Bidirectional DC Motor Speed Controller

This kit allows controlling the speed of a DC motor in
both the forward and reverse direction. The range of
control is from fully OFF to fully ON in both directions.
Normally, switches are used to change the direction of
rotation of a DC motor. Change the polarity of the applied
voltage and the motor spins the other way! However this
has the disadvantage that a DPDT switch has to be added
to change the polarity of the applied voltage. Now you
have two things to control the motor - a direction switch
as well as the speed control.
Also, it is not a good idea to suddenly reverse the voltage
on a DC motor while it is spinning. It can cause a current
surge that can burn out the speed controller. Not to
mention any mechanical stress it can cause as well.
This kit overcomes both these problems. The direction and
speed is controlled using a single potentiometer. Turning
the pot in one direction causes the motor to start spinning.
Turning the pot in the other direction causes the motor to
spin in the opposite direction. The center position on the
pot is OFF, forcing the motor to slow and stop before
changing direction.
Max 30V DC, 3A