Fullscreen HTML5Med Res (??MB)HTML4

Contents SILICON CHIP www.siliconchip.com.au Vol.26, No.1; January 2013 Features 14 The Bright Present & Brighter Future Of LED Lighting LEDs are fast becoming the devices of choice for artificial lighting. Here’s a look at the latest in LED technology – by Dr Faiz Rahman 20 The Sydney HiFi Show Big speakers, bigger amplifiers and fancy video projectors; they were just some of the products at this year’s Australian Audio & AV Show recently held in Sydney – by Allan Linton-Smith 62 Review: Marantz NA7004 Network Audio Player It may have a prosaic name but this Marantz hifi tuner is one of the few units that will provide the best audio reproduction from such diverse sources as DAB+, AM, FM, USB, iPod and the internet. It will also function as a high quality DAC and can handle Toslink and coax digital signals – by Leo Simpson Marantz NA7004 Network Audio Player Review – Page 62. Champion Preamp & Audio Amplifier Module – Page 24. Pro jects To Build 24 The Champion Preamp/Audio Amplifier Module It’s based on an AN7511 bridge output amplifier IC, can deliver up to 7W peak power and features an optional preamp circuit – by Nicholas Vinen 36 Build A Solar-Powered Skylight Don’t pay a lot of money for a skylight to be installed. Use a solar panel and a few ultrabright LEDs instead to achieve effectively the same thing but for less dollars – by Ross Tester 54 Garbage & Recycling Reminder Need reminding when to put the bins out? Can’t remember whether it’s a recycling week or a greens week? This easy-to-build project flashes coloured LEDs on the due day to indicate which bins should go out – by John Clarke 68 A 2.5GHz 12-Digit Frequency Counter, Pt.2 Second article this month describes the assembly and details the simple setting up procedure – by Jim Rowe 80 Performance Tweak For The Ultra-LD Mk.3 Amplifier Isn’t the Ultra-LD Mk.3 amplifier module supposed to be perfect? Well, there’s always the next step. Here’s a simple modification to improve its performance when it is grossly overloaded – by Leo Simpson Garbage & Recycling Reminder – Page 54. Special Columns 32 Circuit Notebook (1) Full Duplex Intercom Using Telephones With Tone Dialling; (2) Simple Variable Dynamic Load For Testing Power Supplies; (3) Simple LED Switch Has Timeout Function; (4) 400Hz 115VAC Sinewave Supply 40 Serviceman’s Log Tracking Biggles the cat with a mini-GPS 86 Vintage Radio The National SW5 battery-powered “Thrill Box” shortwave receiver Departments   2 Publisher’s Letter   4 Mailbag siliconchip.com.au 53 Subscriptions 78 Product Showcase 85 91 95 96 Order Form Ask Silicon Chip Market Centre Notes & Errata Building The 2.5GHz 12-Digit Frequency Counter – Page 68. January 2013  1