The "BEAM Stepper" drive circuit

Posted on Jan 21, 2013

The 74AC240 stepper driver works by alternately enabling each half of the buffer. Only one half can be enabled at a time. Let`s assume that the top half of the driver is enabled. U1A & U1B along with R8, C1, and the input protection resistor R7 form a square wave oscillator. The outputs of U1A & U1B directly drive one coil of a bipolar stepper motor.

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The "BEAM Stepper" drive circuit A Duane C Johnson / Wilf Rigter joint effort Duane Johnson and Wilf Rigter came up with this interesting 74AC240-based circuit to drive small bipolar stepper motors (e.g., the ones in floppy drives): The 7

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