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Funny thing is, that's actually my first name and the first letter of my surname. Not everything is vulgar ;)
That's because of ground loops. I've had the same issue in one of my projects. The simplest way to get rid of it is to use an audio isolator, as can be found here: http://www.ebay.com/sch/i.html?_from=R40&_sacat=0&...Hope that will help you.
LM386 tube amp [homage]
I'd say at least 20cm from experience, but with this larger coil maybe 1 to 2 meters to be on the safe side
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