M
Merak
Hello everyone!
I'm having problems using a Creative microphone (I got it with my former
Sound Blaster card) with the AD chip integrated in my Asus A7V880 mainboard.
First of all, my case has a front panel micrphone connector with three wires
named as follows:
/ \
MIC_DATA --------| |
\ /
+===+
MIC_VCC --------| | 3.5mm plug
|===| to soundcard
| |
GND --------| |
| |
+=======+
| |
I checked the above connections with a ohmeter. The pins are not shorted in
any way inside the front panel connector circuitry.
Now, my Asus mainboard has a FP_AUDIO connector with the following pinout:
BLINE_OUT_L . . LINE_OUT_L
. NC
BLINE_OUT_R . . LINE_OUT_R
+5VA . . MICPWR
AGND . . MIC2
The upper pins are for incoming and returning audio stereo signal (for front
panel headphone connector) and they work OK.
The first thing I did was connecting the mic wires this way:
MICPWR <-> MIC_VCC
MIC2 <-> MIC_DATA
AGND <-> GND
This way, the Creative microphone does NOT work (not even a weak signal,
nothing), while another microphone I have (one of those small clips on
headphones) works like charm.
Searching the net I found that Creative uses particular mics that require
power in order to work.
Keeping the aforementioned connections, I tested voltages on the front panel
mic jack.
/ \
tip (T) --------| |
\ /
+===+
ring (R) --------| | 3.5mm plug
|===| to soundcard
| |
sleeve (S) --------| |
| |
+=======+
| |
The SR and ST voltages are 5.02V, while the RT voltage is 0.00V.
Now, I was surprised to find that tip and ring have equal bias while no
microphone is connected.
I tried to connect MICPWR to +5VA, resulting in:
+5VA <-> MIC_VCC
MIC2 <-> MIC_DATA
AGND <-> GND
The results were exactly the same: ring and tip biased +5.02V.
As a test, I temporaily connected my old PCI Sound Blaster and read the
voltages on its microphone port: SR is 5.02V, but ST is 0.00V. When
connected to the old SB both my microphones work perfectly.
Now, what's the problem and how to solve it? Is it a strange issue of the
creative microphone? Or maybe it's the mobo's fault since MICPWR and MIC2
look shorted (same bias)?
Thanks in advance.
I'm having problems using a Creative microphone (I got it with my former
Sound Blaster card) with the AD chip integrated in my Asus A7V880 mainboard.
First of all, my case has a front panel micrphone connector with three wires
named as follows:
/ \
MIC_DATA --------| |
\ /
+===+
MIC_VCC --------| | 3.5mm plug
|===| to soundcard
| |
GND --------| |
| |
+=======+
| |
I checked the above connections with a ohmeter. The pins are not shorted in
any way inside the front panel connector circuitry.
Now, my Asus mainboard has a FP_AUDIO connector with the following pinout:
BLINE_OUT_L . . LINE_OUT_L
. NC
BLINE_OUT_R . . LINE_OUT_R
+5VA . . MICPWR
AGND . . MIC2
The upper pins are for incoming and returning audio stereo signal (for front
panel headphone connector) and they work OK.
The first thing I did was connecting the mic wires this way:
MICPWR <-> MIC_VCC
MIC2 <-> MIC_DATA
AGND <-> GND
This way, the Creative microphone does NOT work (not even a weak signal,
nothing), while another microphone I have (one of those small clips on
headphones) works like charm.
Searching the net I found that Creative uses particular mics that require
power in order to work.
Keeping the aforementioned connections, I tested voltages on the front panel
mic jack.
/ \
tip (T) --------| |
\ /
+===+
ring (R) --------| | 3.5mm plug
|===| to soundcard
| |
sleeve (S) --------| |
| |
+=======+
| |
The SR and ST voltages are 5.02V, while the RT voltage is 0.00V.
Now, I was surprised to find that tip and ring have equal bias while no
microphone is connected.
I tried to connect MICPWR to +5VA, resulting in:
+5VA <-> MIC_VCC
MIC2 <-> MIC_DATA
AGND <-> GND
The results were exactly the same: ring and tip biased +5.02V.
As a test, I temporaily connected my old PCI Sound Blaster and read the
voltages on its microphone port: SR is 5.02V, but ST is 0.00V. When
connected to the old SB both my microphones work perfectly.
Now, what's the problem and how to solve it? Is it a strange issue of the
creative microphone? Or maybe it's the mobo's fault since MICPWR and MIC2
look shorted (same bias)?
Thanks in advance.