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Contents Vol.12, No.4; April 1999 FEATURES 4 Autopilots For Radio-Controlled Model Aircraft From Russia with love – by Bob Young 10 Getting Started With Linux; Pt.2 Installing Linux on your PC – by Bob Dyball 48 SPECIAL OFFER: Low-Cost Internet Access No time limits, no download limits, no fine print – and no hassles 71 Electric Lighting; Pt.13 High-Power Electric Fence Controller – Page 24. Automotive lighting using LEDs – by Julian Edgar PROJECTS TO BUILD 24 High-Power Electric Fence Controller Capacitor discharge design suits long fence runs – by John Clarke 38 The Bass Cube Subwoofer Uses a readily-available cabinet plus a 10-inch woofer for lots of low-down grunt – by Julian Edgar 54 Programmable Thermostat/Thermometer Use it for precise temperature control or for monitoring with preset alarms – by Keith Rippon Easy-To-Build Bass Cube Subwoofer – Page 38. 66 Build An Infrared Sentry Easy-to-build unit monitors doorways, pathways or passageways up to 25 metres wide – by Branco Justic & Ross Tester 80 A Rev Limiter For Cars Don’t blow your engine. This unit could save you heaps – by John Clarke SPECIAL COLUMNS 18 Serviceman’s Log The day my multimeter lied to me – by the TV Serviceman Programmable Thermostat/ Thermometer – Page 54. 76 Vintage Radio Wow! My first vintage radio – by Rodney Champness DEPARTMENTS 2 35 46 50 65 Publisher’s Letter Mailbag Circuit Notebook Product Showcase Order Form 89 93 94 96 Ask Silicon Chip Notes & Errata Market Centre Advertising Index Infrared Sentry For Monitoring Doorways – Page 66. April 1999  1