The Trinamic TMC2100 was a silent stepper motor driver when running a motor at medium ... you should probably look at this new chip as an upgrade to the A4988, with much higher microstepping ...
The testing-contraption to the left is a NEMA 17 stepper motor attached to an encoder ... lets it look like a low-current driver, inferior to the common A4988 and DRV8825.
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