Low-Cost So Id the Schematic for Ele Apture and Pawing Rogram That's Telco in a Box Right for You! Test Your Telephone Devices with This Phone-Line Simulator
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SEPTEMBER 1995 EleconicsCombined with Electronics® e help you Low-Cost So Id the schematic For Ele apture and pawing rogram that's Telco In A Box right for you! Test your telephone devices with this phone-line simulator Build Your Own SIMM Memory Modules Recycle your old memory and save a bundle! Over/Under Voltage Monitor Protect your sensitive electronic equipment from sags and surges $3.50 U.S. 0 9 > Carbon-Monoxide Detector $3.95 CAN. This easy-to-build unit 091 28 48783 could save your life! www.americanradiohistory.com A cr as courser in why you can always count on -- -- Fluke meters. := Professionals know Fluke never lets you down. Every day, you're asked to rise to new challenges. You need a test tool as tough as your job. True story: a tech working atop a 170 -foot tower accidentally knocks his Fluke 23 meter and an industrial -grade screwdriver over the edge. Straight down they fall, crashing to the asphalt below. He goes down. His screwdriver's handle is shattered. Expecting the worst, he gingerly picks up his Fluke meter and smiles. All that's broken is a fuse. He snaps in another, goes right back up and continues testing with the same Fluke 23. No harm to the meter - or the pocketbook. Unbelievable? Not when you consider every rotary knob, keypad, and switch on every Fluke meter must pass strict testing for drops, intense heat or cold, electrical overloads, and years of harsh wear and tear. What's more, Fluke meters are built in an ISO 9001 certified factory. So you know you can always meet your quality goals. People depend on you, so depend on Fluke. See your Fluke distributor today, or call 1- 800 -59 -FLUKE for a catalog and a direct connection to a distributor near you and ask for a catalog. Serious Tools for Serious Work For technical or application support call 1.800.44- FLUKE. ©1994 Fluke Corporation. FO. Box 9090, M/S 250E. Everett. WA, USA 98206 -9090. Canada (905) 890 -7600. Send us your "Fluke survival story" Europe (31 40) 644200. Other Countries (206) 356 -5500. and get a free meter case. All rights reserved. Ad No. 00681 FLUKE www.americanradiohistory.com Take this GIANT CIRCUIT LIBRARY for only $14.95 when you join the Electronics Engineers' Book Club® THE ENCYCLOPEDIA OF ELECTRONIC CIRCUITS -VoIs. 1 -4 by Rudolf F. Graf Hundreds of circuit ideas alphabetically arranged - from Alarm circuits to Zero crossing detector circuits! "... includes schematics for the latest electronics circuits from industry leaders.. -Popular Electronics Turn to this com- prehensive circuit library for hundreds of project ideas ... valuable troubleshooting and repair tips ... and con- cise pinout diagrams and schematics. In each volume you'll find more than 700 electronic and integrated circuits and A 100+ circuit categories right at your fingertips $240.00 to give you ideas you Value! can use on the job or at your workbench. 3,088 total pages 4,490 total illustrations Book No. 5861488 Hardcover As a member of the ELECTRONICS ENGINEERS' Electronics Engineers' BOOK CLUB - Book Club .. A Division of McGraw -Hill, Inc., P.O. Box 549, Blacklick, OH 43004 -9918 ... you'll enjoy receiving Club bulletins every 3 -4 weeks containing exciting offers on the latest books YES! Please send me The Encyclopedia of Electronic Circuits - in the field at savings of up to 50% off of regular Vols. 1 -4 (5861488), billing me $14.95 plus shipping /handling & tax. Book Club publishers' prices. If you want the Main Selection, Enroll me as a member of the Electronics Engineers' in this ad. If not satisfied, I may return do nothing and it will be shipped automatically. If according to the terms outlined within 10 days and have my membership cancelled. you want another book, or no book at all, simply the books form to us by the date specified. return the reply Name You'll have at least 10 days to decide. If you ever receive a book you don't want due to late delivery Address of the bulletin, you can return it at our expense. And City you'll be eligible for FREE BOOKS through the Bonus Book Plan. Your only obligation is to purchase 3 State more books during the next 2 years, after which you Zip Phone may cancel your membership at any time. Valid for new members only, subject to acceptance by EEBC. Canada must remit in U.S. funds drawn on U.S. banks. Applicants outside the U.S. and Canada will receive special ordering instructions. A Publisher's price shown. ©1995 EEBC shipping /handling charge & sales tax will be