Hi,

I went to Creative . com, but they don't list the actual input
impedance or level (relative to 0 dbU at the line out) of the
microphone input jack for their Audigy PCI boards.

Does anyone know what those numbers are -- input level and impedance of
the microphone input? I would assume that any commercial audio card
would have the same specs. for their microphone inputs.

I want to make a simple connector that routes the stereo headphone
output of the audio card to the microphone input, using 4 fixed
resistors as an attenuator/mixer, but I need to get an idea of how much
attenuation is needed.

I could just experiment with a couple of pots, but the
computer-in-question is in a location not conducive to experimentation.
Plus, I want the attenuator/mixer to be accurate, and not subject to
some arbitrary level setting in the recording software.


Thanks,
Tom P.

tlbs wrote:

I want to make a simple connector that routes the stereo headphone
output of the audio card to the microphone input, using 4 fixed
resistors as an attenuator/mixer, but I need to get an idea of how much
attenuation is needed.

30 dB should get you into the range where you can use the Mic Input
level control. It's probably around 1500 ohms. And no, I don't know the
exact numbers, but I know what typically works.

Mike Rivers wrote:
tlbs wrote:

I want to make a simple connector that routes the stereo headphone
output of the audio card to the microphone input, using 4 fixed
resistors as an attenuator/mixer, but I need to get an idea of how much
attenuation is needed.

30 dB should get you into the range where you can use the Mic Input
level control. It's probably around 1500 ohms. And no, I don't know the
exact numbers, but I know what typically works.

Thanks!

I also realized that I can "experiment" on my home computer, and the
final result can be taken to the remote computer. I'll use 30 dB as a
starting point.

Tom