555 automatic radio controller circuit

Published:2011/6/14 4:05:00 Author:TaoXi | Keyword: automatic, radio controller | From:SeekIC

As the figure 14-5 shows, this controller can be used to control the electronic valve audio power amplifier. When the clock control system connected to the trigger switch S, J1 closes, the power turns on. The boot delay circuit is composed of the IC2 and R2, C3, the delay time td1=1.1R2C3, it is about 2-5 minutes, then the J2 closes to connect the high voltage. The ten minutes delay circuit is composed of the IC2 and C8, R5, if there is no monitor signal in ten minutes, the pin-3 will output the high electrical level to supply power to the IC3, and IC3 outputs the high electrical level to close J3, the high voltage turns off. The monostable delay circuit is composed of the IC3 and C9, RP3, R8, the delay time td2=1.1(R8+RP3)C9, it is about 10 seconds.



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