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Low Mains hum

Hi there  I have a problem with my A/D converter. I am running this through a DIGI 003 and there seems to be no problem with the system linking up they both talk to each other fine the signal goes through the system from all of the inputs. However the problem I seem to be having is there is a low hum which sounds like mains hum I have had a look inside and the unit seems to be earthed ok. The mains hum seems to dip a little when turning on the phantom power and sometimes just  dips on it's own. I thought it might be a dry break on the circuit board but I would rather leave it as a last resort to remove it as it is a lot of hassle. Would you have any idea as to what else it might be. As everything is working fine i'm totally stuck.

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Definitely sounds like a ground issue, try plugging it into an outlet on a seperate house circuit, or you could always live on the edge and clip the ground on the plug via an adapter plug.

Posted on Aug 06, 2008

  • Brandon Belletieri Aug 06, 2008

    A wall outlet on a different house circuit than the digi 003 I mean.
    I don't recommend ac ground lifts so I'd try a different wall outlet and an extension cord, of course if you could lift an input ground between the digi 003 and the converter that would solve the problem if the problems a ground loop.

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