1 May, 2007

New 20W class-A module is a step closer to perfection

3 May, 2007

It's normally preferable to stick to servicing equipment that you know well in order to stay out of trouble. However, the whiff of cash can often tempt me to try my luck in fields outside my usual experience. In the long run though, it is the familiar stuff which pays the bills.

4 May, 2007

On 16th January this year, the Jaycar Sunswift III solar car rolled into Sydney after five and a half days on the road from Perth, shattering the previous West-East Transcontinental Record by three days. The UNSW Solar Racing Team is to be congratulated for their tremendous achievement.

8 May, 2007

Want a regulated voltage that can be adjusted to suit your application? This Adjustable Power Supply is small, easy to build and can be adapted to produce a fully regulated voltage ranging from 1.3V to 22V at currents up to 1A.

12 May, 2007

Radio museums can tell us much about our radio history, as well as preserving many worthwhile items that would otherwise be lost. One of the best is at Kurrajong in NSW, just west of Sydney.

14 May, 2007

This new 20W class-A is a refinement of our very popular 15W class-A module published in July & August 1998. It features ultra-low distortion levels, very low noise levels and a greatly simplified power supply which improves overall efficiency. Since it runs in pure class-A mode, there is no crossover distortion at all.

21 May, 2007

In Pt.2, we described how to build all the modules that comprise the Programmable Ignition System. This month, we describe the installation and setting up procedures and show you how to plot the ignition timing.

23 May, 2007

Last month, we presented the High-Power Reversible DC Motor Speed Controller. Here is a companion controller which works with a motorcycle-style throttle control. It also features a forward/reverse switch to control the motor direction.

26 May, 2007

The short term frequency stability of the GPS-Based Frequency Reference described in the March and April issues can be improved with some circuit changes, as described here. It's also quite easy to add an RS-232C serial output, so the NMEA data stream from the GPS receiver module can be fed out to a PC for other purposes.

28 May, 2007

Interesting circuit ideas which we have checked but not built and tested. Contributions from readers are welcome and will be paid for at standard rates.