Soekris boards use at least one DC to DC transformer. These are notorious for
creating whine, even when they are spec’d in such a way that audible whine
would seem impossible. they also react differently under load. The only one I
can find listed is for the pci slot, so you may want to try adding load to that
(insert a card) and see if that changes or eliminates the whine.
Otherwise, you’re in sound dampening territory. High pitch whines are easy to
squelch if you can locate them. I can’t hear anything from my boards, so I
can’t help you in a more practical a manner.
ED.
> On 2016, Jan 21, at 12:05 PM, Muffinman <[email protected]> wrote:
>
> Hello,
>
> My NET6501 runs quite well except for a very annoying high-pitched tone
> originating from the board (sometimes). Since I intend to use this
> computer in my hifi setup, well, it's a bit problematic.
>
> I've got an external 12v power supply some distance away from the board,
> so that isn't creating the noise. In addition, I've tried two different
> 12v power supplies, both with the same effect. I don't see a relation
> with CPU load (though the processor has an easy job anyways), or any
> relation at all. Sometimes the tone is there, gets more intense, and
> then it's gone to a low level (or perhaps gone).
>
> Has anyone got experience with this (annoying) feature. Also important:
> does anyone have a (possible) solution?
>
> Kind regards, Maarten
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