Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
In article <mn.33167d515693c7e6.13446@thx.fr>, id wrote:
> hi paul
>
> i've connected same at 3.4 of
>
http://www.thermaltake.com/support/installguide/chassis/Damier.pdf
> page 12
>
> MIC-IN ---------> MIC2 X X AGND <-------- GND
> MIC-VCC -------> MICPWR X X NC
> EAR-R -----> Line_out_R X X bline out R => disconnect that ?
> NC X
> EAR-L -----> Line_out_L X X bline out L => disconnect that ?
>
>
> bline out are useless ??
>
> tia
If you look in the Asus manual for the P5AD2, the bline_out
pins are no longer provided. The Azalia sense lines are
connected there now.
The old way of doing AC'97 was like this:
(The Damier case doesn't have the switch, and shorts the
line_out and bline_out together.)
\ headphone_mute_contacts
___. \.___ (switch opens when headphones
/ \ are plugged in)
| |
sound_chip----X X-------------- rear_lineout_connector
line_out bline_out
The old way of doing things was for some extra contacts on the
headphone jack on the front panel, to mute the output of the
rear (lime colored) lineout jack on the back of the computer.
When the headphone was plugged in, the "switch" shown above
opens, and then sound no longer comes out on the rear lineout
jack.
I suspect the Azalia AC'97 header looks like this, because
otherwise there would be no way to get a signal on lineout
on the back of the computer.
\ headphone_mute_contacts
___. \.___ (Not connected)
/
|
sound_chip--+----X X +------ rear_lineout_connector
| line_out nc |
| |
\________________________/
(wired inside motherboard)
What this would mean, is the rear lineout connector would not
have a mute function. The headphone and the rear lineout would
always have a signal on them. The extra contact would not be
needed.
Please test this function and report what you find. I.e. With
the extra wires unconnected to anything, plug speakers into
Lineout on the rear of the computer, and see if they get
a signal while the headphones are also plugged into the
front of the computer. That will prove or disprove the
theory in the second picture.
By the way, your Damier case does not have a mute function,
and the bline_out and line_out are shorted together
permanently, so that there is a signal on the headphones
and the rear lineout all the time. Some other computer
cases have the headphone_mute_contacts shown above, and
then the line_out and bline_out use completely separated
wires.
HTH,
Paul
ual USB2.0, IEEE1394 Firewire, audio & speaker ports
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