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Contents Vol.16, No.3; March 2003 www.siliconchip.com.au FEATURES 8 GM’s Hy-Wire Fuel-Cell Car World-first concept car from GM combines a hydrogen fuel-cell power plant with drive “by-wire” technology. And just look at the styling! 13 A Look At Emergency Beacons An emergency beacon could save your life. Here’s a rundown on the various types that are available and how they work – by Peter Holtham GM’s “Hy-Wire” Fuel-Cell Car – Page 8. 76 Review: Canon’s Image Stabilised Binoculars Whether you’re into bird watching or astronomy (or anything else), these image-stabilised binoculars will get rid of the shakes – by Leo Simpson PROJECTS TO BUILD LED Lighting For Cars – Page 22. 22 LED Lighting For Your Car Replace your car’s filament lamps with LEDs for improved safety. There are several designs to build, all using high-brightness LEDs – by Peter Smith 36 Peltier-Effect Tinnie Cooler It’s based on a Peltier-effect module fitted with a fan-cooled heatsink. You just install it in a 6-pack Esky and to keep your tinnies cool – by Ross Tester 56 The PortaPAL Public Address System; Pt.2 Here’s the good oil on putting it together and getting it to work. We even describe an easy way to build the box – by John Clarke & Leo Simpson 66 12V SLA Battery Float Charger It’s intended for the PortaPAL but it also makes a great general-purpose 12V SLA battery charger – by John Clarke & Leo Simpson 68 The Little Dynamite Subwoofer Build this compact subwoofer for very little money. It’s ideal for use in a car or home unit – by Julian Edgar 79 More Fun With The PICAXE: A Shop Door Minder Peltier-Effect Tinnie Cooler – Page 36 Part 2 of this series shows you how to build a “Shop Door Minder . . . With Attitude” – by Stan Swan 82 SuperCharger Addendum Did you build the SuperCharger described in Nov-Dec 2002. If so, you need this simple 2-transistor add-on board – by Peter Smith SPECIAL COLUMNS 32 Circuit Notebook (1) Automatic Headlight Switch; (2) Simple Universal PIC Programmer; (3) Bat Detector Picks Up Ultrasound; (4) Junkbox-Parts Oven Timer 12V SLA Battery Float Charger – Page 66. 40 Serviceman’s Log Bring your hammer-drill and muscles – by the TV Serviceman 84 Vintage Radio Antennas & earthing systems for crystal sets – by Rodney Champness DEPARTMENTS 2 4 53 55 Publisher’s Letter Mailbag Product Showcase Silicon Chip Weblink www.siliconchip.com.au 90 92 93 95 Ask Silicon Chip Notes & Errata Market Centre Advertising Index The Little Dynamite Subwoofer – Page 68. March 2003  1