555 thermos touch automatic drain circuit

Published:2011/6/1 1:51:00 Author:TaoXi | Keyword: 555, thermos, touch, automatic drain | From:SeekIC

As the figure 15-3 shows, this circuit uses the 555 as the core to form the monostable trigger device. When the hand touchs the sequin M, the thermos will drain automaticly. The monostable timing circuit is composed of the 555 and RP1，C1, the timing time td=1.1RP1C1, by adjusting RP1, you can change the drain time, the longest drain time is 10s. You should adjust it before using. The VT1 can be used to drive the electromagnetic valve DF's amplifier, the VT1 will conduct in the timing time, so the coil of the electromagnetic valve gets power, the valve rod moves down under the effect of the magnetic force to increase the horizontal pressure, then the hot water gets out from the water outlet.



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