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757 mic bias voltage

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gyoung

Joined: 09 Jan 2006
Posts: 211
Location: Republic of Texas

Posted: Tue Apr 21, 2009 7:18 am Post subject: 757 mic bias voltage

I've got a friend  that flys 757's using a Bose headset and has the mic get hot (warm) during  the course of a flight, not burn-your-lips-hot, but too hot. Talked to the Bose  service mgr here at Sun n Fun and he wants to know what the mic bias voltage is  since a replacement mic didn't fix it. FWIW, the mic is live continuously  because of the CVR. I thought there might be someone in the brain  trust here that might know the answer or have any other ideas. It's not a  problem in GA aircraft - he flew with me to SnF in my Navion for 5 hrs and had  no problem. Likewise none in his GA airplanes.

  

 

Regards, 

Greg Young  

  

   [quote][b]

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