Light-Operated Streetlight (9)

Published:2011/7/1 5:57:00 Author:Sue | Keyword: Light-Operated, Streetlight | From:SeekIC

The 220v voltage will provide IC with 8.5v working voltage after reduction, stablization, rectification and filtration. In the daytime, RG has a low resistance value because of the light. IC's pin2's and pin 6's voltages are larger than 2Vcc/3, and IC's pin 3 outputs low level. VL is not illuminated. VT is disconnected and EL is not illuminated. When it is dark, RG has a larger resistance value and IC's pin2's and pin 6's voltages are becoming smaller. When the voltage is higher than 2Vcc/3, IC's inner trigger will be reversed. Its pin 3 will have a high level which will make VL illuminated. VT is illuminated and EL is illuminated. When the next day comes, RG has a smaller resistance value. IC's pin 2's and pin 6's voltage are becoming larger. When the voltage is lower than Vcc/3, IC's pin 3 has a low level. VL and VT are disconnected. EL is not illuminated.



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