15 April 2007

This reversible DC motor speed controller uses a switchmode Mosfet bridge circuit that drives the motor. It can be controlled by a 1-2ms pulse train from a radio control system or by a single potentiometer to give forward/reverse throttle control. It can operate from 12V or 24V batteries at currents up to 20A with just four Mosfets in the bridge circuit.

09 April 2007

SPLat Controls, an Australian company that produces a range of home-grown industrial-strength controllers, recently added the credit-card sized 'CC16' to their line-up. This new controller sells for less than $100 yet includes many of the features of SPLat's more sophisticated controllers.

19 March 2007

Here's one of those really handy little projects that will cost very little but make life a whole lot easier when you want to measure voltage and current at the same time.

17 March 2007

Second article completes the construction & gives the set-up procedure

15 March 2007

While its origins were in the 19th century, it is widely recognized that radio - and in particular broadcast radio - was one of the most significant developments of the 20th century.

13 March 2007

Want to program the ignition timing on your car? Now you can, with this completely new design. It can be used in older cars which presently do not have electronic ignition or used as an "interceptor" for cars with engine management systems.

11 March 2007

Need a source of very accurate 10MHz and 1MHz signals for calibrating frequency counters, radio receivers and signal generators? Here's just what you need: a frequency reference which is linked to the Global Positioning System (GPS) satellites, to take advantage of their highly accurate on-board caesium-beam "atomic clocks".

05 March 2007

Silicon. One of the Earth's most prolific substances, yet so important in our 21st century lives - from computers to disc technology - and glass.

27 February 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.

26 February 2007

Are you intending to build the Variable Boost Control described earlier? If so, you will need to built this simple Fuel Cut Defeater (FCD) to eliminate the standard factory fuel cut which typically occurs at boost levels about 16-17psi. The unit is not adjustable, so no external controls are required.