Doepfer

What happens if you disconnect the shield from DI to mixer?

If this reduces the noise, you should get a soldering iron and change
the signal earth with chassis earth from mixer.

If it does not reduce noise its not a groundloop problem.

Hope it helps.


--- In Doepfer_a100@yahoogroups.com, "stuadh" <stuadh@...> wrote:
>
> Hi all,
> 
>   thanks for your answers.  I got the DI Box, one recommended on the
> SOS Website (ART Cleanbox II) and not the cheapest one around.  Not
> one bit of difference.  I connected up the earths of all the cables
> again (and again no difference.  This is definitely a 
> Mixer-Analogue Synth problem as removing any connection between the to
> makes the problem disappear.  By the way, this isn't a small problem -
> it's really loud!
> 
> Can anyone offer the next step as the synth is currently unusable?
> 
> Your in desperation
> 
> Stuadh
> 
> --- In Doepfer_a100@yahoogroups.com, "Carlos" <bushwick@> wrote:
> >
> > 
> > if you are in the US try one of those cheap plug adapters from 3 ends
> > to two  on your computer's power cable plug, (so the 3rd circular ends
> > up removed from the equation) this solved a problem I had before with
> > my laptop causing ground noise. but might be more of a temporary
> > solution. I just don't use the laptop anymore :)      
> > 
> > 
> > Carlos.
> > 
> > --- In Doepfer_a100@yahoogroups.com, "Anwander, Florian"
> > <Florian.Anwander@> wrote:
> > >
> > > Hi
> > > 
> > > we had similar problems last week within a large live setup.
> Around 15 
> > > musicians with computers, lots of synths and softsynth, all
mixed to 
> > > submixers, which are led to a main mix. The lenght of the power and 
> > > audio cables are 6 meters for the most musicians at least.
> > > 
> > > Though this sounds like a bunch of humm traps the most
> participians do 
> > > not have real problems, but two guys:
> > > Finally we could track down that these two are using
> > USB-Audiointerfaces 
> > > where the interfaces are powered by the USB port, not by an
external 
> > > supply. This means that you have the dirty ground of the digital
> domain 
> > > as audioground.
> > > 
> > > Our solution now was simply to forbid this type of audiointerfaces.
> > > 
> > > Florian
> > > 
> > > stuadh wrote:
> > > 
> > > > Hi,
> > > > 
> > > >   I would like to appeal to anyone with experience in
eradicating a
> > > > probable ground loop.  I've just done a bit of upgrading in my
> studio,
> > > > and I've developed a nasty buzzing in my system.  I've narrowed it
> > > > down to the interplay between Logic 7 and my analogue synth.  Of
> note
> > > > is that I have not changed anything inside the synth since
> before the
> > > > upgrade and that the problem exists even when the synth is
> turned off
> > > > but not when it is unplugged from the wall.  In fact, I've
just been
> > > > jiggling about with the plug and the buzz come back as soon as the
> > > > earth pin of the plug makes contact.
> > > > 
> > > >   The problem also only exists when Logic is running but not
when i
> > > > run things like iTunes etc.  It can also be controlled by the
mixer;
> > > > turning down the channel volume or EQing it out work.  I've also
> gone
> > > > around turning off and unplugging everything except the computer,
> > > > synth and mixer, but the buzz remains.
> > > > 
> > > > Can anyone help?
> > > > 
> > > > Yours Aye
> > > > 
> > > > Stuadh
> > > > 
> > > > 
> > > > 
> > > >  
> > > > Yahoo! Groups Links
> > > > 
> > > > 
> > > > 
> > > > 
> > > 
> > > -- 
> > > Florian Anwander                  |ConSol
> > > Tel.   +49(89)45841-133           |Consulting&Solutions Software
GmbH
> > > Fax    +49(89)45841-111           |Franziskanerstr. 38, D-81669
> München
> > > email: florian.anwander@ |http://www.consol.de
> > >
> >
>