Water power off and open controller

Published:2011/8/8 21:42:00 Author:Ecco | Keyword: Water controller, power off , power open | From:SeekIC

This water power off and open controller circuit described in the example is composed of the power supply circuit and control circuit, and it is shown in Figure 3-208. The power supply circuit consists of the step-down capacitor Cl, rectifier diodes VDl and VD2, current limiting resistor Rl, filter capacitor C2, Zener diode VS and other components. Control circuit consists of resistor R5, humidity sensitive resistor RS, thyristor Vn, Triac VTl. EH is the heater on the kettle. Rl chooses 2W metal film resistor; R2, R3, R5 select the 1/4W metal film resistors; R4 select the membrane variable resistor.



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