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Contents
Vol.22, No.5; May 2009
www.siliconchip.com.au
SILICON
CHIP
Features
12 Tech Support: Terror Tales From The Front Line
You wouldn’t believe some of the idiotic calls that computer tech support
people get; but then again you just might – by Barrie Smith
16 HID Lamps: Out Of The Car & Over Your Shoulder
It’s taken a while but high-intensity discharge (HID) lamps are now available in
hand-held spotlights. Here’s a look at Jaycar’s ST-3369 – by Ross Tester
Dead-Accurate 6-Digit
GPS-Locked Clock – Page 20.
70 Why Calibrate Your Test Equipment?
If you work in industry, it’s vital that your test equipment is correctly calibrated.
Here’s why – by Tony Tong
72 How To Draw Circuit Schematics In Protel Autotrax
Here’s an easy way to make your circuit diagrams look good – by Rick Walters
Pro jects To Build
20 Dead-Accurate 6-Digit GPS-Locked Clock, Pt.1
Looking for a digital clock that’s always dead accurate? This one is locked to
GPS time signals, so it never needs setting or adjusting – by Jim Rowe
36 230VAC 10A Full-Wave Motor Speed Controller
230VAC 10A Motor Speed
Controller – Page 36.
It gives smooth control from near zero to full speed on electric drills, routers,
circular saws & other appliances with universal motors – by John Clarke
62 Precision 10V DC Reference For Checking DMMs
Check your DMM’s accuracy with this simple device. It provides a precision
10V DC reference that’s accurate to within ±3mV – by Jim Rowe
80 UHF Remote 2-Channel 230VAC Power Switch
Long range (80-metres) unit uses pre-built UHF transmitter & receiver modules
to make it easy to build – by Branco Justic & Ross Tester
88 Input Attenuator For The Digital Audio Millivoltmeter
Precision 10V DC Reference
For Checking DMMs – Page 62.
Extend the range of the SILICON CHIP Digital Audio Millivoltmeter with this
easy-to-build switched input attenuator – by Jim Rowe
Special Columns
30 Circuit Notebook
(1) 12V Regulated Inverter Supply; (2) Solar Panel Tracker Uses LED Sensors;
(3) Picaxe-Based Solar HWS Boost Control; (4) 3-Stage Dimmer For Mountain
Bike Light; (5) Reticulation Valve Locator; (6) Overvoltage Protection For DC
Loads; (7) Preamplifier For Speed Controller
57 Serviceman’s Log
The real meaning of eternity – by the Serviceman
UHF Remote 2-Channel
Mains Switch – Page 80.
92 Vintage Radio
The Astor Football GR/GRP 3-Valve TRF Receiver – by Rodney Champness
Departments
2
4
29
79
Publisher’s Letter
Mailbag
Order Form
Product Showcase
siliconchip.com.au
96 Ask Silicon Chip
99 Notes & Errata
102 Market Centre
Input Attenuator
For The SC Digital Audio
Millivoltmeter – Page 88.
May
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