555 approach switch circuit

Published:2011/6/20 8:35:00 Author:TaoXi | Keyword: 555, approach, switch circuit | From:SeekIC

The approach switch circuit is the monostable trigger which is composed of the 555. The trigger port pin-2 of 555 is connected with the power supply voltage port through the high value resistance, it is in the standby state. When the human body approaches or touches the metal plate, the induction signal 555 is triggered to output a monostable pulse. The C2 can be used in the anti-disturbance filtering. This circuit can be used in the electrical equipments, the toys and the alarm circuits.



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