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Contents SILICON CHIP www.siliconchip.com.au Vol.26, No.5; May 2013 Features 12 Get A Software Defined Radio For $25 It’s easy to convert a USB TV dongle to a VHF/UHF software defined radio (SDR) capable of tuning from 50MHz (or lower) up to 2200MHz – by Jim Rowe 24 The Raspberry Pi Single Board Computer Not much bigger than a credit card, the Raspberry Pi is a single board computer running Raspian Linux. Here’s how to get it going – by Geoff Graham 29 Review: EDS-88A In-Circuit Capacitor Tester Capacitor failure is one of the most (if not the most) common cause of faulty electronics. This unit makes finding faulty caps easy – by Nicholas Vinen Converting A USB TV Dongle To A Software Defined Radio – Page 12 70 The Avalon 2013 Air Show On show: an impressive array of technology ranging from an F-22A Raptor to UAVs to robots, solar powered vehicles & satellites – by Dr David Maddison 82 Review: The “RF Explorer” Spectrum Analyser It fits in the palm of your hand and sells at a bargain price – by Stan Swan Pro jects To Build 30 DC-DC Converter For the CLASSiC-D Amplifier This 12V-Powered DC-DC Converter delivers up to ±35V rails (adjustable) & has 50W continuous power output or 125W peak – by John Clarke 57 High-Performance CLASSiC DAC; Pt.4 Getting Started With The Raspberry Pi Single Board Computer – Page 24. Final article describes how to set it up and test it. We also discuss the unit’s more advanced features, including loudness control – by Nicholas Vinen 64 Do Not Disturb Telephone Timer It takes the phone off-hook for 15, 30, 60, 90 or 120 minutes and restores normal phone operation at the end of the set time – by John Clarke 78 Simple DMM Auto Power-Off Got a cheapie DMM which eats batteries because there’s no auto power-off facility? This low-cost circuit will solve the problem – by Stan Swan 86 Voltage & Current Meters For The New Battery Charger Want to add voltage and current meters to the Bits’N’Pieces Battery Charger? Here’s how – by Ross Tester ±35V DC-DC Converter For The CLASSiC-D Amplifier – Page 30. Special Columns 40 Circuit Notebook (1) 1W LED Driver With Protection; (2) 12V Fan Controller With Up To Four Temperature Sensors; (3) Serially-Controlled, Expandable 7-Segment Display 44 Serviceman’s Log A frustrating auto-electrical fault 94 Vintage Radio Rescued from a farm: a rare 1948 model 766 Breville radio Departments    2 Publisher’s Letter   4 Mailbag siliconchip.com.au 39 Subscriptions 77 Product Showcase 92 Partshop & Order Form 99 Ask Silicon Chip 103 Market Centre The Avalon 2013 Air Show – Page 70. May 2013  1