Light-Operated Streetlight (5)

Published:2011/7/8 6:00:00 Author:Sue | Keyword: Light-Operated, Streetlight | From:SeekIC

The light-operated circuit consists of light-operated transistor V, diodes VD1,VD2, capacitor C2-C4, field effect transistor VF, potentiometer RP, resistor R2-R4 and relay K. In the daytime, V has a low resistance value because of the light and V is disconnected. VF is connected. K is connected. The working power is cut off by its normally closed contactor and the streetlight is not illuminated. In the evening, V has a high resistance value and VF is disconnected. K is released. The working power is connected by its normally closed contactor, then the streetlight will be illuminated. By adjusting RP's resistance value, the light-operated sensitivity can be changed.



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