Sound card input impendence

[Animesh Maurya]

Hi all,

I'm using my sound card for data acquisition. It is inbuilt on my
Intel 845GL motherboard, named Avance AC97 Audio.

I need to know the input impendence(line in port) for calculating
coupling capacitor. Also interested to know max p-p voltage?

Any help in highly appreciated.

Thanks

AM

 

[Jamie]

it varies among sound cards a bit but 5k ohm on some Mic inputs
and 50K on line inputs. these are just some.
the levels for the line in are usually around .3 to .6 p-p
and mic input levels can be very sensitive and very alot among
sound cards.
if you work around .050 for the max average i think you should
be ok.



Animesh Maurya wrote:

Hi all,

I'm using my sound card for data acquisition. It is inbuilt on my
Intel 845GL motherboard, named Avance AC97 Audio.

I need to know the input impendence(line in port) for calculating
coupling capacitor. Also interested to know max p-p voltage?

Any help in highly appreciated.

Thanks

AM