Popular Electronics-Electronic Experimenters Handbook 1983

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Popular Electronics - Electronic Experimenters Handbook 1983
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   he orkbench  POPUL R ELECTRONICS _ ELECTRONIC · . . . . . . . EXPERIMENTER S D=O ~[Q)[ID@@[Z®1983 TOOLS & EQUIPMENT FOR ELECTRONIC WORKBENCHES _ _ _ . .. _ _ _ .... ....   ..   ....   .   John McVeigh 3 HIGH-PERFORMANCE SCRATCH & RUMBLE FIL TEAS .   .   . .. .   .. .. ... .   John H Roberts 15 ' CHECK YOUR HEAT LOSS WITH A DEGREE-DAY METER ..   .. .. ........ ..   ......... ..   .. Rush W Hood 21 EXTRA KEYBOARDS FOR MICROCOMPUTERS .. .... ...... .. .. ....... .... .. .... .. . .... .   ...   ..   .. Adolph A. Mangieri 26 A LOW-COST 16-LED LOGIC MONITOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tom Kronef lwetter 29 BUILD A VOCAL TRUTH ANALYZER ........   ..   .   .   .   .. . Colleen McNeice & Roger Cota 32 EXPERIMENTING WITH A SOUND-EFFECTS GENERATOR .   .   .. .. ... .. ....   .   .   .   Frank I Gilpin 39 ACCURATE WAYS TO MEASURE IN-CIRCUIT RESISTANCES .... .. .   .   . ..   ..   .. . Frank Witmer & Diane Jasinksi 44 BUILD AN INFRA-RED ROAD ICING ALERT ...   .. .. .... .. . .. .... ...... ..   ... ......   ... ..   ....   Thomas R Fox 47 ACTIVE FILTER IMPROVES MORSE CODE READABILITY .. .. .. .. ....   .. . .. .... .. . .. ....   .. ..   .... .. .   Lou Dezettel 51 BUILD A MOTION-DETECTOR ALARM ...   .....   ....   .. ...   .. .. ....... .. ..   .... Walter Gontowski 56 ADD A KEY-DOWN AUDIBLE SIGNAL TO YOUR COMPUTER .   .. .. ..   .   ..   Roy Auer, Jr. 65 AN EXPERIMENTER'S GUIDE TO RELAY CONTROL . .. .. .. . .. .. .. ..   .. .. .. ...   ..   AI Sydnor 67 WAH-WAH FOOT PEDAL .   .   .   ... .. ...   . .. ..   .. .. ..   Fred Puccetti 72 DIGITALLY PROGRAMMED VARMINT ZAPPER .. .... .   .. .. .   .   ....   ...   ...   .... ..   ... Fritz Mueller 76 A LOW-COST A/D CONVERTER .   ..   .. ..   . .. ..   .... ..... .. .. .. ... .... .   ....   Sami A. Shakir 79 BUILD A METAL LOCATOR .. ...   . .. ...   . .. .... .. ...   .. .. .......   . .. .. .. .. .....   ..... Robert Krieger 82 BUILD A PERSONAL RADIATION MONITOR ..   , ..   ..... .. ........... .. .   J. Steidley, M Nakashian G. Entine 87 BUILD A PHOTO DARKROOM Slr-IK SENTINEL .   .   .   .   ......   Frank I Gilpin 92 HOW TO ADD TRIGGERED SWEEP TO AN OSCILLOSCOPE ...   ..   . David A. Israel 98 A 3-WAY DRIVE SYSTEM FOR SPEAKERS .   .   .   .   .. .....   . J.F.P. Marchand 102 SPECIAL COUNTER CIRCUITS FOR EXPERIMENTERS ..... .. ....   .. .....   ...   ..   ..   . .. Patrick J. Delaney 107 MEASURING LARGE CURRENTS WITH A DMM .   ..   .......   .   .   ..   ...... .. . .. Robert H. Johns 111 TROUBLESHOOTING PHASE-LOCKED-LOOP CIRCUITS ..........   . .. ..... .. ..   ....   .   ....   .. .. Harold Kinley 114 BUILD AN AUTOMOBILE WINDSHIELD WIPER CONTROLLER ... .. . .... ......   ..   .   ...   .   William Kraengel 118 INEXPENSIVE AUTO BATTERY TESTER ....   .   ..   .... ..   .   .   .... .. ..   . Hank Olson 121 HOW FAR DID YOU CYCLE TODAY? .. ..   .   .   .   .   .. ...   .   Arthur V. Clark 123 ELECTRONIC EXPERIMENTER'S HANDB OOK is published annually by Ziff-Davis Publishing Co mp any at One Park Avenue New Yo rk, New York 10 01 6. Richard P. Friese, Pr es ide nt ; Furman He bb , Executive Vice-Preside nt ; Selwyn Tau bm an, treasurer; Bertram A Abr ams, Secretary 1983 EDITION OPYR   HT   1 98 2 BY ZIFF- DA VI S PUB LI SHING CO MPANY. ALL RIGH TS RESERVED. PERMISSION S: Material in this publi ca tion may not be reproduced in any form without permission. Requ es ts for permission should be dir ec ted to John Ba bcock, Rights & Permissi on s, Z if f-Davis Publishing Company, One Park Av enu e New York, NY 1 00 16. The publisher has no knowledge of any propri eta ry rig ht s which will be violated by th e making or using of a ny items di sc losed in this Ha ndb ook. ARTHUR P. SALSB ERG, E di t or ial Dir ec tor ã AL E XAND ER W. BURAWA , Man ag ing Editor EDWARD I. BUXBAUM, rt D ir ec tor ã ANDRE DUZANT, Technical Illustrator JOSEPH E. MESICS, Publish er ã RtCHARD GOVATSKI , Adv ert ising Dir ec tor  4 11 101 ·  PPLI® FBIAIS Here's the book you've been looking for a&;R k>...,. TilE GP6Mive APPLE 1--   _ ~ , -.......- .