On 4 Jan 2007 14:23:41 -0800, "YKhan" <yjkhan RemoveThis @gmail.com> put finger to
keyboard and composed:
>On Jan 4, 5:14 pm, Michael Daly <michaeld... RemoveThis @foo.bar> wrote:
>> Yousuf Khan wrote:
>> > What would be causing such a simple thing to
>> > start degrading over time like this?Corrosion or a loose connection in the mic socket? That usually doesn't cause a
>> slow degradation, but will cause incremental (good connect - mediocre connect -
>> no connect) over time. If it's a preamp problem, I doubt it's made of discrete
>> components so there's not much you could do.
>
>Thanks for the reply, this time it turned out that it was the
>microphone itself at fault, unlike the last time. Last time I spent a
>bit of money buying new microphones to test out, and it turned out it
>was an issue with the mic port. This time I didn't bother and it turned
>out it was the mic now.
The next time you have a problem I'd connect a dummy stereo plug and
measure the voltages at the tip and ring terminals. Typically you will
see a clean +5V supply which is generated by the sound card to power
the FET amp inside a condenser/electret microphone. On some sound
cards you will see this supply voltage on both the tip and ring
terminals, on others the supply will be applied only to the ring
terminal (the tip is the signal input).
See
http://www.epanorama.net/circuits/microphone_powering.html#soundcard
Also be aware that the preamp in the sound chip is optimised for
condenser mikes. These have a much higher output than dynamic mikes.
Maybe that's why you have a "boost" option ???
BTW, your question is OT for this group.
- Franc Zabkar
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>> Stay informed about: Microphone plug getting worse over time