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Date: Fri, 12 Feb 2016 16:47:48 -0500
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From: DJ Delorie <dj AT delorie DOT com>
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Subject: Re: [geda-user] Stepper Driver Question
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> The drive for that chip is out of the audio range.

The trace he posted says 10KHz, that's within *my* hearing range.  The
question is, is there something that's turning that into mechanical
noise?  Are there other variances in the PWM signal that might be
audible?