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Contents Vol.27, No.2; February 2014 SILICON CHIP www.siliconchip.com.au Features   11  PICAXE in Space – Controlling A Miniature Satellite Launched last November, $50SAT is not much bigger than a cigarette packet and uses a PICAXE micro to control a radio motherboard – by Clive Seager   36  Rubidium Frequency Standards: How They’ve Shrunk Now available on eBay for less than $150, rubidium-vapour frequency standards (also known as ‘atomic clocks’) have shrunk considerably in size and cost since they were first developed in the early 1960s – by Jim Rowe   74  Thinking Inside The Box . . . Or Cases On The Cheap Looking for a cheap project case? Here’s a really neat idea – by Stan Swan 230V/10A Speed Controller For Universal Motors; Pt.1 – Page 14.   78  Review: Triarchy USB Mini Spectrum Analyser Yet another low-cost dongle: this time it’s a spectrum analyser and it offers impressive performance from 1MHz right up to 5.35GHz – by Jim Rowe   89  High-Bay LED Lighting For Warehouses Mercury discharge lamps are the standard for factories and warehouses but now high-intensity LED lamps are a more efficient alternative – by Ross Tester Pro jects To Build   14  230V/10A Speed Controller For Universal Motors, Pt.1 This microprocessor-controlled design provides very smooth operation from low speed right up to maximum speed and has comprehensive overload protection – by John Clarke Stereo Echo & Reverberation Unit – Page 28.   28  Stereo Echo & Reverberation Unit Need echo and reverb effects for audio recording, PA and band applications? This easy-to-build module will do it for you, with high performance and low noise/distortion – by Nicholas Vinen   42  Build A State-Of-The-Art Mini Entertainment Unit Transform a car radio and loudspeakers into a comprehensive entertainment unit which has AM/FM stereo reception and can play music from CDs, flash drive, MP3 player, iPhone, iPod, Android phone etc – by Leo Simpson   84  PortaPAL-D: A Powerful, Portable PA System, Pt.3 It’s now time to put together the cabinet which houses the electronics module and the two speakers to make lots of beautiful music – by John Clarke Build This State-Of-The-Art Mini Entertainment Unit – Page 42. Special Columns   57  Serviceman’s Log Fixing smartphones & tablets can be tricky – by Dave Thompson  66 Circuit Notebook (1) Audio Decibel Meter Uses Logarithmic Converter; (2) Making A Cheap USB-Powered PCB Drill; (3) Minimum Speed Adjustment For Induction Motor Speed Controller; (4) PICAXE-Based Garage Door Controller  82 Salvage It! Harvesting a dead PC motherboard for parts – by Bruce Pierson   92  Vintage Radio A 1925 Freed-Eisemann Neutrodyne Radio – by Kevin Poulter & Stan Snyders Departments     2 Publisher’s Letter siliconchip.com.au   4 Mailbag  26 Online Shop PortaPAL-D PA System: Building The Cabinet – Page 84.  65 Subscriptions  98 Ask Silicon Chip 103 Market Centre February 2014  1