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555 sound control lighting electronic wall clock circuit

2017-01-07 05:37  
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555 sound control lighting electronic wall clock circuit
As the figure 15-33 shows, the circuit is composed of the voice sensor, the monostable trigger, the counter and the timing circuit.etc. The voice sensor uses the electret condenser microphone, when you clap three times, the sound will be amplified by VT1, then triggers the monostable timing circuit which is composed of the left part (1/2 56) of the IC1 and the R5, C4, the output pulse-width td=1.1R5C4, it is about 1.2s. The IC2 uses the octonary number system count/pulse dispenser, when you clap three times, the pin-3 of 555 will output three pulses to make the pin-1, pin-3, pin-7 of IC2 have the high electrical level one by one, the VT3 conducts, the low potential of the c electrode resets the IC1, the audio signal is sealed.