\ ....... THE CRE TIVE · PPLE The Creative pple brings you 450 pages of the best articles and features on the Apple to appear in the past four years of. Creative Computing Re · vised and updated, this wealth of material gives you dozens of ways to tap the treq1endous poten tial of your App l e, improve your programming skills, and expand your computing knowledge. Graphic utilities, a ni mation, digitized images, music ed iting, educational software and app li cations, telecomputing, home control systems, Visi Calc and many ot her timely topics are thoroughly examined and discussed. Ready-to- run programs give you imm ediate use of this inf ormative and st imulat in g collection, w hil e a chapter on tips a nd tricks for easier programming lets you unlock the versatility of the Apple computer-and your own resourcefulness. Whether for busines s, personal budgeti ng, the thrill of computer games or the development of ed ucational applicati ons, you'll find plenty here to help you get the most out of your Apple. The Creative pple ; edited by Mark Pelczarsk:i and Joe Tate. 8Yz x ll , so ftcover, 450 pages, illustrated. 15.95. Apple is a registered trademark of Apple Computer, Inc. rG~ati V(;(';OrltJHl ti '-J.. Dept. N-;;; l 39 East Hanover Ave nue, Morris Plains, NJ 07950 Please send me copies of Creat ive ppl e at $15.95 eachã plu s $2 pcstage a nd handling. # 18R All fore ign o rd ers (exce pt Canada and M ex i co ) add $3 to regular postage and hand lin g charge. S hipped airmail only. · ãNJ residents add 5% sales tax B AYMENT ENCLOSED$ _ _ CHARGE MY: 0 American Express 0 Ma sterCard 0 Vi sa Card No. _   _ ___LXp. Date Signature _   _ _ Mr./Mr s./M s. -   p;;;:lea se CO :C n :;-   - u n n:: ;;: :;e   Addr ess Ap t. _ City _   State tp _ _ for faster service, PHONE TOLL FREE: 800-63 -8112 ( In NJ call201-540-0 445) institutions only- ' L _ == e~n~ ~o_::c~e~ _ 2 THE COVER Personal computing has become one of the most popular of electronic hobbyist/experimenter pursuits. Among the various items required to make a personal computer into a practi cal reality for the hobbyist is the Heath No. H-88-5 cassette input/output (110) interface assembly shown on the cover. Designed to plug directly into the Heath Model H-89 all-in-one microcomputer (supplied in kit form) , this assembly provides an inexpensive means for loading prepackaged programs (soft ware) into the computer from, and sav ing locally generated programs on, tape using an ordinary low-cost audio cas sette recorder/player. Heath and most other manufacturers offer special cir cuit board assemblies designed to plug into their computer buses and provide a means for experimenting with user-de  signed or published circuits, such as vocalizers, fire and security alarms, en vironment (cooling and heating) and lighting control, etc. COVER PHOTO: Barbara & Justin Kerr ZIFF-DAVIS PUBLISHING COMPANY President RICHARD P. FRIESE President, Consumer Magazine Division ALBERT S. TRAINA Executive Vice President FURMAN HEBB Senior Vice Presidents PHILLIP T. HEFFERNAN SIDNEY HOLTZ . EDWARD D. MUHLFELD PHILIP .SINE Vice Presidents ROBERT BAVIER PAUL H. CHOOK BAIRD DAVIS GEORGE MORRISSEY Vice President , Annuals JERRY SCHNEIDER Treasurer SELWYN TAUBMAN Secretary BERTRAM A. ABRAMS Editorial and Executive Offices One Park Avenue New York, NY 10016 212-725-3500 Publisher Joseph E. Mesics 212-725-3568 New York Office Advertising Manager : Richard Govatski (725-7 460) Eastern Advertising Representatives : Tom Ballou (725-3578) Ken Lipka (725-3580) Midwestern Office Suite 1400, 180 N. Mi chigan Avenue Chicago, IL 60601 (312-346-2600) Sales: Bob Vanek Western Office 3460 Wilshire Boulevard Los Angel es, CA 90010 (213-387 21 00) Sales: Ted Welch · Representation in Japan J.S. Yagi , lwai Trading Co mpany, Ltd. 603 Ginza Sky He ights Building 18-13, Ginza 7-Chome Tokyo, Japan 104 Telephon e: (03)588-0165, 545-3908 ;: 0: :. ã ã Me mbe r Audit Burea u f C1rc ulatio. 1S 1983 ELECTRONIC EXPERIMENTER'S HANDBOOK is published annually by the Ziff-Davis Publishing Co mp a ny . One Park Avenue. New York. NY 10016. Also pub lishers of Computers & El ec troni cs (fqrmerly Popular El ec troni cs ). Invitation To Electronics, Stereo Revie w, Tape Recording & Buying Guide, Stereo Buyers G~   e   ELECTRONIC EXPERIMENTER'S HANDBOOK
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