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Contents Vol.9, No.11; November 1996 FEATURES 4 Striking A Blow Against Lightning Lightning is by far the single biggest cause of power interruptions. Now there’s new technology that can track lightning strikes with impressive accuracy, so its effects can be minimised – by Ross Tester 82 Adding An Extra Parallel Port To Your Computer Add an extra parallel port to your PC and forget switching printer cables. We show you how to upgrade the serial ports as well – by Greg Swain BUILD AN 8-CHANNEL STEREO MIXER – PAGE 20 PROJECTS TO BUILD 20 Build An 8-Channel Stereo Mixer; Pt.1 Easy-to-build unit has eight main inputs, LED bargraph level meters, effects send and comprehensive headphone monitoring facilities – by John Clarke 30 Low-Cost Fluorescent Light Inverter Low-current unit is suitable for solar power installations and can drive both fluorescent and neon tubes – by Branco Justic 42 How To Repair Domestic Light Dimmers Don’t toss that crook light dimmer. Repair it by fitting a more rugged Triac and it should be fixed for good – by Leo Simpson LOW-COST FLUORESCENT LIGHT INVERTER – PAGE 30 59 Build A Multimedia Sound System; Pt.2 We describe two speaker systems designed specifically to go with the amplifier card described last month – by Rick Walters 66 600W DC-DC Converter For Car Hifi Systems; Pt.2 Second article has all the constructional details. Build it and fit high-power amplifiers to your car – by John Clarke SPECIAL COLUMNS 38 Serviceman’s Log Of ships and shoes and sealing wax – by the TV Serviceman HOW TO REPAIR DOMESTIC LIGHT DIMMERS – PAGE 66 54 Radio Control AM vs FM: the real facts in the argument – by Bob Young 88 Vintage Radio A pair of Astor valve radios – by John Hill DEPARTMENTS 2 16 18 53 79 Publisher’s Letter Circuit Notebook Bookshelf Mailbag Product Showcase 87 92 95 94 96 Order Form Ask Silicon Chip Market Centre Notes & Errata Advertising Index ADDING AN EXTRA PARALLEL PORT TO YOUR PC – PAGE 82 November 1996  1