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Contents Vol.11, No.1; January 1998 FEATURES   4  Understanding Electric Lighting; Pt.3 We describe the development of fluorescent lamps and take a look at how they work – by Julian Edgar 14  Compasses: From Magnetite To Digital New electronic compasses offer digital readout and unprecedented accuracy PROJECTS TO BUILD Build Your Own 4-Channel Light Show – Page 18 18  Build Your Own 4-Channel Lightshow New low-voltage unit controls four lighting channels and features several chaser patterns plus music modulation – by Leo Simpson & Rick Walters 28  Command Control System For Model Railways At last! – a Command Control system for Aussie enthusiasts. This one is easy to build and can control up to 16 locomotives – by Barry Grieger 58  Pan Controller For CCD Video Cameras Low-cost panning circuit controls two servos and draws no current while the camera is stationary – by Branco Justic 64  Build A One Or Two-Lamp Flasher Command Control System For Model Railways – Page 28 Use it to draw attention to a sign or display, or to liven up a party. The simple circuit drives 12V 20W or 50W halogen lamps – by John Clarke SPECIAL COLUMNS 40  Serviceman’s Log A clear case of sabotage – by the TV Serviceman 49  Vintage Radio A simple regenerative receiver – by John Hill 70  Radio Control Jet engines in model aircraft – by Bob Young Pan Controller For CCD Video Cameras – Page 58 76  Computer Bits Norton Utilities V2: hard disc maintenance for PCs – by Jason Cole DEPARTMENTS   2  Publisher’s Letter 37  Order Form 38 Mailbag 45  Product Showcase 74  Circuit Notebook 82  Ask Silicon Chip 85  Notes & Errata 86 Market Centre 88  Advertising Index Build A One or Two-Lamp Flasher – Page 64 January 1998  1