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-ampR2 = 100K        C4,Cx = 10uF, electrolytic       MIC = Electret Mike, 2-wireR3 = 100K           Ry = RelayR4 = 25K         D1,D2 = 1N914,1N4148,NTE519R5 = 2K7            D3 = 1N4001

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