Ton Giesberts (358)

1-07-2009 | Considering its low cost, a commercial walkie-talkie (PMR) set are very suitable for use as a wireless baby monitor, with the addition of se...

1-07-2009 | This circuit was specially designed to be used with the FM Audio Transmitter found elsewhere in the Summer Circuits 2009 issue, but it can a...

1-07-2009 | One way to detect AC power current and generate a reasonably constant voltage independent of the load is to connect a string of diodes wired...

1-07-2009 | Here's how to use commercial wireless audio/video modules to transfer an S/PDIF signal. The S/PDIF signal is connected directly to the video...

1-06-2009 | There are plenty of designs for simple audio power amplifiers. These generally have a class-AB or class-B topology. Here we present a very c...

1-06-2009 | Those of you who go camping regularly will have experienced this before: you switch on a powerful electric hob just when the fridge is on an...

1-06-2009 | The amount of negative oxygen ions in the ambient air seems to affect the psychological and physical state of many people. The air in the mo...

1-04-2009 | In February 2009 we published a monaural mini FM receiver. A matching stereo decoder will naturally make this receiver complete. In this min...

1-04-2009 | In many cases, the load connected to a voltage regulator is not returned to ground but to an even lower voltage or perhaps even the negative...

1-02-2009 | These days tiny FM radios are often integrated in many portable devices such as mobile phones and MP3 players. But why not make a simple rec...