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Simple light-operated street lamp circuit diagram(4)

2016-08-10 15:25  
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Simple light-operated  street lamp circuit diagram(4)
The chart shows the simple light-operated street lamp circuit which is made by two-way thyristor, and it also uses two-wire connection, so installation is relatively simple. During the day, photo-resistor RL the low resistance due to exposure of natural light. The circuit has a soft-start process, which can help to extend the lamp life. Increasing or decreasing the value of R1 can change the sensitivity of light control circuit, but generally it does not have to adjust. VDH can use the bi-directional trigger diode with the turning voltage in 20 ~ 40V, such as 2CTS, DB3 types.