The dual-way control SCR liquid level control circuit

Published:2011/7/7 20:24:00 Author:Seven | Keyword: dual-way control, liquid level | From:SeekIC

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 conducting, the motor is running and drawing water. When the level is over a , Vp-a≈R3×VDD／（Rw1十R3）＞2／3VDD, so 555 is reset, 3-pin is in a low LEV, SCR is blocked and the motor stops.



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