This circuit is a variation of the “Two Tone” siren that is a standard for the LM555 timer. The circuit allows the output frequency of the ‘B’ timer to ‘sweep’ between two frequencies rather than switching abruptly between two fixed frequencies. [...]
Read More Source: http://home.cogeco.ca/~rpaisley4/LM555.html
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This entry was posted on Monday, September 14th, 2009 at 7:48 am and is filed under 555, Audio - Alarm.
