Light-Operated Streetlight (16)

Published:2011/7/1 6:38:00 Author:Sue | Keyword: Light-Operated, Streetlight | From:SeekIC

In the daytime, GB will be charged. RG will have a low resistance value which will make IC1's pin 2's and pin 6's voltages higher than 2Vcc/3. IC1's pin 3 will output low level. IC2 and V1 don't work. K is released and EL is not illuminated. When it is dark, RG has a larger resistance value which will make IC1's pin 2's and pin 6's voltage become lower. When the voltage is lower than Vcc/3, IC1's inner circuit will be reversed. Its pin 3 will have high level. IC2 and V1 will begin to work. Then pin 3 will output low level which will makes V1 connected. K is connected. Then ELA will be illuminated.



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