of implementation, sampling and digitizing may be done in the same step, or separately. The end PRE-TRIGGER TRIGGER POINT ON ANALOG SIGNAL FIG. 3— TRADITIONAL ANALOG scopes display only the signal following the trig- ger point (post-trigger). Many digital scopes, however, can capture and display signal information prior to the trigger point (pre-trigger) as well as post-trigger information. Some digital scopes also in- dicate the trigger point with a "T" on the waveform display. 52 ANALOG WAVEFORM REAL-TIME SAMPLING INTERVALS ! I I ] I I | I II I I I I I II I I I I I I I I I I I REAL-TIME CAPTURE I lit • ~ 5u -*■ t REAL-TIME SAMPLING INTERVALS EQUIVALEffT-TIME CAPTURE t ACQUISITION 1 V y* «-^ I . /^^\ ■ -*- t ACQUISITION 2 -* t ACQUISITIONS • • • m r ^u ACQUISITION n FIG. 4— REAL-TIME SAMPLING CAPTURES all waveform samples sequentially as the waveform occurs in real-time (a), equivalent-time sampling achieves the same apparent results as long as the waveform is repetitively triggered for sample build up over multiple acquisitions (6). result, however, is a set of dig- itized amplitude samples repre- senting the analog waveform. The rate at which sampling is done determines the sample in- terval of the waveform and, there- fore, the time resolution of the waveform representation. De- pending on your needs, that can be looked at in terms of resolving rise times, or number of samples per cycle for overall waveform def- inition. For example, a 100- megasamples per second (MS/s) sampling equates to a sample in- terval of 10 nanoseconds (1/100 MS/s). That sampling rate is quite adequate for defining rise times of 500, down to 50 nanose- conds, but inadequate for rise times of 20 nanoseconds or less. In simple terms, a 100-MS/s sam- pling provides 100 samples per cycle for a 1-MHz sine wave, a 10- MHz sine wave is sampled 10 times per cycle, and a 50-MHz sine wave is sampled only 2 times per cycle. Most digital scopes provide more than adequate sampling rates on all sweep-speed settings (seconds/division), as long as you are dealing with repetitively trig- gered waveforms. Just set the sweep speed, and the appropriate sampling rate is automatically set by the scope. That may not be the case, however, if you use sin- gle-sweep triggering for wave- form capture. With a single- triggered sweep, all samples must be taken se- quentially in real-time, as the waveform occurs. The limit of effectiveness is determined by the digital scope's real-time sam- pling rate. Some digital scopes have very high real-time sam- pling rates, some as high as 500 MS/s or even higher. Others opt for the economy of a low real-time sample rate, 10 MHz for example, and use equivalent-time sam- pling to cover the higher sweep speeds. The real-time sample rate, however, determines the resolution limit for single-sweep waveform captures. The differences between real- time and equivalent-time sam- pling are shown in Fig. 4. In Fig- ure 4-a, real-time sampling takes all samples in seqLience. The waveform is fully sampled in a single triggered acquisition. In Fig. 4-o, equivalent-time sam- pling builds up a full set of sam- ples by combining samples from multiple-triggered acquisitions of the waveform. Because of the multiple acquisition require- ment, equivalent-time sampling can be used only on repetitive waveforms. Even if you only need to cap- ture repetitive waveforms, the scopes real-time sample rate is still important. With a low real- time rate, it takes more triggered acquisitions to obtain a full equivalent-time set of samples. As a result, it takes longer to fuily update the displayed waveform after any waveform change. The delayed waveform display can cause an annoying time lag be- tween tuning a circuit under test or making a scope adjustment and seeing the waveform change completed on the screen. High- speed, real-time sampling and fast display update rates elimi- nate such display lag problems. Another approach used by some digital scopes is to provide an al- ternate analog signal path (non- digitizing mode) for real-time, nonstored displays in the tradi- tional scope manner (see Fig. 2). Regardless of the sampling method or speed, each amplitude sample must be digitized before it can be stored in the digital scopes memory. The number of bits used in digitizing deter- mines the amplitude resolution used in representing the wave- forms. For example. 6-bit sam- pling provides 64 digital levels (2 6 ) for describing a waveform captured at any selected vertical scale factor (volts/division). By contrast, 8-bit sampling provides 256 levels (2 8 ) of vertical resolu- tion, which is an improvement of four times the resolution. Figure 5 graphically shows how 8-bit sampling more accurately repre- sents the waveform amplitude than 6-bit sampling does. With the resolution advantage of 8-bit versus 6-bit sampling. 8-BIT LEVELS 6-BIT 6-BIT- 6-BIT 6-BIT xxx CO y Z o P O g Q < SAMPLE POINTS • 8-BIT DIGITIZED SAMPLES x 6-BIT DIGITIZED SAMPLES FIG. 5— RESOLUTION IS FOUR times bet- ter with S-bit sampling (256 levels) than with 6-bit sampling (64 levels). The result is a closer representation of waveform amplitude details. you might ask yourself why any- one would offer a 6-bit digitizing scope? For that matter, why settle for 8-bits? Why not go for 10-bit digitizing with 1024 resolution levels? The answer simply boils down to speed and cost. It's easier and less expensive to get high real- time sampling rates with lower resolution. Thus, some scope manufacturers use 6-bit sam- pling, and emphasize price and sample-rate advantages in their product specifications. The truth is, high sample rates and time resolutions have little advantage without adequate vertical resolu- tion. For example, to make rise- time measurements, you must first determine the 10% and 90% pulse amplitude levels before you can measure transition time, which is best achieved with 8-bit or higher resolution. Waveform processing and measurements When a waveform is displayed on both a traditional analog scope and a digital scope, it can appear to have distinctly dif- ferent details. That is often due to ambient noise riding on the waveform and the differences in how it is captured and displayed along with the waveform. A low-level repetitive waveform with noise presents a somewhat fuzzy trace on an analog scope display. The bright central portion of the trace represents the actual waveform on average, without the noise. The less brig- ht, fuzzy edges of the trace are the result of trace blooming (edge glow or spreading) as well as some low-level noise elements, as shown in Fig. 6-a. Much of the noise riding on the waveform, however, is not seen because the noise occurs randomly and, therefore, does not repeatedly trace the same course on the dis- play screen to build up any brightness. The CRT tends to average or suppress noise, blur- ring on the display, A digital scope, on the other hand, tends to display noise spikes, rather than averaging them out. If a noise spike hap- pens to coincide with a sample point, the noise is sampled, stored, and displayed as part of the waveform. Waveforms dis- played on a digital scope often ap- pear to be sprouting hairs, as shown in Fig. 6-b. You need to get used to seeing noise elements on digital scope displays that nor- mally wouldn't be visible on a tra- ditional analog scope. Many digital scopes do, how- ever, provide a signal averaging feature that can be used to reduce noise on a stored waveform by smoothing. With some scopes, you can select signal averaging and specify 16 averages of the waveform. The scope captures the first set of waveform points and stores it in memory. The sec- ond set of points is then captured and added to the first set in mem- ory. That process goes on until 16 sets of captures have been summed in memory. The sum of the captures is then point-by- point divided by 16 to get the averaged waveform. The advantage of averaging is that it reduces random noise. The amount of noise reduction increases with the number of averages selected, which corre- spondingly improves the signal- to-noise ratio of the waveform. TRADITIONAL ANALOG DISPLAY Ideally, the amount of signal-to- noise improvement is 3 dB for each power-of-two averages. For example, you will have 3 dB of signal-to-noise improvement for 2 averages, 6 dB for 4, and so on. Along with noise reduction, signal averaging also improves vertical resolution, which will oc- cur when the signal processing is done at higher resolutions than the original sampling. For exam- ple, an 8-bit digital scope that uses 16-bit processing can ap- pear, in effect, to be a 10- or 11-bit digitizer if enough signal averag- ing is done. That, of course, ap- plies only to repetitive signals since the signal must recur in order to be averaged. For most waveform acquisi- tions, signal averaging should be applied to improve both the dis- play as well as the measurement results. A digital scope that has an automatic peak-to-peak mea- surement feature looks for the maximum and minimum stored waveform values to compute a peak-to-peak result. If noise is in- cluded in the stored waveform, the peak-to-peak result will be af- fected by the signal-plus-noise maximum and minimum. By averaging the signal first, you re- duce the noise, and achieve a more accurate measurement of the signal peaks. In other cases, signal averag- ing may defeat the purpose of the measurements, which would be the case in checking digital sig- nal noise and timing margins. With that type of measurement, you want to see and measure the noise and jitter extremes; so don't use averaging. Traditional analog and digital scopes display waveform jitter in different ways. An analog scope DIGITIZED SIGNAL DISPLAY BRIGHT CENTRAL TRACE INDIVIDUAL NOISE COMPONENTS CAPTURED BY DIGITIZING FIG. 6— A NOISY SIGNAL APPEARS on an analog display as a bright central trace with dimmer, fuzzy edges (a), whereas a digitized signal clearly shows all captured noise elements as part of the stored signal samples (b). 54 display shows most of the wave- form jitter, but may miss the ex- tremes because they are too infrequent to cause a visible trace. Figure 7-a shows a jittered - pulse edge display on an analog scope of moderate speed. That display has multiple vertical val- ues for each point in time. As far as digital scopes go, they can't give you a true representa- tion of timing jitter because they normally capture and display only one vertical point for each sample point in time, as shown in Fig. 7-b. A digital scope can, however, show the full extremes of waveform noise and jitter vari- ations by using the envelope mode. Figure 1-c shows how the displayed extremes are captured by enveloping multiple waveform acquisitions, which are actually two stored waveforms — one con- sists of maximum values of the overall acquisition points, the other consists of the minimum values. Thinking literally What you should remember about digital scopes is that they tend to be much more literal in how they capture and display waveforms than an analog scope. Getting used to that requires some thought about what you ex- pect, or need to see in a waveform capture. If you want to see a "cleaned up" version of the wave- form for measurements such as peak, rise time, and fall time, use signal averaging. If you're trou- bleshooting a noise or timing problem, you'll want to see the actual waveform, so don't use averaging. Or you may just want to see the extremes represented by the envelope of point-by-point maximum and minimum values of a waveform. Thinking literally also applies to many automatic measurement features. As an example, you wouldn't expect to find a DC com- ponent in a sine wave that's been passed through a coupling ca- pacitor. The sine wave's mean val- ue over time should be zero, however, the mean value of a sine wave on a digital scope probably won't be zero. Is the digitizing scope in error? Not really when you stop and think about the waveform and how it's captured and processed. A pure sine wave has a zero mean FIG. 7— WAVEFORM JITTER IS displayed differently, depending on the type of scope and capture mode being used; (a) is a display of waveform jitter or an analog scope of moderate speed, (b) is a display on a digital scope using equivalent-time sampling, and (c) shows clear representa- tion of jitter and noise extremes obtained by long-term signal capture using a digital scope in a continuous -enveloping mode. value only when considering en- tire cycles. If you consider 1.5 cy- cles, the mean value includes the additional fractional cycle. You're rarely able to precisely display a sine wave on a scope so that you see only entire cycles, with abso- lutely no fractional cycle, except if you adjust the time/division control in the uncalibrated mode. So, if you're feeding it 1.5 cycles of a sine wave, that's just what it's going to compute the mean value of. It does exactly what it's told to do, from exactly what's given. Nothing more, nothing less. The scope's display is correct, it's just not what you expected be- cause you were thinking in terms of the mean value over many cy- cles of the sine wave. If you apply about 20 or so cycles to the scope, a better result will be achieved because the computed mean over many full cycles will predomi- nate, and minimize the error contribution from an extra frac- tional cycle. If the digital scope's answer is still far from the expected zero mean, maybe you should take a closer look at the waveform you're examining. Maybe there really is a DC component, or a bias com- ponent from the circuit. Maybe the waveform really isn't a sine wave. Is it exactly symmetrical above and below the zero refer- ence level? And speaking of zero reference levels, did you capture a zero reference level just before you captured the waveform? If you didn't, the scope will use some previously established zero reference or a default zero refer- ence that may not be correct for the current waveform and front- panel settings. There's a lot to keep in mind when you're using a new scope to capture waveforms and compute their parameters. By under- standing how the new scopes work, you'll be able to get precise answers for your specific testing needs, and no longer have to glance at a waveform display and say, "that looks just about right." R-E Try the KZiEctnmics bulletin board system (RE-BBS) 516-293-2283 The more you use it the more useful it becomes. We support 300 and 1200 baud operation. Parameters: 8N1 (8 data bits, no parity, 1 stop bit) or 7E1 (7 data bits, even parity, 1 stop bit). Add yourself to our user files to increase your access. Communicate with other R-E readers. Leave your comments on R-E with the SYSOP. RE-BBS 516-293-2283 TUNE IN THE WORLD With RE's EZ Shortwave Receiver If you're looking for a fun project that won't break the budget, here's a shortwave receiver that's not short on performance. to g z o IT h- O Lii o Q < 56 IF YOU'VE ALWAYS WONDERED WHAT you might hear on shortwave ra- dio but didn't have the time or the money to get involved with it, then our simple, inexpensive shortwave receiver is the perfect project for you. It will have you tuning in on shortwave in no time — as a matter of fact, the first evening after the prototype was completed, stations from Ger- many, England, Cuba, Canada and France were easily copied. The shortwave receiver is a no- crystaJ set with an audio ampli- fier. It's a true superheterodyne that tunes 8.5 to 11 MHz in two bands and includes a 455-kHz IF filter, automatic gain control (AGC), tracking RF tuning, and a very sensitive detector. It's sen- sitivity of under a microvolt puts it in a class with some high-per- formance receivers. Theory of operation The shortwave receiver takes a very straightforward approach to the classic superheterodyne re- ceiver. The basic block diagram of our "superhet" is shown in Fig. 1, and the schematic is shown in Fig. 2. RODNEY A. KREUTER WA3ENK The RF input tank, unlike many simple designs, provides "tracking," in that the input tuned circuit changes frequency when the oscillator is tuned. RF tuning is performed by Dl, and oscillator tuning by D5. Both di- odes are Motorola MV209 varac- tors, which act as voltage- variable capacitors. RF energy is coupled into pins 1 and 2 of IC1, the Signetics NE602 double-bal- anced mixer. The mixer combines the in- coming RF signal with the local oscillator and produces an inter- mediate frequency or IF of 455 kHz. Both mixer and oscillator functions are provided by 1C1. Ta- ble I shows its specifications. To simplify construction and enhance performance, a ceramic IF filter, FL1, is used instead of a more common tunable IF trans- former. That results in a very clean IF that never needs tuning. The filters are available with bandwidths from 4 to 12 kHz to suit individual needs. The short- wave receiver will accept filters with input and output imped- ances of 2000 ohms. Turning to the detector circuit. D2 and D3 provide a 1.2-volt bias for diode D4 and Q3. The bias keeps both D4 and Q3 slightly on, so only a small signal is nec- essary for detection, reducing the gain needed before the detector and improving sensitivity. The signal at the base of Q3 contains two components. The AC component is the demodu- lated audio, and the DC compo- nent is proportional to the strength of the incoming signal. The DC component is filtered by R20 and CI 7 and is used to pro- vide an AGC signal to Q2 via AGC amplifier Q4. That helps to re- duce fading that is so common on the shortwave bands. The audio output stage, IC2, is a Motorola MC34119 audio am- plifier. It provides about '/i-watt of audio into speakers of 8 to 64 ohms. No large output-coupling capacitors are needed, but a large power-supply decoupling capaci- tor provides excellent stability. The prototype operates on a 9- volt battery and. if you listen at moderate volumes, they give you reasonable service. For longer service, use a pack of 6 or 8 "AA" cells, or an AC supply. ANT. RF TANK MIXER ifnLTER IF AMPLIFIER DETECTOR AUDIO BUFFER T NE602 OSGILLATOR AUDIO POWER AMPLIFIER AUTOMATIC GAIN CONTROL OSCILLATOR TANK VOLUME \ > C10-L C12j- R15> 10K T f T T -" 1 T ""2 VOLUME ^ J I 1 R20 220K 4 I 47DK C13I .1 R17 10K R23 RZ5 SDK 10K TUNING FINE TUNING ■■■■■■■■■■■■■■■■■■■■I FIG. 2— SCHEMATIC FOR THE SHORTWAVE RECEIVER. The unit is powered from a 9-volt battery, making it very portable. It's sensitivity of under a microvolt puts it in a class with some very high-performance receivers. SPKR 1 C14 ' 470uF Modifications and compromises Every engineer learns early on that to design is to compromise. Usually performance is traded off for reduced cost. This design is no exception. The basic design philosophy was to produce a rea- sonable receiver at a reasonable price. In that regard we're very happy with the outcome. We did, however, omit some features, as a result. Most modern shortwave re- ceivers include a beat-frequency oscillator or BFO. The purpose of the BFO is exactly as its name implies, to beat a local oscillator (LO) signal against the incoming RF to produce a heterodyne fre- quency in order to copy code (CW) or single side band (SSB). That can be done at either the RF fre- quency or the IF, although IF BFO's are much more common. The shortwave receiver's input coupling network provides tun- ing and impedance matching from the 50-ohm antenna input to the 1500-ohm input of the NE602. A really good receiver would use double or even triple tuning here, for better image re- jection and overload perfor- mance. Images, which are produced in the mixing of two signals, are > > - •< IE CO o z o cr h- o LU Q < (X TABLE 1— BASIC SPECIFICATIONS OF THE NE602 Power supply 4.5V-8V Current consumption 2.4 ma. (typical) Maximum mixer frequency 500 MHz (typical) Maximum oscillator Frequency 200 MHz (typical) Noise figure 5dB (typical at 45 MHz) Mixer gain 15 dB (typical at 45 MHz) Third order intercept - 1 7 dBm (maximum) Mixer input resistance 1.5k (typical) Mixer input capacitance 3 pF (typical) Mixer output resistance 1.5K (typical) Mixer output capacitance 3 pF (typical) very hard to eliminate. Re- member that the output of a mix- er is the sum and difference of two frequencies. For example, suppose we wanted to receive WWV on 10 MHz using an IF of 455 kHz. Using tow oscillator in- jection, we would generate a local oscillator of 10 MHz minus 455 kHz, or 9.545 MHz. However, if a frequency of 9.09 MHz was also present at the mix- er input, we'd also have an out- put frequency of 455 kHz because 9.545 MHz minus 9.09 MHz equals 455 kHz. That other undesired frequency (9.09 MHz) is called the image frequency. Some sophisticated techniques, such as image-reject mixers or up-converting receivers are avail- able, but almost all receivers re- ject the 9.09 MHz at the input tank. The tracking RF tank on our shortwave receiver helps a great deal, but doesn't eliminate the problem. Overload performance is an- other important aspect con- cerning a shortwave receiver. If the RF tank is tuned to 10 MHz, it wiil let 10-MHz signals pass and attenuate — but not eliminate — signals of all other frequencies. If a 50,000-watt AM station is lo- cated close to the tank, some of the signal will get through. If enough of it does, you'll hear the AM station as well as the short- wave. Tests on our active antenna (Radio-Electronics, February 1989) proved that an AM-reject filter was necessary to "clean up" our own local 50-kilowatt sta- tion. A high-pass filter that will attenuate AM stations by 40 dB is shown in Fig. 3; its low-frequen- cy cutoff is about 2.2 MHz. The filter can be constructed on a piece of perforated construction 100QpF TO 50-OHM ANTENNA 68Q0pF3 3.4p.H 29TURNS30AWGt ON T-37-2 CORE 820pF Hc- isoopr TO RECEIVER T^nmpf 4.8nH -X J35 TURNS 30 AWG ON T-37-2 CORE FIG. 3— THIS HIGH-PASS FILTER will at- tenuate AM stations by 40 dB. Its low-fre- quency cutoff is about 2.2 MHz. board using point-to-point wir- ing. Construction Even though this is a low-fre- quency project, a PC board is rec- ommended; you can make your own from the