Motor driver circuit using MOSFET

This is a DC motor driver circuit using a single N channel MOSFET. In this circuit the DC motor keep on running in one direction until when the switch is pressed it reverses its direction. This circuit can be used as a Motor driver in different projects. In fact it takes only very few components and can be built pretty easily. If you are looking for motor driver circuit to be used with Microcontroller or Development boards consider this Bidirectional motor control circuit for ease of use and have more control over the motor movements.

COMPONENTS REQUIRED:

  1. 2 x Resistor 10K Ohm
  2. 2 x MOSFET N Channel – FQN1N50C
  3. 12V DC Motor
  4. 12V DC Battery or 12V DC Adapter

WORKING OF MOTOR DRIVER:

First we have our source of energy a 12VDC Battery. A Switch Sw1 connects it directly to the Gate of both the MOSFET. Source pin of both the MOSFET’s are connected to ground or negative terminal of the battery. When both source are connected to ground or negative terminal of the battery we will have the output for our DC motor in Q1’s drain pin and Q2’s source.

Connecting a button between the battery and each of the gates of FET can be used to control the ON/OFF state of transistor. When the button is not pressed the transistor will be in open state and the Motor receives 12V from the drain of the FET Q1 on its positive pin. And 0V from Q2 to motor’s negative pin. But when we press the button we put the transistors in saturation state. So the motor now receive 0V from Q1 and 12V from Q2, therefore changing the direction  of motor’s rotation.

You can add motors in similar manner to control it altogether. To do this you should make sure your MOSFET is capable of handling the current intake of motors used here. Also in case if you are powering the circuit using a battery you should have in mind that the current intake of motor should be less than current draw capacity of the battery.

Leave your queries and feedback about this circuit in the below comments section. We will be happy to answer your questions 🙂


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