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Contents Vol.10, No.12; December 1997 FEATURES   4  A Heart Transplant For An Aging Computer Take one tired old 486 then add a new motherboard, a new graphics card and a go-fast 200MHz K6 processor – by Ross Tester 18  Understanding Electric Lighting; Pt.2 The development of the incandescent lamp and the search for the perfect filament material – by Julian Edgar 92  Index To Volume 10 All the articles, projects and columns for 1997 PROJECTS TO BUILD A Heart Transplant For An Aging Computer – Page 4 24  Build A Speed Alarm For Your Car Licence looking a bit dodgey? This speed alarm will help keep you within the legal limits – by John Clarke 40  A 2-Axis Robot with Gripper At last! – a really simple robot that’s easy to build. This one comes as a kit and you drive it from the serial port of your PC – by Graeme Matthewson 54  Loudness Control For Car Hifi Systems Simple circuit boosts the highs and lows so that you don’t have to wind the wick up so far – by Rick Walters 60  Stepper Motor Driver With Onboard Buffer This new design stores the instructions for up to 63 revolutions and can be set for forward or bidirectional stepping – by Rick Walters Build A Speed Alarm For Your Car – Page 24 84  Power Supply For Stepper Motor Cards Versatile design provides fixed +5V, +12V and +18V supply rails and is easy to build – by Rick Walters SPECIAL COLUMNS 53  Satellite Watch News and updates on satellite TV – by Garry Cratt 68  Serviceman’s Log Encounters with a notebook PC – by the TV Serviceman Loudness Control For Car Hifi Systems – Page 54 76  Radio Control How servo pulses are transmitted – by Bob Young 80  Vintage Radio Restoring a sick Radiola – by John Hill DEPARTMENTS   2  Publisher’s Letter 38  Circuit Notebook 72  Product Showcase 75  Order Form 89  Ask Silicon Chip 95  Market Centre 96  Advertising Index Stepper Motor Driver With Onboard Buffer – Page 60 December 1997  1