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Light-Operated Night Lamp (2)

2016-08-02 13:36  
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Light-Operated Night Lamp (2)
The power circuit consists of C1,R1,VS,VD,C2,S and GB. The light-operated circuit consists of R2,RG,V1 and V2. The alternating current voltage of 220V can provide EL and the circuit with 12V voltage after reduction, stablization, rectification and filtration. It can also charge GB by S. In the daytime, RG will have a small resistance value because of the light, and V1,V2 are disconnected. EL is not illuminated. At night, RG has a large resistance value. Its voltage is higher than 1.4V and V1 V2 are connected. EL is illuminated.