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Car headlight automatic controller circuit composed of 555

2017-01-16 08:59  
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Car headlight automatic controller circuit composed of 555
The diagram is car headlight automatic controller circuit. This controller consists of single-shot delay circuit ( IC1, Rl, R2、RD, C1), multivibrator ( IC2, R3, R4, C2) , intergrated circuit( 7812) , V-MOS power driving tubes BG2, BG3 to separately drive car's two headlight. The power source of this controller uses car's +24V storage battery, and it provides DC +12V voltage for IC1, IC2 afterregulation by IC3. When the front has no opposite cars, photoresistor RD presents high level becasue it does not receive shine, then the corresponding IC1 resets because pin 2 is in high level, then pin 3 outputs low level.It makes IC2 reset because pin 4 is low level, pin 2 outputs low level, then BG1 stops, BG2, BG3 isbreakover, two headlights arelighten.