Light-Operated Night Lamp (3)

Published:2011/5/27 6:39:00 Author:Sue | Keyword: Light-Operated, Night Lamp | From:SeekIC

The 220V voltage will provide LED circuit with working voltage after reduction, rectification. Another circuit will provide light-operated electronic switch circuit with 15V ac voltage after reduction, rectification, filtration and stablization. In the daytime, RG's resistance value is small because of the light. VS2 is connected and V is connected. VT is disconnected and VL1-VL8 are not illuminated. At night, RG's resistance value becomes large. C5's voltage becomes lower. VS2 and V are disconnected. R8,R9 will provide VT with voltage. VT is connected and VL1-VL8 are illuminated.



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