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Contents SILICON CHIP www.siliconchip.com.au Vol.26, No.10; October 2013 Features   12  Fit Your Cordless Drill With A Lithium Battery Pack Do you have a perfectly good cordless drill or other tool with a dead Nicad battery pack? Refurbish it with a lithium-polymer battery pack for more power, less weight and greater capacity – by Leo Simpson Integrated SDR Using A Tunable Front End & DVB-T Dongle, Pt.1 – Page 18.   53  Narrow-Band Digital Two-Way Radio Professional two-way radio is increasingly going digital, offering much clearer signals, more users in the same amount of spectrum space and many other advantages. Here’s a quick look at the technology – by Kevin Poulter Pro jects To Build   18  SiDRADIO: An Integrated SDR Using A DVB-T Dongle, Pt.1 This low-cost communications receiver houses a USB DVB-T dongle plus all the circuitry for an Up-Converter and RF preselector. It covers from 100kHz to over 2GHz and is powered from your PC via a USB cable – by Jim Rowe   30  “Tiny Tim” Horn-Loaded Speaker System You won’t believe how good this low-cost speaker system sounds. It uses a single 4-inch driver, has surprisingly good bass and treble response and only needs a low-power amplifier to drive it – by Allan Linton-Smith & Ross Tester   56  “Tiny Tim” 10W/Channel Stereo Amplifier, Pt.1 Here’s the perfect partner for the “Tiny Tim” speakers. It’s great for beefing up the sound from your TV and includes Toslink and S/PDIF inputs to accept the TV’s digital sound output – by Nicholas Vinen & Leo Simpson “Tiny Tim” Horn-Loaded Speaker System – Page 30.   70  Automatic Car Headlight Controller Do you forget to turn on your car’s headlights? Or do you turn them on later than you should? Build this automatic headlight controller and make sure you’re visible to other drivers at all times – by Nicholas Vinen & John Clarke Special Columns  40 Serviceman’s Log Servicemen watching other servicemen servicing – by Dave Thompson  66 Circuit Notebook “Tiny Tim” 10W/Channel Stereo Amplifier, Pt.1 – Page 56. (1) Door Sentry Uses Encoded Infrared Beam; (2) Energy Measurement Using The USB Power Monitor; (3) PIC-Based Noisemaker Circuit For Electric Wheel-chairs & Scooters   82  Vintage Radio A rare 1929 AWA C54 Radiola set rescued from oblivion – by Leith Tebbit Departments   2 Publisher’s Letter   4 Mailbag  38 Product Showcase  81 Subscriptions siliconchip.com.au 88 Online Shop 91 Ask Silicon Chip 95 Market Centre 96 Notes & Errata Automatic Car Headlight Controller – Page 70. October 2013  1