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Contents Vol.11, No.2; February 1998 FEATURES 4 Surplus Mania: Hot Web Sites For Bits Looking for that special hard-to-find part? You can find lots of goodies at various web sites on the Internet – by Adrian Cuesta 12 Understanding Electric Lighting; Pt.4 The development and operation of high pressure mercury vapour lamps – by Julian Edgar Multi-Purpose Fast Battery Charger – Page 18 PROJECTS TO BUILD 18 Multi-Purpose Fast Battery Charger; Pt.1 New design fast charges NiCd and NiMH power tool batteries and can charge 6V and 12V SLA and car batteries as well – by John Clarke 25 Telephone Exchange Simulator For Testing Use it to test telephone handsets, fax machines, modems, answering machines and automatic diallers in burglar alarms – by Mike Zenere 36 Command Control System For Model Railways; Pt.2 Get your soldering iron out because it’s time to build the Command Station module. We give the full circuit and construction details – by Barry Grieger 60 Demonstration Board For Liquid Crystal Displays Telephone Exchange Simulator For Testing – Page 25 Learn how liquid crystal displays process digital data with this neat little demo board – by Rick Walters 66 Build Your Own 4-Channel Lightshow; Pt.2 We give the constructional details for both DC and AC versions plus some hints on making a display box – by Leo Simpson & Rick Walters SPECIAL COLUMNS 56 Serviceman’s Log The TV set that smoked – by the TV Serviceman 76 Vintage Radio Clean audio for old Henry – by John Hill Demonstration Board For Liquid Crystal Displays – Page 60 80 Radio Control Jet engines in model aircraft; Pt.2 – by Bob Young 88 Computer Bits Norton Utilities V2 for Win95; Pt.2 – by Jason Cole DEPARTMENTS 2 34 44 53 Publisher’s Letter Mailbag Order Form Product Showcase 86 91 94 96 Circuit Notebook Ask Silicon Chip Market Centre Advertising Index Building The 4-Channel Light Show – Page 66 February 1998  1