Are there any optoisolators that are suitable to carry
analog audio over the normal frequency range of 20 to 20000 HZ?

	What I am trying to do is feed audio from a radio
receiver across the room to an audio mixer.  There are enough
computers and switching power supplies in the room that noise is
picked up by the shield of the audio line and ends up being
induced in to the radio via the chassis ground.

	If optoisolated, the noise would still be on the cable
but the path for it would break completely at the output side of
the isolator.

	I am not holding my breath but I figured I can ask
whether any such device exists or maybe a conventional
optoisolator will work if one conditions the input to the LED to
negate the distortion one would get by feeding audio biased to
light the LED halfway during silence and then go to full
brightness and almost fully off at maximum volume.

	One would hope for linear response.

	Thanks for any good ideas.

Martin McCormick WB5AGZ
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