Street light control circuit 9

It adopts 555 time base integrated circuit and has reliable operation. There is no flicker when the street light is turned on or off. During the day, the resistance
of     the photoresistor RG is small, pin 3 of A outputs low level, the thyristor V is closed, the relay KA is released, and the street light goes out. When it gets dark, the resistance of RG becomes larger, pin 3 of A outputs high level, V is turned on, KA is turned on, and the street lamp lights up.