Motor Driver Circuit Using Transistor

Stepper motor driver using bi polar transistors this stepper motor driver circuit uses the bd681 bi polar transistors for switching current to the coils.
Motor driver circuit using transistor. Also this motor driver dose not cost any more than 1 25 usd making it super cheap. 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. Using transistor single direction control. The same motor driver circuit is used in making a simple line follower robot.
Hello everyone in this instructable we will be using transistor as a motor driver. It is the simple and elegant solution to all motor driving problems. And add a diode to protect the electricity that may flow backward from the motor. The classic beginner s dc motor driver circuit that appears in every electronics textbook is the bipolar transistor h bridge.
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. If you want to rotate your motor in only one direction then this is the easiest way to do so. The driver circuit for a unipolar stepper motor can be constructed with the help of few transistors or a darlington transistor ic like uln2003. Transistor based dc motor driver circuit is one of the simple dc motor driver circuit.
So we need a h bridge of transistors in order to control speed as well as direction of the motor efficiently. But unable to control direction of the motor. The direction can be changed easily and the speed can be controlled. Hence we use h bridge ics like l293d to drive bipolar stepper motors.
An h bridge is an arrangement of transistors that allows a circuit full control over a standard electric dc 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. Let in be the input to the base of the transistor. 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.
We use the four transistors as a switch controller. But the driver circuit for a bipolar stepper motor requires an h bridge type connection. 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. It uses a power transistor d880 dc motor and a resistor for its operation.
To the collector of the transistor the dc motor is connected. Bridge transistor motor driver as figure 5 we use the four transistors to connected into the h bridge circuit. Because the single transistor motor driver was able to control the speed of motor.