Relay Peka Suara

Sound Activated Relay, #1

Parts List:
Rx = 10K Cbias,C1,C2 = 0.1uF, ceramic Q1 = 2N2222,2N3904, etc.
R1 = 1K C3 = 1uF, electrolytic IC1 = 741 op-amp
R2 = 100K C4,Cx = 10uF, electrolytic MIC = Electret Mike, 2-wire
R3 = 100K Ry = Relay
R4 = 25K D1,D2 = 1N914,1N4148,NTE519
R5 = 2K7 D3 = 1N4001

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