Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
In article <ifSoc.29260$vz5.23151@nwrdny01.gnilink.net>, "Karl"
<krwgmw@verizon.net> wrote:
> I have an Asus A7V8X mobo. The Onboard sound works however the microphone
> side does not or works intermittently I have tried different mics, all to no
> avail. Anyone else have this problem or a solution?
> Thanks Karl
You cannot be in six speaker mode, due to the sharing of functions
of the jacks. Try your experiment in two speaker mode to get started.
The ALC650 has two microphone inputs. Try selecting either one of them.
Use a high level input source for your testing. Connect a Walkman
or a MP3 player, to the microphone input. With a high level input,
the setting of the "microphone boost" check box in the mixer
won't matter.
A microphone has a low level output. Many AC-97 CODEC solutions have
a microphone boost setting, that amplifies the input by 20dB.
Clicking the boost button in the interface, brings up the gain.
In terms of microphone types, there are electret and dynamic mics.
The Asus motherboard puts bias on the Ring contact of the jack,
and that is used to power electret microphones. The Tip contact
is the actual mono microphone input. The FP_AUDIO1 header has
those contacts as well - MIC2 and MIC_BIAS can be used to
operate an electret microphone independently of the rear
audio connectors on the computer.
For that MIC2 pin of the FP_AUDIO1 header, if you currently
have nothing connected to that pin, touch it with your finger.
That should induce a 60Hz hum into the input, and is a quick
way to test that input, without having to find some wires to
make a proper connection.
HTH,
Paul
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