Just a bit of clarification on galvanic isolation via transformers,
there seems to be some mis-understanding about them by some people.
These devices are wideband transformers designed to pass a very broad
range of high frequncies. They block DC and low frequencies, but pass
most high frequencies. So they work well at blocking "ground loops" (60
or 120 Hz), but any high frequency noise on the S/PDIF stream is going
to go right on through the transformer. 

They can even make it worse. ALL transformers have various resonances,
if the circuit the transformer is in doesn't damp those resonances they
can wind up increasing certain incoming noise frequencies.

John S.


-- 
JohnSwenson
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