The circuit is based around an IC that ensures very high sensitivity. Any sound will be captured by the microphone and will activate the output relay which will remain activated while there is sound. It has many applications such as controlling a tape recorder in seminars and classrooms (the recorder will start recording only when the speaker starts speaking). Relay: 3A @ 110V AC. Supply voltage: 12V DC @ 50mA. Recommended adapter: RP-9200-P.
