Approach Switch Circuit

Published:2011/7/21 1:41:00 Author:Joyce | Keyword: Approach, Switch | From:SeekIC

The switch forms a monostable trigger circuit with 555 as the core component .The trigger end feet 2 of is connected with VDD through the major resistance R2, waiting for trigger. When the human body gets close to or touches the metal plate electrode, 555 is activated to output a monostable pulse because of the induction signal. C2 is used to resist interference filter. This circuit can be used for electrical appliances, toys or alarm circuit.



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