Touch Bathroom Exhaust Fan Time Delay Switch Circuit Composed of CD4069

Published:2011/7/27 5:40:00 Author:Sue | Keyword: Touch, Bathroom Exhaust Fan, Time Delay Switch | From:SeekIC

In the picture, the touch exhaust fan time delay switch consists of only one CD4069 and thyristor. It has simple structure and low production cost, and is affordable. The circuit is shown in the picture. The circuit structure is very simple. It connects CD4069's four phase inverters in series and time delay circuit R,C are added into it. The input terminal is connected to touch film M through high-value resistor R1,R2, and D4's output terminal is connected to the thyristor's trigger terminal.



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