Yeah that's what i thought too, hence why i buy few different model.
Well, yes i hear some little noise which is more or less louder depending of the model... but there's always some noise when you play around the minimum low-voltage threshold.
I tried higher PWM frequencies and it may cure some part of the problem on some voltage range and on some motor model. but it's certainly not perfect on ALL motor i have here.
To me, in this specific case, a better choice could be to use some kind of linear regulation. Something around the following.
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