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Contents Vol.17, No.1; January 2004 www.siliconchip.com.au FEATURES 7 Freeze Motion In The Movies Ever wondered how they get those freeze-motion effects in movies like “The Matrix”? Believe it or not, it’s not done with computer image manipulation– by Barrie Smith 44 The World’s Smallest Flying Microbot It weights just 8.9 grams and flies using a pair of contra-rotating propellers driven by an ultra-thin ultrasonic motor PROJECTS TO BUILD 12 Studio 350 Power Amplifier Module Want an audio power amplifier with real grunt? This rugged module is capable of delivering 200W RMS into an 8-ohm load and 350W into a 4-ohm load, at very low distortion – by Leo Simpson & Peter Smith 24 High-Efficiency Power Supply For 1W Star LEDs Studio 350 Power Amplifier Module – Page 12. Easy-to-build design lets you use a pair of 1.5V “D” cells and includes a brightness control to further extend the battery life – by Peter Smith 33 Antenna & RF Preamp For Weather Satellites All the details for a simple turnstile/reflector antenna plus an RF preamp that mounts up on the mast to really drag in those satellite images – by Jim Rowe 54 Lapel Microphone Adaptor For PA Systems Simple adaptor features a balanced output and lets you use electret lapel and headset microphones with PA systems – by John Clarke 72 PICAXE-18X 4-Channel Datalogger It features four input channels that can be sampled and stored (or logged) at user-defined intervals. An onboard EEPROM stores the data – by Clive Seager 80 2.4GHz Audio/Video Link It’s based on pre-built modules, operates at maximum legal power and uses a WiFi antenna for excellent range – by Ross Tester High-Efficiency Power Supply For Luxeon 1W Star LEDs – Page 24. SPECIAL COLUMNS 40 Serviceman’s Log Born in the UK, dead in OZ – by the TV Serviceman 62 Circuit Notebook (1) Low-Cost Burglar Alarm For Boats; (2) Remote Alarm For Smoke Detector Circuit; (3) Yes/No Indicator Has Zero Standby Current; (4) Battery Charger Regulator; (5) Video Tracer For Trouble-shooting 84 Vintage Radio The Armstrong C5 Dual-Wave Receiver – by Rodney Champness DEPARTMENTS 2 4 53 69 Publisher’s Letter Mailbag Order Form Product Showcase www.siliconchip.com.au 71 90 92 93 Silicon Chip Weblink Ask Silicon Chip Notes & Errata Market Centre/Ad Index Antenna & RF Preamp For Weather Satellites – Page 33. January 2004  1