The dual-way control SCR liquid level control circuit

See as the figure, the controller consists of liquid level, trigger controller and step-down rectifier circuit, etc. The water level detecting poles of a, b and c compose the bias circuit as the water level detector with W1, R1, R2 and R3. When the water level is below b, Vp-b?R3×VDD/?Rw1+R1+R2+R3?<1/3VDD, 555 is offset, SCR is triggered and conduct..

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