provided foil pat- tern or buy a finished version from the source mentioned in the parts list. Figure 4 shows the parts-placement diagram. Inductors LI, L2, and L3 are wound on toroid cores, so they're much smaller than air-wound coils, and can still be "tuned" by stretching or compressing the turns on the toroids. Remember that a turn is counted on a toroid every time the wire passes through the center of the core. After you tune the coils, the wire can be held in place with epoxy. Any speaker from 8 to 64 ohms will work with the MC34119. Ex- pect slightly less audio output with higher-impedance speak- ers. The speaker leads should be twisted tightly and kept short. If you use stereo headphones, don't connect the ground. Just feed the speaker output through resistors (you'll need to experi- ment with the value) to the left and right channels. Note that the MC34119 does not ground refer- ence the speaker. PARTS LIST All resistors are Vi-watt, 5%. R1. R12— 470 ohms R2— 15,000 ohms R3. R11— 3300 ohms R4. R6. R1 0—100 ohms R5— 2200 Ohms R7— 220 ohms R8— 5600 ohms R9— 22,000 Ohms R13, R14, R17, R24, R27— 10.000 ohms R15, R20— 220,000 ohms R16, R25— 10,000 ohms, potentiometer R18.R21— 470,000 ohms R19— 10 ohms R22-^t700 ohms R23— 50,000 ohms, potentiometer R26— 1000 ohms Capacitors C1— 9-60 pF trimmer C2— 82 pF, ceramic C3— 100 (lF, 16 volts, electrolytic C4, C21— 10 M-R 16 volts, electrolytic C5-C7, C9, C10, C13, C17— 0.1 m-F (poly- ester or ceramic) C8, C11, C12, C25--0.01 pF, ceramic 014^-470 p.F. 16 volts, electrolytic C15— 4.7 jiF, 16 volts, electrolytic C1— 1 u-F, 16 volts, electrolytic C18-C20— 100 pF, NPO C22, C24— 0.001 nF, ceramic C23— 47 pF, NPO Semiconductors D1, D5— Motorola MV209 varactor D2-D4— 1N4148 diode FL1— 455-kHz ceramic filter (8-kHz band- width Toko HCFM2-455C) IC1— Signetics NE602N mixer IC2— Motorola MC34119 audio amplifier IC3— 78L05 5-volt regulator Q1-Q4— 2N3904 NPN transistor Other components Lt — <3 turns #30 wire on L2's toroid core L2— 21 turns #30 wire tapped at 17 turns on T-37-2 Micro Metals toroid L3— 24 turns #30 wire tapped at 19 turns on T-37-2 Micro Metals toroid S1— DPDT switch S2, S3— SPST switch SPKR— 8-64 ohm speaker J1 — BNC connector Miscellaneous: PC board, metal cabinet, wire, solder, etc. Note: The following items are available from Q-Sat, P.O. Box 110, Boalsburg, PA 16827, A PC board only (# EZSW- PCB) is $7 plus S1 shipping; a partial kit that includes a PC board (does riot include potentiometers, switch- es, connectors, speaker, or case # EZSW-KIT) is S27 plus $2 shipping; a kit for the AM reject filter (# AMREJ- KIT) is S3 plus $1 shipping; a kit for the active antenna (# ACTANT-KIT, see text) is $15 plus $2 shipping. Pennsylvania residents must add 6% sales tax. Allow 3-5 weeks for delivery. All receivers need a good anten- na; this one is no exception. Al- though the first field trials were conducted in a state park with 30 58 feet of wire thrown over a tree limb, a good antenna will greatly improve reception. A dipole will give good results, but if you're cramped for space, try an active antenna (see Radio-Electronics, February 1989). A good ground also helps. The receiver should be in- stalled in a metal cabinet to re- duce the effects of hand capaci- tance and provide some shield- ing from strong local AM sta- tions. Figure 5 shows the prototype receiver. Note that the active antenna and the 2.2-MHz high-pass filter are used in the prototype, although they are not mandatory. The holes for the speaker were made using a neat trick: Draw the outline on a piece of perforated construction board, and tape the board to the cab- inet. Then use the board as a drill guide. Table 2 is a guide to let you modify the receiver for frequency ranges other than 8.5 to 11.5 MHz (actually 8.5-10 MHz for band 1 and 10-11.5 MHz for band 2) used in the prototype. Don't think of L2 and L3 as tapped coils, but rather as "selectable" coils. For example, L3 is specified as a 24-turn coil with a tap at 19 turns. What that really means is that a coil of either 19 turns or 24 turns is switch-selectable. You could even wind a 45-turn coil with taps at 14, 15, 17. 19. 24, 29, and 34 turns for L3. With the right switch (good luck finding one), you could tune 5 to 16 MHz in 8 bands. Remember that it has to switch the capacitors, as well. Since the coils must be hand- wound, there will be some varia- tion. Wire size was calculated for no. 30 wire. Other wire sizes may be used but you will find it hard to get as many as 45 turns on a T-37-2 core with larger wire. The spacing of the wire on the core will also change the tuning fre- quency. The values are given as reasonable starting points. If you wish to build the receiver for some frequency other than the prototype, follow these steps: 1) Build the unit completely ex- cept for the two coils. 2) Using Table 2, wind the os- cillator coil. Tack the coil into the circuit from ground to the junc- tion of C20, C22, and C23. (That way you won't need the band switch.) |S1-b 1 O-J-OBAND -CIS- CIS ) IC1 R5 — ca— -02 rj 6 p?4 1 TO - _„„_ | 5L4 %_, — jm — ^ 9 w " - — w^ 3 - S1-a BAND antV JlBCI ? IWT. «K + 9V FIG. 4— PARTS-PLACEMENT DIAGRAM. Be sure to install the circuit in a metal project case to help reduce interference. TABLE 2 Frequency C2 C18, C19 323 L1,L2(Ant) L3 (Osc) (MHz) (PF) (pF) pF) (# of turns on T-37-2 core) 5 100 120 68 5, 41 45 6 100 120 68 4, 30 34 7 82 100 47 4, 26 29 8 82 100 47 3, 22 24 10 82 100 47 3, 17 19 12 82 100 47 2, 15 17 14 68 82 33 2, 14 15 15 68 82 33 2, 13 14 TABLE 3 NE602 MC34119 Pin 1 1.27 V 0V Pin 2 1.27 V 4,15 V Pin 3 OV 4.11 V Pin 4 3.64 V 3.97 V Pin 5 3.59 V 4.14 V Pin 6 4.99 V 9.09 V Pin 7 4.33 V OV Pin 8 5.05 V 4.20 V Q1 Q2 Q3 Q4 Emitter 0.95 V 0.80 V 0.27 V OV Base 1.61 V 1.45 V 0.82 V 0.58 V Collector 2.56 V 3.30 V 9.17 V 7.41 V > -< 5< CO o z o C£ I- CJ 111 o Q < EC ACTIVE ANTENNA BOARD HIGH-PASS FILTER POWER VOLUME BAND SELECT FIG. 5— THE INSIDE OF THE PROTOTYPE RECEIVER. Note that the active antenna and the 2.2-MHz high-pass filter are used in the prototype, although they are not mandatory. 3) Lightly couple a high-imped- ance scope or frequency counter to pin 7 of IC1; note that the NE602 will not drive a 50-ohm input without a buffer. A 10-pF series capacitor is therefore rec- ommended. 4) Turn the tuning and fine tun- ing, if you are using one, com- pletely counterclockwise and measure the frequency. Now turn the tuning and fine tuning all the way clockwise and measure the new frequency. If it's lower than the first frequency, you've got the THE FOIL PATTERN for the single-sided board. potentiometer in backwards. 5) Add 0.455 MHz to the two fre- quencies that you have just mea- sured. This is your tuning range. If you are building the unit for a higher frequency range, say on the order of 14 or 15 MHz, you will find that the tuning range is 2 or 3 MHz. On the other hand, units built for 3 or 4 MHz will tune only about 0.5 MHz. That is caused by the rather small capacitance change of the MV209. Typically, capacitance vs. (reverse) voltage of the MV209 is 40 pF at 1 volt, 26 pF at 5 volts, 14 pF at 10 volts, and 9 pF at 20 volts. Low-frequency tuned circuits require more capacitance than high-frequency tuned circuits. Since the change in capacitance of the MV209 is fixed, it becomes a smaller percentage change with low-frequency tanks than with high- frequency tanks. And you can forget about a series or parallel com- bination of MV209's. The percentage works out the same as a sin- gle one. If you require more tuning range. the best method is to provide a separate, stable tuning voltage of up to 20 volts. Since the current drawn by the diodes is in the microamp range, a sepa- rate 9-volt battery may be used. Just remember that as the bat- tery ages, the tuning range will change. 6) If you are satisfied with the tuning range, wind the antenna coil with a turn or two less than the oscillator coil. This is neces- sary because the input tuned cir- cuit operates at 0.455 MHz higher in frequency that that of the oscillator. The varactors used in this re- ceiver only need to vary by about 15 pF to cover 8.5 to 10.0 MHz or 10.0 MHz to 11.5 MHz. That can be from 25 to 40 pF, or to 15 pF, or any combination that gives a change of about 15 pF. When the bias voltage is changed from 1 to 5 volts, the capacitance really changes from about 40 pF to 26 pF. If a well-regulated supply of higher than 5 volts but less than 20 volts is available, it may be used to increase the tuning range. Since we're running it on a 9-volt battery, we decided to reg- ulate down to 5 volts. If you de- cide to operate the varactor on a higher voltage, remember that the NE602 is rated at a maximum of 8 volts. The high side of the tuning potentiometer can be con- nected to a higher voltage as long as the connection from the PC board to the high side of the po- tentiometer is left disconnected. Tuning 1500 kHz with a single- turn potentiometer can be tricky. A "poor mans ten turn" can be made by putting a 10K potenti- ometer in series with the normal 50K potentiometer for fine tun- ing. Be careful with the leads go- ing to the potentiometers; any AC signal will "modulate" the os- cillator with disastrous results. Since the tuning of a varactor isn't linear with voltage, you may want to experiment with dif- ferent potentiometers, such as linear, log, or audio. Troubleshooting If you have any problems, the DC voltages shown in Table 3 should help. All voltages were taken with a new 9-volt alkaline battery powering the receiver. The volume control is about '/3 with no signal input. Total cur- rent is 22 milliamps. R-E 60 1990 ANNUAL INDEX OcicfrcfMcs Volume 61 and ComputerDicest Volume 7 1990 Annual Index Radio-Electronics Volume 61 and ComputerDigest Volume 7 Abbreviations: (ARE)Ask R-E; (AUD)Audio Update; (C)Construction; (CC)Computer Connections; (CD)Computer Digest; (D)Department; (DB)Drawing Board; (DN)Designers Notebook; (EW)Editors Workbench; (ER)Equipment Reports; (HH)Hardware Hacker; (KR)Kit Report; (LTR) Letter; (PCS)PC Service; (SR)Shortwave Radio; (VN) Video News; (WN) What's News AC Power Measurement ( Tnetley) Aug 51 .(LTR)Nov 1 6 Acoustic Field Generator (Templtn)(C) Jan 35, Feb 39,(PCS)Feb 59 Aclive fillers Nov 86 Windows 3.0, and ToolBook (Hotoman)(CC) Sep 86 COMPUTERDIGEST An nouncemenl (Holizma n ) ( E W) Feb75 Bool Irom ROM (Ho!lzman)(EW) Mar 71 Digiial Keyless Enlry System (Avritch)(C) Mar 71 Electronics Lab Simulation Program(HoHzman)(CC) Dec 86 Experimenter's 1-0 Card (Hanslip)(C) Jun 73 Floppy Heaven (HollimanWEW) Jan 81 Low-cost Logic Analyzer (Holtzman)(EW) Aug 73 MIDI-compattble stereo music scores (Holtzman)(CC) Oct 86 Personal computers and the future (Koltzman)JEW) Apr 69 Port-A-Matic (Grossblatl)(C) Jan 61, Feb 75 Readers Letters (Holtzman)(EW) Jul 75 SCSIESDI shootout (KoltzmanjICC) Nov 86 Talking PC, The (Holtzman)(EW) May 81 Windows 3.0; and ToolBook (Hctfeman)(CC) Sep 88 CONSTRUCTION 1 ,6-G Hz Counler Prescaler (Huff!) Oct 47 100- MHz Frequency Probe (Lashansky) Feb 3 1 Acoustic Fretd Generator (Templin) Jan 35,Feb 39 Add a Display So Your Protect (Avritch) Jun 59 p Jul 60 Audio Volume Limiler (Johnson) Mar 39 Benchtop Frequency Counler (Bergquist) Dec 33 Capacitance Adapter (Kohl) Apr 43 Christmas Card, The (Holrwarih) Dec 40 Digital Keyless Entry System (Avnlch) Mar 71 Digital Pressure Gauge (Cansti) Aug 41 Experimenters I/O Card (Hansiip) Jun 73 Generic Linear Powor c_ Supply Board (Wannamaker) Jun 41 > Ion Meter (Lovelock) Mar 35 Z LaserJet Memory Card (Green) Oct 55 C Lawn Ranger. The "> (Rafaels) Jun 31. Jul 45. Aug .15, Sep 53 3 Morse RTTY Detector (Ashworlh) Apr 33,May 49 " < NTSC— RGB Convener (Hamgfeld) Oct 59 -■ Phone-Activated £ Audio- Muting Circuit (Vaught) Jan 43 z. 6" o o H o UJ o □ < Port-A-Matio (GrcssWatt) Jan 81, Feb 75 Portable 146-MHz Quad Antenna (Robertson} Nov 41 Program mable Crystal -Controlled Pulse Generator (Lovelock) Jun 47 R»E's Digital Dashboard (Qrtman) Telephone-Line Controller (Saad) Jul 31 .Sep 61 Sep 37 Video Frame Grabber (Toner) Aug 31 Vocal Stripper (Weederj Sep 33 Radar Detector Tester (Ayer) Feb 37 Rocket Altimeter (Fleischer) Oct 37 Secure your Hard Disk with PC Access (Renlon) Apr 69 Semiconductor Laser System (lannini) Nov 34 Single-Chip Frequency Converter {Covington) Apr 49 Solid-State Disk Drive (Hatten) Jul 75,Aug 73 Wiper Control (Hail) Apr 46 Super- Directional Microphone (Blackwefli Jut 41 Telephone Call Scroener (Koller) Nov 49. Dec 52 Tnree-Chlp Logic Analyzer (fiobfnsori) Jan 41 Universal Descrambler (Graf & Sheets) May 37 Universal Laboratory Power Supply (Meu) Mar 31 VCR Head Amp Tester (Balhgale) Feb 51 Control circuitry ^Gros$blatt)(DB) Sep 83 Counter Presenter, 16-Hz (Hunt)(C) Oct 47 Crystal-controlled video timing generator. A {Grossblatth'OBj Feb 72 Cycolor printing secrets { Lancaster]^ HH) May 70 D DMM and Dwell Tach Meter, Jameco |ER) May 22 Dashboard, R-E's Digital [Ortman)(Ci Jul 31 Data Compression (Lancaster}(HH) Aug 67 Data Disks High-Speed Device Selection the 90s lor (Prestwood) Sep 47 Decoder. Morse, RTTY Detector (AshworthKC) Apr 33, May 49 Descrambler, Universal (Gral & Sheets)(C) May 37 Derive, Sot! Warehouse (Hotrzman)(EW) Jul 75 Deteclor. MorseHTTY (Ashworiti)(C) Apr 33, May 49 Digi-Compass (Nov'89) (LTR) Jan 16, Feb 14 DIGITAi amplification (ARE) Sep7 circuit simulation SUSIE (Byers) Dec 57 Dashboard, R-E's (Ortman)(C) Sep 61 Oscilloscopes. Inside (SloveriMay 44 Keyless Enlry System (AvrilcrtftC) Mar 71 Multimeter, and Dwell-Tach Meter, Jameco (ER) May 22 Beckman Industrial RMS225 (ER) Aug 16 Fluke 85 (ER) Apr 18 Micronta (ER) Dec 24 Pressure Gauge (Cansti)lC) Aug 41 .(PCS) Aug 65 thermometer (Lancaster) (HH) Oct 77 Discrete cosine transforms. and more (Lancaster)(HH) Dec 67 Disk Drive, Solid-Stale (Halten)iCi Jul 75,Aug 78 Display Add to Your Project (Avritch)(C) ot the Future? (Fenton) Jun 59. Jul 50 Feb 43 Today's graphics coprocessors (Mullinj(lCS) Nov 81 DOS on a motherboard (ARE) Feb 8 DRAWING BOARD (GrossblatlHDB) Jan 79,Feb 72, Apr 66, MayTt I.Jun 70,Jul 72, (LTR) Dec 16. Aug 1 8, Sop 6 3. Nov 83, Dec 78 Control circuitry Crystal-controlled video Sep 83 timing generator. A Feb 72 DTMF controller Nov 83 DTMF generator circuit Dec 78 Finally, a video signal! Jun 70 Lets plunge deeper into video Apr 66 Scrambling and Macrovision Jul 72,(LTR)Dec 18 Video-scrambling techniques Aug 18 Video-sync geneiatot World of video, the May 78 Jan 79 DTG Systems Sleuth 2,0 (HoltzmanHEW) Jun 73 DTMF controller (Grossblalt)(De) Nov S3 controller [ARE) Aug 12 generator circuit (Grc*ssbtatt)(DB) Dec 78 Dual-deck VCR (Lactieribruch)(Vr4) OcMO E EDTV (Lachenbruch)(VN) Jan 6 EGA to CGA Conversion (ARE) Oct 12 Echo PC 4 , Street Electronics Corps (Hottzman)(EW) May 81 EDITOR'S WORKBENCH (HoltzmanKD) Jan 81, Feb 75,Mar 71. May 81, Jun 73, Jul 75 Aug 73, (LTR) Dec 16, Jun 73 Feb 75 Mar 71 Jan 81 Aug 73 Apr 69 68000 News Announcement Bool (rom ROM Floppy Heaven Low-cost Logic Analyzer Personal computers and the lulure (Lachenbruch)(VN) Aug 6.Sep 4 vs. VHS-C (Lacbenbruch)(VN) Nov 6 ELECTRONIC C h nstmas Card. T he ( Holzwarth)(C) Dec 40 dice (LancaslerJ(HH) Nov 69 melody ch Ips (Lancaster)) H H ) Ju 1 62 controllers (Grossblatt){DB) Sep 83 levels (Lancasteri(HH) Jun 63 Workbench. Interactive Image Technologies Lab Simulation Program (Holtzrnan}(CC) Dec 86 Electrostatic Discharge (Hollander) Jan 54 Elenco's Micro-Master 8000 Compuief-Syslem Course (ER) Jan 22 Engineering simulator SUSIE (Byers) Dec 57 EQUIPMENT REPORTS (D) Jan 22,Feo 17,Mar 18 Apr IS.May 22. Jun IS.Jul IB Aug 15, Sep 16. Oct 20,Nov 24, Dec 24 Anaty* Powercaid PC-Controlled Power Supply Oct 20 Beckman Industrial FG2A Sweep'Function Generator RMS225 Professional DMM Computer-system course, Elencos Micro-Master Coordinated Time Link's, CTStO Computer Time Standard Digital multimeter and Dwell Tach Meier, Jameco Fluke 85 DMM Micronta DMM Elencos Micro-Master 8000 Computer-System Course Fluke 85 Digital Multimeier Hameg HM8C28 Spectrum Analyzer Handi-Counier UTC3O0O, Optoelectronics' Hewlett-Packard 48SX Scientific Calculator Huntron DC Line Sentry Integrity Electronics' lER-109 60-Hz Magnetic Field Meter Jameco Metex M-39Q0 DMM and Dwell'Tach Meter Wishmaker II Prototype Design Station H Logic Analyzer. PC-based. NCIs Field Meter, Integrity Micronta s Voice Meter DMM NCI's PA480 PC-Based Logic Analyzer Optoelectronics' UTC30O0 HandVCounler Oscilloscope. 2214 D A, Tektronix Portasol Butane-Gas- Powered Soldering Tool Kit Power Supply, Analyx Powercard Prototype design station. Jamecos Wishmaker II Scientific calculator, HP 48SX Soldering tool kit. Portasol Sony CRF-V21 Visual World-Band Receiver Speclrum analyzer module. Hamog HM8028 Sweep/Function Generator, Beckman Industrial FG2A Tektronix 2214 Digital Analog Oscilloscope Time Standard, Computer Voice Meter. Micronta Wishmaker II, Jameco World-Band receiver, visual. Sony CRF-V21 Etching lank (Dec'89) Experimenter's i o Card (Hanslip)(C) Maris Aug 16 Jan 22 Nov 24 May 22 Apr 18 Dec 24 Jan 22 Apr 18 Jan 22 Oct 20 Sep 16 Jun 18 May 22 May 22 Marts Jun 18 May 22 Dec 24 Jun 18 Oct 20 Jul 18 Apr 18 Oct 20 Maris Sep 16 Apr 18 Feb 17 Jan 22 Maris Jul 18 Nov 24 Dec 24 Maris Feb 17 (LTR) Apr 16 Jun 73,(LTR)Sep 12 Jul 56 (LTR) Jan 16 Jan 34, Feb 39 Jun 70 Apr 59 Jan 81 Apr 18 Readers' Letters Talking PC, The 8mm camcorders Jul 75 May 81 Fault-indicator alarms (Marslon) Fax- Male (Oct'89) Field Generator, Acooslic (TempimiiC) Finally, a video signal! (Grossbialt)fDB) Five-band equalizer circuit (LancaslerJ(HH) Floppy Heaven (HollzmanJjEW) Fluke 85 Digital Multimeter (ER) Forteis Audio FIX MIDI-compatlble stereo music scores (HoltzmanJ(CC) Oct 86 Fractals (Lancaster)(HH) Jan 61 Frequency Converter, Single-Chip (Coving(on)(C) Apr 49 Counter. Benchigp (Berggulsl)(C) Dec 33 Cou met Prescaler, 1 . 6-G Hz (Hufft ) (c I Oct47 Probe, 100-MHz. (Lashansky)(C) Feb 31 Fuel-level gauge R-E's Digital Dashboard (Ortman|(C) Jul 31, Sep 61 Future of shortwave broadcasting, The |Leinwoll)(SWR) Jan 73 Gauge, Digital Pressure (Carisli)(C) Aug 41 Generator Video-sync (Gross0lalt)(DB) May 78 Pulse Programmable Crystal-Controlled (Lovelock)(C) Jun 47 Generic Linear Power Supply Board ( Wannamaker) (C) Jun4l.(PCS)Jun69, (LTRJAug 14 Glitches in the Power Line (MigliorB)Apr 39 Graph-m-lhe Box. New England Software (Holtzman)(EW) May 81 Graphics coprocessors. Today's (Mullrn)(ICS) Nov 81 HDTV (Lachenbtuch)(VN) Mar 6. May 6 Hall-effect resources (LancasterJ(HH) May 70 Hameg HM8028 Spectrum Analyzer Module(ER) Jan 22 Handi-Counter UTC3000, Optoelectronicsi ER) Oct 20 Hard disks (ARE) Apr 12 Hard-disk controller (ARE) Deo 8 H A R DWARE HACKE R (Lancaster*; D) Jan 61. (LTR)May 14,Feb 67, Mar 58, Apr 59, May 70. Jun 63. Jut 62, Aug 67, Sep 75, Oct 77, Nov 69. Dec 67 Alternate-energy resources Apr $& Chaos science resources Jan 61 Cold-fusion papers and more Feb 67 Cycolor printing secrets May 70 Data Compression Aug 67 Discrete cosine transforms Dec 67 Low-cost memory Jun 63 Perpetual motion, and the magnetocaloric effect Sep 75 Power-conlrol fundamentals Jul 52 Synchronous demodulation Mar 58 Various filters and a digital thermometer Oct 77 Walking-iing counters and more Nov 69 HARDWARE REVIEWS Audio F/X. Forte's (Hofeman)(CC) Oct 86 CompaliCard IV. Microsolutlons (Holtzman)(EW) Jan 81 Echo PC *■ , Street Electronics Coras (Hci!zroan)(EW) May 81 (E}EPROM programmer. JDR's (HollzmanJIEWi Feb 75 Forte's Audio FX MIDI-compatib-le package (Holtzman)(CC) Oct 86 JDR Mrorodevlces' (E)EPROM Modular IC-programming system (HoHzman)(EW) Feb 75 LAI Logic Analyzer, Photronlcs' (Hottzman)(EW) Aug 73 Microsolutlons' Compaiicard IV (Holtzmanl(EW) Jan 61 Photronics' LAI Logic Analyzer (Roltzman)(EW) Aug 73 Sealevel Systems' Universal Memory Card (Hofcman)(EW) Street Electronics Corp.5 Echo PC + (Ho1teman)(EW) Texas Instruments' RS-232 line driver and receiver(Holtzman)(EW) Universal Memory Card, Sealevel Systems' (Holbmani(EW) Hazardous-mafenal disposal Hearing-aid design, progress in hi-fi (KleinJ(AUD) Heath's AD-2550 Surround-Sound Processor (ER) Jun 57 Hewlett-Packard 48SX Scientific Calculator(ER) Sep 16 High -End Hi-Fi Show, The (Klein)(AUD) Home-Security Cookbook (Marston)May 61 Huffman codes (Lancaster) (HH) Huntron DC Line Sentry Voltage Monitor) ER) Mar 71 May 81 Feb 75 Mar 71 Apr 59 Feb 24 Aug 81 Aug 67 Jun 18 iC SPOTLIGHT (Mullln)(D) Power Processing and nol-so-dynamic memory Today's graphics coprocessors IC's Audio Amplifier (Marston) Power Amp, Working With (Marslon) Pre- Amp (Marslon) Intel's i860 (Mullin)riCSi Removal of (ARE) I O Card, Experimenler's (Hanslip)(C) IR Remote Extender (May"89) Impedance measurements Test Methods (Rogatski) Dec 66 Nov 81 Apr 53 Mar 52 Feb 54 Nov 81 MarS Jun 73 (LTR) Jan 16 Mar 21 Inside Digital Oscilloscopes (Stover) May 44,(LTR)Aug 14 Wei's i860 iMullinirlCSi Integrity Electronics IER-109 60-Hz Magnetic Field Meter (ER) Interactive image Technologies' Electronics Workbench Program (Holtzman)(CC) Laserdiscs (LachenbruchKVN) Video (Lachenbruch)(VN) Introduction to Microwave Technology (Carr) Ion Meter (Lovelock)(C) Nov 31 May 22 Dec 86 Dec 6 Mai 6.JUI 6 Is sound quality a matter of taste? (Klain)(AUD) Aug 60,Sep 66, Oct 71 Mar 35,(PCS)Mar 57, (LTR)Jun 12,(LTR)Nov 16 Apr 64 JDR Microdevices' (E)EPROM Programmer system (HoltzmanJ(EW) Feb 75 Jameco Electronics' Metex M-3SO0 DMM and Dwell Tach meter (ER) May 22 Wishmaker II Prototype Design Station (ER) Mar 18 62 Plug a Friend into Radio-Electronics this Christmas ... and Save $19.43! This Christmas give an electrifying gift ... plug a friend into Radio-Electronics and brighten his whole new year! Whether electronics is his livelihood or his hobby, your gift will sharpen his focus and illuminate the whole spectrum of electronics throughout the coming year. Radio-Electronics will keep him informed and up-to-date with new ideas and innovations in all areas of electronic technology ... computers, video, radio, stereo, solid state technology, satellite TV, industrial and medical electronics, communications, robotics, and much, much more. 