Construction and Working
In this web site, we tend to already reveal regarding Speed management of DC motor with timer IC, here this circuit made for the essential motive to satisfy the forward / Reverse operation of DC motor with speed management.
The DC motor is connected to the availability through DPDT ( double pole double through ) switch, by ever-changing, the switch position we are able to get forward and reverse rotation from the DC motor as a result of this switch interchanges power provide polarity applied to the DC motor.
The diode D1 protects the DC motor from the rear voltage impact thence there’s no output load impact rise. The NPN semiconductor unit bachelor’s degree 139 drives the output from timer IC, this output pulse length decides the speed of DC motor, by varied the VR1 resistance we are able to vary the heartbeat output of timer.