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Miscellaneous - list of circuit diagrams
This circuit allows audio monitoring of a remote location and so doubles as a room monitor or baby alarm
author: Andy Collinson visits: 240 
Another Circuit by Rev.Thomas Scarborough
author: Rev.Thomas Scarborough visits: 232 
Circuit with a variable pitch and a relatively loud 82 dB miniature piezo beeper. The circuit is very simple and can be easily assembled in half an hour
author: Tomaz Lazar - Ljubljana, Slovenia visits: 221 
This circuit takes an ordinary loudspeaker and allows it to be used in reverse, as a microphone
author: visits: 202 
This circuit will illuminate a LED if one of your telephones is in use. It should work in all countries (Including UK) that have a standing line voltage above 48 Volts DC
author: Miroslav Adzic visits: 161 |
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