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Contents Vol.12, No.12; December 1999 FEATURES 4 JBL’s 21st Century Loudspeaker Technology How they developed ribbon wire and dual voice coils – by Louis Challis 10 Review: Denon AVC-A1D AV Surround Amplifier 5.1 channels plus Dolby Digital plus DTS plus THX plus . . . Hey, it’s got the lot! – by Leo Simpson 64 Internet Connection Sharing Using Hardware IP gateways are fast and easy to set up and don’t extra require software. You also get a bonus DHCP server and firewall – by Greg Swain 82 Electric Lighting; Pt.16 Microwave sulphur lamps – by Julian Edgar 92 Index To Volume 12 All the articles, projects and columns for 1999 PROJECTS TO BUILD 23 Build A Solar Panel Regulator It works on 12V and 24V systems and has an LCD to show the battery voltage or current – design by Alan Bonnard 12V/24V Solar Panel Regulator – Page 23. 32 The PC Powerhouse Connects to your PC’s power supply and gives fixed +12V, +9V, +6V and +5V rails – design by Barry Hubble 36 The Fortune Finder Metal Locator A simple, low-cost metal detector that works – by John Clarke 54 Speed Alarm For Cars, Pt.2 Second article has all the construction details – by John Clarke 70 Railpower Model Train Controller; Pt.3 Don’t need infrared remote control? Here’s how to modify the circuit for a hard-wired walk-around throttle – by John Clarke SPECIAL COLUMNS 18 Serviceman’s Log All the same, only different – by the TV Serviceman The PC Powerhouse – Page 32. 76 Vintage Radio The Astor KM that blew its power plug off! – by Rodney Champness DEPARTMENTS 2 28 30 53 80 Publisher’s Letter Product Showcase Circuit Notebook Subscriptions Form Electronics Showcase 88 90 94 96 Ask Silicon Chip Notes & Errata Market Centre Advertising Index The Fortune Finder Metal Locator – Page 36. DECEMBER 1999  1