The control switch circuit with the cd4017

Published:2011/7/25 2:26:00 Author:Christina | Keyword: control switch | From:SeekIC

The output port q2 of cd4017 is connected with the clear port cr, so the q0 and q1 outputs the high level alternately under the function of the cp port input pulse. When the power is connected, the pin-15's differential circuits r2 and c1 clear the circuit, the q0 port outputs the high level, the q1 port outputs the low level, the transistor vt cuts off, the relay k will not operate, the light h which is controlled by k will not turns on. If you press the button sb which is connected with cp in parallel, the cp port will output a positive pulse, the q0 port outputs the low level, q1 outputs the high level, the vt conducts, the relay k gets power to close, the normally open contact point closes, the light h turns on.



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