Yes, the card's circuit is very similar to that provided in the wm8731 datasheet. You can use that as a reference.

I've attached the input impedance to the codec.

You can most certainly replace the potentiometer, the middle pin is normally the signal pin. In the attachment you'll notice the input resistance in series with the signal - also the AC coupling caps.

Matt

Hi,

Is there any way I could get a schematic or specs about the stereo card? It would help me understand what inputs to provide to the line in. The WM8731 spec sheet has some info of recommended circuits to provide to the line in pin. However these don't have the potentiometer. I was thinking about replacing the potentiometer with a resistor since I don't need the variable resistance.

Ryan

On Wed, Jan 26, 2022 at 7:03 PM Matt Flax <matt@audioinjector.net> wrote:

Hi,

You can with external preamplifiers. The ultra card has two electret
microphone inputs if you would like a different option.

Matt

On 26/1/22 14:54, Ryan Cole via People wrote:
> Hi all,
> I am wondering if I can connect two ECMs to the RCA inputs on the
> audioinjector stereo board. I have been using the onboard microphone,
> but would like to connect two ECMs via the RCA inputs if possible to
> record in stereo. Is this possible?
> Thanks,
> Ryan
>
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