Light-Operated Streetlight (12)

Published:2011/7/1 6:14:00 Author:Sue | Keyword: Light-Operated, Streetlight | From:SeekIC

The 220v voltage will generate +12v voltage after reduction and stablization. The voltage will be put on IC. The other circuit will provide IC's pin 5 with voltage. In the daytime, RG will have a low resistance value which will make IC's pin 5 have a low level. IC's inner switch will be disconnected. Its pin 2 and pin 3 will output low level and VT is disconnected. EL is not illuminated. When it is dark, RG will have a high resistance value which will make IC's pin 5 have a high level. IC's inner switch will be connected. Its pin 2 and pin 3 will output high level. VT is connected and EL is illuminated.



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