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Composed of trigger and switch tube motor automatic speed go

2016-09-02 17:21  
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Composed of trigger and switch tube motor automatic speed governor circuit diagram
Motor automatic speed governor circuit is composed of 555 trigger and a switch. The sample circuit is composed of R7 and motor in series. When the operation runs within the specified speed, sample voltage VA<1/3VDD, 555 resets, VT1 is conducted, motor runs with power; When the speed overrun, VA>1/3VDD, the connection of R1 makes 555 reset and VT1 stop, the motor power-off, inertial rotation. When VA<1/3VDD, it makes 555 resets again, VT1 will be conducted and the motor works. It controlls the speed of motor all day long. RP1 is used for adjusting the control trigger level.