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In coming issues, Radio-Electronics will present practical, educational, and money- saving projects like: a helium-neon laser ... a lighting controller ... a video timebase corrector ... a video noise processor ... a light-beam communicator ... an antenna amplifier ... and many others! No need to send money ... if you prefer, we'll hold the bill till January, 1991. But you must rush the attached Gift Certificate to us to allow time to process your order and send a handsome gift announcement card, signed with your name, in time for Christmas. So do it now . . . take just a moment to fill in the names of a friend or two and mail the Gift Certificate to us in its attached, postage- paid reply envelope. That's all it takes to plug your friends into a whole year of exciting projects and new ideas in Radio- Electronics! ♦Basic sub rate— 1 >r/S17.97 2 yr/$34.97 6! K-Talk Communications' MalhEdil (HoltzmanKEW) Apr 69 Keyless Entry System. Digital (Avriich)(C) Mar 71 KIT REPORT Heath's AD-2550 Surround-Sound Processor (KR) Jun 57 LA1 Logic Analyzer. Fhotronics (Holttman)(EW) Ayg 73 LCD projectors (LachenbruchKVN) Mar 6 screens (LaEhenbiuchKVN) Jan 6 (LaciienbmehJ(VN) Jul 6, Sep 6 Interactive (Lachenbruch}(VN) dec 6 Laser System. Semiconductor (lannini)(C) Nov 34 LaserJet Memory Card (Green )(C) Oct 5S Laser Wnior techical information (Lancaster)(HH) Jun 63 Lawn Ranger. The (Rafaels)(C) Jun 31,Jul 45, Aug 45, Sep 53 Leading Edge's PC-compatible computer(ARE) Apr 12 Let's plunge deeper into video (Grossblatt)(DB) Apr 66 LETTE R S (0) Jan 16, Feb 1 4, M a r 14, Ap r 16 May 14,Jun 12, Jul H.Aug 14 Sep 12,Oct 14,Nov 16,Deo 16 Linear Power Supply Board. Generic (Wannamaker)(CJ Jun 41 Unear voltage differential (Lancaster HHH) Mar 53 Lines of resolution (ARE) Jun S Listening tests (Klein)(AUO) Nov 85 Logic Analyzer low-cost (HoltzmanKEW) Aug 73 PC-based, NCI (ER) Jun IS 3-Chip (Robinson)(C) Jan 41 Low-cost Logic Analyzer (Holtzman)(EW| Aug 73 memory ( Lancaster) (HH) Jun 63 Low-noise amplifiers (Lancaster)(HH) May 70 Low-tcmperatature alloys (Lancasier)IHH) Apr 59 Jul 31, Sep 61 Oct 47 O z O LX r- o UJ o o < EC M Macrovlsion. Scrambling and (Grossblati)(DBj Jul 72 Magnetic Field Meier, Integrity Electronics' (ER) May 22 refrigeration (LancasterK H M) Sep 75 , Nov 69 Magnetron tubes introduction to Microwave Technology (CarrJ Oct 71 Make Your Own Etching Tank (Dec'89) (LTR)Mar 14 Manifest. Quarterdeck Office Systems' (Holtzman)(EW) Jun 73 MathCAD . MathSoft ( Ho1tzman)(E W I M ay 81 MalhEdiL K-Talk Communications (Hoilzman)(EW) Apr 69 Matter, new lorm ot (Lancaster)(HH) Jun 63 Measurement, AC Power (Trietley) Aug 51 Mechanical devices. Unusual (Lancaster)(HH) May 70 Memory expansion board LaserJet Memory Card (Green)(C) Oct 55 Microphone. Super-Directional (BlackwellKO Jul 41 Micropoiis Corp 1654-7 ESDI PC-Pak (Hol!zman)(CC) Nov 86 Microsoft Windows 3.0 (Hollzman)(CC) Sep 88 Word (HoltzmanKEW) May 81 Microsolutlons Compaticard IV (Holtzman)(EW) Jan 81 Microwave Technology. Introduction to (Cart) Aug 60, Sep 68 Oct 71,(LTRiNov 16 MIDI-compatible stereo music scores (Holteman)(CC) Oct 86 Model rocketry Rocket Altimeter (FleischerKQ Oct 37 Modular IC -programming system (HoltzmanKEW) Feb 75 Morse- RTTY Detector (Ashworth)(C) Apr 33 (C)May 49,(PCS)May 66 Micronla's Voice Meter DMM (ER) Oeo 24 N Jun 16 (LTR)Jan 16 Oct 59 Jun 8 NCI PA480 PC-Based Logic Analyzer(ER) NTSC - PAL VCR conversion -RGB Converter (Harrigfeld)IC) standard (ARE) National Semiconductor LM3BX Audio Pre-Amp ICs (Mars ton) Feb 54 Nalionai Sound Preference? (K!ein)(AUD) Mar 77 N E W LIT ( O) Feb 23,Ma r 26, A pr 30 .May 33 Jul 2 5, Aug 24. Sep 2 6.0c ! 30 Nov 26. Doc 30 Oil-pressure gauge R-E's Digital Dashboard (OrlmanJ(C) 1.6-GHz Counter Prescaler (HufflHC) 100-MHz Frequency Probe [ Lashansky)(C) Feb 31 ,( PC S)Fe b 59 Optoelectronics UTC3000 Hand i-Cou nter | E R ) Oct zc Organic vapor detectors (Lancaster) (HH) Apr 59 Oscilloscope. Tektronix 2214 D'A (ER) Jul 18 Oscilloscopes. Inside Digital (Stover) May 44 Oct 77 Apr 69 Feb 67 Feb 14.Mar 14 Mar 14 Nov 14 Apr 12 NEW PRODUCTS (D) Nintendo car adapter (ARE) Jan 26,Feb 20,Mar 22,Apr 22 May 24. Jun 22, Jul 21. Aug 20 Sep 2 2. Oct 22. Nov 26, Dec 26 MarS Passive tillers (Lancaster) (HH) PC Access, Secure ¥our Hard Disk with (Rentonl(C) PC boards making (LaneasterKHH) (LTR) supplies (LTR) washing (ARE) PC-compatible computer Leading Edge (ARE) PC vision system R-E's Video Frame Grabber (Toner)(C) Aug 31 PC SERVICE (D) Feb 59, Mar 57, May 57, Jun 69 Peripheral Technology's PT-68K2 (Hoitzmanl(EW) Jun 73 Perpetual motion, and Ihe magrtetocaloric eflecl (Lancaster) (HH) Sep 75 Personal computers and the future (Hoitzman)(EW) Apr 69 Personics UltraViston 2.0 (Hoitzman)(CC) Oct 86 Phone-Activated Audio-Muting Circuit (Vaughl)(C) Jan 43 Photronics LAI Logic Analyzer (HoltzmanKEW I Aug 73 Port-A-Matic (Grossblatt)(C) Jan 81, Feb 75,(PCS)Feb 81 Portable 146-MHz Quad Antenna (RobertsonJ(C) Nov 41 Portasol Butane -Gas-Powered Soldering Tool Kit (ER) Apr 18 PostScript direct toner kits (Lancaster)(HH) Feb 67 Power Line, Glitches in (Migliore) Apr 39 Power Supply, Analyx Powercard (ERI Oct 20 Generic Linear Power Supply (Wannamaker)(C) Jun 41 Univeral Laboratory (Metz)(C) Mar 31 Power Processing and not-so-dynamic memory (Mullin)(ICS) Dec 66 Power-control fundamentals (LaneasterKHH) Jul 62 Pressure Gauge, Digital (Caristi)(C) Aug 41 Prinled-circuii standard [LaneasterKHH) Jul 62 Priming resources (Lancaster)(HH) Mar 56 Private Eye, Reflection Technotogys Display of the Future? (Fenton) Feb 43 Probe, 100-MHz Frequency (LashanskyJjC) Feb 31 Program SPICE (Byers) Nov 63 SUSIE (Byers) Dec 57 Programmable analog inverter (Lancaster)(HH) Mar 58 Crystal-Controlled Pulse Generator (LovelockJ(C) Jun 47,(PCS)Jun 69 Progress in hi-fi hearing-aid design (Klein)(AUD) Feb 24 PromKit . Annabooks ( Ho1tzman)( EW) Mar 71 Prototype design station, Jamecos Wlshmaker II (ER) Mar 16 Pulse Generator. Programmable Crystal-Controlled (Lovelock l(C ) J un 47.(PCS) Ju n 69 Quad Antenna. Portable 146-MHz (Robertson)(C) Nov 41 Quarterdeck Office Systems' Manifest ( HoltzmanKEW) Jun 73 RAM disk, battery-backed Solid-State Disk Drive I Hatten ) (C) Ju I 75, Aug 73 R-E's Digital Dashboard (Ortman}(C) Jul 31, Sep 61 Telephone-Line Controller (Saad)(C) Sep 37 Video Frame Grabber (Toner)(C) Aug 31 Vocal Stripper (Weedsr)(C) Sep 33 Radar Detector Tester (Ayer)(C) Feb 37,(PCS) Feb 59 RADIO Future of shortwave broadcasting, The(Leinwotl)(SWR) Jan 73 Morse RTTY Detector (Ashwonh)(C) May 49 Rock, Religion, and Rhetoric (Dexter) Jul 53 Sony CRF-V21 Visual World-Band Receiver Feb 17 Whatever Happened to AM Radio? (Dexter) Sep 71 Radiotetetype MorseRTTY Detector (Ashworth)(C> Apr 33,May 49 READER-HELP-REAOER (D) Apr 21,Jun 89 Readers' Letters (Holtzmanl(EW) Jul 75 Receivers vs. separate components (Klem)(AUD) Jun 72 Recording ba!ance(Klein)(AUD) Jan71 Reflected speaker sound ( Klein) (AUD) Jan 71 Reflection Technology's Private Eye Display of the Future? (Fenion) Feb 43 Research, Independent (LaneasterKHH) Sep 75 Resistance standard (LTR) Dec 16 Robotics Lawn Ranqer, The (Rataels)(Cl Jun 31,Jul 45 Aug 45. Sep 53 Rock. Religion, and Rhetoric (Dexter) Jul 63 Rocket Altimeter (Fleischer)(C) Oct 37 Run-lenglh encoding (Lancaster) (HH) Aug 67 SAP Second Audio Program(Lachenbruch)(VN) Feb 6 SCR's (ARE) Ju! 8 SCS I ESDI shaatoul (Hoftzman) (CC) Nov86 Santa Claus machine (l_ancaster)(HH) Dec 67 Satellite TV. The Changing Face of (Angus) Nov 58 Scientific calculator, HP48SXIER) Sep 16 Scrambling and Macrovision (Grossblattl(DB) Jul 72 Sealevel Systems Universal Memory Card (Hollzman)(EW) Mar 71 Search tot the perfect tweeter. The (Kleinj(AUD) May 76 Secure your Hard Disk with PC Access (Renton)(C) Apr 69 Security -Circuil Cookbook (Marston) Jul 56 Digital Keyless Erilry System (Avritah)(C) Mar 71 Home-Security Cookbook (Marston) May 61 SemiconductorLaserSystem(lannini)fC) Nov 34 Servicing TV Service Case Histories (Zymaris) Oct 67 Shortwave Radio Future of ( Leinwol I ) (S WR ) Jan 73 Rock. Religion, and Rhetoric (Dexter) Jul 53 Single-Chip Frequency Converter (Covington)(C) Apr 49 68000 News (HoltzmanKEW) Jun 73 Sky Cable ( Laeh e nbruch )( VN ) J un 6 Slick! drawing management system (Grossblatt)(EW) Jan 81 Soldering tool kit. Portasol (ER) Apr 18 Soft Warehouse's Derive (HoltzmanKEW) Jul 75 Software Data Disks: High-Speed Device Selection for the 90s (Prestwood) Sep 47 Floppy Heaven (Ho!tzman)(EW) Jan 61 SOFTWARE REVIEWS Asymetrix ToolBook 1 . ( Hollzman)(CC J SepSB Audio F X. Forte's (Hollzman)ICC) Oct 86 Annabooks' PromKit (Holtzman)(EW) Mar 71 CAD Systems Untimited's Slick! (HoltzmanKEW) Jan 61 Derive, Soft Warehouse's (Hoflzman)(EW) E!oclromc Workbench. Interactive Image Technologies: (Hol(zman)(CC) Forte's Audio FIX MIDI-compatible package (Holtzman)(CC) Graph -In -the Box, New England Software's ( HoltzmanK E W) May 81 K-Talk Communicalions' MathEdil (Hoftzman)(EW) Apr 69 MathCAD, MalhSofts (Hotfzman)(EW) May 81 Micropoiis Corp.'s 1654-7 ESDI PC-Pak (Holtzman)(CC) Nov 86 Microsoft Windows 3.0 (Hollzman)(CC) Sep 88 Word (HoltzmanKEW) May 81 Personics Ultra Vision 2 . f Hoilz man)(CC ) Oct 86 PromKrl, Annabooks (Holfemen)(EW) Mar 71 Slick! drawing management system (Hollzman)(£W) Jan 81 Solt Warehouses Derive (HoltzmanJ(EW) Jul 75 Sport serial port set-up, Western Hydraulic Systems' (Hollzman)(EW) Aug 73 ToolBook. Asymetrix's (Holtzman)(CC) Sep 88 UltraVision 2.0. Personics (Hottzman)(CC) Oct 86 Western Hydrokxjic Systems' sPORTI serial port setup(Holtzman)lFW) Aug 73 Windows 3.0. Microsoft (Holtzman)tCC) Sep 88 Word, Microsoft (HoltzmanKEW) May 81 So! Id-State Disk Drive (Hatten)(C) Jul 7S,Aug 73,(PCS)Aug 65 Wiper Control (Heilj(C) Apr 46.(LTR)May 14 Sony CRF-V21 Visual World-Band Receiver (ER) Feb 17 Sound of Audio The: AES conference report (Klein)iAUO) Sep Bl.Oet 84 Speakers Search for the perfect tweeter (K!ein)(AUD) May 76 Spectrum analyzer module. Hameg HM8028 (ER) Jan 22 SPICE (Byers) Nov 63 Split battery supply (ARE) Nov 14 sPORTt, Western Hydrologic Systems' (HoltzmanKEW) Aug 73 Stereo Silencer Phone-Activated Audio-Muting Circuit (Vaught)(C) Jan 43 -system imbalance (Klein) (AUD) Feb 24 -TV (Lachenbruch)(VN) Jun 6 Jul 75 Dec 86 Oct 86 66 Street Electronics Corp.s Echo PC ■ (Holtzman)(EW) May B1 Super-Directional Microphone (Blackwell)(C) Jul 41 Surround Sound All Aboul (Bernard) Jun 51 decoder Acoustic Field Generator (Templin)(C) Jan 35 processor, Heaths AD-2550 (KR) VCR Ask RE |ARE| Jun 57 Oct 12 SUSIE (Byers) Dec 57 Sweep' Function Generator Beckman Industrial FG2A (EH) Mar 1a Sync regenerator Universal Descrambler (Graf & Stieets ) i C ] May 37 Synchronous demodulation (Lancaster)(HH) Mar SB System Sleuth 2.0, DTG's (Holtzmanl(EW) Jun 73 Three-Chip Logic Analyzer (Robinsonj(C) Time Standard, computer (ER) Todays graphics coprocessors (Mullin)(ICS) ToolBook . Asymetrix's (Hollzman)(CC) Touch-tone decoder (ARE) Transistors, Why Are There So Many? (Bernard) Trade journals (Lancaster )(HH) Transputers, second-generation (Mulhn)(ICS) Triacs, Telling SCRs from (ARE) Troubleshooting Potentiometers Tesl Methods (Rogalski) Tweeter, The search for Itie perfect (Klein}(AUD) 2N2222 AND gate (ARE) Jan 12 TV (See also Teteviston, Video) screen captions (Laehenbruch)(VN) Service Case Histories (Zymaiis} -VCR combos (Lachenbruchl(VN) TVRO (VN) Jan 41 Nov 24 Nov 81 Sep 88 Jul a May 53 Nov 69 Dec 66 Jul 6 Mar 21 May 76 Nov 6 Oct 67 Apr 6 Sep 4 a crystal-controlled (GrossblattHDB) Feb 72 Universal Descramblor (Graf A Sheeis)(C| May 37,(PCS)May 66,(LTRUun 12 Mays Upgrade (ARE) VCR Head Amp Tester (Bathgate)(C) VIDEO NEWS (0) Feb S1,(PCS)Feb 59 Jan 6. Feb 6, Mar 6, Apr 6 May 6 Jun 6, Jul G.Aug 6 Sep 6,Oct 1 0.Nov 6, Dec 6 Visible-light laser diodes Semiconductor Laser System (lanninl)(C) Vocal Stripper. R-ES (Weeder)(C) Voice Meter. Micronta (ER) Voltage converter (ARE) gauge R-E's Digital Dashboard (Orlman)(C) Monitor, Huntrol DC Line Sentry (ER) readout (ARE) VOR Generalor (ARE) Vortex coolers (LancasterJ(HH) Nov 34 Sep 33 Doc 24 DocB Jul 31 .Sep 61 Jun 18 Mays Aug 12 Nov 69 Taking care ol your tapes (Klein)(AUD) Jul 69 Talking PC. The (Holt2man)(EW) May 81 Technical literature (See NEW LIT. HARDWARE HACKER] Tektronix 2214 Digital Analog Oscil loscope ( ER) Ju 1 1 8 Telephone -Activated Audio-Musing Circuit (VaughlKC) Call Screener |Kollet)(C| -Line Controller (Saadl(C) ringer (ARE) Television (See also TV, Video) Changing Face ol Satellite TV. The (Angus) Ten-speed blender control [Lancaster )(HH) Test Equipment (See also EQUIPMENT REPORTS) Benchlop Frequency Counter (Bergquist)(C) Dec 33 Capacitance Adapter (Kotill(C) Choosing the Right Test Probe (Hansen) Inside Digital Oscilloscopes (Stover) 1.6-GHi Counter Prescaler (Huf1t)(C) 100-MHz Frequency Probe' (Lashansky)(C) Programmable Crystal-Controlled Pulse Generalor (Lovelock)(Q Jun 47 Rada/ Oeteclor Tester (Ayer)(C) Feb 37 Three-Chip Logic Analyzer (Roblnson)(C) Jan 41 Jan 43,(LTR)Jul 14 Nov 49 .Dec 52 Sep 37,(LTR)Oel 14 Jul 8 video Nov 58 Jul 62 Apr 43 Dec 63 May 44 Oct 47 Feb 31 Test Methods (Rogalski) Test Probe, Choosing the Right (Hansen) Tester Radar Detector (A_yer)(C) VCR Head Amp (BalhgaleMC) Waveform Processing with your PC (Ramirez) Test Methods (Rogalski) Test Probe, Choosing the Right (Hansen) Texas Instruments RS-232 driver and received Holtzmant(EW) TMS34QXX.TMS320XX (Mullin)(ICS) Thermoelectric coolers (Lancaster)(HH) Mar 21,(LTR)May 14 Dec 63 Feb 37 Feb 51 May 81 Mar 21,(LTR)May 14 Dec 63 Feb 75 Nov 81 Jan 61 u Ultra-violet llaime detector (Lancaster)(HH) Apr 59 UitraVision 2.0, Personlcs [Holtzman)(CC) Oct 66 Universal Descrambler (Gral & Sheets) (C) May 37 Laboratory Power Supply (Melz)lC') Mar 31 ,(PCS)Mar 57 Memory Card. Sealevef Systems (Hotanan)(EW) Mar 71 Vacuum gauge R-E's Digital Dashboard (Ortman)(C) Various (illefs and a digital thermometer (Lancaster)(HH) VCR Head Amp Tester (Bathgate)(C) programming eides (Lacbenbruch)(VN) VGA to CGA displays (ARE) VHS-C (Lachenbruch)(VN) Video (See also Television, TV, VIDEO NEWS) compression (Lancasler)(HH) DTMF controller (Grossblatl)(DB) Finally, a video signal ( (Grossblat1)[DB) Frame Grabber, R-Es froner)(C) Jul 31, Sep 61 Oct 77 Feb 51 Oct 10 Jul a Feb 6 Dec 67 Nov 83 Jun 70 Aug 31 Let's plunge deeper Into video (Grossblatt)(D8) Apr 66 line drivers (LancasterJ(HH) Aug 67 Scrambling and Macrovision (GrossblattHDB) Jul 72 -scrambling techniques (GrossblattHDB) Aug 16 -sync generalor (Grossblattj(DB) May 78 Tapes, Taking care of your (Klein)(AUD) Jul 69 The world ol (Grossblalt)( DB) Jan 79 timing generalor, w Walking-ring counlets and more (Lancasterl(HH) Nov 69 Water -pressure gauge R-Es Digital Dashboard (Ortman)(C) -temperature gauge - laTC ' Sep 61 Jul 31 May 61 R-Es Digital Dashboard (Ortman)(C) Waveform Processing with your PC (Ramirez) Western Hydrologic Systems' sPORTt (Holtzman)(EW) Aug 73 Whatever Happened to AM Radio? 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UU irSbi, mnmsm • Resolution: 640 X 430. ■ Analog input signal. - Tilt swivel base. $ 99 1999 Item No. B-2500-160159 Insured Ship/Hand.: $49.00 FOR FASTEST SERVICE CALL TOLL FREE 1-800-729-9000 DAMARK IMTERNATIONAL, INC. 7101 Wmw&a Avff. tt, Minneapolis. MN 55428-1619 Customer Service 61 2-K3 1 -00&2 Please rush me: KLH 386-25 computer(s) @ 51999.99 each, plus 549.00 vh each. Item No B-2500-160159 MN res. add 6% sales lax. City.5tate.zip . D Clwdt'MO D VISA □ MastBf Card □ Diseovar Card No Exp C-a!e_ ^_ - Pti. I ( u SiflrsatufS Copyright t9&0 DAUARK International.. Inc. AH fighrts reserved. DELIVERY TO 48 U.S. STATES ONLY NAMES AND NUMBERS Bourns, Inc. 1200 Columbia Avenue Riverside, CA 92507 (714) 781-5500 CIRCLE 301 ON FREE INFORMATION CARD Electronic Buyers News 600 Community Drive Manhasset, NY 11030 (516) 562-5000 CIRCLE 302 ON FREE INFORMATION CARD Electronic News Box 1051 Southeastern, PA 19398 (215) 630-0951 CIRCLE 303 ON FREE INFORMATION CARD ELTEC Instruments Inc. Box 9610 Daytona Beach, FL 32020 (800) 874-7780 CIRCLE 304 ON FREE INFORMATION CARD GEnie 401 North Washington Street Rockville, MD 20850 (800) 638-9636 CIRCLE 305 ON FREE INFORMATION CARD International CMOS Technology 2125 Lundy Avenue San Jose, CA 95131 (408) 434-0678 CIRCLE 306 ON FREE INFORMATION CARD The ear is logarithmic, allowing it to deal with everything from a whisper to a shout over an incredible dynamic range. And since radio began with audio, it is convenient to employ log systems to describe the differences between powerful transmitted sig- nals and weak received ones. All of which leads us around to decibels. Decibels are simply one convenient way of measuring things on a log scale with a potentially wide dynamic range. Since you'll usually measure voltage rather than power, most hackers typically use voltage decibels rather than the much rarer power ones. A reading of so many decibels tells you the relative strength between two quantities. For instance, a one-deci- bel change is about a ten-percent change in amplitude. It is also roughly the smallest amplitude change you can usually pick up with your ear. Journal of Electroanalytical Chem. Box 564, 1001 Lausanne 1 Switzerland (021) 20 73 81 CIRCLE 307 ON FREE INFORMATION CARD Model Railroader Box 1612 Waukesha, Wl 53187 (414) 796-8776 CIRCLE 308 ON FREE INFORMATION CARD Radio Control Modeler Box 487 Sierra Madre, CA 91024 (800) 523-1736 CIRCLE 309 ON FREE INFORMATION CARD Samsung 3725 North First Street San Jose, CA 95134 (408) 434-5400 CIRCLE 310 ON FREE INFORMATION CARD Synergetics Box 809 Thatcher, AZ 85552 (602) 428-4073 CIRCLE 311 ON FREE INFORMATION CARD Texas Instruments PO Box 809066 Dallas, TX 75380 (800) 232-3200 CIRCLE 312 ON FREE INFORMATION CARD A two-decibel change is around twenty percent, and a three-decibel change is around thirty percent. More specifically, when one signal is at a - 3-decibel level from another (or "three dB down"), you will be at 0.707 relative amplitude. Now, since power is related to the square of your circuit voltage, and since 0.707 squared is 0.5, being three decibels down is also at half power from whatever your 0-decibel level happened to be. Hi-fi components normally have their frequency responses specified between their upper and lower -3- dB points. Put another way. this is the range over which the available power remains over half of what you would get in the "middle" of whatever fre- quency range you're measuring. Moving right along, a ten-decibel change is roughly a 3:1 amplitude ratio, twelve decibels is one quarter, 70 60 Decibels is 40 Decibels is 20 Decibels is 18 Decibels is 12 Decibels is 10 Decibels is 6 Decibels is a 1000:1 amplitude gain, a 100:1 amplitude gain, a 10:1 amplitude gain. an 8:1 amplitude gain. an 4:1 amplitude gain, roughly a 3:1 gain, a 2:1 gain. 3 Decibels is about a 30 percent gain and the double power point. 2 Decibels is a 20 percent amplitude gain 1 Decibels is a 10 percent amplitude gain. Decibels is a unity amplitude ratio of 1:1. -1 Decibels is -2 Decibels is a 10 percent drop, a 20 percent drop. -3 Decibels is about a 30 percent drop and the half power point. -6 Decibels is half amplitude. -10 Decibels is around one-third amplitude. -12 Decibels is quarter amplitude, -18 Decibels is eighth amplitude. -20 -40 -60 Decibels is Decibels is Decibels is a 10:1 attenuation, a 100:1 attenuation, a 1000:1 attenuation. FIG. 2— SOME SIMPLE RULES that make learning how to use decibels much easier. eighteen decibels is one eighth, and twenty decibels equals one tenth. One hundredth is forty decibels, and one thousandth is sixty decibels. The 143-decibel phase detector asked for above is the ratio between one micro- volt and fourteen volts, an almost im- possible dynamic range to deal with gracefully at reasonable cost in the real world. I've gathered some of these "rule of thumb" decibel ratios into Fig. 2 for your reference. Once again, almost all your decibel measurements are relative and will always refer to two different levels in two points in your circuit. Decibels usually answer the question "How strong is the present signal or re- sponse compared to another one?" How strong is a six-decibel signal? Somewhere between a femtowatt and a gigawatt, at least sometimes. Maybe. It all depends. All we know for sure is that this particular signal is twice as strong in amplitude as some other one at some other time or 0+12V 1 k ltyp> BIGHT 10K 51 K ; AUDIO o— j INPUT . , 4,7fi LEFT 4.7y. AUDIO o-|(— WA-A-WrA-^f INPUT 10K 51K FIG. 3— A STEREO AUDIO-LEVEL METER using the Samsung KAA2231. Levels displayed are -16, -11, -6, -3, and decibels. Input sensitivity is one millivolt. DISCOVER EXPERIMENT LEARN ADVANCE ELECTRONICS LASERS CAD-CAM HOME STUDY HEATHKIT HOMEWORKS! Now you can learn Ixiginning to advanced electronics at home, with the same courses used today in the world's top colleges and tech schools, and pay a lot less! You'll learn just what you want, when you want, at your own pace.The complete story is in our free catalog, Homeworks by Heathkit. Order yours today, call toll-free: 1-800-44-HEATH (1-800-444-3284) ^orks IYES! Please send me a I'RIili copy of.che Homc-Works by Heaihkil GiuiIor. | Send to: Ho-.ilh Company. Depl. 020-014 Elenion 1 hither, Michigan 49022 J Name i Addn'ss [City ! Sate Zip BX>2K Bull Datt Systems, Inc. > c > -< CIRCLE 86 ON FREE INFORMATION CARD - 1 71 DIGITAL VIDEO STABILIZER ELIMINATES ALL VIDEO COPY PROTECTIONS While watching rental movies, you will nolle* an- paying periodic color darkening, color shift, un- wanted Itnes, flashing or jagged edges. This is caused by the copy protec- tion Jamming signals em- bedded in the video tape, such as Macfovision copy protection. Digital Video Slabiliier: RXII completely eliminates all copy protec- tions and jamming signals and brings you crystal clear pictures, FEATURES: • Easy to use and a snap to install *>Sta1e-of-the-art in- tegrated circuit lechnol- • 100% automatic - no need for any troublesome adjust- ments •Compatible to all types of VCRs and TVs •The best and most excil- ing Video Stabilizer In the market • Ught weight {bounces) and Compact (1x3,5x5^) • Beautiful deluxe gift box • Uses a standard 9 Volt battery which will last t- £ years. WARNING : SCO Electronics and RXII dealers do not encourage people to use the Digital Video Stabilizer to duplicate rental movies or copyrighted video tapes. RXII is in- tended to stabi- lize and restore crystal clear picture quality for private home use only. ( Dealers Welcome ) ToOrdeC: $49,95 ea + $4 for FAST UPS SHIPPING 1-800-445-9285 or 516-568-9850 Visa, M/C, COD M-F: 9-6 (battery rtol included) SCO ELECTRONICS INC. Dept. cheoi 581 W. Merrick Rd. Valley Stream NY 11680 Unconditional 30 days Money Back Guarantee CIRCLE 190 ON FREE INFORMATION CARD HowYc ■;. oWtll 72 1 Unit 10 Lot Jerrotd SB w/Triraode... 