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Contents Vol.27, No.10; October 2014 SILICON CHIP www.siliconchip.com.au Features   14  Review: Building The Velleman K8200 3D Printer 3D printers look set to be the next big thing. We take a close look at the popular Velleman K8200 3D printer which you build yourself – by Alan Ford   27  How To Remove Rust By Electrolysis You might be surprised at how easy it is to restore rusted items to their (almost!) former glory using electrolysis – by Dr David Maddison   76  Review: Signal Hound USB-SA44B Spectrum Analyser Currawong Stereo Valve Amplifier Preview – Page 24. USB-powered mini spectrum analysers based on SDR technology are evolving fast. The Signal Hound USB-SA44B compares favourably with high-end selfcontained analysers, for a fraction of their price – by Jim Rowe   88  Review: Rohde & Schwarz HMO1002 2-Channel Scope This ‘entry-level’ digital scope from Rohde & Schwarz features two channels, 50MHz bandwidth and a host of standard features – by Nicholas Vinen Pro jects To Build   24  Currawong Stereo Valve Amplifier: A Preview We swore we’d never do a stereo valve amplifier but we’ve finally given in. This unit uses eight valves, delivers around 10W RMS/channel and even includes remote volume control. Here’s a preview – by Leo Simpson & Nicholas Vinen Courtesy LED Light Delay For Cars – Page 34.   34  Courtesy LED Light Delay For Cars If you swap your car’s interior filament lamps for LED lamps, then the delay circuit may no longer work. This new courtesy light delay works with both filament and LED lamps – by John Clarke   58  Digital Effects Processor For Guitars/Musical Instruments Deceptively simple unit provides 10 different adjustable effects, including echo, reverb, tremolo, fuzz, compression, flanging and phasing – by Nicholas Vinen   66  Passive Direct Injection (DI) Box Hum and noise plaguing your performance? A DI box that converts an unbalanced signal from a musical instrument into a balanced output signal is the answer – by John Clarke Digital Effects Processor For Guitars – Page 58.   82  Create Eerie Music With The Opto-Theremin, Pt.2 Second article on our versatile new Opto-Theremin completes the construction and describes the test and adjustment procedure – by John Clarke Special Columns   42  Serviceman’s Log Sometimes you just have to give it a go – by Dave Thompson  72 Circuit Notebook (1) PICAXE-Based Bistro Paging System; (2) Micromite-Based GPS Dual Clock With 7-Day Alarm   92  Vintage Radio The Mullard 5-10 Ten Watt Valve Amplifier – by Malcolm Fowler Departments   2  Publisher’s Letter   4 Mailbag siliconchip.com.au  57 Subscriptions  87 Online Shop   98  Ask Silicon Chip 103 Market Centre 104 Advertising Index Passive Direct Injection (DI) Box – Page 66. October 2014  1