Stepper motor control

The control is a compact design for driving bipolar stepper motors. Driver stages IC2 and IC3 are modern types from ST Microelectronics. Because of the combination of CMOS logic with D-MOS power transistors, these devices need few external components. Also, compared with the previous generation of bipolar devices such as the L298, the D-MOS transistors drop lower voltages so that the internal dissipation is smaller.