It is a typical H-bridge DC motor control circuit, the circuit because it resembles the shape of the letter H, and so named "H-bridge." 4 triode four vertical legs of the H, and H is the motor of bars.
Two conduction control transistor controls the current direction to achieve Story inversion control motor. FIG current is black. Instead, the control current flows from the other two transistors.
Turn left | right turn
H called double bridge because L298N which integrates two such circuits,
Wherein the transistor circuit can be replaced with FET. It is to use two transistors on and off states of the motor is connected to!
