As shown, the circuit is a buck rectifier circuit. Trigger, relay control part. 555 and R1, R2 and three probes form an RS trigger. When the farm water level is lower than the electrode B point, the 2 feet are grounded through R1, which is low level, 555 is set, 3 feet are high level, relay J Pulling in, motor M is energized, running pumping.
Electroluminescent Lighting Membrane Switch
EL backlight membrane switch is a kind of fashion appearance, on the power supply will produce all kinds of light source around the switch of the film switch, and it is different from the general LED light film switch, EL backlight membrane switch compared to the LED light film switch luminous brightness and luminous color are better. The reason why EL backlight membrane switch has such a good effect and EL light chip is inseparable, understand the principle of EL light chip, in order to make a good light with EL backlight membrane switch from the principle.
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