The self-made fast hand drier circuit

Published:2011/6/30 3:43:00 Author:Seven | Keyword: fast hand drier | From:SeekIC

45. The self-made fast hand drier circuitThe drier will blow out warm air if the washed hand is below it, and when the hand becomes dry, it will stop automatically, see as figure 2. When there is light, the 1-pin of the IC is in a low LEV, TWH8751 is blocked, J is power-off, J1-1 is broken down. When the hand is blocking the light, D2 is in a high resistance, the 2-pin of IC is in a low LEV, so the output terminal of IC is conducting, J1-1 is passable, the heating wire and motor get power, so the warm air is blown out. The power supply of the control wire is stepped down and rectified by the 36K resistor and 2CP12, then the voltage of 18V or so is acquired.



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