The single key touch switch circuit

Published:2011/7/3 20:30:00 Author:Borg | Keyword: single key, touch switch | From:SeekIC

Here is to introduce a single key touch switch circuit composed of CD4017, this circuit is controlled by single touch on the pole, every time it is touched, the switch will take action(ON/OFF) once, whose functions are the same with ordinary switch, and it is convenient to use.The working principle is shown in the figure, of which HD is the neon bulb of tube type, it consists of the self-made photoelectric coupler with resistor RG, and it forms the touching signal input circuit with the touch poles of M and R1. The odd input terminals Q1, Q3,Q5, Q7 and 9Q, etc, of CD4017 are connected with diodes of V2~V6, respectively.



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