[OT] audio connection help

[Lennart Sorensen]

On Wed, May 17, 2006 at 11:55:29PM -0500, Sy Ali wrote:
> I'm hoping to stumble into a couple of people who know about audio.
> 
> I'm not sure how to search for answers, since these are all shortforms
> for audio terms.. and are a quite annoying to search for / research.
> 
> 
> I have a bit of a mystery on my hands with my motherboard (ASUS K8N)
> audio connections vs my case (Antec Sonata) front-case connections.
> 
> The motherboard has a block of 9 pins:
> 
> 1 2 3 x 4
> 5 6 7 8 9
> 
> 1 - agnd
> 2 +5VA
> 3 BLINE_OUT_R
> 4 BLINE_OUT_L
> 5 MIC2
> 6 MICPWR
> 7 Line out_R
> 8 NC
> 9 Line out_L
> x = not labelled/used.
> 
> Most of that makes sense.  The case, however, has a bunch of single
> lines which are labelled thusly:
> 
> FPOUT-R
> FPOUT-L
> MIC
> RET-R
> RET-L
> MIC BIAS
> MIC GND
> 
> I don't know how these match up.  On top of that, there are seven
> lines for 9 items on the motherboard.  8 if I think that NC means "no
> connection".

Well NC means no connection, and you don't need to power anything so the
+5VA can be left out.  Now you have 7 pins to use on each end.

Line Out R/L goes to FPOUT R/L.
BLINE OUT R/L goes to RET R/L
agnd goes to MIC GND.
MIC2 goes to MIC (Apparently MIC1 is on the back and MIC2 on the front
panel.  I guess it supports two different MIC inputs in the sound chip).
MICPWR goes to MIC BIAS (bias is for powering some part of certain
microphone types hence why power would go there).

That should take care of all 7 pins.

When you plug something into the headphone jack on the front, it should
automatically mute the rear outputs (which is why the return lines are
there).  Pretty handy.

Len Sorensen
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