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| | | Stepper Motor Driver (74194) | |
Probably the simplest, reversible drive circuit is the H-Bridge. Some BEAMbots use H-bridge motor drivers; many more use an H-bridge variant of some sort. Here's a simple conceptual schematic: Image Based on the SN74LS194 - Bidirectional Universal Shift Register the circuit is designed to drive UNIPOLAR type stepper motors and provides only basic control functions - Forward, Reverse, Stop and Speed adjustment. The only step angle for this driver is the design step angle for the motor. The circuit is not complex and is cheaper than many dedicated driver/controller devices and the parts are easy to find. | | |