199 170 ,.„_.,, ... ... Super Tri-Mode $10»....$75 US Cable will Oal KN12 (w/vs) ..S109...J65 Beat Anyone's Scientific Atlanta S109....I7S p_jX» SA (Combo) K50....$195 , , r " ce , , Pioneer. — _ J109....J79 Advertised in Hamlin MLD 120ft S8*„....S59 this Magazine! Tocom S1*9....J129 ■ ~ Startle converter S95 S75 Panasonic converter...... S99. S79 30 Days Money Back Guarantee Free 16 page Catalog Visa, M/C, COD or send money order to: US Cable TV Inc. Dept.KREoi 4100 N.Powerline Rd., Suile F-4 Pompo no Bench, FL 33073 1-800-445-9285 For Our Record I, Lhe undersigned, do hereby declare under penalty of per- jury that all products purchased, now and in the future, will onty be used on Cable TV systems witipropcr authorization from local officials or cable company officials in accordance with all applicable federal and slate laws. FEDERAL AND VARIOUS STATE LAWS PROVIOE FOR SUBSTANTIAL CRIMINAL AND CIVIL PENALTIES FOR UNAUTHORIZED USE. Date: Signed: No Florida Sales! CIRCLE 191 ON FREE INFORMATION CARD + 12VO- AUDIO INPUT .? 0.4?n. 10K 12K y 4.7p. 4.7u HHtVAr-UWr 10K 4-12V 39K 3.47JJ. *" K (iyp) + (g)(g)(3)(3)(|)(|)(g)(g)(g)(|) FIG. 4— A MONO AUDIO-LEVEL METER can be built by using both halves of the Samsung KAA2283. Levels displayed are -18, -16, -14, -12, -10, -8, -6, -4, -2 and decibels. Sensitivity is from 0.1 to 0.9 millivolts. Electrochemically induced nuclear fusion of deturium. Ffeishmann. Pons. Hawkins, vol 261 pp 301 -308. Examination of nuclear measurements in cold fusion experiments. Abriola, et.al, vol 265 pp 355-360. Observations of the surface composition of palladium cathodes after electrolysis. Mebrahtu, et.al, vol 267 pp 351-357, Electrochemical incorporation of lithium into palladium from aprotic electrolytes. Dalard, et.al, vol 270 pp 445-450. Production of tritium from electrolysis at a palladium cathode. Packtiam, et.al, vol 270 pp 451-458. A long-term calorimetric study or electrolysis using palladium cube cathodes. Armstrong, et.al. vol 272 pp 293-297. Tritium production during the cathodic discharge of deuterium on palladium Chene, et.al, vol 280 pp 199-205. Electrochemical fusion: a mechanism speculation. Lin, et.al, vol 280 pp 207-211. jm. Tritium separation during heavy water electrolysis: Implications for cold fusion. Corrigan, et.al, vol 281 pp 305-310. Experimental investigations of electrolysis using palladium cathodes. Zahm. et.al. vol 281 pp 313-319. In-situ measurements of deuterium uptake in palladium using diffractometry. Bennington, et.al, vol 281 pp 323-323. Surface and electrochemical characterization of Pd cathodes after charging. Ulmann, et.al, vol 286 pp 257-263. Morphological difference between hydrogen-loaded and deuterium-loaded palladium. Rolison, et.al, vol 287 pp 375-384. Local heat effects by electrolysis of heavy water. Ratkje, et.al, vol 273 pp 269-273. Energy balance in the electrolysis of water with a palladium cathode Rock, et.al, in press. A critical analysis of electrochemical nuclear fusion experiments. Kreysa. et.al, vol 266 pp 437-450. Hydrogen and oxygen recombination in calorimetry of water electrolysis. Cunnane, et.al vol 269 pp 163-174. Experimental investigation of thermal and radiation effects by deuterium discharge. Chemla, et.al, vol 277, pp 93-103. Energy balance of electrolysis with a palladium cathode, Part I, Theoretical relations. Balej, et.al, vol 278 pp 85-98. Energy balance of electrolysis with a palladium cathode, Part il, Experimental results. Dlvisek, et.al, vol 278 pp 99-117. Absorption of electrolytic hydrogen and deuterium by Pd: cyanide adsorption. McBreen. et.al, vol 287 pp 279-291 . Calorimetry of the palladium-deuterium-heavy water system. Fleischmann, et.al, vol 287 pp 293-348. FIG. 5— SOME KEY PAPERS ON COLD FUSION that have recently appeared in the Journal of Elect roanatytieal Chemistry. R-E Engineering Admart Rales: Ads are WyIW. One insertion $$95 each. Six insertions $950 each. Twelve insertions $925 each. Closing date same as regular rate card. Send order with remittance to Engineering Admart, Radio-Electronics Magazine, 500-B Bi-County Blvd., Farmingdale. NY 11735. Direct telephone inquiries to Ariine Fishman. area code-1-516-293-3000. FAX 1-516-293-3115. Only 108% Engineering ads are accepted for this Admart. INCREASE YOUR EARNING POWER! LEARN TO DESIGN WITH SINGLE CHIP MICROCOMPUTERS SINGLE CHIP MICROCOMPUTER PRIMER FOH MOTOROLA G0O5 Include* * PrtfH&QT*! 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The NEW EXAM covers updated marine and aviation rules and regulations, transistor and digital circuitry. THE GENERAL RADIOTELEPHONE OPERATOR LICENSE - STUDY GUIDE contains vital information. VIDEO SEMINAR KITS ARE NOW AVAILABLE. WPT PUBLICATIONS 979 Young Street, Suite E Woodburn, Oregon 97071 Phone (503) 981-5159 Dept. 50 CIRCLE 176 ON FREE INFORMATION CARD place. For an amplifier with a 20-deci- bel gain, we know that the output will be ten times as strong as the input amplitude, at least over whatever the intended working levels of your circuit are. Audio engineers will sometimes re- fer decibels to a very specific voltage level over a specified impedance. They will then use the term dBm to specify such an absolute level. One milliwatt into a 600-ohm line is one possible absolute dBm level. In this case you are comparing the ratio of your signal against the standard refer- ence, rather than comparing it to an- other signal. But the stereo, hi-fi, and home-re- cording people have long since bas- tardized the meaning of the term dBm. Today, unless you are certain you are dealing with the professional studio audio standards, an apparent dBm is just the maximum allowable voltage level at some point in some circuit above which the distortion lev- els are no longer acceptable. Thus, while the VU Cor volume-unit) display on your receiver or recorder does in fact measure some absolute voltage level, the chances are that your particular VU units have nothing to do with anyone else's. The VU dis- play only indicates a reference level above which distortion will start to become unacceptable. Samsung has a bunch of level- meter driver chips that are simple and easy to use. Note that the driver chips all differ from a "bargraph" driv- er in that the bargraph works in linear steps and the level meter driver works in log steps. Figure 3 shows you the KA2281 which offers internal trip levels of -16, -11, -6, -3, and decibels and gives you two stereo channels that can power five lamps each. Note that some commercial units will cheat and assign a pair of light- emitting diodes to each output, giving you the illusion of ten steps when you really only have five. Figure 4 shows you the similar KA2283 which uses levels of -8, -6, -4, -2, and decibels instead. This time, I've shown you how to at- tenuate one side to make a single- channel ten-lamp display. You might want to make your lower level LED's green, a middle one yellow, and use reds for the upper ones for an addi- tional effect. In this particular circuit, less than 100 millivolts of input lights nothing and more than 900 millivolts lights everything. You can easily change the input attenuators to pick up other op- erating ranges. Note that the bottom half of the circuit has to attenuate ten decibels more than the upper one to keep all of the steps equal. Cold fusion update What ever happened to cold fu- sion? Well, Uh, Urn, Er...Two years have gone by and cold fusion remains what it started out as... a largely undu- plicatable lab anomaly in which some apparently excess unexplainable heat sometimes appears to get er- ratically generated. Since there seems to be an ongoing glut in the lab anomaly market, most interest in cold fusion has. to say the least, waned. However, there remain bunches of dedicated true believers continuing to do high-quality research in the cold-fusion area. The leading source for professional papers on cold fusion is that Journal of Electroanalytical Chemistry, a Swiss publication. A few of the more important cold-fusion pa- pers are listed for you in Fig, 5. This month's contest One thing I like to do every now and then is pick up a magazine on some hobby or industry that I'm not the least bit into. More often than not, you can find unusual ads, ideas, tech- niques, or mindsets that end up sur- prisingly relevant to your own trip. For instance, we've seen in the t_ past how Model Railroader is one £ outstanding source of unusual tools £ and techniques. I think that MR has 5 by far the finest technical writing of jj any publication anywhere ever on any 2 73 V) o z g r- o LU < IT 74 Cable TV Descrambler Article Parts We stock (he exact Parts, PC Board and Adaptor for several articles published in Radio-Electronics magazine on building your own Cable TV Descrambler. February 1984 SB-3 Type 701 Parts Pkg 519.00 Includes all original parts. 702 PC Board 7.95 Original 3X4 etched, drilled and Silk-Screen pc board, 704 AC Adaptor 7.95 1 2 to W Volt DC @ 200ma. 701, 702 & 704 29.00 All three tor special saving. February 1 987 Tri-Mode 301 Parts Pkg 29.00 Includes all original parts. 302 PC Board 7.95 Original 5X8 etched, drilled and Silk-Screen pc board. 304 AC Adaptor 7.95 12 to 18 Volt DC @ 200ms. 301, 302 & 304 39.00 Alt three lor special savings. Tri-Mode Tutorial. .7.95 26 pages of In-depth info. May 1990 Universal 901 Parts Pkg $49.00 Includes all parts. 902 PC Board 9.95 Improved 4X7 itched, drilled and Silk-Screened pc board. 904 AC Adaptor B.95 12 Volts AC O SSOma. 901, 902 & 904 59.00 All three for special savings. Snooper Stopper.. .$39. 00 Prevent Descrambler detection with snooper stopper /data blocker and protect your privacy. Includes tree article on Cable Snooping. Macrovision Kit.. .$29. 00 Macro vision now you sua It, now you don't with our macro-scrubber fdL Originally Published in Radio-Electronics . 70 Channel Cable TV Converter ..$89.95 * 6 Function Infra-Red remote, * Fine Tuning. * Memory & Recall. * Compatible with all External Descrambler. * Channel 3 & 4 switchable output, * STD, HRC & IRC compatible. CALL TOLL FREE 1-800-332-3557 Outside USA Call 1 -508-699-6935 Visa, MasterCard and COD. Add $4.00 S&H, $6.50 Outside USA. D & D Electronics, Inc. PO Box 3310, VISA MC N. AUIeboro, Ma. 02761 CIRCLE 181 ON FREE INFORMATION CARD A HARD DRIVE IS A TERRIBLE THING TO WASTE. So don't. For only $6 per hour, you can download to your hard disk from DELPHI'S library of over 10,000 pro- grams. That's right. Just $6 per hour including evening and weekend local access at modem speeds up to 2400 bps. Join DELPHI now for $9.95 and your first hour (s free. There's no risk — if you're not completely satisfied, we'll refund the $9.95. SIGH UP mm TOOT COMPUTES MID MODEM • Dial 1-800-365-4636 • At Usemame: type J01NDELPHI • At Passuiord: type RADIO Of course, you may eventually (ill up your hard disk. Then you can enjoy explor- ing DELPHI'S other services such as electronic mall, conference, multi-player games, news, stock quotes, encyclopedia, and travel. DELPHI P0HJUTWG HARD DRIVES SINCE 1982 General Videotex Corporation - Thitc Blackalone Slreel » Cambridge MA 02139 S00- 544-40Q5 ■ 6 1 7-49 1-3393 CIRCLE 186 ON FREE INFORMATION CARD level, and should be mandatory read- ing for any tech writer. Some day, I hope to eventually be able to write that good. Maybe with some more experience.... Another magazine which recently caught my eye was Radio Control Modeler. Again, lots of unusual tools and techniques. I'm wondering what happens when you use what these folks call a heat-sealing iron for Kroy Color or for circuit board dry-resist laminating. The R/C people are also into amateur-television stuff. But what I noticed the most (and this is probably ancient history to an R/C buff), is that these hobbyists now are building models at one quarter scale. No, not quarter inch scale, but quarter scale. Now, any quarter-size aircraft can hoist a respectable payload and carry it an acceptable distance. At costs that are ridiculously lower and far less regulated than "real" aviation. Uses? For video obviously. But less obvious would be such things as cave hunting, either by the regular stereo photography for sinkhole searches in difficult terrain. So for this month's contest, tell me what you would do with an aerial plat- form that can handle a respectable payload. Let's go well beyond chop- ping holes in the Goodyear blimp Cas was recently done), the nudist colony jokes, and drug deliveries. Limit all your responses to largely legal and purportedly more noble endeavors. There'll be all the usual Incredible Secret Money Machine book prizes for the top dozen entries, along with an all-expense-paid (FOB Thatcher. AZ) tinaja quest for two going to the very best. Be sure to send ail your written entries directly to me at Synergetics, and not to Radio- Electronics. Wholesale surplus sources Have you ever wondered where the surplus houses go to buy their stuff? Few hackers realize there is a lean and mean collection of small outfits out there collectively known as wholesale surplus dealers. All of the good news here is that outstanding prices are the norm. Two-cent integrated circuit sockets, three-cent LED's, quarter motors, and fifty-cent EPROM's are routine. The bad news is that you can only buy using stiff lot. line, or total-order mini- mums. There is also no technical sup- WHOLESALE SURPLUS SOURCES Ace Electronics 3210Antoine Houston, TX 77092 (713) 688-8114 CIRCLE 313 ON FREE INFORMATION CARD ACP Components 1317 East Edinger Santa Ana, CA 92705 (714) 558-8822 CIRCLE 314 ON FREE INFORMATION CARD All Components 5999 Summerside Place #208 Dallas, TX 75252 (800) 367-7312 CIRCLE 315 ON FREE INFORMATION CARD American Design Components Box 220 Fairview, NJ 07022 (800) 776-3800 CIRCLE 316 ON FREE INFORMATION CARD Braniff Industries 91 South Ottawa Dixon, IL 61021 (815) 288-4500 CIRCLE 31? ON FREE INFORMATION CARD Cafcera PO Box 489 Belmont, CA 94002 (800) 257-5549 CIRCLE 318 ON FREE INFORMATION CARD Derf Electronics 1 Biehn Street New Rochelte, NY 10801 (800) 431-2912 CIRCLE 319 ON FREE INFORMATION CARD H&R Enterprises 21521 Blythe Street Canoga Park, CA 91304 (818) 703-8892 CIRCLE 320 ON FREE INFORMATION CARD Japan Electronics 15138 Valley Blvd City of Industry, CA 91744 (818) 369-5000 CIRCLE 321 ON FREE INFORMATION CARD J&C Electronics Box 630 Salem, MA 01970 (800) 447-7014 CIRCLE 322 ON FREE INFORMATION CARD Jerome Industries 8737 Shirley Avenue Northridge, CA 91324 (818) 993-1393 C1RGUE 323 ON FREE INFORMATION CARD Leo Electronics 22353 S. Western Avenue #201 Torrance, CA 90501 (213) 212-6133 CIRCLE 324 ON FREE INFORMATION CARD Micro-C 11085 Sorrento Valley Court San Diego, CA 92121 (619) 552-1213 CIRCLE 325 ON FREE INFORMATION CARD Microprocessors Unlimited 24000 South Peoria Avenue Beggs, OK 74421 (918) 267-4962 CIRCLE 326 ON FREE INFORMATION CARD New England Circuit Sales 292 Cabot Street Beverly, MA 01915 (800) 922-NECS CIRCLE 327 ON FREE INFORMATION CARD Oracle Electronics 1355 Adams Court Menlo Park, CA 94025 (415) 326-2660 CIRCLE 328 ON FREE INFORMATION CARD Search Electronics 228 East Atara Monrovia, CA 91016 (818) 359-3350 CIRCLE 329 ON FREE INFORMATION CARD Southwest Memory 3939 Beitline Road #775 Dallas, TX 75244 (214) 484-1595 CIRCLE 330 ON FREE INFORMATION CARD Surplus Traders Winters Lane Box 276 Alburg, VT 05440 (514) 739-9328 CIRCLE 331 ON FREE INFORMATION CARD World Wide 18 Stern Avenue Springfield, NJ 07081 (800) 222-6268 CIRCLE 332 ON FREE INFORMATION CARD port or hand holding whatsoever. Our resource sidebar for this month shows you several of the bet- ter-known wholesale surplus sources. These and others often ad- vertise in the classified sections of Electronic News and the Electronic Buyer's News magazines. Except for Surplus Traders, virtually none of them have catalogs. Some provide fax current availability lists, while others prefer to bid on your needs. The foremost rule in dealing with these folks is no messing around. The preferred contact means is by fax, and most quotations are good only for twelve minutes or so. Quick cash sales are the norm. New tech literature Some ancient hacker construction projects on those solid-state vortex coolers we recently looked at include the November 1947 issue of Popular Science, and chapter 4 of the Scientific American Amateur Scien- tist reprint volume from the early 1960s. Two interesting application notes are the Introduction to Infrared Pyroelectric Detectors from ELTEC on the subject of human- motion de- tection, and the Best of the Trimmer Primers from Bourns on the use of precision trimmer potentiometers. Free samples this month include 1 K serial EEPROM's from International CMOS Technology, and SCOPE octal drivers from Texas In- struments. Tl also has a new three- volume set on Digital Signal Process- ing Using the TMS320 available. Turning to my own stuff, for the fundamentals of digital integrated cir- cuits, check into my classic CMOS and TTL Cookbooks. 1 do have auto- graphed copies on hand for you here at Synergetics. Also, a reminder that I have this new PostScript PSRT roundtable and library up on GEnie. You'll also find lots of Hardware Hacker and all the Midnight Engineering reprints and other resources here. Finally, I do have a new and free mailer for you which includes dozens of insider hardware hacking secret re- sources. Write or call for info. As always, this is your column and c you can get technical help and off- I the-wall networking per that Need § Help? box. The best calling times are ^ weekdays 8—5 in Mountain Standard ~ Time. Let's hear from you. R-E * z o CL h- O UJ O Q < 76 SELECT 5 BOOKS for only $4^ (values to $129.70) and get a FREE Gift! »gu>« For over 25 years, your most complete source for electronics books. An Absolutely No-Risk Guarantee. Membership Benefits ■ Big Savings. In addition to this introductory offer, you keep saving substantially with members' prices of up to 50% off the publishers" prices, • Bonus Books. Starting immediately, you will be eligible for our Bonus Book Plan, with savings of up to 80% off publishers' prices. » Club News Bulletins. 1 5 ti mes pe r year you wi II rece i ve the Book C I ub News . describing all the current selections— mains, alternates, extras — plus bonus offers and special sales, with scores of titles to choose from. • Automatic Order. If you want the Main Selection, do noth- ing and It will be sent to you automatically. If you prefer another selection, or no book at all, simply indicate your choice on the re- ply form provided. You will have at least 10 days to decide. As a member, you agree to purchase at least 3 books within the next 12 months and may resign at any time thereafter, • Ironclad No-Risk Guarantee. If not satisfied with your books, return them within 10 days without obligation! * Exceptional Quality. All books are quality publishers' editions especially selected by our Editori- al Board. (Publishers' Prices stiown) All books are hardcover unless number is followed by a "P" for Daperback. ~1W1 ELECTRONICS BOOK CLUB. Blue Ridge Summit. PA 17294-08 10 Or Call Toll-Free 1-800-233-1128 To Join Today! Electronics Book Cujb s Blue Ridge Summit, PA 17234-0310 ! YES! Please accept my membership in the Electronics Book Club and send the 5 volumes listed below, plus my FREE copy of Oerfon T. Horn's Alt-rime Favorite Electronic Projects (31Q5P), billing me $4.95. If not satisfied. I may return the books within ten days without obligation and have my membership cancelled. I agree to purchase at leasl 3 books at regular Club prices during the nest 12 months and may resign any time thereafter. A shippingrhandling charge and sales tax will be added to all orders. Name _ Address City State Zip Phone Signature Valid far new members only Foreign appl cams will receive special ordering instructions. Canada rmis; rem,! in US currency Tntj order subject to acceptance by the Electronics Booh Ciuo HE191 79 ggmnisEZin The Boston Sound LARRY KLE IN 03 O z O cc F O UJ _i hi O Q < Followers of this column may re- member my recounting of a mid-70 's visit from a group of touring Japanese audio journalists. In our conversations, they seemed strangely interested in the relative popularities among U.S. audiophiles of speakers with "East Coast Sound" vs. "West Coast Sound." Years later I learned that almost all Japanese audio journalists are on the payroll (as consultants) of one or an- other of the major Japanese audio companies. At that point I realized that their questions were probably not simply prompted by editorial curi- osity, but rather were part of a com- mercial fact-finding expedition. In any case, Altec and JBL speakers with their boosted mid-bass and strong upper-midrange were highly re- spected in Japan, and many Japa- nese products resembled them sonically and — in some cases — physically. Meanwhile, back in the U.S.A., a small core group of New England- based academics and amateur and professional engineers were busily producing "bookshelf" speaker sys- tems that, in contrast with those from the major West Coast manufac- turers, had a smooth, flat, wide-range frequency response and excep- tionally low bass distortion. I think it's safe to say that "East Coast Sound" began with the work of Edgar Villchur, the developer of the acoustic-suspension speaker sys- tem, CI say developer, rather than in- ventor, in the same sense that Edison developed rather than invented the light bulb. In both cases, the idea was not new — but applied talent and knowhow made it work.) The Source of the sound In the mid-1950s, Villchur founded Acoustic Research in Cambridge to manufacture and market his acous- tic-suspension designs, in the next five years, AR managed to take over at least a third of the speaker-system market with their various models — a feat that has not been equalled before or since. From this point on the story begins to resemble the Biblical "be- gats" with regard to who worked with what company and then went on to found their own. Early on, Henry Kloss, who co- founded AR along with Villchur, left to become the "K" in KLH. Kloss man- ufactured acoustic-suspension speakers under license from AR, but differed somewhat with Villchur on the question of system frequency balance. Roy Allison, now of Allison Acoustics, became plant manager for Acoustic Research, and Andy Petite, presently president of Boston Acous- tics, went to work for KLH. Petite subsequently left KLH to join Kloss in the newly formed Advent Corpora- tion, where he ultimately became the chief designer of a series of suc- cessful Advent speaker systems. Ad- vent ran into difficulties in the late Seventies, and Petite left to co-found Boston Acoustics, now one of the leading U.S. speaker companies. (Their products consistently get top ratings from Consumers Reports) A visit to Boston Acoustics Last Fall, while in Boston, I called to say hello to my old friend Andy Petite. Andy invited me to visit the new Boston Acoustics speaker-manufac- turing facility located in an industrial park about 20 minutes outside of Boston, and I jumped at the chance. Five years ago. during a previous visit to BA, I was struck by the extensive use of alignment jigs and other spe- cialized tools. These allowed the pro- duction-line workers to apply the cements in carefully measured quan- tities to assemble the tight-tolerance voice-coil and cone assemblies to the basket and magnetic structure. The first things that impressed me about the new plant were its size, and the high degree of automation on the driver assembly line. Most of the crit- FIG, 1— IN ONE OF BOSTON ACOUSTICS' manufacturing procedures, a precise amount of ferrofluid is added to each tweeter magnet assembly. 