NF7-S Mic Bias

[Jon]

Archived from groups: alt.comp.periphs.mainboard.abit (More info?)

Just installed an NF7-S into a new case, and all is running fine. However,
I'm at a loss about one of the wires that connects to my front panel
microphone jack. The mic jack works fine, but I have one wire left over --
don't know where it goes. It's labeled 'Mic Bias'. Does anyone have a clue
what pin that needs to go on, and on what header? I'm just running a pair
of regular desktop speakers; nothing fancy. There's nothing in the manual
as far as I can tell. Thanks in advance for your help.
Jon

 

[Robert]

Archived from groups: alt.comp.periphs.mainboard.abit (More info?)

A microphone bias is a DC voltage required for a condenser microphone
element and should not be supplied to a dynamic microphone.

Mic bias should be pin 3 on header FPIO2 according to these two references:
http://www.minmaw.com/FPIO_Design_Guideline_final%20v10.pdf
http://www.abit-usa.com/faq/mediaxp/2002080901.php

Note that on page 3-15 of the NF7-S manual indicates that this pin has "no
conn".

"Jon" <jpr_me@REMOVETHISYahoo.com> wrote in message
news:10ak1mbfr23948b@corp.supernews.com...
> Just installed an NF7-S into a new case, and all is running fine.
However,
> I'm at a loss about one of the wires that connects to my front panel
> microphone jack. The mic jack works fine, but I have one wire left
over --
> don't know where it goes. It's labeled 'Mic Bias'. Does anyone have a
clue
> what pin that needs to go on, and on what header? I'm just running a pair
> of regular desktop speakers; nothing fancy. There's nothing in the manual
> as far as I can tell. Thanks in advance for your help.
> Jon
>
>

 

[Jon]

Archived from groups: alt.comp.periphs.mainboard.abit (More info?)

Thank you very much, esp. for the second reference.
Jon

"Robert" <notmy@email.address> wrote in message
news:GMWdnQiXQMxZuzfdRVn-hg@comcast.com...
> A microphone bias is a DC voltage required for a condenser microphone
> element and should not be supplied to a dynamic microphone.
>
> Mic bias should be pin 3 on header FPIO2 according to these two
references:
> http://www.minmaw.com/FPIO_Design_Guideline_final%20v10.pdf
> http://www.abit-usa.com/faq/mediaxp/2002080901.php
>
> Note that on page 3-15 of the NF7-S manual indicates that this pin has "no
> conn".
>
> "Jon" <jpr_me@REMOVETHISYahoo.com> wrote in message
> news:10ak1mbfr23948b@corp.supernews.com...
> > Just installed an NF7-S into a new case, and all is running fine.
> However,
> > I'm at a loss about one of the wires that connects to my front panel
> > microphone jack. The mic jack works fine, but I have one wire left
> over --
> > don't know where it goes. It's labeled 'Mic Bias'. Does anyone have a
> clue
> > what pin that needs to go on, and on what header? I'm just running a
pair
> > of regular desktop speakers; nothing fancy. There's nothing in the
manual
> > as far as I can tell. Thanks in advance for your help.
> > Jon
> >
> >
>
>