nuckollsr(at)cox.net
Guest
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 Posted: Thu Aug 17, 2006 8:39 pm Post subject: MP3 player and microphone input |
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| Quote: | Bob...
I am trying to connect my mp3 player to my audio panel/intercom through
the copilot microphone jack. I got it to work once for a very short
test. After that, my mp3 player would no longer work. (It may be
fried) I connected the Player ground to the sleeve (mic ground). Then I
connected The left and right audio together and connected them to the
audio hi (inner ring) tab of the micro phone jack.
My question...should I have connected the left and right audio from the
mp3 to the tip (ptt) instead of the audio hi?
Also... did I fry my mp3 player by connecting it to the audio hi of the
mic jack?
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Perhaps.
The "Mic Hi" lead from an aircraft audio system
has a dual purpose. It accepts audio from the microphone
but also supplies POWER to the microphone. Aircraft mics
are electronic descendants of the carbon microphones used
in early radio systems (and in telephones for over a century).
See:
http://users.pandora.be/oldmicrophones/microphone_history.htm
http://www.aerialpursuits.com/comms/mikes.htm
The carbon mic needs to be POWERED by the system over the
same leads that bring audio from the mic into the radio.
Contemporary mics have electronics that make the emulate
the original carbon mic operating philosophy. It may be
that voltage that appears on the microphone jack's audio
pin zapped your MP3 player. I'm sure that the MP3 player
was not designed to accept or expect any level of DC
power applied to its output jack.
Bob . . .
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
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