80 icai assembly processes, formerly done by hand, were being performed by sophisticated specialized ma- chines that were not only faster, but provided greater consistency in the finished product. That was reflected both in a lower reject rate and tighter performance specs. Andy told me an interesting story in that connection. When they first staded to produce woofers on the new line, the first batch had to be rejected for excessive efficiency It seems that new automatic mecha- nisms were injecting precisely the amount of cement needed, which was less than what was applied with hand construction. The lowered mass produced a woofer that was more effi- cient than the crossover and en- closure had been designed for. Anyone who still believes that elec- tronic equipment wired and as- sembled by hand is necessarily better made or more reliable than components made on an automatic line, simply doesn't appreciate the benefits of modern manufacturing technology. Speaker facts I've always felt that, at best, I was a "second-hand" hi-fi expert in that most of what 1 knew I had learned from those who were the real ex- perts — those who were up to their elbows in the day-to-day design and manufacturing process. The engi- neers who most impressed me were those whose products were a cut above the average both in perfor- mance and cost effectiveness. For that reason, I've especially valued my relationships with people like Andy Petite who are willing to share infor- mation and opinions based on real- world experiences. For most of the day, Andy and I talked about loudspeaker design and manufacturing. Below, extracted and paraphrased, are some of Andy's more interesting facts and opinions about loudspeakers in general, and Boston Acoustics loudspeakers, in particular: • It's a lot more difficult to design a good $200 speaker than a $2,000 one. Any designer who knows his business should be able to put to- gether a relatively good-sounding ex- pensive system. One of my goals as a designer is to get the best possible sound at each price level using the most cost-effective approach. This frequently involves rethinking both the design and manufacturing and production process. • We've found that it's important to make our own drivers for three rea- sons: quality, reliability, and price. When we were buying tweeters from outside vendors we always had to contend with inconsistencies in per- formance. Rejects had to be shipped back — an expensive and time-con- suming task. And failures in the cus- tomer's home, due to manufacturing flaws, were even more problematic. We knew what the problems were, but our suppliers weren't willing or able to solve them. For example, we could improve re- liability using high-temperature voice coils. However, our supplier wasn't willing to use the new voice coils be- cause his manufacturing procedure involved burning off the voice-coil lead insulation in a solder bath. High- temp insulation won't burn off — which would mean that his manufac- turing procedure would have to be redesigned. When you manufacture your own drivers and rejects occur, you can de- termine the source of the problem and, frequently, stop the assembly line and fix it then and there. Reject problems can be solved in hours, rather than weeks. • We've found if worthwhile to indi- vidually test the performance of every driver after it comes off the line be- fore it is installed in a system. This is feasible, because we have designed a separate computer test program for each driver and system we produce. Every test station has a carefully cali- brated miniature anechoic chamber with a test microphone installed. The computer provides a test signal to the driver, instantly displays the curve and other data, and then assigns a pass/fail rating. Each driver must match the reference standard within ±1dB. The complete test is done in less time than it takes to describe it. Of course, every completed system undergoes equivalent testing. We've run out of space for this month; in my next column I'll continue my conversation with Andy Petite dis- cussing crossover design, the virtues of acoustic-suspension woofers, and other practical loudspeaker manufac- turing and design matters. R-E &* CIRCLE 108 ON FREE INFORMATION CARD with over 24,000 industrial electronic components and will... 0iip your order today I! Call or Write,,. 300) 992-9943 2401 Hm 287 N. MOUSER ELECTRONICS Stocking LOcaflons Across America » CIRCLE 1 17 ON FREE INFORMATION CARD 81 EARN YOUR B.S.E.E. THROUGH HOME STUDY Our New and Highly Effective Advanced-Place- ment Program for experienced Electronic Tech- nicians grants credit for previous Schooling and Professional Experience, and can greatly re- duce the time required to complete Program and reach graduation. No residence schooling re- quired for qualified Electronic Technicians. Through this Special Program you can pull all of the loose ends of your electronics background together and earn your B.S.E.E. Degree. Up- grade your status and pay to the Engineering Level. Advance Rapidly! Many finish in 12 months or less. Students and graduates In all 50 States and throughout the World. Established Over 40 Years! Write for free Descriptive Lit- erature. COOK'S INSTITUTE OF ELECTRONICS ENGINEERING |9tyE 4251 CYPRESS DRIVE ^^■*- E JACKSON, IvHSSISSIPPt 39212 CIRCLE SB ON FREE INFORMATION CARD EQUIPMENT REPORT continued from page 12 DC resistance. When you have your circuit built, you can turn on the power and get out the test equipment to see how it works. The Protolab is equipped with a voltmeter, ammeter, ohmmeter, wattmeter, dual-trace oscilloscope, and sweep generator. Since the Protolab is primarily a teaching tool, the manual is one of its most important components. Six- teen experiments guide the user through important AC/DC circuit- analysis concepts, and each experi- ment offers an "Observation and Im- plications" section that emphasizes the lessons that should be noted, along with the pages in popular text- books where additional information can be found. We wish we'd had the Protolab back in our college days. It would have made some of the important concepts easier to get a handle on thanks to the instant gratification it offers. Protolab does, of course, have seme limitations, such as the inability to show parts values on the sche- matic, and the inability to support Hercules graphics. However, at $99.95 for the PC version and $129.95 for the Mac version — about the price of two or three college texts — it's certainly a good invest- ment. We hope to see future versions that support active components and other more advanced topics. R-E CO o z O rx r- o LU O Q < rr 82 "Plant a tree today for P^ all the world to share" Wh. 'hen we think of trees, we usually think of what we can see and hear. They shade and cool our homes, bring song birds close by, and mark the changing seasons. But trees also clean the air we breathe and help keep the atmosphere in balance, which makes life possible. You can make life better for your chil- dren and for the future. Join me and plant a tree today for all the world to share. For your free brochure, write: Trees for America, The National Arbor Day Foundation, Nebraska City, NE 68410. John Denver for The National I Arbor Day Foundation BATTERY TECHNOLOGY continuedjrom page 49 age current. In other words, the battery is not completely discon- nected from the load circuit even when the power is turned off. Over a period of time, ranging from one week to two months, leading to minor battery leakage. Even if designed to prevent such an occurrence, a minor short may occur, insufficient to affect performance even when turned on, but resulting in what's known as "creep" leakage. In the above cases, "creep" usu- ally manifests itself as white fuzz around the top seal of a cell. To avoid it, turn power switches off when equipment isn't in use. In radios unused for extended peri- ods, remove the batteries, and re- place them when needed. Even if creep does occur, a Ni-Cd cell can be recharged, with proper care, • Ni-Cd cells have been around a long time, and yet the applica- tion of that technology is grow- ing and changing. What tech- nology improvements, if any, have occurred that we should be aware of, and is there anything better available on the horizon? Ni-Cd manufacturers are con- tinuously seeking to improve product capabilities and quality. Increased capacity means lon- ger run times; for many years, makers have boosted capacity by over 10% a year, itself driving re- search into new electrochemical couples. Rechargeable lithium and Ni-metal hydride cells are prominent contenders, with sig- nificant increases in energy den- sity over Ni-Cd cells, but their availability is still limited. Safety continues to impede broad acceptance of lithium cells. Metal-hydride is progress- ing steadily, and is also equiv- alent in voltage to that of Ni-Cd cells. Broad acceptance of metal- hydride depends on its ability to be successfully used in several environments. Ni-Cd cells offer such flexibility today, at reason- able prices. Also, the prices of newer technologies will further impede broad acceptance. In our next article, we'll spotlight some recent ingenious and innovative applications of batteries. R-E Try the J— fffiirfm bulletin board system (RE-BBS) 516-293-2283 The mare you use it the more useful it becomes. We support 300 and 1200 baud operation. Parameters: 8N1 (8 data bits, no parity, 1 stop bit) or 7E1 (7 data bits, even parity, 1 stop bit). Add yourself to our user files to increase your access. Communicate with other R-E readers. Leave your comments on R-E with the SYS0P. RE-BBS 516-293-2283 LEARN VCR CLEANING/MAINTENANCE/REPAIR EARN UP TO $1000 A WEEK,WORKING PART TIME FROM YOUR OWN HOME! THE MONEY MAKING OPPORTUNITY OFTHE1990'S IF you are able to work with common small hand tools, and are familiar with basic electronics (i.e. able to use voltmeter, understand DC electronics). . . . IF you possess average mechanical ability, and have a VCR on which to practice and learn. . . .then we can teach YOU VCR maintenance and repair! FACT: up to 90% of ALL VCR malfunctions are due to simple MECHANICAL or ELECTRO-MECHANICAL breakdowns! 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Precision cleaning agents, flux removers, bulk solvents, circuit refrig- erants, precision dusters, non-residual wipers, premoistened pads/swabs, antistatic compounds, conformai coat- ings, lubricants, adhesives, desoider- ing braids and soldering products. Complete with technical specifications and application guide. Chemtronics Inc. 8 125 Cobb Centre Drive Kennesaw, GA 30144 1-300-645-5244 m GA 404-424-4883 CIRCLE 54 ON FREE INFORMATION CARD Get A Complete Course In ELECTRONIC ENGINEERING 8 volumes, over 2000 pages, including all necessary math and physics. 29 examinations to help you gauge your personal pro- gress. A truly great learning experience. Prepare now to take advan- tage of the growing demand for people able to work at the engin- eering level. Ask for our brochure gK/ing complete details of content. Use your free information card num- ber, or write us directly. $99,95, Postage Included. Satisfaction guaranteed or money refunded. *\ fW\y \i v_ Banner Technical Books, Inc. 1203 Grant Ave. Rockford, I L 61103 CIRCLE 67 ON FREE INFORMATION CARD > Z C > < 83 CIRCLE 177 ON FREE INFORMATION CARD COMPUTER CONNECTIONS Some predictions for the PC's to come during the next decade. JEFF KOLTZMAN m y z o £ o LU -I LU I o < s This marks the first issue of 1991, so I thought I would take a look at where things in the PC industry are going. Much of the PC future revolves around a single product. Even though that product has been on the market for only a few months so far, it's fair to say that al- ready it has permanently altered the course of the PC industry. You've probably guessed that that product is Windows 3.0. Windows' success apparently ex- ceeds even the most optimistic sales projections, and it has forced a com- plete redefinition of the relationship between IBM and Microsoft, along with a redefinition of the boundaries between OS/2 and Windows. For ex- ample, Microsoft has indicated that OS/2 2.0 will include a compatibility layer that will allow Windows applica- tions to run with a slight performance penalty, and that OS/2 3.0 will run Windows applications directly, with- out a loss in performance. (Microsoft has already privately shown Windows programs running under the as-yet unreleased OS/2 2.0, the long- awaited 386-specific version.) In ad- dition, it now seems that some of OS/2's most advanced features will migrate down Cover?) to the Windows environment. So in a sense it seems that the two products are in the pro- cess of merging. However, after months of rumors about troubles between IBM and Mi- crosoft, the two companies recently announced that the two product lines will be developed separately. IBM will develop for OS/2 and Microsoft for Windows Cand DOS). The two com- panies will cross-license each other's products, and Microsoft will also take responsibility for developing a "porta- ble" OS/2, that presumably will run on non-80xxx family CPU's, including perhaps the 68K family used in the Macintosh line and many worksta- tions, or some RISC family. If the lat- ter occurs, a prime candidate would be IBM's RS6000 workstations, which were released last year, and which finally brought IBM some much-needed credibility in that mar- ket. Although the companies' respec- tive roles have crystallized, product differences still remain murky; most likely the product for which the best software is written first will win out in the end. And considering the diffi- culty of developing for both environ- ments. Windows' head start may give it a clear long-term advantage. In the meantime, what about Windows 3.0 as it currently exists? Beauty and brains Some would call Windows 3.0 the most-hyped PC product to hit the market in years. Others, while ac- knowledging the hype, insist that there really are some brains behind the pretty face, I've been using Win- dows for several months now in a variety of modes, with a variety of display adapters. CPU types, and memory capacities, and with a variety of software, including regular DOS applications, the built-in Windows apps, and numerous large and small Windows apps. My overall con- clusion? The hype is real, but the product is substantial. Windows is imperfect, but with the right hard- ware, it is both powerful and pleasur- able to use. Should you switch to Windows? No, if you don't have at least a 10- MHz 286. No, if you find learning new software (which really amounts to learning a new metaphor of the world) a pain in the you-know-what. No, if you still insist that your CP/M ma- chine with 160K floppies does every- thing you need it to. Ofes. there really are people who still believe that.) No, if you're not willing to put up with some bugs. No, if you enjoy the idea of dropping anchor and watching the rest of the world sail on by. But if you've got a sense of adven- ture, or if you would simply like to try a new way of doing things, or if you ftegrGan Manager £ile Options Wj inlaw Help Main i Ffe Manage! Control Panel Flint Managn I n £> Cfchoard DOS PiottW Windows 5 flip TonlBook EQ HI CQ looBa*. DajBock Ouick Tour Accessaries Write Notepad m Celenda PIFEoMo PaHbush On Recofdef Tetrroal Zaait WIN Sleuth Tiffany Gaines Senate Reveisi ^ fea DOS Applications o a. m Quotes GrsnoVie^ Qedit/Tenv HypaLex RG. 1— AN EXAMPLE OF WINDOWS' ICONS. 84 R-E Computer Admart Rates: Ads are 2W'x2 7 A". One insertion $995 each. Six insertions $950 each. Twelve insertions $925 each. Closing date same as regular rate card. Send order with remittance to Computer Admart, Radio-Electronics Magazine, 500-B Bi-County Blvd.. Farmingdale, MY 11735. Direct telephone inquiries to Arline Fishman, area code-1-51 6-293-3000. FAX 1-516-293-3115. Only 100% Computer ads are accepted for this Admart. GETTING THE MOST FROM YOUR PRINTER Getting The Most From Your Printer BP181— It is probable that 80% of dot-ma- trix printer users only ever use 20% of the features offered by their printers. This book will help you unlock the special features and capabilities that you probably don't even know exist. To order your copy send S6.95 plus $1.50 for shipping in the U.S. to Elec- tronic Technology Today Inc., P.O. Box 240, Massapequa Park, NY 11702-0240. PT68K4 680G0-16MHZ *EGA/VGA* ♦HIGH DENSITY DRIVES* • 4 MB of onboard DRAM • 4 RS232 + 2 Parallel Ports • Floppy Disk Controller • 7 XT Expansion Slots 12 MHZ Kits from $220 Assembled Boards from $579 Professional OS9/68000 $299 Peripheral Technology 1480 Terrell Mill Rd. Suite 870 Marietta, GA 30067 404/984-0742 IC< PROMPT DELIVERY!!! SAME DAY SHIPPING (USUALLY! OUWiTITV ONE PRICES SHOWN lot OCT 2l. [*» OUTSIDE OKLAHOMA NO SALES TAX DYNAMIC RAM n 4M Boaid lor dp LJs w 2MB 5170.00 I S 175.00 S = £■ SIMM !M IBM PS 2 Modal TO tj SIMM 1 MAST Prem3a633Mhf 125.00 i! SIMM iM-.s 80 ns 53.00 | 1 s SIMM 256Kxs 100 ns 213.00 5 ; a 3 1Mbit im«i 60 ns 1 0.93 " " a? 'Mbit imxi 80 ns 5.95 : - h 41256 256K*t 80 ns 2.B5 1 1 41256 256Kx1 100 ns 2.05 J ; ■ 41256 256Kjn 120 ns 1.85 I % rii 4464 tutori 100 ns 2.00 j | gjH 41264* wiws 100 ns 5.95 ■ H> EPROM Hr 27C1000 12SK»8 200 ns S1 5,00 IP m 27C512 WKxe 120 ns 5.25 ■ °S 27256 3-2K*8 150 ns 6.75 ■•'1 271 28 16K*8 2S0 ns 3.75 Ki §1 STATIC RAM 8b 62256P-10 GSKkB 100 ns :iiv : ir.»jj 6264P-12 sKua 120 ns J " C J| OPE N6DAYS.7jo*u. 10 pm SHIP VtA FED- EX I SAT DEL OH M,VK.r^V;r,* " LIPS C A FED E* ORDERS U IC ROPhOCESSOhS JNL IMITED \HC. RECEIVED BY: r c ^ 5 5 rsr (918) 267-4961 Mo minimum order. c«w ta COO AtfAIHOLE . , : ..... ..■ !