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Noise Activated switch w/ 2 second delay for switch off

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tbank

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Hello,

I am looking for a schematic for a sound activated switch with a 2 second delay until switching off. This circuit will be used to activate an ultrasonic dog whistle to discourage barking...however, the clap circuits I have seen require an additional clap to turn off. I don't want my dog to get the whistle stuck on as a result of not barking (clapping) enough times. Thanks.
 
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