Re: NET6501: high pitched tone from the board

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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