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Sound control delay desk lamp circuit

2016-08-14 19:42  
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Sound control delay desk lamp circuit
The telephone desk lamp is as shown in the figure, when the telephone rings or off-hook at night, the light will turns on automaticly, after you hang up the telephone, the light will turn off in 45 seconds. In peacetime this telephone desk lamp can be used as the general dimming desk lamp, and it does not need the light switch. When this telephone desk lamp is used as the delay lamp, you just need to touch the delay button, this lamp will turns off in after 45 seconds. This circuit has multi-purpose, and it is composed of the optocoupler circuit, the light control circuit, the negative pulse generating circuit, the monostable trigger circuit, the thyristor switching circuit and the power supply circuit.