This is a DC motor control circuit built using the concept of the H-bridge based on the transistor TIP31. Both switches S1 and S2 are normally open, and when pushed to close, the push button switch is pressed. The function of the LED is to indicate the direction of rotation of the motor. You can use any common type of LED. The TIP31 transistor is capable of handling currents up to 3A, and you can change the transistor DC motor to have higher current consumption. Remember to draw more current loads to run.
In fact, this circuit is built-in to drive a small DC motor that can be used in small applications such as auto-shutdown and open systems, mobile robot actuators, small fans, etc. Four diodes around the DC motor's back EMF diode. The type of diode depends on the current consumption in the DC motor. For a 12V motor pulled 1A load, use a 1N4001 diode. 3A DC motor, then use IN5401.
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