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Driving a Stepper Motor with Power MOSFETs (MEC158E)

This circuit was adapted from my book Robotics, Mechatronics and Artificial Intelligence (sold out) published in the United States. It can be used as a control shield for stepper motors in a mechatronics or robotics project or as a building block for simple projects. Power MOSFETs can be used to drive stepper motors as shown by the shield in Figure1. The high-impedance input characteristic of power MOSFETs makes them ideal for this purpose.

 Power MOSFETs can drive motors with currents of many amperes, depending on the type. This circuit can be driven from TTL and CMOS logic and other blocks.


Figure 1    Shield using power MOSFETs
Figure 1 Shield using power MOSFETs