| Although good and inexpensive integrated analogue-to-digital (A-D) converters are now readily available, it may be instructive to build o...
Ton Giesberts (354)
| The circuit detects a change in video information and uses this to switch on an alarm in a closed-circuit television guard system of a vi...
| MOSFET output transistors should be as near-identical as possible, irrespective of whether they are complerilentary pairs or connected...
| Not all CD players have a digital output, which is a must if the player is to be connected to an external DAC or digital recorder. Since i...
| The prototype loudspeaker system is housed in a 90 cm (36 in) high enclosure, details of which are shown in this article. The drive unite...
| It often happens that someone wants to watch television without the sound disturbing other people in the room. To avoid having a long cab...
| This audio-frequency receiver is the counterpart of the infra-red transmitter. The output from the infra-red diode D1 is amplified by IC1...
| Pulse duration modulators require a perfect triangular signal, that is, one that is absolutely symmetrical with straight sides. Any devia...
| Nowadays, the design of preamplifiers is almost invariably based on integrated circuits. However. there are still many constructors who l...
| High-order filters are normally designed by using two or more 2nd order sections in series. This means that a 4th-order filter needs at l...