Automatic switch train lighting design

Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle

100V, 250mA, surface mount, high speed switching diode

As shown, the circuit consists of a photosensitive device (photosensitive resistor RG), R1, RP1, C1, and 555. RG is placed where it can be illuminated. When exposed to light during the day, RG exhibits a small resistance value (<10kΩ). IC's 6-pin is high-powered (>2/3 Vdd), 555 reset, J-suck, J1-l, Jl-2 are disconnected, the light is not bright, at night, RG resistance is very large, or open circuit, 2 feet are low level (<1/3 Vdd), 555 quantity, J release, J1-1 J1-2 is in a normally closed state and the light is on. LED3 is used as a step-down, and LED1 and LED2 are used for duty supervision.