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Contents Vol.10, No.10; October 1997 FEATURES   4  Have Disc, Will Travel Slide-out carrier makes it easy to remove and transport hard disc drives from one computer to another – by Ross Tester 37  Reprogramming The Holden ECU A clever software package takes the guesswork out of program changes if engine modifications are made – by Julian Edgar PROJECTS TO BUILD 16  Build A 5-Digit Tachometer This versatile design can cope with virtually any engine or rotating machinery and features 1 rpm resolution and leading zero blanking – by John Clarke Slide-Out Carrier For Hard Disc Drives – Page 4 41  Add Central Locking To Your Car You build a simple receiver and install the actuators and wiring in the doors. The transmitter comes ready-made – by Leo Simpson 56  PC Controlled 6-Channel Voltmeter Simple project uses just one chip & plugs into your PC’s parallel port. The companion software generates the on-screen display – by Mark Roberts 60  The Flickering Flame For Stage Work Here’s a simple prop that you can make for stage work. It’s easy to build and from a distance, gives a convincing imitation of fire – by Ross Tester Build A 5-Digit Tachometer – Page 16 66  Building The 500W Audio Power Amplifier; Pt.3 Final article details the loudspeaker protector and the thermal switch for the fan – by Leo Simpson & Bob Flynn SPECIAL COLUMNS 28  Serviceman’s Log Smoke, fire & confusion – by the TV Serviceman 53  Computer Bits Customising the Windows 95 start menus – by Jason Cole Add Central Locking To Your Car – Page 41 74  Radio Control The philosophy of R/C transmitter programming; Pt.2 – by Bob Young 88  Vintage Radio Wave-traps: another look at this useful accessory – by John Hill DEPARTMENTS   2  Publisher’s Letter 33  Order Form 64  Circuit Notebook 80  Product Showcase 92  Ask Silicon Chip 93  Notes & Errata 94  Market Centre 96  Advertising Index PC Controlled 6-Channel Voltmeter – Page 80 October 1997  1