This is a simple Audio or voice Operated Switch Circuit Diagram. The
sound picked up by SPKRl, which acts as a microphone, is fed to
transistor amplifier Ql. The output of Ql is applied across coupling
transformer T1 and is used to drive the gate circuit of Triac TRl. TRl
is used to lend a latching effect to the action of the relay.
Audio Operated Switch Circuit Diagram
Sourced By: Circuitsstream
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