Pwm H Bridge Circuit. And the pot r1 varies width of output pulse applied to h bridge circuit. So the spdt switch alters the direction of motor.
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As we change the position of spdt switch the signal is either applied to q1 and q4 or q2 and q3. The h bridge driver mosfets are driven by a high frequency pwm signal. Here s the concept of the h bridge.
This configuration is so named because it resembles the letter h and allows the effective voltage across the load to be doubled since the power supply can be switched across both sides of the load.
And the pot r1 varies width of output pulse applied to h bridge circuit. So the spdt switch alters the direction of motor. This circuit drives a motor clockwise anticlockwise via a pot and reduces the speed to zero when the pot is in mid position. You normally use it with a microcontroller such as an arduino to control motors.
