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LEMO and "transformer coupled audio"

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dave.saylor.aircrafters(a
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Posted: Mon May 21, 2012 8:43 pm Post subject: LEMO and "transformer coupled audio"

We've wired quite a few planes with powered LEMO jacks for Bose and

Lightspeed headsets.  It's usually a very straightforward case of

piggybacking the audio onto the existing mic and phone jacks, and

adding a power wire.  The noise canceling circuit normally grounds

through the audio lo and works very well.



But we recently had a case where the aircraft had "transformer coupled

audio".  The Bose instructions warn you about this but don't really

say what to do about it.  What happens is, the noise canceling circuit

doesn't see a ground so it doesn't turn on.  In our case we just had

to run the power ground (as opposed to audio ground) to a local

airframe ground, and it worked just fine.



Dave Saylor

831-750-0284 CL

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