added to all orders. RPIF995 1 www.americanradiohistory.com Electronics NOW Vol. 66 No. 9 fi f i\J f S E P T E M B E R 1 9 7 5 33 LOW -COST SOFTWARE FOR ELECTRONICS 37 CARBON MONOXIDE DETECTOR Circuit design software has been around for about 20 An early years. Depending on how elaborate the software is, you warning of the can draw a schematic, breadboard the circuit, and de- presence of sign a foil pattern for a PC board, all without ever lifting a carbon pencil. These soft- monoxide can CIRCUIT COOKBOOK: MODERN BRIDGE CIRCUITS ware packages have save your life. traditionally been - Robert Gaffigan Jr. high -priced industri- Electronicit al applications that Elecmaaares NOW were too expensive We help yea 39 OVER/UNDER VOLTAGE LOW-COST Soft pick the for most hobbyists sckenaac PROTECTOR For capture and and small business- Ele drawl Prevent costly program Burs Telco In A Box es. However, the last right for peel damage to lest yam lekpaaae 1eYER couple years have wins Oft plume Wu mime appliances that seen an influx of low - Build Your Own SIMM are always Memory Modules cost circuit -design Recycle yam aid Mummy turned on. and save a auldlei. software that's ideal- Ron Tipton Over - Under ly suited for home Voltage Monitor Protect your sensitive Maim: use and small pro- equipment Iron; sags and surges duction work. Now TELCO IN A BOX Iles easy In Mold anll II 43 the main problem is could save your me! Simulate a finding the program tlephone line that's right for you. To take the risk and mystery out of with the shopping for this software, Electronics Now has scoured Telephone the market in search of circuit -design packages $350 and Company in a less. Turn to page 33 to find out which software package Box. best suits your needs. - James E. Cicon -TJ Byers rn As a service to readers, ELECTRONICS NOW 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 materials and workmanship used by readers, ELECTRONICS NOW disclaims any . responsibility for the safe and proper functioning of reader -built projects based upon or from plans or information published in this magazine. Since some of the equipment and circuitry in ELECTRONICS NOW may relate to or be covered by U.S. patents, ELECTRONICS NOW 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. ZO ELECTRONICS NOW, (ISSN 1067-9294) September 1995. Published monthly by Gernsback Publications, Inc., 500 -B Bi- County Boulevard, Farmingdale, NY 8 11735. Second -Class Postage paid at Farmingdale, NY and additional mailing offices. Canada Post IPM Agreement No. 334103, authorized at Mississauga, Canada. One -year subscription rate U.S.A. and possessions $19.97, Canada $27.79 (includes G.S.T. Canadian Goods and Services Tax, Registration No. R125166280), all other countries $28.97. 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 $3.50. ©1995 by Gernsback Publications, Inc. All rights reserved. Printed in U.S.A. POSTMASTER: Please send address changes to ELECTRONICS NOW, Subscription Dept., Box 55115, Boulder, CO 80321 -5115. A stamped self -address 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 loss or damage of manuscripts and /or artwork or photographs while in our possession or otherwise. www.americanradiohistory.com S E P T E M B E R 1 J 9 5 RECYCLING MEMORY Electroida Save bucks by recycling DIP MICIVIVR memories into SIMMs. Hugo Gernsback (1884 -1967) founder - Leon W. Schmidt LARRY STECKLER, EHF, CET, MODERN BRIDGE CIRCUITS Editor -in -chief and publisher holds an honored The bridge circuit EDITORIAL DEPARTMENT place in the history of electronic BRIAN C. FENTON, editor instrumentation. MARC SPIWAK, associate editor NEIL SCLATER, associate editor Ray Marston - TERI SCADUTO, assistant editor JEFFREY K. HOLTZMAN computer editor ROBERT GROSSBLATT, circuits editor LARRY KLEIN, audio editor E,PA':,. DAVID LACHENBRUCH contributing editor DON LANCASTER rt VIDEO NEWS contributing editor EVELYN ROSE, editorial assistant What's new in this fast -changing field. - David Lachenbruch ART DEPARTMENT ANDRE DUZANT, art director RUSSELL C. TRUELSON, illustrator EQUIPMENT REPORTS PRODUCTION DEPARTMENT RUBY M. YEE, production director Sescom CT-6 Cable Tester Kit. KAREN S. BROWN advertising production KATHRYN R. CAMPBELL production assistant HARDWARE HACKER KEN COREN An all- channels FM transmitter, desk top production and more. - Don Lancaster CIRCULATION DEPARTMENT JACQUELINE P. CHEESEBORO circulation director COMPUTER CONNECTIONS THERESA LOMBARDO circulation assistant How to solve your PC problems. - Jeff Holtzman REPRINT DEPARTMENT MICHELE TORRILLO reprint bookstore AUDIO UPDATE Typography by Mates Graphics 134 by David Loewy An audio connector overview.