Long-time turnoff delay circuit

Published:2011/11/10 1:24:00 Author:May | Keyword: Long-time, turnoff delay | From:SeekIC

The timer 555, optoisolator 1300 and bridge trigger three-terminal bidirectional thyristor switch is combined in the circuit, after control switch ispressed with short time,it will makeAC motor or other devicebreakover with 1h. After switch isclosed, timer 2 's voltage drops to under 1/3Vcc tomake timer output rise, thereby LED isbreakover. At the same time, 7 capacitor starts charging, befor it is charged to 2/3Vcc, the output is still in high level; when output recovers to low level, the motor turns off.



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