stepper motor controller circuit

Posted on Feb 5, 2014

The circuit shown above can be used to control a unipolar stepper motor which has FOUR coils (I`ve swiped it off an old fax machine). The above circuit can be for a motor current of up to about 500mA per winding with suitable heat sinks for the SL100. For higher currents power transistors like 2N3055 can be used as darlington pair along with SL100

stepper motor controller circuit
Click here to download the full size of the above Circuit.

. The diodes are used to protect the transistor from transients.

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