■ CIRCLE 189 ON FREE INFORMATION CARD CIRCLE 61 ON FREE INFORMATION CARD require a new way of doing things, Windows is your ticket to the future. Just as surely as DOS replaced CP/ M, a graphical environment is going to replace DOS. And although Win- dows is the first step into the future, it certainly won't be the last. Even on optimal hardware, Win- dows has several problems, including its user interface, its lack of serious multitasking, and font management. The user interface problem is that Windows does nothing to simplify the MS-DOS file system metaphor. Al- though you can associate icons with programs, you cannot associate icons with files or directories. Thus, file management under Windows re- quires an abstract understanding of the hierarchical file system. On the other hand, if icons were smarter and we could associate them with other types of objects, the icons could represent real-world objects. Forexample, you might have a project icon that would provide a way of organizing several different sorts of files (CASE diagrams, a desktop- published business presentation, CAD schematics, etc.). To work on one item in the project, you would "open" the project icon, click on, for example, the CAD icon, and up would come your circuit diagram. You can achieve that type of effect in a limited way with Windows now (see Fig. 1), but the product really needs a com- plete metaphor built on the way we work, not computers. As for multitasking. Windows cur- rently has what is called non-pre- emptive multitasking, which means that all programs must cooperate — i.e.. give up use of the CPU periodically. In a preemptive multi- tasking system (UNIX or OS/2), the operating system itself periodically interrupts each task, so no task can hog resources. The effect of the lat- ter system is much smoother coordi- nation among programs. A related issue is that of "threads". In a full multitasking system, a task can spawn subtasks, or threads, which perform processing indepen- dently of the main task. Threads are the only way to perform simultaneous background operations efficiently. Who needs background opera- tion? Maybe you don't, but your soft- ware does. Here are a few examples. A spreadsheet could recalculate while you enter data. A desktop pub- lishing program could repaginate while you spruce up other pages. You could plot a PC board layout from your CAD program while transferring the parts data to a word processor. Your system could back itself up in the background with no intervention by you. Your system could perform automatic daily downloads of Email from your favorite on-line service, again without intervention. Those things may sound fanciful, but some of them are available al- ready, albeit in limited form. By the end of the decade, we will take those types of activities for granted. Hardware issues Some people say that Windows will never achieve really widespread popularity because it requires a 386 to run most efficiently. I believe that the converse is true. I think that peo- ple with less-powerful machines will try Windows, like it, want better per- formance, and thereby be persuaded to upgrade. Again, an analogy with CP/M is appropriate. In 1981, when the PC was introduced, 64 K of mem- ory and no hard disk were standard. Five or six years later, ten times the amount of memory and 20-MB hard disks were standard. Now, t MB of memory and 40- MB hard disks are minimum standards; I see more and more offices with 4 MB of RAM and 100-MB hard disks. Of course video and printer tech- nologies have evolved drastically in that time period, as well. For exam- ple, in 1980 I bought a Qume daisy- wheel printer for about $1000 more than what I paid for an HP LaserJet with 1.5 MB of memory, a font car- tridge, and numerous soft fonts, in 1988, The trend will continue. You will be able to buy a laser printer, sooner than you think, without mortgaging c > < 85 The LOW COST, EASY Way To Learn About Computers FRIENDLY VIDEOS presents COMPUTER HOW-TO VIDEOS Vdeo Tape Is A Great Teacher ■HOW TO BUILD YOUR OWN IBM 286/386 CLONE" $38.95 + SHIPPING AND SALES TAX ■SHAKE HANDS WITH YOUR IBM PC/XTMT COMPUTER* $29.95 + SHIPPING AND SALES TAX 'UPGRADE YOUR PC TO A 28&-AT FOR UNDER S150* 124.95 + SHIPPING AND SALES TAX ■HOW LASER PRINTERS WORK* S39.85 + SHIPPING AND SALES TAX ORDER NOW! VSA Friendly Videos ^^ PO Box 5684 m Garden Grove, CA 92645 (714) 898-4055 HE3DA ■BUctronij:, gr SSS, 3 I 1 1 J* — NM/ — \ * f il \r.:v fr| I -pit -ir.i'nr*, I. ■ mm>mmmmm mm m mm Your Ticket To SUCCESS Over 25,000 technicians have gained admit- tance worldwide as certified professionals. Let your ticket start opening doors for you ISCET offers Journeyman certification in Consumer Electronics, Industrial, Medical, Communications, MATV, Radar, Computer, and Video. For more information, contact the International Society of Certified Elec- tronics Technicians, 2708 West Berry St., Fort Worth, TX 76109 ♦ (817) 921-9101. Name Address City State -Zip. Send material about ISCET and becoming certified. _Send one "Study Guide for the Associate Level CET Test." En- closed is $10 (inc. postage). your grandmother. Hardware capabilities will continue to evolve because people's needs are nowhere near being met. Presenting a respectable metaphor to the aver- age user requires lots of CPU power, lots of video resolution, and lots of hard-disk space. I believe that by mid- decade, the average machine will be a 33-MHz 386 with 16 MB of memory, a 300-MB hard disk, video with reso- lution of about 1000 pixels in both directions, built-in sound/video com- pression and processing, modem/ fax, and a 300-DPI hardcopy output device based on PostScript or some derivative thereof. Many people will have some sort of optical storage capability. CD-ROM is a candidate, but its 550-megabyte capacity may turn out to be a limita- tion as the use of bit-mapped graph- ics, sound, and video data become more widespread. The video system will be NTSC-compatible, HDTV- compatible (if U.S. manufacturers ever get their act together), and will have a standard rasterizing mecha- nism, which again will probably be PostScript or a derivative. All I/O sub- systems will be based on coprocessors controlled by a multi- tasking/multiprocessing derivative of Windows, OS/2, or both. What will we be doing with all that hardware? Nearly everyone will be using a graphical operating environ- ment (which will nonetheless main- tain an optional command-line mode for power users). The operating sys- tem will provide a much more intuitive way of managing files. The concept of files will fade, to be replaced by com- pound documents that include all sorts of media. Multimedia tech- nology will just becoming of age, now that a significant number of users have the requisite hardware. Multimedia will be used exten- sively for educational purposes: com- puter-based training and on-line tutorials will have sound, video, and will be fuily interactive so that the direction a course follows will depend on user responses. The emergence ITEMS DISCUSSED • Windows 3.0 ($149), Microsoft Corp., 17011 NE 36th Way, Box 97017, Redmond, WA 98073-9717. (206) 882-8080. CIRCLE 41 ON FREE INFORMATION CARD of serious PC-based multimedia will finally spur the educational market to embrace PC technology in a big way. Looking for an opportunity? Multi- media presentations of all traditional subject matters — language, history, math, and science— are going to be hot sellers, both to schools and to forward-looking parents. Conclusion Ignoring Windows' influence for the moment, it's impossible not to notice the inexorable trend toward tech- nological improvement. Disk drives are getting bigger and faster. Video systems are getting bigger and fast- er — and smarter. CPU's are getting bigger and faster. The improvements in hardware are not part of Micro- soft's plan to insinuate Windows into every nook and cranny of the comput- er-literate world. Hardware improve- ments are happening because real- world data requires it. Real-world data includes graphics, sound, and video, not just 80x25 screens of text. Windows may be the environ- ment that helps erase the distinction between the computer and what we do with it — or it may not. Regardless, Windows, or something like it, will become a standard. Hardware is get- ting bigger, faster, and smarter — not to make money for the hardware manufacturers but because the real world is large and complex. The per- sonal computer can do much more now than it could ten years ago, but the next ten years will see even more fantastic .growth in capability. It's also going to be a lot of fun getting there. Next time the discussion will be more practical, with hints about how to get the most out of Windows 3.0, along with discussions of particular programs. R-E o *ffli*W*w. ' 'He said take two aspirins mid bring it to his shop first thing in the morning!" 86 MARKET CENTER FOR SALE DESCRAMBLERS. All brands. Special: Combo Jerrold 400 and SB3 $165.00. Complete cable de- scrambler kit $39.00. Complete satellite de- scrambler kit $45,00. Free catalog. 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ORDER TODAY! 800-327-8544 CABLE TV converters: Jerrold, Oak, Scientific At- lantic, Zenith & many others. "New MTS" stereo add-on: mute & volume. Ideal for 400 and 450 owners! 1 (800) 326-7623, Amex, Visa, M/C accept- ed. B & B INC., 4030 Beau-D-Rue Drive, Eagan, MN 55122. TUBES, new, up to 90% oft, SASE, KIRBY, 298 West Carmel Drive, Carmel, IN 46032. PROGRAMMABLE stepper motor drive & control for under $100, IBM PC/XT compatible. Com- modore 64, or other with 25 pin parallel port. PCB, interface, & software. Send for detailed literature to: MASE, R.D. #2 Box 166. Mohrsville, PA 19541. CABLE TV converters and descramblers. We sell only the best. Low prices. SS-3 $79.00. We ship C.O.D. Free catalog. ACE PRODUCTS, P0 Box 582, Dept. E, Saco, ME 04072. t (800) 234-0726. PRINTED circuit boards etched & drilled. Free deliv- ery. K 4 F ELECTRONICS, INC., 33041 Groesbeck. Fraser, Ml 48026. (313) 294-8720. LASERS. 1mw to 2kw, worlds largest selection of new & used surplus. Free catalog. MWK INDUS- TRIES, 1269 Pomona Road. Corona, CA 91720. (714) 278-0563. PHOTOFACT folders under #1400 S4.00. Others S6.00. Postpaid. LOEB, 414 Chestnut Lane, East Meadow, NY 11554. TOCOM VIP converters wftemole from $279.00. Toeom super chips turn on everything, 569.00 each. Phone (219) 935-4128. CLASSIFIED AD ORDER FORM To run your own classified ad, put one word on each of the lines below and send this form along with your check lo: Radio- Electronics Classified Ads, 500-B Bi-Courity Boulevard, Farm ingd ale, NY 11735 PLEASE INDICATE in which category of classified advertising you wish your ad to appear. For special headings, there is a surcharge of $25.00. ( ) Plans/Kits ( ) Business Opportunities ( ) For Sale ( ) Education/instruction ( ) Wanted ( ) Satellite Television Special Category: $25.00 PLEASE PRINT EACH WORD SEPARATELY, IN BLOCK LETTERS. (No refunds or credits for typesetting errors can be made unless you clearly print or type your copy.) Rates indicated are for standard style classified ads only. See below for additional charges for special ads. Minimum: 15 words. 10 11 12 13 14 16 ($49.60) 17 ($52.70) 18 ($55.80) 19 ($58.90) 15 ($46.50) 20 ($62.00) 21(565.10) 22 ($68.20) 23 ($71 .30) 24 ($74.40) 25 ($77.50) 26 ($80.60) 27 ($83.70) 28 ($86.80) 29 ($89.90) 30 ($93.00) 31 ($96.10) 32 ($99.20) 33 ($102.30) 34 ($105.40) 35 ($108.50) We accept MasterCard and Visa tor payment of orders. If you wish to use your credit card to pay tor your ad till in the following additional information (Sorry, no telephone orders can be accepted.): Card Number Expiration Dale Please Print Name Signature IF YOU USE A BOX NUMBER YOU MUST INCLUDE YOUR PERMANENT ADDRESS AND PHONE NUMBER FOR OUR FILES. ADS SUBMITTED WITHOUT THIS INFORMATION WILL NOT BE ACCEPTED. CLASS1FSED COMMERCIAL RATE: (for firms or individuals offering commercial products or services) $3.10 per word prepaid (no charge for zip code),.. MINI MUM 15 WORDS. 5% discount for same ad in 6 issues; 10% discount for same ad in 12 issues within one year: if prepaid. NON-COMMERCIAL RATE: (tor individuals who want to buy or sell a personal item) 52,50 per word, prepaid.-.no minimum ONLY FIRST WORD AND NAME set in bold caps at no extra charge. Additional bold face (not available as all caps) 55$ per word additional. Entire ad in boldface, $3.70 per word. TINT SCREEN BEHIND ENTIRE AD: S3.85 per word. TINT SCREEN BEHIND ENTIRE AD PLUS ALL BOLD FACE AD: $4 50 per word EXPANDED TYPE AD: $4.70 per word prepaid. Entire ad in boldface. S5.60 per word . TINT SCR EEN BEHIND ENTIRE EXPANDED TYPE AD: S5.90 per word. TINT SCREEN BEHIND ENTIRE EXPANDED TYPE AD PLUS ALL BOLD FACE AD: $6.80 per word. DISPLAY ADS: 1" x 2W— $410.00; 2" x 2W— $B20.00; 3" x 2W — $1230.00, General Information: Frequency rates and prepayment discounts are available. ALL COPY SUBJECT TO PUBLISHERS APPROVAL. ADVERTISEMENTS USING P.O. BOX ADDRESS WILL NOT BE ACCEPTED UNTIL ADVERTISER SUPPLIES PUBLISHER WITH PERMANENT ADDRESS AND PHONE NUMBER. Copy to be in our hands on the 10lh of the third month preceding the date of the issue, (i.e., Aug. issue copy must be received by May 10th). When normal closing date falls on Saturday, Sunday or Holiday, issue closes on preceding working day. Send tor the classified brochure. Circle Number 49 on the Free Information Card. > c > ? to to 87 O z o CE H o o Q < CB RADIO OWNERS! We specialize in a wide variety of technical information, parts and services for CB radios. 10-Meter and FM conversion kits, repair books, plans, high-performance accessories. Thousands of satisfied customers since 1976! Catalog $2. CBC INTERNATIONAL P.O. BOX 3150DRE, PHOENIX, AZ 85046 FM 2-way, CB/amateur, scanners, radar detec- tors, auto alarms, catalog $1.00, RAYS, PO Box 14862, Fort Worth, TX 76117. CABLE converters, all major brands. Info ■ or- ders 1 (800) 782-0552. FREEWAY, INC., SMP PO# 5036. Burnsville, MN 55337. CALLER ID displays phone number of person call- ing you after first ring. $89.95 PPD, EDE, PO Box 337, Buffalo. NY 14226. BLACK market, hacking, phreaking, weapons, electronic surveillance, communications, more. Hardware, software, plans, kits, books. $1.00 cata- log: OMEGATECH, PO Box 8789C. Woodlands, TX 773S7. RADIO tubes, parts. Extensive listings. $1.00 (re- fundable). DIERS, 4276-E6 North 50th Street. Mil- waukee, Wl 53216-1313. FREE catalog: Save hundreds on sought after elec- Ironic, electro mechanical, and computer related hardware and components — including hard-to-find items. Call toll free: 1 (800) 776-3700. AMERICAN DESIGN COMPONENTS/Dept. 119-011, 815 Fair- view Avenue, Fairview, NJ 07022. CABLE DESCRAMBLERS, wholesale prices, Tocoms, Oaks, Jerrotds. Hamlins. S.A.. Tri-Bi's, ex- amples — Oak RTC-56 $150 00, Tocom 5503 -A $250.00, COD orders OK, MOUNT HOOD ELEC- TRONICS (503) 253-0459. T.V. notch filters, surveillance equipment, brochure $1.00. O.K. VIDEO, Box 63/6025, Margate, FL 33063. (305) 752-9202. CABLE descramblers (Jerrold) from $40.00. Tocom VIP test chip. Fully activates unit. Also Zenith test board. Fully activates Z-Tacs. $50.00. Call (213) 867-0081. PROTOQUICK Z8, single board computer with pro- totype area, $69.00, SOFTWARE SCIENCE, 3750 Ftoundbottom Road, Cincinnati, OH 45244. (513) 561-2060. GREAT buys, surplus prices, DC motors, PS-13VDC-20A, light chasers, fiber optics, transfor- mers, scope probes, vacuum pumps, LSASE. FER- TIK'S, 5400 Ella, Fhila., PA 19120. LOST control of your home entertainment cen- ter? Send for a free brochure of innovative, remote controlled switching products to: INFRACON, Dept. RE, Box 1205, Richardson. TX 75085-1205, (214) 437-3366, Quality Microwave TV Antennas WIRELESS CABLE ■ IFTS - MM0S - Amateur TV Ultra High Gain 50(lb(+) • Tunable 1.9 la 1.7 Gt!I. • 36-Channel System Complete S 1 49.95 • 12-Channel System Complete S1 14.95 • Call or wilt (SASE) tor "FREE" Catalog PHILLIPS-TECH ELECTA (Ml CS P.O. Boi 9533 • Scottsrtaie, AZ 85252 = (602) 947-7700 (S3.00 Credit ill phone order!) WARRANTY MaiterCard ■ Vita • COD'S ■ Oja-nlY Pricing KITS, MC687Q1 programmer $135.00, Morse code keyboard $75.00. ten meter FM conversion $25.00. SINGLE CHIP SOLUTIONS, Box 680, New Hartford, CT 06057-0680. SURVEILLANCE Countersurveiflance electronic equipment catalog, transmitters, radar jamming, books, $10.00, EDE, PO Box 337, Buffalo, NY 14226. HELP! If you buy cable units, interference filters, computer equipment, electronic components, inte- grated circuits, capacitors, resistors, power supplys. Stop! Call our toll-free number 1 (800) 762-9730 for free catalog. CABLE TV TB-3 (Tri-Bi) or SA-3 Quantity Prices 10 20 $48. $43 Each 50 Each 100 3>WWa %|>03a Each Each Hours open 10:00 am to 4:00 pm Eastern time Minimum order 5 units 55.00 ea. Dealers wanted. We ship COD. King Wholesale 1-800-729-0036 Fax number 6173400053 "No one beats the King's prices!" DESCRAMBLERS Try the Electronics bulletin board system (RE-BBS) 516-293-2283 The mare you use it the mere useful it becomes. We support 300 and 1200 baud operation. Parameters: 8N1 (3 data bits, no parity, 1 stop bit) or 7E1 (7 data bits, even parity, 1 stop bit}. Add your sell to our user liles to increase your access. Communicate with other R-E readers. Leave your comments nn R-E with the SYSDP. RE-BBS 516-293-2283 PRO 400 95 '69 AODC VOLTAGE ACi'DC CURRENT DIODE TEST Stock Ha LOGIC TEST 99009S LEO TEST GOOD,' BAD =. FREG RANGES 5 CAPACITANCE HANGES LOW BATTEBV Warning CONTINUITY TEST/BUZZEH TRANSISTOR CHECKER 20 mhz FREQ COUNTER ■52 KFLVI N Eiscircfcs « c ^,m m 7 FaTchild Av&.. Plainviflw. NY 1'B03 u "" (616) 349-7620 1(800)645-9212 FAX (516) 349-7830 3QDAY MONEY BACK GUARANTEE! VISA DESCHAMBLERS, Tocoms — Tocoms — and more Tocoms Oak RTC-56 $1 50.00, Jerrold 400 $125.00, Hamlin 6600-3M $125.00, super Tri-Bi $79.00, SA-3-B $79.00, Same low prices on all lines of equipment. COD orders OK. S.A.C. Orders only 1-800 622-3799. Info (647) 647-3799. ARTWORK created for use in printed circuit board production from your engineering schematics. Pro- fessional quality hardcopy, Gerberfile, or Photoplot- ter outputs. Reasonable rates. Send for details to: JTD ENGINEERING, 10628 Grandview Place, Alta Loma.CA 91701. CA8LE TV brokers and distributors high volume of descramblers Jerrold SB-3 refurbished or as is, con- verters Jerrold models DRX-400, JRX and hand remote control (no Canada sales for descramblers). Affitech, ask DANIEL PERREAULT (514) 656-9150. FREE CATALOG FAMOUS "FIRESTIK" BRAND CB ANTENNAS AND ACCESSORIES. QUALITY PRODUCTS FOR THE SERIOUS CB'er. SINCE 1962 FIRESTIK ANTENNA COMPANY 2614 EAST ADAMS PHOENIX, ARIZONA 85034 IF you want some of the prices on converters, de- scramblers, remotes, call B&S SALES (313) 365-0908. Example — Jerrold DRX-3-DIC SB built in, for one — $110.00 delivered. Quantity prices available. SERVICERS: Save time & money! The DTS125 automatically tracks service time & charges for your repair jobs. Call or write for brochure. JOHNSON ELECTRONIC TECHNOLOGIES, 5 Kane Indus- trial Drive, Hudson. MA 01749. (508) 562-1157. WIRELESS CABLE RECEIVERS 1.9 TO 2.7 GHz 30 CH PAR ABOLIC DISH SYSTEM SITS. SO 30 CH POD ANTENNA SYSTEM S193-30 30 CH CHYSTAL CONTROLLED SYSTEM SJ94 M SIH MICROWAVE INTL. INC. SEND S1.M FOR r-.o. t ox i zisn caialoO 0« these PHDEWX, a. 1S067 AN0 OTHER fINE [£42) r: J. j£ '-) VIDEO PRODUCTS QUANTITY DISCOUNTS mutcii of thc sfrrfH wsimss sunuii Q COMMUNICATIONS SECURITY ASSOCIATION — Electronic su rve I iance , counte rsu rvellance, com- munications security topics — membership infor- mation — POB 7069. Gaithersburg. MD 20898. (301) 309-3731. NEW devices: proximity switch, static snooper, per- sonal defender, laser supplies, bug snooper, PC interfaces and more. Catalogue $2.00. BAUER, 35 Soucy, Delson, Quebec, J0L 1G0, FREE catalogue. Computers. Electronic parts and kits. Filters, amplifiers, power supplies. Radio Shack Dealer. MCDOWELL ELECTRONICS, Box 1206, Brewton. AL 36427. (205) 867-8805. STUTTgUNS — 65KV $35.00 120KV $55.00. Free catalog. MOEBIUS UNLIMITED, POB 2562. Lilburn, GA 30226. DESCRAMBLERS — Cable TV converters — lowest prices, best quality, guaranteed, CNC CON- CEPTS INC., Box 34503, Minneapolis, MN 55434. 1 (800)535-1843. TUBES Sylvania 6LQ6, 6L6GC, 20LF6 etc. Huge discounts. ARLEN SUPPLY, 7409 West Chester Pike, Upper Darby, PA 19082. 1 (800) 458-1301. 88 JERROLD 450 turn-on boards, plug-in. no modi- fications, $40.00 (or kit, $50.00 assembled, quantity discounts available. Send check or money order to DIVERSIFIED WHOLESALE, 7014 E. Golflinks, Suite 141. Tucson, AZ 85730. PLANS AND KITS MINI ATURE FM transmitters! Tracking transmitters! Voice disguisers! Bug detectors! Phone Devices! More! Available in kits or assembled! Catalog $2.00: XANDI ELECTRONICS, Box 25647. Dept. 60M, Tempe, AZ 85285-5647. CATALOG: hobby/broadcasting/KAM/CB: Cable TV, transmitters, amplifiers, surveillance devices, computers, more! PAN AXIS, Box 130-F6. Para- dise, CA 95967. SURVEILLANCE transmitter kits! Four models ot each; telephone, room, combination telephone/ room transmitters tune from 65 to 305 MHz. Catalog with Popular Communications and Popular Electronics book reviews of "Electronic Eaves- dropping Equipment Design," S1.00. SHEFFIELD ELECTRONICS, 7223 Stony Island Ave. . C h icago, tL 60649-2806. I :RE MOTE CONTROL KEYCHAIN CompEftte w'rruni-U r ens miliar and +5 vdc HF rtceiver ; Fulty sssymtded including plans .... :.:>.(Cr build your own a ut o alarm : : 'Quantity discounts available ■ Check, Visa or M/C Add $ 3 chipping VISITECT INC, BOX 5442, SO. SAN FRAN.. CA. 940BG $24.95 (415) 872H0128 Fax (415) 872-2635 CB Tricks II book. Power amplifierdesign and theo- ry, UHF CB tune ups. Send $19.95 MEDICINE MAN CB, PO Box 37, Clarksville, AR 72830. COMPUTER KITS General Technics Quality Computer Systems Post Office Box £576 Lake Ronkonkoma, NY 11779 (516)981 -9473 I^^ffi ! -J >- General Technics Computer Kits include a compkie line of SOWS, 286. and jUb models. L hey are designed /*— - \ lo offer the highest degree of quality *- =J and reliability available today. They're also fun, easy to build, educational* fully IBM compatible very powerful, and at wholesale prices. All kits arc pretested and include a free step by step assembly manual, software, one year warranty and our 24 hour supporuarder phone line. Assembly is available. ask for your free catalog CABLE T.V. CONVERTERS WHY PAY A HIGH MONTHLY FEE? INVESTIGATORS, experimenters — Quality new plans. Micro and restricted devices. Free catalog. Self addressed stamped envelope required K EL- LEY SECURITY INC., Suite 90. 2531 Sawtelle Blvd.. Los Angeles. CA 90064. BUILD: Infrared motion detector, ultrasonic dis- tance meter, long-range FM infrared transceiver. Complete plans. $4.00 each. K, KEMP, 13772 Gold- enwest St.. #549, Westminster, CA 92683. METAL project boxes - 50% off! Huge selection. Plus storage capacitors, amplifier kits, electronic parts. Free catalog. SCC, Box 551 RE, Dublin, OH 43017. PCB and schematic CAD software. Easy multilayer rubber band zoom pan and more. CGA EGA IBM compatibles S19S.00. NUMBER ONE SYSTEMS, 10565 Bluebird Street, Coon Rapids, MN 55433. KITS — alarms, games, and test equipment. Send $1 .00 for catalog. RAKJAB, PO Box 1875, Apopka, FL 32704. All Jerrold, Oak, Hamlin, Zenith. Scientific Atlanta, Magnavox and all specialized cable equipment available for shipment within 24 hours. For fast service MC /VISA or C.O.D. telephone orders accepted (800) 648-3030 60 Day Guarantee (Quantity Discounts) 8 A.M. to 5 P.M. C.S.T. CLOSED WEEK- ENDS. Send self-addressed Stamped enve- lopejeoc postage) for Catalog. |fnnuf&r ajMP POWERFUL single-chip FM room transmitter, size of a postage stamp, transmits to any FM radio up to one mile away. Complete kit $19.95 postpaid. HERTZ MICRODEVICES, Box 41771. LA. CA 90041-41771. PROJECTION TV. Convert your TV to project 7 foot picture... Easy... Results comparable to 52,500 proj- ectors... Plans and 8" lens S27.95... Professional systems available... Illustrated catalog free... MAC- ROC OM A, 15GE Main Street. Washington Cross- ing, PA 18977. Creditcard orders 24 hours. (215) 736-3979. THERE IS AN ANSWER IN SIGHT! MCM ELECTRONICS Been in the dark about where to go to find high-quality parts and components? This is your lucky day! Our GIANT new catalog contains more than 16,000 items, including over 3,000 RCA/GE parts plus the largest selection of Japanese semi- conductors in the Country. And our HUGE INVENTORY lets us ship 98% of all orders within 24 hours! Now, feel "enlightened"? For your FREE subscription to the MCM ELECTRONICS Catalogs, call TOLL-FREE 1-800-543-4330, jfOk MCM ELECTRONICS LmCmj 6 50 CONGRESS PARK DR. ^^^P CENTERVILLE, OH 45*159-^072 ^^^^ A PREMIER Company ISflClsA ^ \ -j.'