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Contents Vol.17, No.4; April 2004 www.siliconchip.com.au FEATURES 7 Review: Adilam RFID Evaluation Kit Radio frequency identification is fast becoming the standard for many tracking and identification tasks. Here’s a low-cost way to get started – by Peter Smith 8 Looking Into LEDs Their history, recent developments and what’s available – by Ross Tester 12 Hands-On PC Board Design For Beginners; Pt.3 Here’s how to print Autotrax PC board designs from within Windows. There’s also a step-by-step procedure for etching your own boards – by Peter Smith 56 Worldspace Radio Via Satellite In Australia All you need is a satellite dish and a special receiver to open up a whole new world of “radio” broadcasts – by Garry Cratt 81 Review: Redback 8-Channel Pro Mixer Looking for a good-quality 8-channel mixer? Take a look at the Redback A4425 from Altronics – by Ross Tester Step-By-Step Guide To Making Your Own PC Boards – Page 12. PROJECTS TO BUILD 22 Loudspeaker Level Meter For Home Theatre Systems Having trouble adjusting the channel levels in your home theatre system? This simple project makes the job easy – by John Clarke 32 Shut That Mutt Got a problem with barking dogs? Shut ’em up with this high-powered screamer. It gives an ultrasonic blast that only they can hear – by Branko Justic 60 A Smart Mixture Display For Your Car A 10-LED display indicates the fuel mixture, while a small buzzer sounds if the mixtures go dangerously lean – by Julian Edgar & John Clarke 68 The ESR Meter Mk.2; Pt.2 Loudspeaker Level Meter For Home Theatre Systems – Page 22. Building, calibrating and using this handy test instrument. There’s also a comprehensive section on troubleshooting – by Bob Parker 75 PC/PICAXE Interface For UHF Remote Control Simple circuit lets you control the Oatley Electronics 4-Channel UHF Transmitter using a PC or PICAXE – by John Holliday SPECIAL COLUMNS 28 Circuit Notebook (1) Curve Tracer Adaptor; (2) Logic Probe With Sound; (3) 7.2V Battery Replacement For Camcorders; (4) Stroboscope Uses White LEDs 40 Serviceman’s Log Shut That Mutt – Page 32. A mixed bag of tricky problems – by the TV Serviceman 82 Vintage Radio The art of cannibalism & making do – by Rodney Champness DEPARTMENTS 2 4 53 54 55 Publisher’s Letter Mailbag Order Form Product Showcase Silicon Chip Weblink www.siliconchip.com.au 90 91 93 95 Ask Silicon Chip Notes & Errata Market Centre Ad Index Smart Mixture Display For Cars – Page 60. April 2004  1