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Contents Vol.24, No.10; October 2011 SILICON CHIP www.siliconchip.com.au Features 62 Measuring Audio Gear Without Spending Big Dollars All you need is a PC, a decent sound card (or a USB sound interface), plus an appropriate software package – by Jim Rowe 80 Review: CadSoft EAGLE PCB Layout Software Need to upgrade from Protel Autotrax or Easytrax? CadSoft EAGLE could be the answer and there’s even a free version called EAGLE Light to get you started – by Nicholas Vinen Projects To Build Quizzical: A Quiz Game With A Difference – Page 12. 12. 12 Let’s Get Quizzical: A Quiz Game With A Difference No more boring bells and whistles. This project not only judges the winner but you can have infinite sounds for infinite fun and games – by John Clarke 24 Digital LED Lighting Controller For Christmas Lights Have you thought about controlling lots of LED lights in time to music? This easy-to-build slave unit mates with the master unit described in OctoberDecember 2010 to give an eye-catching display – by Nicholas Vinen 34 Build A Loudspeaker Protector A fault in an amplifier module could set fire to a loudspeaker which could quickly spread to your house. Don’t let it happen to you. This simple circuit disconnects the loudspeaker if an amplifier fault occurs Digital LED Lighting Controller For Christmas Lights – Page 24. 72 The USB MIDI-Mate: A MIDI Interface For PCs Use your PC to link up MIDI synthesisers, keyboards and various instruments. This USB-MIDI interface provides the hardware interface – by Jim Rowe 86 High-Performance Stereo Headphone Amplifier, Pt.2 Second article has all the assembly, testing and adjustment details – by Nicholas Vinen Special Columns 44 Circuit Notebook (1) Substitute For AC Motor Reversing Switch; (2) Simple Lithium-Ion Battery Charger; (3) Timing Laser For Small 2-Stroke Motors; (4) Additional Features For The Digital Inclinometer; (5) AC Source For Testing Pool Salt Concentrat­ ion; (6) Prototyping Board For PICAXE Microcontrollers; (7) Mains Timer Has No Stand-by Power Build A Loudspeaker Protector – Page 34. 57 Serviceman’s Log There’s lots of ways to kill a laptop – by the Serviceman 94 Vintage Radio A look at the Radiola Model 573-MA Receiver – by Maurie Findlay Departments   2   4 42 85 Publisher’s Letter Mailbag Product Showcase Order Form siliconchip.com.au 99 Ask Silicon Chip 102 Coming Next Month 103 Market Centre USB MIDI-Mate: A MIDI Interface For PCs – Page 72. October 2011  1