^ ' J ,Jii SHEDS LIGHT ON PARTS PROBLEMS 1 ir ^TQO^ > z c > 3 SOURCE NO. RE-68 CIRCLE 87 ON FREE INFORMATION CARD 8! Cable Descramblers New Aulo Tri-Bi guaranteed no flashing SI6S.00 SB-3 ,. $99.00 ZENITH SUFER TRTMODE J 109,00 SAAV] S199.0O HAMLIN 199,00 TOCOM 5319.00 SCIENTIFIC- RAGLE S1I9.00 ATLANTA 5119.00 COPY GUARD S59.9J OAK M35B.... 599.00 STARGATE 2000... J88.00 ZENITH 5175.00 M.I). Electronics will match or beat any advertised wholesale or retail price. Your best buys and warranties for table converters and descramblers start with a FREE catalog from MD EXCELLERATOR CABLE CONVERTERS WHEN QUALITY COUNTS For Information Call 402-554-0417 To order or request a free catalog 1-800-624-1150 New Dynalrack™ fine tuning provides unmatched picture quality 550 Mhz tuner provides 83 channel capacity Sleep timer for automatic shut off within 15-90 minutes 2/3 switchable IIRC . IRC / Standard S .. i tellable 2 Year warranty, Last channel recall, Favorite channel select. Scan Double vented high efficiency transformer Tor cool performance Stargate-2001 $99.00 $targate-55GXL $119.00 With Volume Control Don't settle for anything less. i Mm<"hMmmmms^' IS H S c.o.d *£,. j3fr JiT^L UT JO « J »YCKDHtD«CAJiLJi WBTjUIFMINTlrTlE^ V^ <*£? Omaha, Nc 68T14 agrees to comply with all state an t> federal laws recajuxhg raiv ate V,***! *^%Sd* OWKIJSHIFGF CABLE TV EQUOTtlET. IF YOU AM ITNSlJIlEGFTircSE 3.AWS ^*?S^v*^ orECK wrn i your local csnctAis. CIRCLE 53 ON FREE INFORMATION CARD LASER lighting entertainment systems. Create your own 3 -dimensional laser light shows with these professional secrets! Detailed mechanical and elec- trical schematics, designs for any budget! $20.00. MILLENNIUM, 229 McAfee, Thousand Oaks, CA 91360. DAZER II. personal protection device! Plans $8.00. Lasers! Transmitters! Detectors! More! Kits or as- sembled! Catalog $2.00. QUANTUM RESEARCH, 16645-113 Avenue, Edmonton, Alberta T5M 2X2. PEN transmitter: Sensitive micro FM transmitter, housed inside standard size pen. Latest surface mount technology. Complete kit and instruction $44.95. MICRONIC-INT., Box 5726, Sherman Oaks, CA 91413. ANTIQUE RADIO CLASSIFIED Free Sample! Antique Radio's r Largest Circulation Monthly. [SBC^ Articles. Ads & Classifieds. 6-Month Trial: $13. 1-Yr: S24 ($36-1 st Class). A.R.C., P.O. Box BD2-L6, Carlisle, MA 01741 TRANSMIT VCR to any set in house. Inexpensive. No construction. Complete instructions. $4.00. VENTURA, Box 377, Beverly, MA 01915. EEPROM Programmer for the Commodore 64 PC. $8.00 for plans and autostart software. WILKIN- SON ELECTRONICS, Box 58261, Renton, WA 98058. DESIGN your own custom circuits with our user friendly electronic engineering software. IBM and compatibles. Commodore 64, and 128. Free infor- mation. Write or call today! WEASELGRAPHICS, PO Box 51697, Riverside, CA 92517-2697. Phone 1 (800) 356-8113 Visa'Mastercard. BIG screen 48" rear projection TV kit. priced 85% below commercial sets, easily assembled, factory parts, no electronic experience necessary, informa- tion 55.00. M. HOWE ENTERTAINMENT SYS- TEMS, PO Box 121-R, Swisshome. OR 97480. BEST BY NAIL Rates: Box 5, Sarasota, Fl 34230 OF INTEREST TO ALL JOURNALIST REVEALS SECRET 10 publishing books. $ 19. 95. Barrett. Box 1 1 34 1 ■( R E) , Cla ylon, MO 53105. EARN EXTRA CASH. Send '$3.00 to: P.O. Box 72067, C.C., TX 78472-2037. o z O DC I- O UJ _1 UJ 6 D < rr SURVEILLANCE — Audio/video/infra-red/ laser equipment. Industrial or private. 500 item catalog $7.00. SECURITY SYSTEMS, 3017G Hudson, Mew Orleans, LA 70131. PRO-2004/2005/2006 Owners! Restore cellular telephone, add-on S-meter, add 6,400 channels, increase scanning speed, auto tape record, etc! Manual includes 10 modifications with detailed in- structions and schematics. Only $8.95 from the EN- GINEERING WORKSHOP, PO Box 4176. Fullerton, CA 92634-4176 SURVEILLANCE electronics, plans, kits, as- sembled. Catalog $4.00. S4S ELECTRONICS, PO Box 36505-123, San Jose, CA 95158. THE CREATOR HAS A Name! Few people know it, Yel wonder why prayers arenT answered! Free information, Wrile: NAME. Box 2J42, Abilene, TX 79604. SATELLITE TV VIDEOCIPHER II manuals. Volume 1 - Hardware, Volume 2 - Software - either $34.95. Volume 3 - Projects/Software, Volume 5 - Documentation or Volume 6 - Experimentation $44.95 each. Volume 4- Repair $99.95. Cable Hacker's Bible - $34.95. Clone Hacker's Bible - $34.95. Catalog - $3.00. COD'S (602) 782-2316. TELECODE, PO Box 6426- RE, Yuma, AZ 85366-6426. K.D. VIDEO FOR ALL YOUR CABLE TV NEEDS WE SPECIALIZE IN DEALER PRICING 1 10 20 89.00 56.00 48.00 119.00 69.00 65.00 129.00 80.00 75,00 39.00 59.00 45.00 99.00 59.00 58.00 99.00 75.00 68.00 QTY Jerrold (Type) SB-3 Jerrold (Type) Tri-Bi Scientific Atlanta SA-3 Hamlin MLD-1200 OakN-12Vari-Sync Jerrold 550 Converter Jerrold 400 DRX-3DIC [With Built in SB-3) 169.00 109.00 100 00 1-800-327-3407 Call us for prices on large quantities K.D. Video PO Box 29538, Mpls., MN 55429 FREE catalog — Lowest prices worldwide, save 40 — 60%. Systems, upgrades, parts, all major brands factory fresh and warranted. SKYVISION, 2009 Collegeway, Fergus Falls, MM 56537. 1 (800) 334-6455. CABLE TV secrets — Ihe outlaw publication the cable companies tried to ban. HBO, Movie Channel, Showtime, descramblers, converters, etc. Sup- pliers list included, $9.95. CABLE FACTS, Box 711- R. Pataskala, OH 43062. PAYWANDSATELI.irEDESCIMMBl.ING ALL NEW . . . 1991 EDITION ... ALL NEW All new current Inlormalion. Build a scumblerrdescrambief camba.. Mare lurn-ons. bypasses lor wireless, cable and satellite. Daft reader, BAG s. Technical updaies Qn VCIk and B-MAC. Lots more Our Swat yel. $14.95. W 1 , vol B9 Si 4.95 each. Wireless Cable Handbook $9.95. BuiM SadHlile Systems untfer 5&0Q. $12.95. Any S3/$29 or $5/42. Scrambling Mews Monlh.rySl3.95/yr. Sample S3. New caialag St. Scrambling News, 1552 Herlei Ave., Bulfalo. NY, 14216 COD'S are OK 716-874-Z088 BUSINESS OPPORTUNITIES MAKE S50/hf working evenings or weekends in your own electronics business. Send for free facts. INDUSTRY, Box 531, Bronx, NY 10461-0208. YOUR own radio station! AM, FM, TV, cable. Li- censed/unlicensed. BROADCASTING, Box 130- F8, Paradise, CA 95967. INVENTORS: We submit ideas to industry. Find out what we can do for you, 1 (800) 288-IDEA. LET the government finance your small business. Grants/loans to $500,000. Free recorded message: (707) 449-8600, (KS1). CABLE DESCRAMBLERS OAK M3SB COMBO S3S.S5 Jerrold, Zenith, Hamlin. Sci. Atlanta, Pioneer & MORE! OUR PRICES ARE BELOW WHOLESALE! CABLE+PLU8 14417 Chase SI. #4B1-A Panorama City, CA 91402 1-800-822-9955 • Other Into. 1-818-785-4500 NO CALIF. SALES - DEALERS WANTED MAKE $75,000 to $250,000 yearly or more fixing IBM color monitors (and most brands). No invest- ment. Start doing it from your home. (A telephone required.) Information, USA, Canada $1.00 cash. US funds, other countries $8.00 RANDALL DIS- PLAY, Box 2168-R, Van Nuys, CA 91404 USA LOW power radio broadcasting. Your own business. Unlicensed. — licensed — legal! Complete details! SOUTHEASTERN TECHNICAL SERVICES, Box 8, Stonewall, OK 74871. PROJECTION TV,,, Make S$$'s assembling proj- ectors. Easy!... Results comparable to $2,500 proj- ectors... Plans, 8" lens & dealers information $25.50... Professional systems available... Illus- trated catalog free. MACROCOMA, 15GEX Main Street, Washington Crossing, PA 18977... Credit- card orders 24 hrs. (215) 736-2880 90 LEARN to clean/repair fax machines. Huge new market! Earn $85/hour. No experience necessary. Free details call 1 (BOO) 537-0589 or write tO:VIEJO PUBLICATIONS 5329 Fountain Ave., Dept. FX200, LOS Angeles, CA 90029. EDUCATION & INSTRUCTION MAGIC! Four illustrated lessons plus inside infor- mation shows you how. We provide almost 50 tricks including equipment for four professional effects. You get a binder to keep the materials in, and a one- year membership in the International Performing Magicians with a plastic membership card that has your name gold-embossed. You get a one-year sub- scription lo our quarterly newsletter "IT'S MAGIC!" Order now ! $29. 95foreachcourse+$3.50postage and handling. (New York residents add applicable slate and local sales tax) THE MAGIC COURSE, 500-B BiCounty Boulevard, Farmingdale, NY 11735. F.C.C. Commercial General Radiotelephone li- cense. Electronics home study. Fast, inexpensive! "Free" details. COMMAND, D-176, Box 2824, San Francisco, C A 94126. TUBES - 2000 TYPES DISCOUNT PRICES! Early, hard-to-lind, and modern tubes. Also transformers, capacitors and parts for lube equipment Send $2.00 for 28 page wholesale catalog. ANTIQUE ELECTRONIC SUPPLY 6221 S. Maple Si. «Tempe, AZ S5238 • 602J820-5411 ENTER THE WORLD OF PROFESSIONAL VID- EO! Pros tell techniques and secrets of U-matic VCR's 32 pg. Illus. Send $12.95 to ANIBAL NEGRON, tHMason Blvd., S.I., NY 10309. LEARN IBM PC assembly language. 80 pro- grams. Disk $5.00. Book S18.00. ZIPFAST, Box 12238, Lexington, KY 40581 -2238. CONSUMER advocate. Help sources, any problem. SASE for description. HELP, Box 132, Indian Rocks, FL 34635. MOVIE VIEW SALES Cable T.V. Converters Descram biers / Low Prices PO Box 26 • Wood Dale, !L 60191 (708) 766-5222/Fax (708) 766-5269 Call CST Mon.-Fri. - 9-5/ Sat.-10-2 JERROLD - SCIENTIFIC ATLANTA OAK • ZENITH • HAMJN • PIONEER Converter Only • Hand Helds Ch. 3 Fillers • 3 Ft. Jumper Cable Si VISA/Mastercard EDC.O.D. g] Friendly Knowledgeable Service [3] 10 Yrs. Experience \ti 6 Mos. 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Hamlin Combos $44, Oak M358 $60 (mtn. 5), etc. WEST COAST ELECTRONICS For Information: 818-709-1758 Catalogs & Orders. 800-628-9656 MRRK V CLCCTRONICS, INC. Competitive Pricing :|: Fast Shipping Since 1985 ORDER IN CALIFORNIA 800-521 -MARK ORDER OUTSIDE CA 800-423-3483 FREE CATALOG & INFORMATION {213)888-8988 FAX (2131 888-6868 . indicates the level of difficulty in the assembling of our Products. TA-120MK2 A Begin ner A.A Intermediate AAA Advanced * Fully Assembled V"' SM-49, Jl ■SM-333| AMPLIFIERS KIT ASS t MB. SM-666 metal cabinet Free gill for any purchase before April TY-43 MODEL TA.28MIC2 TA-50AIFJ TA-50C r*-120MK! "4-3-M SM-302 IA323A TA-377A TA-400 TA-477 TA-SDGMK2 TA-802 TA-S20A TA-10O0A TA-I5O0 TA-2200 TA-2400A TA-2500 TA-28O0 TA-3000 TA-36O0 DESCRIPTION Dtoilal Voice Memo AA Multi- Purpose Me do* Generator A Mu iti- Purpose Melody Generator a 35W Class 'A" Main Power Mono Amp AA 30W Multi- Purpose Sioor* Channel Amp: A 60W . 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Stereo Simula lor I Foe Mono TV or Arty Mono Source) AA . 300W" no Mi-Fr Power Mono Amp AAA ___._ ..+890 27 00 -.85.00 17.20 1871 i2 30 2900 78 00 4280 75.00 34.93 35,00 5972 4937 SO SB 95.81 58 21 9G00 58.80 63.57 3350 ■■10 00 POWER SUPPLIES KIT A5SEMB TR-1 00A 0-1 SV 2A Regulated DC Power Supply FWrCase] * m -355A 0-1 5V 5A Regulated DC Power Supply A __-_ , TR-355B D-30V 3A Regulated DC Power Supply A TR-503 0-5CV 3A Regutaled DC Power Supply A A - S S60SD ... 15.65 31 76 .15 65 2176 . 16 75 23-68 MISCELLMiEGUS KIT ASSEMB. MODEL TY-23B TY-25 ry-35 TV-36 IV-38 TY-41MK.V ty-42 W-43 TY-45 TM7 sum SM-32S SM-333 SM-666 51.' 3S! 10.000*1/1 DESCRIPTION 3 Channel Color Light Controller i SlereD Loudspeaker Projector A f M Wireless Microphone A . AC'DC Duartz Digital Cbclc J Sound 1 Touch Control Switch A . littered Remote Control Unit I vWCase) AAA Bat i Dol Level Meier A A 31i Digital Panel Meter A 20 Steps Bar I Dol Audio Level Disoiay AA . Superior Elect ronic Roulelle AA . 7 Band hi-fi Graphic Eguamr AAA 4 Chartntl PrDlessional Color Ugtn Conlroller* AudrtvVideo Surround Sound Processor aaa* Dynamic Noise Reduction A tjniveTjai Audioruideo KARAOKE Maer. Pr&.Amp. * 80 V Capacitor (Suggested lor TA-3600. TA-477. TA10DOA S IA-802) ..14.85 .1115 . 19.00 . 12.00 .22.00 24.15 29.00 .38.45 -1946 26 80 ~8S0O 26 00 S 65.00 2085 26 20 35,00 33.31 3*00 46.14 J7J24 3B80 145.00 75,00 34 00 225.00 23 00 METAL CABINETS WITH ALUMINUM PANEL MODEL H' J W t D' MATCHifJQ LG-1273 LG-1684 ID -1924 LG-1925 IG-1983 12" 7" TA-2800. TA-377A. FA-22O0 16' 8' 7A-323A. 7A-377A TA-2200 19 1 1 V, TA-802. TA.S20A. TA- 1 5O0,T*1 20MK 2. TA-800. TA-1 000A , , tr 1 1 14 TA-477, TA-800. TA- 1 500. TA- 1 000A IA-3600 'If 8- TA-3 J 7A TA-2800. TA-22O0. 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' ^^JL^L l■ ^L ■ l « Jl. | ■ i■■^J^ ^ ^^MJ■^., l l^ !^ l■^J■. ■ ^ ll^ ^u■■f ■ ^ ' iJ l! ■J. l J■ ■■ rli^l■ ! .B:^ ^^^ .^■^l l l-^■J. ! ^ l ■ l ^ l ■l'■. l ^ hUSirTwi S3 OOfi-xi ih-p dv US fia* »U5 PHFD^a^Vt^u^satCtiriinTi,^ *MaiiMrt*^ i jnftriirta30iU^wa.rFj 1 hry*Cr^ r Uit PraUt dt« ^tf«ti tacnan9t nMhoyi pr>or *Q(*>u W» .'-■ - ■' . ■■■■■ ■■-:■ '.,i-^y is & Showroom hours [raciftc iime) Mon. thru Ffi 9:30 am to 5:00 pm Sat, 10:00 am to 5:00 pm MARK V ELECTRONICS, INC. - 8019 E. Slauson Ave, Montebello, CA 90640 -^- E3 [i^i CIRCLE 93 ON FREE INFORMATION CARD GRA1- u, 1X7- = *RUB4 - crtpBTC5 — SESMCF1- 25LLS1- OT EH1- Jg EHL1 - 3JL3- SFJ5- Q_ LEVI - ANTI GFWflTY GENERATOR *0 WfflT BURNING CUTTING LASER HI PWER PULSED CALLING LASER 1 MILLBN VOLT TESLA COIL . HI VELOCITY COIL GUN . . . . LASER LIGHT SHOW 3 METHODS .... 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THE JOY OF PROGRAMMING! i\lgoriiuii THE PERSONAL PROGRAMMING NEWSLETTER ► features how-to projects for beginners and experts: fractals, moire patterns, ecological simulations, black holes, sand-piles, wallpaper for the mind and much more! ^ Write today for a free sample issue to: Algorithm - Special Order Deo oilmen I P.O. Bo i 29237, Weitmount Postal Outlet 785 Wonderland Rood South London, Ontario, CANADA N6K 1M6 CABLE BOX REPAIR JERROLD 400 opportunity CATV repair manual. DRX-3DIC-105 cable converter. CAD drawings, circuit schematics, microprocessor pinout, parts list, parts available S14.95 +$2.00 P&H. Rush US PO money order, cash or check to BONDED CABLE T.V. CO. PO Box 20340 Dept. RM * Fax (313) 548-0053 Ferndale, Ml 48220-9998 U.S.A. ' No COD. CO O Z o rr h- o HI _i LU o 5 < cr: 92 2-1/2" SANYO TWEETER Paper cone with gold tone dust cap. Soz. magnet 8 ohm. i/2"ferro l-uid voice coil Power handling; SOW RMS, 70 W max. Frequency re- sponse: 3K-20KHz. #RB-271-Q20 $1 95 $1 TS 95c |l-#l (tO-M] (W-ufii SUPER HORN TWEETER Original pie20 tweeler made by Motorola. SPL=94dB2-83W1M. Response: 4KHz- 27KHi. Handles ap- proximately 50 waits. #RB-270-010 £f $5* $4 M $3" MQ-J'V) i.M-lCH 2" DOME MIDR ANGE Textile dome midrange made by Philips. 8 ohm. SPL=90dB 1W/1M. 30 W RMS. 40W max Response: 55Q-5KHz, #RB-28O210 540 E. First Sr.. Dayton. Local: 1 -SI 3-222-01 73 FAX: 513-Z23-4C44 15" SUBWOOFER * Dual voice coil. 40 oz. magnet. 6 ohm imp. 100W RMS, 140W max. Response: 20-i.2KHz. Resonant frequency: 21 Hz. SPL«93dB 1W/1M. #RB-29O-190 $54* t < 93 CIRCLE 188 ON FREE INFORMATION CARD Welcome to. . . SCIENCE PROBE! — the only magazine devoted entirely to Amateur Scientists! If you are fascinated by sci- ence in all its many forms ... if you can't stay away from a microscope, telescope, calipers, or test tube — we invite you to share the wonders in every issue of SCIENCE PROBE! You will join a community of Amateur and Stu- dent Scientists who enthusiastically seek scientific knowledge or follow sci- entific pursuits for their own sakes and not merely as a profession. Obtain your personal premier edition of SCIENCE PROBE! by visiting a quality Newsstand, Convenience Store, or Su- permarket this Fall or by reserving your personal copy through the mail by completing the coupon below. From the very first issue of SCIENCE PROBE! you will be involved in a world of scientific facts, experiments, and studies pursued by amateur scientists who are university students, inventors, academicians, engineers, or office workers, salesmen, farmers — whose quest is to probe into the mysteries of science and reveal them to all. Plan to become a SCIENCE PROBE! reader! SCIENCE The Amateur Scientist's Journal Embark on an irresistible new journey into the realm of mystery, challenge, and exploration! The perfect magazine for the budding scientist, the serious amateur, the professional who would like to relax, and those who simply want to gaze at the stars. Articles to appear in early issues of SCIENCE PROBE! are: LIGHTNING— CAPTURE IT ON FILM MONITORING ULTRAVIOLET FROM THE SUN MOBILE-MOUNT EXPERIMENTAL WIND TUNNEL CHECKING OUT ACID RAIN AERIAL PHOTOGRAPHY FROM KITES AND BALLOONS MINIATURE TRACKING TRANSMITTER KILLER BEE IDENTIFICATION HOW TO OBTAIN ANIMAL EYESHINE PHOTOGRAPHS If you're fascinated by science in all its many forms, if you are compelled to experiment and explore, then SCIENCE PROBE! is your kind of magazine! SCIENCE PROBE! 7 RA1 1 500-B Bi-County Boulevard Farmingdale, NY 11735 Please forward my Premier Edition of SCIENCE PROBE! as soon as it comes off the press. I am enclosing $3.50-U.S.A. ($3.95-Canada) plus $1.00 for shipping and handling. Better still, please enroll me as a charter-member subscriber and send the next four (4) quarterly issues of Science Probe. I am enclosing $9.95-U.S.A. (Canada: $14.95 U.S.A. Funds) □ Premier Edition only D First Four Issues (1 Year) Offers valid in the U.S.A. and Canada only. No foreign orders. Name Address City__ State ZIP All Orders payable in U.S^A. Funds only. ON SALE AT QUALITY NEWSSTANDS, CONVENIENCE STORES AND SUPERMARKETS STARTING SEPTEMBER 13, 1990 — $3.50-U.S,A. — $3.95-Canada QUALITY PARTS - DISCOUNT PRICES • FAST SHIPPING miMMMmmm DIGITAL CLOCK AND APPLIANCE TIMER igilal dock and appliance ■nor removed Irom automatic oclrc coifs* matters due i design changes. Operates n 120 Vac and fe capable I turning on appliances rawing up to 10 anps. accuse of I he application they were designed h ihey automatically turn a'l after two hours, ome have surface blemishes. 4.2" X 2,45" X ,1" deep r Bsige or rvory with brown trim CAT*MCT $6.50 each CIRCUIT BOARD PEN 53Q Circuit Works # 2200 Make and fix circuit board lines instantly, Valved pen with a specially formulated silver bearing thermoplastic polymer allows you to draw conductive silver traces. Can be soldered after 15 or 20 minutes with 350 degree Iron. Each pen contains enough silver conductor for 100 leel of shielding, traces and connections. Traces are as narrow as 1/16' In width, CAT# CW-22O0 ST 0,95 each 150 MICRO AMP METERS; 150 mlcroarrp lull seals 2.165- X 1.875" X 0.96- deep Face Is 1.965" X 1.1", While badtg round with black and red scale. Two types. One Is marked ' Modulation- and has a - 1 Do scale. The other has two scales, "RF" and "SWR". Otherwise meter are Identical. "Modulation" meter CAT* MET-21 13.50 RF/SW Ft meter CAT* MET-22 J3.50 sONE MINUTE TIMER This white box with a blue button will drive you crazy. Box measures 3 1/4' square X T high. When the button l« pressed 4 LED* light and a Deep- er pulses. Every 1 5 seconds one led goat out and the speed of the beeping Increases. At the end of SO seconds the unit gives off a Jong beep followed by a low squelch, all LEDs shut off and the unit stops. UnK requires a 9 volt transistor battery [not included) to Operate. CAT#TMR-1 $2.25each - lOforft&GO SWITCHES w SPDT PUSHBUTTON 'dfo.-qunndie 1 943 Rated 6 amps & 1 25(250 Vac. Black plastic pushbutton. Switch body: .92- X .94- X .65". CAT* P8-1B S1,65e». -10 for $15.00 PUSHBUTTON SWITCH GC/Thomsen* 35-420 5.P.S.T. normally open momentary pushbutton switch. Red plastic actuator 0.57* diameter. Chrorw bezel U.BS" diameter. Threaded bushing mountain .50" diameter hole. Rated 3 amp ® 25QVac. So'dor loop terminals. CAT* PS -20 H.OOeaeh THUMBWHEEL SWITCH 1 poto 10 petition jSfc doctrnal *ncod»d >* *■ gvvrt-ttot which f interlock |d maks up desired number or digit*. Tflrminatwto It pc prna (1 com- mon and 10 poles). Each, section measures .31" wide X .20" high X .76- deep. End plates can be added to form a .04" , ih beuL CAT-SWTH-fl $1 ZL «ch lOforelO.OO 2 END PLATES - CAT* SW-&EG S1 OOvSet MINIATURE TOGGLE SWITCH Raeod : 3 nrnps <& 1 20 Vac S.P,S.T. (ON-ON) wider lug* CAT#HTS-4 Sl35*Bcfi S.P.S.T. (ON-ONJ PC rrvwnl CAT* MTS-4PC 31 OOftach 4 WALL TRANSFORMERS %) ALL PLUG DIRECTLY INTO 120 VAC OUTLET 6 Vac ® 600 ma. CATIACTX-660 53.50 8 3 Vdc

