Audio & Video to Make Digital Add a Hard-Disk
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YOUR ONE -STOP SOURCE OF ELECTRONICS INFORMATION ICD 08559 MARCH 1987 $1.95 CANADA $2.50 THE MAGAZINE FOR ELECTRONICS & COMPUTER ENTHUSIASTS A DISTRIBUTION AMP PROJECT FOR CLEAN AUDIO & VIDEO 40 USING AN OSCILLOSCOPE TO MAKE DIGITAL LOGIC MEASUREMENTS nw TO ADD A HARD-DISK Keychain Electronic Project ; p. 68) C'? TO O !R CARD " ONAL COMPUTER he EPROM Programw 4K and 128K EPRC te Telephone Bell itlStand-Alone Annurt ia (Ia. 48i Adding A Hard -Disk Drive to a Personal Computer(p.26) Solid -State Phone Bell Replacement /Annunciator Bulk Rate Also: Forrest Mims' Keychain Electronic Projects Using SMTs Eric Grevstad's Permit No. 79 First Impressions of the Tandy 3000HL and Words & Figures Don Lancaster U.S. Postage Paid on Genlocking Videc Images, WF Converters, & an Easy Printed -Circuit Process, Gordonsville. 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TTA -469 www.americanradiohistory.com Which Way To YOUR Future? Are you at a crossroads in your career? Have you really thought about it? Are you planning for your future, or perhaps refusing to face the subject? Which way will you go - down the same old road? Or are you ready for something else? In electronics you can't stand still. If you are not moving ahead, then you're falling behind. At the crossroads of your career, various choices are available -- and, yes, decisions have to be made. Which road will you take - one that doesn't go where you want to be, or one that leads to hard work but also to the Put Professional better life? Ah, decisions, decisions! KNOWLEDGE Career decisions are so important that you need all the input you can get before locking-in on one of them. Grantham Col- and a lege of Engineering offers you one source of input which may COLLEGE DEGREE that decision. It's our free catalog. help you in making in your Ask for our free catalog and you may be surprised to learn how Electronics Career it is easily possible to earn a B.S. degree in electronics without attending traditional classes. Since you are already in electronics through (you are, aren't you ?), you can complete your B.S. degree work HOME STUDY with Grantham while studying at home or at any convenient place. Grantham offers this program, complete but with - But don't expect to earn that degree without hard out laboratory, to electronics technicians whose work. Any degree that's worth your effort can't be objectives are to upgrade their level of technical had without giving effort to the task. And of course employment. it is what you learn in the process, as much as the degree itself, that makes you stand out above the Recognition and Quality Assurance places you in an enviable position, crowd that Grantham College of Engineering is accredited by -wise and financially. prestige the Accrediting Commission of the National Home Study Council, as a degree -granting institution. Grantham College of Engineering 10570 Humbolt Street All lessons and other study materials, as well as com- munications between the college and students, are in the Los Alamitos, California, 90720 English language. However, we have students in many foreign countries; about 80% of our students live in the United States of America. r -1 for Grantham College of Engineering M-3-87 FREE 10570 Humbolt Street, Los Alamitos, CA 90720 Booklet Please mail me your free catalog which explains your CLIP This free booklet B.S. Degree independent -study program. explains the COUPON Grantham B.S. and mail in Name Age Degree Program, envelope or offered by inde- paste on Address pendent study to postal those who work Zip card. City State in electronics. www.americanradiohistory.com EDITORIAL STAFF RN Art Salsberg Editor -in -Chief EL ICS Alexander W. Burawa THE MAGAZINE FOR ELECTRONICS & COMPUTER ENTHUSIASTS Managing Editor Dorothy Kehrwieder MARCH 1987 VOLUME 4, NUMBER 3 Production Manager Elizabeth Ryan Art Director FEATURES Barbara Scully Artist 16 Logic Signal Measurements Pat Le Blanc Using an oscilloscope to make basic measurements in Florence Martin digital logic circuits. By Robert Ramirez Phototypographers Hal Keith 26 Adding a Hard -Disk Drive Illustrator Installing standard hard drives and hard -disk cards: Bruce Morgan Seagate's ST225 internal hard disk. By TJByers Photographer Western Digital's "FileCard." By Joe Desposito Maynard Electronics' "OnBoard." By Art Salsberg Joseph Desposito, Leonard Feldman, 26 Eric Grevstad, Glenn Hauser, Don Lancaster, Forrest Mims III, 34 An Audio /Video Distribution Amplifier Stan Prentiss Eliminates signal -loss problems when integrating a Contributing Editors variety of audio and video components into a home - entertainment system. By Jack Cunkelman BUSINESS STAFF Richard A. Ross 44 Stand -Alone EPROM Programmer Publisher (Conclusion) Art Salsberg Plug -in module allows basic Programmer to handle Associate Publisher 64K and 128K EPROMs. By Walter W. Schopp Dorothy Kehrwieder General Manager 48 The Ringer Frank V. Fuzia 34 Solid -state telephone bell replacement and stand- Controller alone incoming-call annunciator. By C.R. Ball Arlene Caggiano Accounting Cheryl Chomicki COLUMNS Subscriber Services 58 Hardware Hacker o SALES OFFICES O Author answers readers' questions. Modern Electronics By Don Lancaster o 76 North Broadway Hicksville, NY 11801 64 Software Focus (516) 681-2922 MacPublisher II for Plenty of Desktop Publishing Eastern Advertising Representative Power. By Mike Nikolich Herb Pressman 44 76 North Broadway 68 Electronics Notebook Hicksville, NY 11801 Keychain Electronic Projects. By Forrest M. Mims III (516) 681-2922 LE Midwest & West Advertising Representative /y Z 78 PC Papers Market /Media Associates 339 i Two Hybrids: Tandy 3000HL, Words & Figures. 1150 Wilmette Ave. By Eric Grevstad Wilmette, IL 60091 (312) 251 -2541 L Ted Rickard 1 /4 1 DEPARTMENTS Kevin Sullivan 339 Offices: 76 North Broadway, Hicksville, NY 11801. Tele- phone: (516) 681 -2922. Modern Electronics (ISSN 0748- 4 Editorial 9889) is published monthly by Modern Electronics, Inc. Consumer Rights & Wrongs. By Art Salsberg Application to mail at second class rates pending at Hicksville, NY and other points. Subscription prices (payable in US Dollars only): Domestic -one year + 1/4 14 5 Letters $17.97, two years 533.00, three years $48.00; Canada/ 339 Mexico -one year $20.00, two years $37.00, three years i á - i $54.00; Foreign -one year $22.00, two years $41.00, three years $60.00. Foreign Air Mail -one year $75.00, 6 Modern Electronics News two years $147.00, three years $219.00. L Entire contents copyright 1987 by Modern Electronics, 11 12 New Products Inc. Modern Electronics or Modern Electronics, Inc. as- 1 /9 13 sumes no responsibility for unsolicited manuscripts. Al- low six weeks 319 for delivery of first issue and for change of i 10 76 Books & Literature address. Printed in the United States of America. Postmaster: Please send change of address notice to Modern Electronics, Inc., 76 North Broadway, Hicks- 68 92 Advertisers Index ville, NY 11801.