# H-bridge motor driver circuit using transistors

Make dc motor driver with H-bridge circuit of transistor. The circuit of the H-bridge transistor is a series of several transistors arranged in such a way that it can be used to drive the motor in two directions. In this article admin will discuss about H-bridge h bridge circuit using transistors

With a H-bridge the motor rotation transistor can be adjusted clockwise or anticlockwise (forward or backward)

The command used to control the rotation can be by using logic 1 and 0 or it could be with PWM signal

To make dc motor driver with H-bridge circuit the required component transistor is very simple with only 4 transistors, 4 diodes, and 4 resistors

## Make dc motor driver with H-bridge circuit using transistor

H-bridge transistor circuit can be made by using 4 transistors of type NPN or similar PNP

If the transistor used is npn type then logic 1 is needed on the base to turn it on and if using PNP type to turn on the motor is required logic 0

You can read in article how high and low logic works

For NPN transistor you can use transistor TIP 31, TIP 41, 2N3055

For PNP transistor you can use transistor TIP 32, TIP 42, MJ2955

Noteworthy is the two inputs on the h-bridge circuit of the transistor should not be active simultaneously because the electric current will result. Flows directly from Vcc to gnd

To avoid damage to the transistor due to heat make sure you install the cooler

The function of the diode is to protect the transistor against the induction load

Here’s a series of h-bridge motor driver circuit that you can make

## How the H-bridge motor driver circuit works

how the h-bridge transistor is when input A gets a voltage or logic 0 and input B gets logic 0 then transistor T1 and T4 will be active so that electric current will flow from Vcc -> T1-> C-> D-> T4-> gnd

Looking the picture

When input A gets logic 1 and Input B gets logic 0 then electric current will flow from Vcc -> T2-> D-> C-> T3-> gnd and motor will rotate opposite

To set the speed of your motor can use pwm signal

All you need to know is that both inputs A and B should not have logic 1 at the same time

## H-bridge circuit with transistor protection system

To outsmart the two inputs are not lit simultaneously then the admin will provide tips that is by adding a series of and gates and xor gate on the input as in the picture

With a series of H-bridge transistors with a protection system then the two inputs will not be active simultaneously

read also article understanding and how to work and gates