Re: [LAU] Ground loop noise problem using MSI H-97 Gaming 3 motherboard, SeaSonic SSR‑360GP 360W power supply.

From: <karl@email-addr-hidden>
Date: Mon Mar 06 2017 - 14:29:16 EET

Ralf Mardorf:
...
> If we warn users to remove ground, we also should warn users to do any
> special wiring, let alone forbidden wiring.

. It is permitted to provide extra grounding, at least here in Sweden

. Don't ever remove safety ground (well there are exceptions for
  research and such, but there are certain conditions for that)

> Using the same multiple
> socket for computer and amp is a single point ground, period. If this
> shouldn't work, your wiring won't improve anything.

Yes, that's the usual advice regarding sensitive analogue equipment.
Though it requires that the users have some basic understanding of
cause and effect.

You can lower the effect of outside magnetic fields by making sure
that the area between your power and signal cable (assuming that they
are your only electric cunducting connections between your sound card
and the equipment) is as small as possible (but be aware that if they
are too close, the power cable will cause interference by itself).
That area swept by thoose two cables can be though of as a transformer
winding as an aid of understanding why this happens.

Another way to do grounding, this time from the EMC camp, is to ground
everything to everything as much as possible, though they have a
different goal than high fidelity.

If you have crappy equipment the disturbancies can creep in there in
first place and whatever cabling you use isn't the cause.

Regards,
/Karl Hammar

-----------------------------------------------------------------------
Aspö Data
Lilla Aspö 148
S-742 94 Östhammar
Sweden
+46 173 140 57

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Received on Mon Mar 6 16:15:02 2017

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