Re: [Alsa-user] microphone gain?

[<Ful...@si...>]

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> I plug in my new Plantronics .Audio 40 headset and try to use the
> internet telephony app (Skype)
> But no one can hear me. I try to record with Audacity and my blowing
> right into the mic barely leaves a trace on the oscilloscope. I play it
> back and can barely hear anything.
> What is wrong? I have mic boost on in my alsamixer settings and
> obviously the capture is on or there would be nothing at all. But what
> there is is next to nothing or inaudible. The microphone is supposed to
> be as sensitive as any electret type mic that Plantronics puts in any of
> their headsets--which is the brand that Skype reccommends.

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I don't know if this is your issue or not, but I'm trying to use
the same headset on both my desktop, and my laptop.  (the same unit,
not just the same model)  I find that the volume on the laptop
is substantially lower than on the desktop.

So its either the gain inside the mic pre-amp on the respective
sound cards, or the level of the bias voltage needed on condenser
mics.  (I haven't checked my bias voltage yet.)