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New cables manufactured for IBM PC net- works ISM PnV 1 501908 COWS COPE CAT*RG-11-1 10011 roll $15 00 CAT*R0-11-2 ZOO It roll S27. 50 LED'S STANDARD JUMBO DIFFUSED T1-3Meiie<5mn) ffED CAT*LED-1 irjlwtiso -looter sum I OREEN CAT* LED-2 10 lor 12.00- 100 lor (17.00 YELLOW CAT* LEO-3 IOIortJ.00 • 10Ctort17.n0 FLASHING LED with built in Resting Grnll 5vDltopanibpn. T t-^4 (5mm) BED (1 00 each CATI LED-4 1-0 Ic.-M [:■: ,^ OMEH CATI LED-4C $1 .00 each ■ 310kK$v.5C # SI 00 aadi | [ VELIO IV CAT*LE0-4YlOhirSv.5O LED HOLDER a Two piece holder. ■* & CAT* H LEO 10 for 65e ;photo; RESISTOR 1 00 BnBH bright light ^^ 1»K ohms dirk. U 0.1 42" dia X .OS-high. 1 9' long IHde CAT1PRE-T 2 for $100 100 lor $45.00- 1000 tot $400.00 OPT0 SENSOR dottfXl optical Switch "Ltt 1/8* gap ba&iwwn lid«4. 75' mciL-ri-tiFvj .:ar\\*itz CAT(f OSU-7 2 Mil 00 REFLECTIVE OPTO SENSORS Thrtjsi uniti hAvt an IR *fnietw and uncor pair poinlin-g n Tha *am » dtftcti wi , Light from Bnrittar bounc** off etojffct lo b* detected by awn tor Eff IrCtiv* rartg A appro* . 0.15* TT-ifae Types ova liable ' TRW/ Optron j—y*. wr 23" wire loads CATIOSR-4 2 lor $1.00 [~~^0 ' OP8703A EC-^ W«lgesh>pe iMlh PC pins CATIOSH-3 75c ucn TtW« OpionI OP871 1 Rectangular with PC pins. CAT* OSR-2 75c < act! ■"Z&mM LASHER :KrfS TwoL.E.D.'aflaah in ^it y ^ f unison when a 9 wH ^~ij^H^ s=at \ battory it ■tlacned, £ — ^^-— -^ Thhs kc[ incluiias a <^^~' pc. board, all tlw parts and insimotions to make a sifT-pto flasher circuK. A quk* and oasy proj«ctfor any- one with basic so id ft ring skills. CAT* LEDKIT SI 75 p«r kit LED CHASER KIT v^ ^\ Build ihtsvanabkt spo&d ledchasor DJlXJLiii^^-lUt sequentially at whatever sp*wd you a*5t lh»Fn tor. Easy lo build kit ineluttes pc board, parts and instructoris. Ideal lor special lighting effect? , costumw, *tc Operates on 3 to 9 vorta, PC board is 5' X 2.25". A great one hour project CATdAEC $6 50 each ^STEPPING MOTOR; CONTROLLER KIT Leam abcM slopping motors while building th$s slmpte circuh. Indudos circuit board, slopping motor and all parts except 1 2 Vdc power supply. CATtfSMKIT lie.OOeach 12VDCGEARHEAD MOTOR . : ; ; rc^ Soho»GBL35-OH-21 080- 1 0¥ Powerful little geathead motor. 40RPM® 12 Vdc. O.Sarrps [no load], 32 RPM wilh load. Operates at lower vohages wilh reduced spMd and Torque. 6.3 pound inches torque. Stall: 27 pound Inches. 3.1" long X 1 .375" diameter. Shaft: 0.187" dia X 0.7S- long. CAT* MOTG-14 $11.60 each • 10 (or $100.00 XENON TUBE 1" long tiaBhtube with 3 1/2" red and track leeds. Ideal for flath or strobe i.r -m. „-i.l CAT* FLT-3 2 1c SI PC- ORDER TOLL FREE 1-800-826-5432 FAX (818) 781-2653 • INFORMATION (818) 904-0524 Call Or Write For Our Free 60 Page Catalog Outside the U.S.A. send $2.00 postage for a catalog. Minimum Order $10,00 • Ail Orders Can Be Charged To Visa, Mastercard Or Disco vercard * California, Add Sales Tax • Shipping And Handling $3.50 For the 48 Continental United States - All Others Including Alaska, Hawaii, P.R. And Canada Must Pay Full Shipping * Quantities Limited • No COD. • Prices Subject to change without notice. MAIL ORDERS TO: ALL ELECTRONICS CORP - P.O. BOX 567 • VAN NUYS, CA 91408 CIRCLE 107 ON FREE INFORMATION CARD K Freedom of Choice aissssfe* GoldStar 20MHz Oscilloscope Jameco Universal IC Programmer Memory Devices: EPROMS, EEPROMS and PROMS Logic Devices: PALs h GALs, RALs t EPLDs. EEPLDs and FPLDs Features: - 6" rectangular CRT display, interna! gratitude & scale ■ Phase difference measurements between two forms under two methods: K-y scope and Dual Trace ■ Two different scale probes: x1 and x1Q • Bandwidth Irom DC to 20MHz * Includes: Two 40MHz probes, two fuses, power cord, operation manual, schematics arid block and wiring diagram ♦ High sensitivity; "ImV/dlv ■ Two-Year Warranty GS7020 $499.95 Jameco Logic Pulser ■ Compatible with TTL. DTL RTL. HTL. HN1L. MOS and CMOS ICs. • 1M£I Sync iipu: impedance ■ Putser mode output current: 10mA * Square wave current output: 5mA * Audible lone Jameco Logic Probe ■ Max Frequency BOMHz • Minimum delectable pulse: 10ns • 120KU input impedance ■ Max, supply vollage: »25V ■ TTL threshold: (Lo)->D.aV :0.1V (Hi) .2.3* 10.2V ■ CMOS threshold: (Lo) 30% VCC ;10% (Hi) 70%VCC =10% LP540 $16.95 MS104.... $24.95 PROTOTYPING PRODUCTS Jameco Solderless Breadboards Metex Digital Multimeters Pirt MO. L'lV Contact Binding Points Posts Price JE21 JE23 JE24 JE25 JE26 JE27 3.25 i 2.125 S.SI2 12E 6.513.125 6.514.25 6.875 X 5.75 7.25 1 7.5 400 S30 1,360 1,660 2,300 3,220 $4.95 $6.95 2 $12.95 3 $17.95 4 $22.95 4 $32.95 J AMECO 24 Hour Order Hotline (415)592-8097 FAX's: (415)592-2503 or (415) 595-2664 General Specs: ♦ Handheld, high accuracy ■ AC/DC vollage, ACyDC current, resistance, diodes, continuity, transistor hFE ■ Manual ranging w overload protection M3650 & M4650 only: » Also measure frequency and capacrtance M4650 only: " Data hold switch - 4.5 Jig ii M3610 3.5 Digit Multimeter $59,95 M3650 3 .5 Digit Mufester w.f reuoency S Capacitance $74 .95 M4650 4.5 Digit w Frequency CapaolarKS and DataHoaswildi S99.95 Handheld Multimeter 3 5 digit LCD with automatic polarity indication • AC/DC vollage measurement up lo 500 volts ■ AC DC cunent measurement up 10 200mA ■ Resistance measurement up lo 20Mfi * Continuity checker with audicte tone - Diode and logic tester * Auto'manual range and data hold functions ■ All range protection and iunolion indications DMM905 $49,95 • Stand alone or computer controlled mode via RS232C port • The JE680 uses the JEDEC standard for logic devices. Accepts input from virtually all major software packages including: PALASM, PLAN, CPU L, ABEL, and AMAZE JE690 Universal IC Programmer $1795 JE680-40P 40-pin MPU Adapter Module (8741.8742, 8748,8749,8751) $14 A.R.T. EPROM Programmer ■ Programs all current EPROMs in the 271 6 to 27512 range plus the X2S64 EEPROM •RS232 port • Software included EPP $199.95 UVP EPROM Eraser * Erases all EPROM's • Erases 1 chip 15 minutes and 8 chips in 21 min - UV intensity: 6800 UW/CM 2 DE4 $79 EPROMs - for your programming needs Part No. _P_ri££ Part No. Price TMS2516 TMS2532 TMS2532-35 TMS2532A TMS2564 TMS2716 1702A 2708 2716 2716-1 27C16 2732 2732A-20 2732A-25 2732A-45 27C32 4.95 6.95 7.49 7.95 5.95 5.95 4.89 6.95 3.49 3.95 4.25 4.95 3.95 3.75 3.49 3.95 2764-20 2764-25 2764-45 2764A-20 2764A-25 27C64-15 27C64-25 271280TP 27128-20 27128-25 27128A-15 27128A-20 27128A-25 27C128-15 27C1 28-25 272560TP 4.95 4.75 4.49 4.25 3.95 4,49 3.49 4.95 6.95 6,25 6.95 5.95 4.95 5.95 5.75 4.95 Part No. 27256-15 27256-20 27256-25 27C256-15 27C256-20 27C256-25 2751 20TP 27512-20 27512-25 27C512-15 27C512-20 27C512-25 27C010-15 27C010-20 68764 68766-35 Soldering and Desoldering Stations 60 Watt Analog Display Soldering Station - Electronic temperature control from 200" to 878°F • Cartridge heat- ing element for a longer life of the soldering tip XY1683 $69.95 30 Watt Electronic Temperature Controlled Desoldering Station - Electronic temperature control from 212" to 842° F • Self contained high rotary vacuum pump XY999 $299.95 96 • Partial Listing • Over 4000 Electronic and Computer Components in Stock! CIRCLE 114 ON FREE INFORMATION CARD 24 Hours a Day. ;od^ nooe o\s o-«S?SS55 and £\ec Assemble Your own Computer Kit! Jameco 16MHz 80386SX Desktop Computer Kit jilding your own computer provides you with a better understanding of •mponants and their functions -depth assembly instructions included ave your new computer assembled and running in an evening, ling common tools jftware included jrchase computer kits configured by Jameco or design your own ameco 16MHz 80386SX esktop Computer Kit ludes: 03S6SX Motherboard with MB RAM (expandable to 8MB) 01 -key enhanced keyboard lulti I/O Card oshiba 1 ,44MB. 3.5" DSHD oppy disk drive laby sized desktop case GO Watt power supply )R DOS (Version 5.0) by )igital Research and Diagsoft's iAPIus diagnostic software ^ £38 16 ■95 Hard Drives Conner (16-bit IDE) CP3044 40M8 3.5" Low PioNIb $469.95 CP31 84 eOMB 3.5'HH $699.95 CP3104 100M B 3,5'hU. „...$7 99.95 $29.95 A DP 20 Hosl Maple:... Relisys14" VGA Color Monitor J AMECO 24 Hour Order Hotline (415)592-8097 FAX's: (415) 592-2503 or (415) 595-2664 1355 Shoreway Road Belmont, CA 94002 Look to Jameco • Max resolulion: 720 x 480 • Bandwidth: 30MHz • Tilt/Swivel base RE9513 $449.95 Jameco 16-bit VGA Card ■ Supports VGA, EGA, CGA, MDA and Hercules modes - Comes with 256KB video RAM upgradable to 512KB (eight 41 464 -B0) • Capable of 640 x 480 with 256 colors. 800 x 600 with 16 colors VG2000 $149.95 irt No. Integrated Circuits 1-9 10+ Part No. Jb9 lfl± (LS00 ILS02 ILS03 ILS04 1L505 ILS06 ILS07 4LS08 «LS10 4LS11 4LS13 4LS14 4LS20 4LS21 4LS27 4LS30 '4LS32 ■4LS38 •4LS42 '4LS47 '4LS48 r4LS112 MLS122 74LS123 74LS125 .25 .25 .25 .25 .28 .59 .59 .28 .25 .29 .35 .49 .28 .29 .35 .28 .28 .35 .49 .85 .85 .39 .55 .49 .49 .15 .15 .15 .15 .18 .49 .49 .18 .15 .19 .25 .39 .18 .19 .25 .18 .18 .25 .39 .75 .75 .29 .45 .39 .39 74LS154 1.29 1.19 74LS155 .49 .39 74LS156 .49 .39 74LS157 .45 .35 74LS158 .39 .29 74LS166 .79 .69 74LS169 .99 .89 74LS173 .49 .39 74LS17S .39 .29 74LS181 1.39 1.29 74LS189 3.95 3.85 74LS190 .59 .49 74LS191 .59 .49 74LS193 .69 .59 74LS194 .69 .59 74LS221 .69 .59 74LS240 .59 .49 74LS241 .59 .49 74LS323 2.49 2.25 74LS541 1.09 .99 74LS590 5.95 5.75 74LS670 .39 .79 74LS688 2.19 1.95 81 LS95 .99 .89 81 LS97 .99 .89 Miscellaneous Components Potentiometers Values available (insert ohms into space marked "XX'): 500Q.1K. 5K, 10K. 2QK, 50K. 100K, 1MEG 43PXX 'ttWatl.lSTum 99 63PXX V2Wati, 1 Turn 89 Transistors And Diodes PN2222 12 PN2907 12 1N4004 10 2N2222A 25 1N4735 25 2N4401 15 2N3904 12 1N4148 07 1 N751 15 1 2N3055 69 C106B1 49 llN27Q 25 Switches JMT123 SPOT. On-On (Toggle) 1 .25 206-6 SPST, 16-pin (DIP) 1.09 MPC121 SPDT.GnOtf-On (Toggle) 1.19 MS-102 SPST, Momentary (Push-Buttoni 39 D-Sub Connectors and Hoods DB25P Male, 25-pin 65 DB25H Hood 39 DB25S Female, 25 -pin... .75 LEDs XC2Q9RTl.(Red) 14, XC556R T1 3m, (Rett) 1 2 XC556GT13/4, (Sreen) ...16l XC556V T1 3 w, (Yellow). ..16 Low Profile 8LP 11 14LP 12 16LP..... 13 24LP 19 28LP 22 40LP 28 IC Sockets Wire Wrap (Gold) Level *2 8WW .49 14WW... .....65 16WW 69 24WW ........1.05 28WW 1.29 40WW 1.79 Soldertait Standard & Header Plug Sockets Also Available • Wide selection of integrated circuits and components • Quality prototype and test equipment ■ Computer kits and accessories Additional items that Jameco offers: ■ Motherboards • Memory • Math Coprocessors ■ Computer Accessories • Tools ■ Cables ■ Connectors ■ Data Books • Power Protection Equipment » Much, much more ! Let us show you what we have to ofter; call or write lor the latest Jameco catalog! $50.00 Minimum Order Data Sheets ■ 50c each For a FREE 90-Page catalog send 52.00 to cover first Class Postage and Handling ©1991 Jameco Electronics 1191 CA Residents Add 6.25%. 6.75% of 7.25% Sales Tax Shipping - Add 5% plus £1 .50 Insurance [May vary acceding la we-ghi and sh:pp ng rcujitiod) Terms: Prices subject to change without notice . Items subject to availability and prior sale. Complete list ot IflmiS'Twarranties is avaitatrie upon request. IBM n a '¥$ ilareo IradtmarV ol InFeroscm* Buwnm M*crur*ti MMC <£5S» Please refer to Mail Key 2 when ordering • Customer Service 'Technical Assistance 'Credit Department *AII Other Inquiries «(41 5) 592-8097 * 7AM -4 PM P. ST. CIRCLE 114 ON FREE INFORMATION CARD C > 33 -■: 97 3 FORI SPECIAL ON SUB-MINIATURE VOICE FM TRANSMITTERS. KITS CONTAIN PC BOARDS •FMX-1 LONG RANGE (3 Ml) ULTRASENSITIVE FM VOICE XMTFt with fire tune, range control plus S34.50 *TELX-1 TELEPHONE FM XMTR (3 Ml) auto- matically operates when phone is used. Crystal clear clarity with tine tune and range control. Non detectable ....S34.50 •ATR-1 AUTOMATIC TELEPHONE RECORDING DEVICE tapes telephone conversation all automatically $19.50 ALL THREE OF ABOVE FOR S69.50 CALL OR SEND VISA, MASTER CHARGE, MONEY ORDER.ETC. TO AMAZING CONCEPTS, BOX 716, AMHERST. NH 03031. (603) 673-4730. ADVERTISING INDEX ■^Es ■ ■ %mbt- MINI GEIGER COUNTER Detects ALL Types d Radiation Uses Sereiiwe Jypha Window Tute Operates from 9J Baltaiy (nul Incl.) Cfimes will, PC Bead. Parts. Tute and IrtslrijcEigrtj Siffi dj PC Board: 3"x1.9r C6430 $59.95 1KV TRIGGEK COIL Llse-wilti any^robs lutt M reeds a 3 fesHfcV bigger. ^^ N170O $L25 EA. 100 Ear $80,00 JP. V*. INVERTER j-y TRANSFORMER (|fl Strati 4 Ie33 traretomer tor ua wl?i 555 C to convert IZlDC iq 250V l» snobs/ Huorescert lutes wfli scfemaiic N17Q3 S2.00 EA. 1.000 lor S1.5P0 o z o cc r- o LU o < 98 CDS CELL ASSOR' Great rrji Hundreds ol prajcas and MOerimenls. Tttese change' liteir resissamce light. 5 djflnenl types. \\ G764 5 lor $2.00 GIANT HORSESHOE XENON STROBE TUBE/ Largsst itorsesftw Tute we neve ever seen! Make a oehemDUIh saote to irkysw everyare on Hai- sr.. cr LG! i "i a wlopoy dI a disco susbel Site 2' toil i HAT wide, glass tubing d1a_ 5/16' Opiates on 30uvDC and can be .1^3 «toi our *-.V trigger Pats- ktrw (SUCH KlTtO to IHt) G762 $7.00 EACH RARE EARTH MAGNET? Many limes sttDHcer than due rnarjrttfs, trese are airsung the wotfcTs sporgei camirHpially avail- able nagrms lor Wis siie, Stnan sin only atBJ I.6T' i W i M' yd ran lit up to 10 IbL Try la remove litis magnet liotn a steel ptie. and youi i i^o mpness you siide^.vcu can on iitai Grea lot thousands of experiments art apptca- iws Normally trea sell lor over SGO earA col mese are stxpos and inve a tw chijB(does not (Dad peiotmane) G765 $9.00 MIN1P.UM ORDER: $10.00 pijs $3.00 shipping and handing We accept MC visa and Money Orders SEND ORDERS TO: The Eletlronc Goldmine P.O. Box 5408 ScotlEdale. AZ 85261 PHONE ORDERS: (602 1 451.7464 CIRCLE 176 ON FREE INFORMATION CARD RADIO-ELECTRONICS does not assume any responsibility lor errors that may appear in the index below. THE ELECTRONIC GOLDMINE tlte Electronic GoMmlni has one of the greatest se- lections ot uniox ptecstunic lots available in the wrttK We lava over 130 Ms and over 1,400 unique, ttaroain phcod, cumconstts cur catalog! Free tos 75 107 84 67 98 109 70 54 180 58 181 186 127 176 121 182 86 187 114 115 87 53 93 61 117 183 56 Information Number Page AMC Sales SI Ace Products 29 All Electronics 95 Amazing Concepts 92 Appliance Service 29 Banner Technical Books S3 Beckman Industrial 9 C&S Sales II CEI , 93 CIE 7,21 Chemtronics .83 Command Productions 20 CompuServe CV4 Cook's Institute 82 D&D Electronics 74 DELPHI 74 Damark International 70 Deco Industries 29 Electronic Goldmine 98 Electronics Book Club 76 Fluke Manufacturing CV2 Friendly Videos 86 Global Specialties. 3 Grantham College 10 Heathkit 71 Huntron Instruments 73 Information Unlimited 98 ISCET 86 Jameco 96,97 Jensen Tools 29 King Wholesale 88 MCM Electronics 89 MD Electronics 90 Mark V. Electronics, 91 McGraw Hill Book Club 14 Microprocessors I. In ltd. 85 Mouser 81 NRI Schools 24 Optoelectronics 13 Parts Express 92 184 189 78 190 185 188 191 177 178 179 People's College of Indep. Study . 19 Peripheral Technology 85 Radio Shack 30 SCO Electronics 72 Star Circuits 20 TAB Books 23 TECI 73 Unicorn 93 U.S. Cable 72 Viejo Publications 83 WPT Publications 73 Xandi Electronics 29 ADVERTISING SALES OFFICE Gernsback Publications, Inc. 500 B Eti -County Blvd. F:irmingd:ile. NY 11735 1 (516} 293-3000 President: Larry Sleekier Vice President: Cathy Steckler For Advertising ONLY 516-293-3000 Fax 1 516 293-3115 Larry Steckler publisher Arline Fishman advertising director Denise Haven advertising assistant Christina Estrada advertising associate Kelly McQ/uade credit manager Subscriber Customer Service 1 - BOO- 2 B 8-0 652 Order Entry for New Subscribers 1-800-999-7139 7:00 AM- 6:00 PMM-FMST SALES OFFICES EAST/SOUTHEAST Stanley Levitan, Eastern Sales Manager Radio-Electronics 259-23 5 7th Avenue Utile Neck, NY 1 1362 1-718-428-6037. 1-516-293-3000 Fax 1-718-225-8594 M I D WEST/Texa s/ A rka n sa s/Okta . Ralph Bergen, Midwest Sales Manager Radio- Electronics 540 Frontage Road— Suite 339 Northfield. IL 60093 1-708-446-1444 Fax 1-708-446-8451 PACIFIC COAST/ Mountain States Marvin Green, Pacific Sales Manager Radio-Etectronics 5430 Van Nuys Blvd. Suite 31B Van Nuys.CA 91401 1-818-986-2001 Fan 1-818-986-2009 Never before has so much professional information on the art of detecting and eliminating electronic snooping devices — and how to defend against experienced information thieves — been placed in one VHS video. If you are a Fortune 500 CEO, an executive in any hi-tech industry, or a novice seeking entry into an honorable, rewarding field of work in countersurveillance, you must view this video presentation again and again. Wake up! You may be rhe victim of stolen words — precious ideas that would have made you very wealthy! Yes, profes- sionals, even rank amateurs, may be lis- tening to your most private con- versations. Wake up! If you are not the victim, then you are surrounded by countless vic- tims who need your help if you know how to discover telephone taps, locate bugs, or "sweep" a room clean. There is a thriving professional service steeped in high-tech techniques that you can become a part of! But first, you must know and understand Couotersurveilance Technology. Your very first insight into this highly tewarding field is made possi- ble by a video VHS presentation that you cannot view on broadcast television, sat- ellite, or cable. It ptesents an informative program prepared by professionals in the field who know rheir industry, its tech- niques, kinks and loopholes. Men who can tell you more in 45 minutes in a straightforward, exclusive talk than was ever attempted before. Foiling Information Thieves Discover the targets professional snoopers seek out! The prey are stock brokers, arbitrage firms, manufacturets, high-tech companies, any competitive industry, or even small businnesses in rhe same community. The valuable informa- tion they filch may be marketing strat- egies, customer lists, product formulas, manufacturing techniques, even advet- tising plans. Information thieves eaves- drop on coutt decisions, bidding information, financial data. The list is unlimited in the mind of man — es- pecially if he is a thief! You know that the Russians sectetly insralled counrless microphones in the concrete work of the American Embassy building in Moscow. They converted R HAKIM USKHIH6 W*m HAVE YOUR VISA or MC CARD AVAILABLE what was to be an embassy and private residence into the mosr sophisticated re- cording studio the world had evet known. The building had to be torn down in ordet to remove all rhe bugs. Stolen Information The open taps from where the informa- tion pours out may be from FAXs, com- puter communications, telephone calls, and everyday business meetings and lunchtime encounters. Businessmen need counselling on how ro eliminate this in- formation drain, Basic telephone use cou- pled with the usets understanding that someone may be listening or recording vital data and information grearly reduces the opportunity for others to purloin meaningful information. RADIO-ELECTRONICS VIDEO DEFER RE 50O-B Bi-County Blvd. t-jrminndak. NY 11715 Please rush my copy of the GowaxxsorttffitDCt Tct-hniuues Video VHS Cassette (br 149.93 plus S'l . 1)0 for postajte and handling. No. of Cassettes ordered Amount flf payment 5 Bill my D VISA □ MasterCard Card No. Expire Date / Sit^nattite . N.niy. Address City . State . ZIP . All payment in U.S.A. I'onds. Canadians add Si.OU |*'r VHS cassette. No foreign orders. New York State residents atld applicable sales rax. The professional discussions seen on the TV screen in your home reveals how to detect and disable wiretaps, midget radio-frequency transmitters, and other bugs, plus when to use disinformarion to confuse the unwanted listener, and the technique of voice scrambling telephone communications. In fact, do you know how to look for a bug, where ro look for a bug, and what to do when you find it? Bugs of a very small si^e are easy to build and they can be placed quickly in a matter of seconds, in any object or room. Today you may have used a telephone handset that was bugged. It probably contained three bugs. One was a phony bug to fool you into believing you found a bug and secured the telephone. The sec- ond bug placates the investigator when he finds the real rhing! And rhe third bug is found only by the professional, who continued to search just in case there wete more bugs. The professional is not without his tools. Special equipment has been de- signed so that the professional can sweep a room so that he can detect voice-acti- vated (VOX) and remote-activated bugs. Some of this equipment can be operated by novices, others require a trained coun- rersurveillance professional . The professionals viewed on your tele- vision screen reveal information on the latest technological advances like laser- beam snoopers rhat are installed hun- dreds of feer away from the room they snoop on. The professionals disclose that computers yield information too easily. This advertisement was not wtitten by a countersurveillance professional, bur by a beginner whose only experience came from viewing rhe video tape in the pri- vacy of his home. Afrer you review the video carefully and understand its con- tents, you have taken the first important step in eithet acquiring professional help wirh your surveillance problems, or you may very well consider a career as a coun- tersurveillance professional. The Dollars You Save To obtain the information contained in the video VHS cassette, you would attend a professional seminar costing $350-750 and possibly pay hundreds of dollats more if you had to travel to a distant city to attend. Now, for only $49.95 (plus 54.00 P&H) you can view Countersur- veillance Techniques at home and take refresher views often. To obtain your copy, complete the coupon below or call toll free. There| nothing newabout having eveiything j- you need inoneplace. WithCompuServe, it's all atyour fingertips. When you become a member of CompuServe, you join a vital, active community of over 500,000 friends and neighbors from all over the world, Small-town friendly. We keep in touch with electronic mail and faxes, and by posting messages on our bulletin boards, We even meet in forums to discuss everything from science fiction to sharing software, and to get invaluable personal computer software and hardware support. And that's one of the best things about small towns: people helping people. Big-city opportunities. But we can also shop coast-to-coast at hundreds of nationally known stores, and take advantage of a world-class library We have access to the latest national and interna- tional news. And our special financial files . offer complete statistics on over 10,000 NYSE, AMEX, and OTC securities. We can even trade online with our local discount brokers. And, just for fun . . . We've also got games — everything from trivia to TV-style game shows with CIRCLE 180 ON FREE INFORMATION CARD live entertainment to interactive space and fantasy adventures. We've got airline schedules, so you can check out the bargains and book your own flights online, We even have listings from over 35,000 hotels. It's not hard to get here. To get to CompuServe, all you need is a computer and a modem. We' ll send you everything else, includ- ing a $25.00 Usage Credit. In most places you ' ll be able to go online with a local phone call. To buy a CompuServe Mem- bership Kit, see your nearest computer dealer. To receive our informative brochure or to order direct, call 800 848-8199. CompuServe