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Contents Vol.10, No.2; February 1997 FEATURES 4 Computer Problems: Sorting Out What’s At Fault It pays not to jump to conclusions when your computer plays up. We take a look at a couple of typical problems – by Greg Swain 66 Cathode Ray Oscilloscopes; Pt.6 Digital oscilloscopes can give misleading results if not used correctly. Here’s how to interpret the on-screen display – by Bryan Maher PROJECTS TO BUILD 10 PC-Controlled Moving Message Display This easy-to-build moving message display plugs into your PC’s parallel port. You just type the message in on the keyboard – by John Western COMPUTER PROBLEMS: SORTING OUT WHAT’S AT FAULT – PAGE 4 16 Computer Controlled Dual Power Supply; Pt.2 This month, we describe the interface board that lets you control the supply from your computer – by Rick Walters 24 The Alert-A-Phone Loud Sounding Alarm This very loud ringer plugs in parallel with your existing telephone and is Austel approved – by Derek Diggles 40 Build A Low-Cost Analog Multimeter You can learn about multimeters and kit assembly by building this simple unit. And you’ll wind up with a useful test instrument – by Leo Simpson BUILD A PC-CONTROLLED MOVING MESSAGE DISPLAY – PAGE 10 56 Control Panel For Multiple Smoke Alarms, Pt.2 The full construction and installation details are in this month’s issue. Build it and control up to 10 smoke detectors – by John Clarke SPECIAL COLUMNS 30 Serviceman’s Log Don’t monkey with a VCR – by the TV Serviceman 53 Satellite Watch The latest news on satellite TV – by Garry Cratt 74 Radio Control THE ALERT-A-PHONE LOUD RINGER – PAGE 24 How models can be lost through interference – by Bob Young 86 Vintage Radio The combined A-B battery eliminator – by John Hill DEPARTMENTS 2 38 54 82 90 Publisher’s Letter Mailbag Circuit Notebook Product Showcase Back Issues 92 93 94 95 96 Ask Silicon Chip Notes & Errata Order Form Market Centre Advertising Index CONTROL PANEL FOR MULTIPLE SMOKE ALARMS – PAGE 56 February 1997  1