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Contents SILICON CHIP www.siliconchip.com.au Vol.27, No.1; January 2014 Features 12 Arduino-Controlled Fuel Injection For Small Engines Experiment with electronic fuel-injection for your 4-stroke lawnmower using this simple Arduino-based system – by Nenad Stojadinovic 82 Review: Rigol DS1104Z-S Digital Storage Oscilloscope Compact, low-cost 4-channel digital scope boasts advanced features that would have cost a fortune not too long ago – by Nicholas Vinen Arduino-Controlled Fuel Injection For Small Engines – Page 12. 86 The Sydney Mini Maker Faire We visit the “Mini Maker Faire”, an exhibition of various groups and businesses dedicated to people building stuff – by Nicholas Vinen Pro jects To Build 20 Bass Extender Mk2 For HiFi Systems Want more bass from your speakers? The Bass Extender Mk2 can give a big improvement in bass response for very little outlay – by Nicholas Vinen 30 PortaPAL-D: A Powerful, Portable PA System, Pt.2 Bass Extender Mk2 For HiFi Systems – Page 20. Second article on our new go-anywhere portable PA system shows you how to build the PCBs, mount them on two L-shaped aluminium panels and connect them together – by John Clarke 58 Build A LED Party Strobe Using high-power LED arrays, it’s easy to make a safe party strobe which will give a good display yet won’t break the bank – by Ross Tester & Nicholas Vinen 68 Li’l Pulser Mk2: Fixing The Switch-Off Lurch A design flaw in our Li’l Pulser Model Train Controller Mk2 means that at switchoff, any locomotive(s) on the track can suddenly lurch forward, even if they were stationary. Here’s how to fix the problem – by Nicholas Vinen & Leo Simpson 88 “Tiny Tim” 10W/Channel Stereo Amplifier, Pt.3 Final article shows how to assemble the unit into the case, complete the wiring and do the testing – by Nicholas Vinen & Leo Simpson Special Columns Building The PortaPAL-D PA System – Page 30. 40 Serviceman’s Log A typical day in my working life – by Dave Thompson 46 Salvage It! Wrecking a dead PC power supply for parts – by Bruce Pierson 76 Circuit Notebook (1) Pseudo-Random Timer For A Bird Scarer; (2) Universal Numeric Display For Controllers Running Maximite Basic; (3) Door Minder Senses Air Pressure And Plays A Tune 94 Vintage Radio Philco Safari: the first transistor portable projection TV set – by Ian Batty Departments 2 Publisher’s Letter   4 Mailbag siliconchip.com.au 19 Subscriptions 57 Product Showcase 67 99 103 104 Online Shop Ask Silicon Chip Market Centre Notes & Errata Build A LED Party Strobe – Page 58. January 2014  1