Unipolar Stepper Motor Driver Circuit

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This page presents a circuit for driving high-power unipolar stepper motors. Here you will find all the information needed to make your own. This circuit allows step-level control and can be easily modified for other modes of operation.

What you need

Circuit Schematic and Photo

The L297 has several inputs that can be generated by a PC/104 stack or other controller. This circuit allows you to control each step, in full-step mode. Meaning: You can tell it to move one step in either direction (of course you can make it move fast and it will continuously rotate). The two inputs are a direction and a pulse. In the next section you will find a program to control this using xPC.

Here is the CircuitMaker file: Unipolar Stepper Driver Circuit

Unipolar motor driver.jpg Unipolar motor circuit photo.jpg

You may find the following diagrams useful when constructing this circuit:

L297 pinout.jpg NPN pinout.png Stepper wire colors.png
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