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Issue 248 << Issue 247 | Issue 249 >>
Publishers Letter

1 May, 2009

230VAC 10A Full-Wave Motor Speed Controller

2 May, 2009

This full-range Motor Speed Controller will give smooth control from near zero to full speed on electric drills, routers, circular saws, lawn edgers, food mixers - in fact, any appliances with universal (brush-type) motors.

Tech Support: Terror Tales From The Front Line

4 May, 2009

This story is dedicated to those fearless men and women who, every day, brave dark and stormy phone calls from the unknown, un-named, ill-informed, querulous public; to those who, with no regard for their personal safety nor deep intrusions into their mental sanity, face hurt, shame and embarrassment in their quest to answer the challenging questions they are thrown.

Dead-Accurate 6-Digit GPS-Locked Clock, Pt 1

6 May, 2009

Looking for a digital clock that's always dead accurate? This one derives its time signals from the GPS (Global Positioning Satellite) system, so it never needs setting or adjusting. It features big, bright 58mm-high digits for the hours and minutes, plus smaller digits to indicate the seconds.

HID Lamps: Out Of The Car & Over Your Shoulder

8 May, 2009

It's taken a while but at last, High Intensity Discharge (HID) lamps are starting to appear in places other than just in car headlights.

Precision 10V DC Reference For Checking DMMs

10 May, 2009

Have you ever checked the calibration of your digital multimeter? Yeah, we know - you haven't because there is no easy (read cheap) way of doing it. But now you can with this precision DC voltage reference that can be built in a few hours. Without any need for adjustment it will provide you with a 10.000V DC source accurate to within ?3mV, ie, an accuracy of ?0.03%.

Why Calibrate Your Test Equipment?

12 May, 2009

During preparation of the Precision Voltage Reference project elsewhere in this issue, we consulted with Trio Smartcal on the subject of calibration. This article gives a brief overview.

Mailbag

13 May, 2009

Letters and emails should contain complete name, address and daytime phone number. Letters to the Editor are submitted on the condition that Silicon Chip Publications Pty Ltd may edit and has the right to reproduce in electronic form and communicate these letters. This also applies to submissions to "Ask SILICON CHIP" and "Circuit Notebook".

UHF Remote 2-Channel 230VAC Power Switch

15 May, 2009

If you're looking for a mains "switch" which can be operated from some distance away, this low-cost, simple project could be just what you want. With a UHF remote control and two switched "channels", it needs very little power thanks to the use of latching relays.

How To Draw Circuit Schematics In Protel Autotrax

16 May, 2009

When it comes to contributed projects or circuits, there are few things more frustrating than finding the circuit has been drawn (apparently) by "a thumbnail dipped in tar" - or near equivalent. Here's an easy way to make them look good!

Input Attenuator For The Digital Audio Millivoltmeter

18 May, 2009

If you'd like to be able to use our Digital Audio Millivoltmeter to measure AC voltages up to 140V RMS, this add-on project is the answer. It's a simple switched input divider which lets you add 40dB, 20dB or 0dB of attenuation ahead of the meter at the touch of a knob.

Vintage Radio

19 May, 2009

Manufactured around 1948, the Astor GR/GRP receiver was nicknamed "Football" because of its cabinet shape. It's a low-cost 3-valve TRF set designed for tough times.

Circuit Notebook  - 1 May, 2009

Ask Silicon Chip  - 11 May, 2009

Servicemans Log  - 20 May, 2009

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