The sound control relay circuit

Published:2011/7/23 22:16:00 Author:Seven | Keyword: sound control relay | From:SeekIC

See as the figure, the circuit consists of the sound detection circuit and single steady trigger circuit, the relay is the executing component. VT1 finish the magnifying job of the input audio signal, when signals come, the 555 is reset, K is pulling in, VT2 is conducting, the electricity on C2 is released by the discharging tube and VT2 in 555. After the sound is gone, both VT1 and VT2 are blocked, C2 charges them through R2 and RP2, the contemporary stable time of the single stable circuit is td =1.1(R2+RP2)C2, the delaying time is 0.05~0.5S which can be adjusted by RP2.



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