Sound Activated Switch Circuit

210

03:17:39

At lower left, where 1 k ohm resistor is should be an electret microphone.    To simulate, the switch, 1 uf capacitor, and 1 kHz generator is added.  This allows for lamp to suddenly turn on when sound happens to give impression someone is inside.  This can be powered from 5 volt to 12 volt battery.

Note when first powered on relay comes on during charging of 4.7 uf capacitor and should turn back off in a few seconds.  Change timing by this capacitor using 4.7 uf through 47 uf values.  To change microphone sensitivity, adjust upper left 5.6 k ohm resistor using trail and error to set response to sound at level you desire.

published 10 years ago

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