Well its quite common if you look it up on google. The whine is like a 1khz
with lots of harmonics on it. The system is a pretty normal pc with a quad
core processor solid state drive etc. I have a Behringer fairly cheap
phono input output device that seems to have been used by many as its
quality is good considering its price. You will find derivations o f it
avaialable everywhere. It obviously is the computer that is the issue as
using it on some other machines one cannot hear this sound. My guess from
reading is the earth voltage drop issue which in effect has put some
internal modulation on the analogue circuits. It does seem odd though that
they seem to affect the output side more than the input side.
There is a huge great earth terminal on the unit but trying various
connections to different gear makes very little difference.
Brian

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The Sofa of Brian Gaff...

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"Don Pearce" wrote in message
...
On Sun, 12 Feb 2017 20:50:07 -0000, "Brian Gaff"
wrote:

I was looking to find a simple answer to this issue, which seems to
afflict
any usb sound device I use to connect to an analogue source. I did try the
internal card also, but that suffers from swooshes and other weird noises
due to it being inside a busy computer one assumes.
In the majority of cases the while is constant, though can vary if other
things are going on in the machine.
it seems to only be on the output sockets, and the input both line level
seem pretty good. This does not seem logical to me, but I've been told in
the main its because of the earth return through the usb and the one
through
the mains are different impedances effectively modulating the supply. I
did
find a special psu that supposedly fixes this sort off thing with a
breaker
in the earth in the us be cable supplying isolated power only down the
line.
However most of these seem to be several times the cost of the interface.

I did wonder about a powered hub, but have been told this will not work.

Brian

I've never come across this problem. Can you give more detail about
your system?

d

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