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Contents Vol.19, No.10; October 2006 SILICON CHIP www.siliconchip.com.au Features    8  Thomas Alva Edison – Genius, Pt.2 The fascinating story of an inventive genius – by Kevin Poulter   22  Review: The CarChip E/X This brilliant little device plugs straight into your car’s On-Board Diagnostics (OBD) port and logs all sorts of data – by Julian Edgar   94  Review: Merlin Broadcast Quality Audio Mixer A broadcast-quality unit designed for schools, colleges, training and even community radio stations Pro jects To Build LED Tachometer With Dual LED Displays – Page 26.   26  LED Tachometer With Dual Displays, Pt.1 Jazz up your car’s dashboard with this unit. It features both digital and circular bargraph readouts, all based on high-brightness LEDs – by John Clarke   36  UHF Prescaler For Frequency Counters It divides input frequencies by 1000 and can extend the frequency range of virtually any frequency counter to over 2.8GHz – by Jim Rowe   46  Infrared Remote Control Extender Want to control equipment via remote control from another room in the house? This new unit works with all the latest gear – by John Clarke   66  PICAXE Net Server, Pt.2 Accessing the PICAXE Net Server via the Internet – by Clive Seager UHF Prescaler For Frequency Counters – Page 36.   72  Easy-To-Build 12V Digital Timer Module Looking for a low-cost 12V digital timer? Just “rat” a commercial 240V timer and add a few extra bits – by Bill deRose 102  A Reformer For Electrolytic Capacitors Resurrect those old electros with this simple unit – by Rodney Champness Special Columns  61 Serviceman’s Log Muggins & his bargain LCD monitors – by the TV Serviceman  84 Circuit Notebook (1) Battery Capacity Tester; (2) Temporarily Silencing A Smoke Detector; (3) Cheapskate’s Headset Adapter; (4) Reservoir Pump Controller Infrared Remote Control Extender – Page 46.  89 Salvage It! Building a super bicycle light alternator – by Julian Edgar   98  Vintage Radio Reforming electrolytic capacitors – by Rodney Champness Departments   2 Publisher’s Letter   4 Mailbag  35 Order Form  77 Product Showcase siliconchip.com.au 104  Ask Silicon Chip 107  Notes & Errata 110  Market Centre 12V Digital Timer – Page 72. October 2006  1