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STD Audio Detector Switch

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Update time: 2021-05-24 07:40:43
Creation time: 2014-07-03 04:33:30
Description
Two similar circuits: A) Automatic input selector: If input A is connected to the output, if input B has audio signal the circuit switches to input B. B) Detect audio signal to switch relay on and after some time off again when the music has stopped.
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