Automatic Hand Drying Controller Circuit

Published:2011/4/1 4:01:00 Author:may | Keyword: Automatic, Hand Drying Controller | From:SeekIC

The operational principle of this circuit is shown in the diagram. Usually, the infrared rays emitted by the infrared emitting tube VD1 are exposed to the infrared receiver VD2, which leads the impedance of VD2 to decrease. At the same time, the fourth part of the LSE is outputing high electrical level, and the triode VT is at its deadline position. The electric relay J is in release condition with its normally open contact j 1-1 and j 1-2 disconnecting. The cold and warm air heating radiator can not work with no power supply. After people washing their hands, they will put their hands on the place between VD1 and VD2 where blocking out the infrared released from VD1, so the impedance of VD2 increases and the fourth part of LSE starts to output low electrical level, and the triode VT gets breakover, The electric relay J sucks close with its contacts power off. The cold and warm air heating radiator should be connected to power in advance and push the warm air button on the device.



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