DC Motor Reverse Controller Circuit

Components:

R1,R6 = 1K
R3,R2,R4 = 100K
R5 = 10K
R7 = 220K
R8,R9,R10,R11 = 18K
C1 = 1µF
Q1,Q2 = BC337
Q3,Q4,Q5,Q6 = MJE800

In this circuit, an alternate on/off circuit is used to control switching of the bridge network of transistors(T3 - T6). DC motor in this circuit changes its direction of rotation each time the momentary switch SW is pressed

The working operation is simple, click here for the operation of alternate on/off circuit that controls the bridge network that drives the motor.

At the instance of power-up, T4 and T5 are forward biased so that current flow through T4 to the motor, then through T5 to the ground. When the switch, SW is pressed, reverse is the case. The base potential of T4 and T5 equals to zero while T3 and T6 are forward biased. Current flows through T3 to the motor and through T6 to the ground. This way, the motor will rotate in both directions; each time SW is pressed, the direction is reversed.