P4C800-E DLX Front Panel Audio Connector

  • Thread starter Thread starter Tony
  • Start date Start date
T

Tony

Need help

I have a lian Li PC-6077 case.
The front panel has the cables with the fiddly single pin
connectors. Was able to buzz out the usb and firewire
and sure they are connected proper. The audio, I am not
sure. The wire connectors are labelled as so:

Mic Data
Mic Vcc
Mic Gnd
Ear Gnd
Ear R
Ear L

I am sure the Ear R goes to Line Out_R
and Ear L goes to Line Out_L as these two wires
have two connectors on them to replace the jumper caps
on the motherboard header.

Where do the others go? Will there be damage if I use the
trial and error method?
 
"Tony" said:
Need help

I have a lian Li PC-6077 case.
The front panel has the cables with the fiddly single pin
connectors. Was able to buzz out the usb and firewire
and sure they are connected proper. The audio, I am not
sure. The wire connectors are labelled as so:

Mic Data
Mic Vcc
Mic Gnd
Ear Gnd
Ear R
Ear L

I am sure the Ear R goes to Line Out_R
and Ear L goes to Line Out_L as these two wires
have two connectors on them to replace the jumper caps
on the motherboard header.

Where do the others go? Will there be damage if I use the
trial and error method?
Click to expand...

For a microphone:

Tip = Mic_Data
Ring = Mic_Bias (1K or 2K ohm resistor to +5V, _not_ a direct +5V)
Sleeve = Mic_GND

For a stereo speaker/headset

Tip = Left
Ring = Right
Sleeve = Ground

The power on the microphone jack is for electret microphones. Some
microphones will actually short Tip to Ring, and the 2K ohm pullup
resistor provides the power. The resistor is on the motherboard
and limits the current coming from +5V - the resulting signal is
called a Bias, rather than a supply as such.

Ref: http://www.epanorama.net/circuits/dynamic_to_electretinput.html

The connections will look something like this:

Mic_Data ----------- MIC2 X X AGND -------- Mic_GND and Ear_GND
Mic_Bias --------- MICPWR X X +5VA (No connection)
Ear_R -------- Line_out_R X X BLINE_OUT_R (Back conn won't work)
NC X
Ear_L -------- Line_out_L X X BLINE_OUT_L (Back conn won't work)

Issues:

You have one ground pin and two ground signals. Use your ohmmeter,
to see if the front panel ground signals are already joined together
at the front panel - this will make it OK to connect only one
of the ground wires. If both are needed, about the only thing I
can suggest, is using one of the two center-most pins of the
AUX white 1x4 connector on the motherboard as a GND, as they are
both supposed to be grounded and being part of the audio circuit,
should be analog ground quality (if there is such a thing on a
motherboard :-) The pins may be too small to get a good grip
via the case ground wire...

Since your earphone connections don't have return signals to put
on the two BLINE signals, the Lime connector on the back of the
computer will not work, as long as the case front panel is
connected to the 2x5 header, in place of the two jumpers that
were there originally.

HTH,
Paul
 
Thanks Paul works a charm.
Paul said:
For a microphone:

Tip = Mic_Data
Ring = Mic_Bias (1K or 2K ohm resistor to +5V, _not_ a direct +5V)
Sleeve = Mic_GND

For a stereo speaker/headset

Tip = Left
Ring = Right
Sleeve = Ground

The power on the microphone jack is for electret microphones. Some
microphones will actually short Tip to Ring, and the 2K ohm pullup
resistor provides the power. The resistor is on the motherboard
and limits the current coming from +5V - the resulting signal is
called a Bias, rather than a supply as such.

Ref: http://www.epanorama.net/circuits/dynamic_to_electretinput.html

The connections will look something like this:

Mic_Data ----------- MIC2 X X AGND -------- Mic_GND and Ear_GND
Mic_Bias --------- MICPWR X X +5VA (No connection)
Ear_R -------- Line_out_R X X BLINE_OUT_R (Back conn won't work)
NC X
Ear_L -------- Line_out_L X X BLINE_OUT_L (Back conn won't work)

Issues:

You have one ground pin and two ground signals. Use your ohmmeter,
to see if the front panel ground signals are already joined together
at the front panel - this will make it OK to connect only one
of the ground wires. If both are needed, about the only thing I
can suggest, is using one of the two center-most pins of the
AUX white 1x4 connector on the motherboard as a GND, as they are
both supposed to be grounded and being part of the audio circuit,
should be analog ground quality (if there is such a thing on a
motherboard :-) The pins may be too small to get a good grip
via the case ground wire...

Since your earphone connections don't have return signals to put
on the two BLINE signals, the Lime connector on the back of the
computer will not work, as long as the case front panel is
connected to the 2x5 header, in place of the two jumpers that
were there originally.

HTH,
Paul
Click to expand...
 
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