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Voice Operated Switch - 2

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The sound picked up by SPKR1, which acts as a microphone, is fed to transistor amplifier Q1. The output of Q1 is applied across coupling transformer T1 and is used to drive the gate circuit of Triac TR1. TR1 is used to lend a latching effect to the action of the relay.


Parts List:
Component: Value: Datasheet: Qty:
Resistor

250K

Not Available 02
Resistor 10K Pot Not Available 01
Resistor 1.5K Not Available 01
Capacitor 10, 16V Not Available 01
Capacitor 0.47uF Not Available 01
Transformer 10:1 Not Available 01
Transistor SK3721 Not Available 01
Triac 1A., 200V Not Available 01