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Eye-care Lamps (the 5th)

2016-08-11 06:28  
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Eye-care Lamps (the 5th)
Work of the circuit The circuit consists of power circuit, timing control circuit, LED indicating circuit, light changing circuit, light examine circuit and acousto-optic alarm circuit (It is showed in picture 9-72.). Turn on the switch S and timing control circuit is supplied with +12V working voltage. And the voltage separates into two parts. One lightens the EL in the meantime the other one supplies 9V voltage to light examine circuit and acousto-optic alarm circuit. Change the value of RP1 to change the sensitivity of light examining circuit. And change the value of RP2 to change the regular timer.