Light-Operated Neon Light (1)

Published:2011/7/3 2:55:00 Author:Sue | Keyword: Light-Operated, Neon, Light | From:SeekIC

The 220v voltage will provide C4 with +12v working voltage after reduction, rectification, filtration and stablization. In the daytime, V1 has a high resistance value because of the light, V2 is disconnected. IC2's inner switch is disconnected. IC3 and IC4 will have no working voltage. VT1-VT4 are disconnected. HL1-HL4 are not illuminated. When it is dark, V1 has a low resistance value because of lack of light. V2 is connected. IC2's pin 5 has a high level. Its inner switch will be connected. Pin2 and pin 3 will output +12v voltage. IC3 and IC4 will begin to work.



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