Unipolar Stepper Motor Controller

Below are some images of a stepper motor controller I made for testing stepper motors. The body is a plastic inclosure I bought from a local electronics surplus store for a few bucks. The transistors are power darlingtons. Type TIP142, but this exact transistor is by no means essential in this project. I used them with the knowledge I would be working with some motors with high current loads. The motor this controller was intended, for the most part, had one ohm coils at a nominal 12 volts. Average of 4.5 amps, with no load, and at a moderate speed range. Lots of torque in that motor! I have made a zip file of the schematic and a pc board layout suitable for creating printed circuit boards. Both require down loading a share ware copy of the programs to view and print out copies. The links to these two fine programs are given below.

PCB Individual Assistant

Ivex International Inc.

Click on an image to enlarge...Back to return.

Click on links below to see individual files or down load the whole lot.

Schematic diagram GIF file version 1
Schematic diagram GIF file version 2
steppergif.zipFile contains text file and both GIF files.
PC board layout
stepper.zipFile contains PCB layout and original schematic's for drafting program.

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