555 sound control color light circuit

Published:2011/5/21 22:41:00 Author:TaoXi | Keyword: sound control, color light | From:SeekIC

This sound control color light circuit can be used in wide range of applications such as the music room, the dance hall or the karaoke, the home decoration. This circuit is composed of the step-down rectifier circuit, the sound/electricity conversion and amplifying circuit, the monostable timing circuit and the SCR color light control circuit. The circuit is as shown in figure 17-60. The monostable trigger timing circuit is composed of the IC1(555) and R4，C4. When there is no signal, pin-2 of 555 has the high level voltage because of R2's lifting effect, so 555 is in the reset-state, pin-3 has the low level voltage, LED1 turns off, SCR cuts off; when there is the music or sound signal, this signal is amplified by VT1 and VT2, the negative pulse signal triggers 555, pin-3 outputs the high level voltage, LED1 turns on.



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