DRV8825 (just like Pololu ones) stepper driver, plugged into RAMPS 1.4 board drive 1.7A 4-wire stepper, both with or without microstepping. At all times, stationary or moving the stepper produces considerable hissing resembling that of an amplified computer sound card background noise. Hissing cha…

Stepper hisses even standing still. Can current on all coils be normal?

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