Automatic hand dryer circuit diagram

Published:2011/4/22 3:41:00 Author:Ecco | Keyword: Automatic, hand dryer | From:SeekIC

Infrared emission part generates a square wave signal with 50% duty cycle and 5kHz frequency by 555 circuit. And the signal drives the red launch tube to emit the infrared ray. When the hand placed under the dryers, as the hand has the reflecting effect to infrared ray, the PH302 in receiver circuit will receive the infrared signal change it into electrical signal, and it passes the selected frequency amplifier composed of IC1, IC2, IC3, the output signal being a DC signal and gets into the comparator IC4 by amplified, shaped, filtered. Comparator threshold voltage is 7V, setting high aims to improve the circuit's noise immunity. When IC4 input level exceeds 7V, the output goes low, the rocks make IC5 timer start timing, while 3 feet of the timer goes high to make 3DG130 turn, pull-point of relay pulls in to connect to resistance wire.



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