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lumkes(at)msoe.edu
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 Posted: Sat Jan 31, 2009 7:24 am Post subject: PC Headset compatibility |
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Hello,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
I have a Plantronics Audio 480 headset with a boom mic and noise isolating ear buds and am wondering what it would take (besides the physical connectors) to use it while flying. It seems that computer soundcards do have a bias voltage of 5V for the mic while aircraft are in the range of 8-16V. Will this mic work as is, does it need an adapter, or is it basically hopeless? The earphones differ in impedance but will at least work for a quick test, and I can build an impedance adapter using a simple part from Radio shack. Any thoughts?
John
Zenith 601HD (forever in process)
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jetboy
Joined: 22 Jul 2006
Posts: 233
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| Posted: Sun Feb 01, 2009 1:04 pm Post subject: Re: PC Headset compatibility |
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Aircraft mic lines are equivalent to a carbon granule mic characteristic. That is with around 8V supply the audio output level will be 500 mV P-P into a 600 ohm load.
The PC mic is likely an electret capacitance mic which on its own is very low voltage output. You can salvage the required amplifier and impedance buffer from an aircraft headset that uses the electret mic.
Another issue is domestic electret mics and amplifiers are not suitable for high noise environment and may overload in aircraft. Cheap "aviation" headsets imported without known branding are very good at this.
Ralph
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Ralph - CH701 / 2200a |
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