Light-Operated Streetlight (2)

Published:2011/7/8 5:51:00 Author:Sue | Keyword: Light-Operated Streetlight | From:SeekIC

The 220V ac voltage will provide the light-operated circuit with +12V working power after it is reduced by T, rectificated by VD1-VD4, filtrated by C. In the daytime, RG will have a low resistance value because of the light, which will make IC's pin2 and pin 4(output terminal) output high level. Its inner electronic switch is disconnected and K is disconnected. The illumination EL is not illuminated. In the evening, RG will have a high resistance value because of lack of light, which will make IC's pin 2 output low level. Its inner electronic switch is connected and EL is illuminated. By adjusting RP's resistance value, the light-operated sensitivity will be changed.



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