1 Dec, 2007

Here's an improved version of the very popular voice recorder design we published in May 2005. It can now be set up easily to record two, four or eight different messages for random-access playback or a single message for 'tape mode' playback. Also, it now provides cleaner and glitch-free line-level audio output suitable for feeding an amplifier or PA system. It can be powered from any source of 9-14V DC.

1 Dec, 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.

1 Dec, 2007

Do you have trouble understanding what's being said on the TV? Do you need the volume cranked up too loud for everyone else? Do you have a hearing aid as well? If you said yes to any other these questions, here is your answer: an infrared transmitter and receiver to let you listen to the TV sound via headphones. That way, you can listen as loudly as you like, without disturbing anyone else.

1 Dec, 2007

With Australia celebrating 50 years of television last year, I thought I should celebrate the occasion and restore a TV set that was around not long after it started. But like the hare in Mrs Beaton's cookbook, I first had to catch my set...

1 Dec, 2007

Last month, we published the circuit of the Water Tank Level Meter and described how it worked. This month, we show you how to build both the basic and telemetry versions and detail the installation.

1 Dec, 2007

1 Dec, 2007

Last month, we published the circuit details of our new CD-ROM Player Adaptor and described its operation. This month, we show you how to build it.

1 Dec, 2007

Mauro Grassi takes an in-depth look at Rohde & Schwarz' new FM300 Spectrum Analyser and SM300 Signal Generator

1 Dec, 2007

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1 Dec, 2007

This month, I've got rather a mixed bag, ranging all the way from a car stereo CD player to an Apple iMac monitor and on to widescreen plasma TV sets. It's all in a day's work.

1 Dec, 2007

Electric cars are viable right now

1 Dec, 2007

These new speakers are among the very best kit speakers that money can buy. They use the very-high-performance Fountek ribbon tweeters and Peerless woofers. They will be a very good match to our recently described 20W Class-A Stereo Amplifier.

1 Dec, 2007

Like many manufacturers, Kriesler built numerous 5-valve, dual-wave receivers with quite good performance. The 11-59 receiver was aimed at the low-priced end of the market but its performance was still quite acceptable, with good reception on the shortwave stations.