[AudioI] stereo microphone using RCA input

[Matt Flax]

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
 

 
On 27/1/22 16:25, Ryan Cole via People wrote:
 
 
 
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 at audioinjector.net <mailto:matt at 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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