JohnSwenson;578362 Wrote: > As I understand it the issue is how AC mains leakage current flows > between boxes. With unbalanced the leakage current goes through the > shield which is the voltage reference for the "hot" conductor, thus the > noise generated from the leakage current is directly added to the > signal. With a balanced connection the shield is NOT used as the > voltage reference for the signal so any noise generated by the leakage > current flowing between boxes does not add to the signal. > > Note that this does NOT need galvanic isolation (such as from an audio > transformer) it just arises because neither of the conductors used for > carrying the signal are directly connected to ground such as IS the > case for unbalanced. I think you have got to the core issue here. When I spoke of galvanic isolation, I was thinking along these lines (that any leakages onto the gound planes do not become part of the signal), but I used the wrong terminology. Thank you for explaining it properly!
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