Build a simple voice switched microphone controlled circuit diagram. Voice activated control apparatus selectively connects one of a
plurality of microphones to an audio line and inhibits all other
microphones from capturing the line while the initial connection is
maintained. In this circuit an electronic microphone feeds a bandpass filter circuit (IC1A), then feeds a comparator, which in turn drives Ql. Ql is a switch that conducts when audio from IC1B causes Dl, C4, R6, and R7 to bias it ON.
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