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Front Audio Help - MIC_BIAS vs. VCC

 
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Bob64

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Since: Aug 30, 2003
Posts: 1



(Msg. 1) Posted: Sat Aug 30, 2003 1:06 pm
Post subject: Front Audio Help - MIC_BIAS vs. VCC
Archived from groups: alt>comp>periphs>mainboard>msi-microstar (more info?)

I have a Neo2 865Pe motherboard and a Chenbro PC61166 case and I need
some help hooking up the front audio.

Accoring to the manual, the pins are as follows:

1 - AUD_MIC (Front panel MIC input signal)
2 - AUD_GND (Ground used by analog circuits)
3 - AUD_MIC_BIAS (Microphone power)
4 - AUD_VCC (Filtered +5V used by analog audio circuits)
5-10 - LINE-IN/LINE-OUT, etc.

The wires in question are as follows:

Red - MIC-IN
Black - GND
White - MIC-VCC
All other wires are line-in/line-out
and I've got a handle on what to do with those.

I am assuming that Red(MIC-IN) goes to Pin-1(AUD_MIC), and that
Black(GND) goes to Pin-2(AUD_GND).

But I need some direction as to whether White(MIC-VCC) should be
connected to Pin-3(AUD_MIC_BIAS) or Pin-4(AUD_VCC) or whether it
matters.

Thanks - I really appreciate it.

Bob

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John95

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Since: Jun 27, 2003
Posts: 40



(Msg. 2) Posted: Sun Aug 31, 2003 3:46 pm
Post subject: Re: Front Audio Help - MIC_BIAS vs. VCC [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

I don't know your hardware Bob, but the electret mikes need power to work,
so no volts on pin 3 no noise. Pin 4 I assume will power something like a
headset with built in amplifiers or tone filters. If you do not have such a
thing you do not need power on pin 4, HTH.
John

"Bob" <bnovak.TakeThisOut@charter.net> wrote in message
news:41f31117.0308300906.480fba7e@posting.google.com...
| I have a Neo2 865Pe motherboard and a Chenbro PC61166 case and I need
| some help hooking up the front audio.
|
| Accoring to the manual, the pins are as follows:
|
| 1 - AUD_MIC (Front panel MIC input signal)
| 2 - AUD_GND (Ground used by analog circuits)
| 3 - AUD_MIC_BIAS (Microphone power)
| 4 - AUD_VCC (Filtered +5V used by analog audio circuits)
| 5-10 - LINE-IN/LINE-OUT, etc.
|
| The wires in question are as follows:
|
| Red - MIC-IN
| Black - GND
| White - MIC-VCC
| All other wires are line-in/line-out
| and I've got a handle on what to do with those.
|
| I am assuming that Red(MIC-IN) goes to Pin-1(AUD_MIC), and that
| Black(GND) goes to Pin-2(AUD_GND).
|
| But I need some direction as to whether White(MIC-VCC) should be
| connected to Pin-3(AUD_MIC_BIAS) or Pin-4(AUD_VCC) or whether it
| matters.
|
| Thanks - I really appreciate it.
|
| Bob

 >> Stay informed about: Front Audio Help - MIC_BIAS vs. VCC 
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Gary Tait2

External


Since: Aug 24, 2003
Posts: 24



(Msg. 3) Posted: Sun Aug 31, 2003 5:23 pm
Post subject: Re: Front Audio Help - MIC_BIAS vs. VCC [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

On 30 Aug 2003 10:06:27 -0700, bnovak RemoveThis @charter.net (Bob) wrote:

 >I have a Neo2 865Pe motherboard and a Chenbro PC61166 case and I need
 >some help hooking up the front audio.
 >
 >Accoring to the manual, the pins are as follows:
 >
 > 1 - AUD_MIC (Front panel MIC input signal)
 > 2 - AUD_GND (Ground used by analog circuits)
 > 3 - AUD_MIC_BIAS (Microphone power)
 > 4 - AUD_VCC (Filtered +5V used by analog audio circuits)
 > 5-10 - LINE-IN/LINE-OUT, etc.
 >
 >The wires in question are as follows:
 >
 > Red - MIC-IN
 > Black - GND
 > White - MIC-VCC
 > All other wires are line-in/line-out
 > and I've got a handle on what to do with those.
 >
 >I am assuming that Red(MIC-IN) goes to Pin-1(AUD_MIC), and that
 >Black(GND) goes to Pin-2(AUD_GND).
 >
 >But I need some direction as to whether White(MIC-VCC) should be
 >connected to Pin-3(AUD_MIC_BIAS) or Pin-4(AUD_VCC) or whether it
 >matters.
 >
 >Thanks - I really appreciate it.
 >
 >Bob

To pin 3 AUD_MIC_BIAS. It is current limited (so you can plug in a
dynamic mic, and not short anything out). The AUD_VCC is, if anything,
just fused, if not straight filtered +5V.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Front Audio Help - MIC_BIAS vs. VCC 
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