Stepper motor controller - Driver circuit with circuit design

  
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Here is the circuit diagram of a simple stepper motor controller using only elementary parts. The driver circuit uses, four transistor (SL100) to drive the motor windings, two NOT gates and one XOR gate to decode the two bit control logic to drive the four windings of the motor. The diodes D1 to D4 protects the corresponding transistors from trans
Stepper motor controller - Driver circuit with circuit design - schematic

ients generated during the switching of motor windings. d0 and d1 are the control logics which determines the direction of rotation as well as speed. The control logic for the circuit can be obtained from a 2 bit up/down counter clocked by a 555 astable multivibrator. The direction of count determines the direction of rotation and the frequency of astable multivibrator determines the speed of rotation. Vcc is the voltage required for the stepper motor. It varies from motor to motor. Here we can use up to 24V stepper motors. For higher operating voltages and power the SL100 transistors must be replaced with higher power transistors like 2N3055.



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