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Liquid level controller circuit diagram 1

2014-11-20 14:10  
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Liquid level controller circuit diagram 1
The liquid level controller circuit consists of the power supply circuit and level detection control circuit, and it is shown as the chart. Power supply circuit consists of the power switch S1, power transformer T, bridge rectifiers UR1, UR2 and filter capacitors C1, C2. Liquid level detection control circuit is composed of the test electrodes a ~ c, control buttons S2, S3, resistors R1 ~ M, transistors V1, V2, LEDs VL1, VL2, relay K, and AC contactor KM, diode VD. R1 ~ R4 select the 1/4W metal film resistors or carbon film resistors.