555 sound control delay lighting switch circuit

Published:2011/5/22 0:04:00 Author:TaoXi | Keyword: sound control, delay, lighting switch | From:SeekIC

As the figure 17-34 shows, the switch circuit is composed of the audio amplifier circuit, the rectifier circuit, the monostable trigger circuit and the relay control circuit.etc. This circuit can be used in wide range of applications such as the corridors and stairs. The audio signal which is collected by the pickup is also amplified by the VT1 and VT2, then it is rectified by the D1 and D2 to make the VT3 in the state of saturated conduction, also it makes the voltage of pin-2 less than 1/3VDD, the 555 sets, pin-3 has the high level voltage, the relay closes to turn on the power supply of the floodlight. When the sound is over, VT3 cuts off, C5 is charged through R5, when pin-6's trigger electrical level is more than 2/3VDD, the 555 resets, pin-3 has the low level voltage, J releases and the light turns off.



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