Paul said:
I have seen many postings about micrphone problems with ASUS boards.
What I found out was that ASUS uses a stereo input jack on the
microphone, at least on my board. So if you connect just one mike to it,
it doesn't connect properly.
To connect one mike, what is needed is a stereo to mono adapter
available at any Radio Shack. Or get a Y cable and connect two mikes,
one each, to the left and right channel.
Hope this helps.
Ernie
The purpose of the "Stereo" plug is to carry Mic-in, Mic-pwr,
and Ground. Mic-pwr is connected to +5V through a 1K ohm or 2K ohm
resistor. This configuration is used for electret microphones and
should give a higher level signal than you would get from a passive
microphone (like maybe 20dB more).
Tip = Mic-in
Ring = Mic-pwr aka Bias
Sleeve = Ground
While I cannot find my old passive microphone with the "mono" plug
on the end, I think the Tip of the mono plug would touch the
Tip of the Asus connector. The rest of the mono plug would touch
the Ring and Sleeve simultaneously. This grounds the Bias signal,
but that is OK because it is current limited by the resistor I
mentioned above. In short, the passive microphone works just fine
- you'll have to use the "microphone boost" button in the Sound
control panel or Mixer.
You can see pictures of the mono and stereo plugs here:
http://www.colomar.com/Shavano/ringtip.html
My favorite source for info like this is
www.epanorama.net.
Their audio links page is here:
http://www.epanorama.net/links/audiopro.html
The "audiopro" page mentions this link:
http://www.shure.com/support/technotes/app-soundcard.html
One reason for the microphone plug on computer cases not working,
is the Mic-in and Mic-pwr connections get reversed by accident.
If you plug a raw stereo plug into the case connector and use
a voltmeter, you should find +5V resting on the middle conductor
(the "ring").
HTH,
Paul[/QUOTE]
Paul;
On my TX-97x the jack is a stereo jack with right and left channels. I
have tried it with two microphones and one goes to the left channel and
one goes to the right channel.
I have not seen a 1/8 stereo jack wired the way you describe but it is
certainly possible that other ASUS boards are wired this way but not the
TX97x
Ernie
