555 sound control turn-off delay switch circuit

Published:2011/5/22 2:47:00 Author:TaoXi | Keyword: sound control, turn-off, delay switch | From:SeekIC

The capacitance step-down rectifier circuit supplies the VDD=6V DC power supply voltage to the sound control circuit. IC1 uses the special sound control integrated circuit SK-1, and this integrated circuit has the bi-stable flip-flop and the 3-stage amplifier. In peacetime, the pin-9 of IC1 has the low electrical level, but when the pick-up B receives the sound signal of clap, the bi-stable of IC1 flips, pin-9 has the high level voltage, VT1 conducts. Because pin-2 of IC2(555)'s trigger level is less than 1/3VDD, so 555 sets, pin-3 has the high level voltage, the light turns on.



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