21 December 2006

Do you have cordless drills or other battery-powered tools lying unloved and unused because their batteries have failed? Don't do the usual and buy another one because they're so cheap: think of the planet and resurrect the ones you have! And then build our new power tool charger to really care for your batteries!

20 December 2006

During mid-2006, Australian emergency health care providers and first aid bodies largely fell into line with the Australian Resuscitation Council guidelines for the delivery method and timing of cardio-pulmonary resuscitation - or CPR. Here's a low-cost trainer which provides audible beats to get the timing right.

19 December 2006

Developed during the 1960s, hybrid car radios combined a valve front-end with an audio output stage based on germanium transistors. They quickly replaced valve-based designs with vibrator power supplies but were themselves made obsolete within a few years.

18 December 2006

You've got to be extremely careful with microwave ovens - even a "dead" one can kill you! Here's how to render it safe and salvage some very useful parts.

16 December 2006

Last month, we showed you how to use the PICAXE Net Server (PNS) to control a motor and monitor a switch in a pet feeder via the Internet. As promised, this month we look at a more sophisticated monitoring system.

15 December 2006

Imagine watching a TV set that's now 50 years old - one that was made long before the introduction of colour TV in Australia! Of course, this particular set has had a few repairs during those 50 years.

14 December 2006

Cheap battery drills are very wasteful

13 December 2006

Last month, we unveiled our new low-cost microwave Doppler Radar Speed Gun, designed for measuring the speed of cars, bikes, boats, horses and even human sprinters. This month, we show you how to build it and describe how it is used.

12 December 2006

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.

07 December 2006

Going bush in the 4WD or camper? Want to add a second battery for security and safety? Here's the safe way to do it.