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Contents Vol.18, No.2; February 2005 www.siliconchip.com.au FEATURES    8  Border Surveillance In The 21st Century New technology is on the hunt for contraband, arms and illegal immigrants – by Barrie Smith   79  School Electronics: Putting The Picaxe To Work All the fun at the Picaxe fair and first prize to East Hills Girls Technology High School for an ingenious Picaxe-based pedestrian crossing – by Ross Tester   88  Satellite C-Band TV: Death By Overload, Pt.2 Some practical ideas to minimise (or even eliminate) interference to C-band satellite signals from wireless broadband signals – by Garry Cratt 100  Build Yourself A Windmill Generator, Pt.3 USB-Controlled Electrocardiograph – Page 14. Third article shows you how to build the platform and install the stator, drive shaft and front bearing fitting – by Glenn Littleford PROJECTS TO BUILD   14  Build A USB-Controlled Electrocardiograph It’s controlled by a USB port on your PC or laptop and displays a person’s electrocardiogram (ECG) on the monitor or LCD screen – by Jim Rowe   32  TwinTen Stereo Amplifier Build this gutsy little amplifier for your Discman, MP3 player or games machine – by Jim Rowe & Peter Smith TwinTen Stereo Amplifier – Page 32.   64  Inductance & Q-Factor Meter Compact unit measures inductors from 200nH - 10mH, checks Q-factor from 1-120 and displays the results on an LCD – by Leonid Lerner   72  A Real Yagi Antenna For UHF CB Are you good at scrounging? All it takes is some plastic conduit and a couple of wire coat hangers to build this really effective antenna – by Stan Swan Inductance & Q-Factor Meter – Page 64. SPECIAL COLUMNS  44 Circuit Notebook (1) Laser-Guided Parking Aid; (2) Novel White LED Torch; (3) Electronic Thermostat For Plug-In Heaters; (4) ESR & Low Resistance Test Meter  48 Serviceman’s Log Life at the end of the food chain – by the TV Serviceman  90 Salvage It! Build a $2 battery charger – by Julian Edgar   92  Vintage Radio Low-Cost Yagi Antenna For UHF CB – Page 72. Converting a 240VAC set to 32V DC operation – by Rodney Champness DEPARTMENTS    2  Publisher’s Letter   4 Mailbag  43 Order Form  61 Product Showcase siliconchip.com.au 105  Ask Silicon Chip 108 Notes & Errata 109 Market Centre 111 Ad Index February 2005  1