On Sun, 10 Jun 2012 17:27:08 -0700, JSL Internet <inter...@jsl.com> wrote:
> Jan,
>
> It is more likely that the noise you are hearing is coming from the
> magnetics rather than from any capacitors. There are planar
> transformers in the switching power supply and the Ethernet interface.
> Sometimes the transformer core material has a natural frequency
> harmonic in the audio band. You could try potting the transformers to
> reduce or eliminate the noise.
>
This makes sense. Next time it happens, please listen to see if the
noise is coming from the power supply or the machine, if the machine
could you perhaps run it with the case open and determine which
component is the source?
Cheers,
Jonathan
--
jjg: Jonathan J. Groll : groll co za
has_one { :blog => "http://bloggroll.com"; }
"Men always want to be a woman's first love. Women have a more subtle
instinct: What they like is to be a man's last romance." ~ Oscar Wilde
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