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Sound Activated Switch

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grenlem

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Good afternoon, I was a attempting to build a sound activated switch. I found a schematic online that was intended for a PCB. However, I built the circuit on a breadboard. The problem is that the sound will activate, but not deactivate the switch. It just stays on. Everything appears to be connected, so I don't know where to start troubleshooting. Here is the circuit below. if you could point me in the right direction I would appreciate it, thanks.

Free Schematic Diagram at www.circuitdiagram.net
 
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