This circuit uses a condenser MIC, when it hears a sound, such as your voice, it generates a voltage and sends it to a small buffer stage.
The buffer stage has a provisons for a small time delay capable of ON times from 1 to 60 seconds.
Relay contact output for loads of up to 3 amps 115 volts or 5 amps 12VDC.
Requires 12 volts DC to operate.
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