Motor Driver Circuit Using Transistor

We use the four transistors as a switch controller.

Motor driver circuit using transistor.

The same motor driver circuit is used in making a simple line follower robot. Its circuit is shown below. An h bridge is an arrangement of transistors that allows a circuit full control over a standard electric dc motor. It uses a power transistor d880 dc motor and a resistor for its operation.

Transistor based dc motor driver circuit is one of the simple dc motor driver circuit. But the driver circuit for a bipolar stepper motor requires an h bridge type connection. If you want to rotate your motor in only one direction then this is the easiest way to do so. Actually we can t say it as a motor driver as it can just toggle motor on or off rather than controlling the motor speed or direction.

The direction can be changed easily and the speed can be controlled. Here power transistor is used as a switch to turn a motor on or off depending upon the applied voltage at base. Also this motor driver dose not cost any more than 1 25 usd making it super cheap. Because the single transistor motor driver was able to control the speed of motor.

The h bridge motor driver circuit this circuit is called h bridge because the mosfets form the two vertical strokes and the motor forms the horizontal stroke of the alphabet h. The classic beginner s dc motor driver circuit that appears in every electronics textbook is the bipolar transistor h bridge. The name h bridge refers to the look of the connection consisting of four transistors and a motor in the center forming the letter h. An h bridge is a simple electronic circuit consisting of four switching elements like transistors bjt or mosfet that can drive a motor in both the directions without switching the leads.

Let in be the input to the base of the transistor. Hence we use h bridge ics like l293d to drive bipolar stepper motors. But using the transistor protects our arduino from burning out. And add a diode to protect the electricity that may flow backward from the motor.

Hello everyone in this instructable we will be using transistor as a motor driver. But unable to control direction of the motor. Bridge transistor motor driver as figure 5 we use the four transistors to connected into the h bridge circuit. The driver circuit for a unipolar stepper motor can be constructed with the help of few transistors or a darlington transistor ic like uln2003.

The bd6xx range is an npn darlington with a collector current rating of 4 amperes and there is a wide range of transistors available for use in this application. It is the simple and elegant solution to all motor driving problems. Using transistor single direction control.