ES-13    High Reliability Sound Actuated Relay 
 (DC 9V)   (relay contact : 2A)

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This kit responds to hand clapping sound by turning ON / OFF of a relay.  It operates in the bi-stable or toggle mode.  The active high-pass filter (IC1B) filters makes the circuit sensitive only to hand-clapping sound while ignoring other forms of noised. 

Applications : 
sound activated table lamp, . . .