[AudioI] Soundcard with two electret mic preamps

[Matt]

Hi Theis Romme,

You can connect two Electret microphones to the zero card, however you
will need to mix them together using something like an opamp to do
that. You can use a summing opamp like this :
https://www.electronics-tutorials.ws/opamp/opamp_4.html
It will be a little tricky to do this because you need a clean analogue
line to power the opamp, but you could drive it off a 3.3v rail if you
can find a suitable opamp.

Another way to get 2 electret mics is to use the ultra soundcard which
has 2 electret microphone onboard - you can also access the mic header
to put your own electrets on it if you like.

Matt

On Tue, 2021-04-13 at 14:18 +0200, Theis Romme Larsen via People wrote:
> Hi
> 
> Have a Zero soundcard and i works. I need to attach 2 x Electrect
> mic´s at the same time and still have the soundcard to power the
> headphones. All this i working  with external preamps for the mic´s,
> and the mic´s are also working with the omboard mic preamp, but there
> is only one preamp. Do you have a card that can handle 2x Electret
> mic and power headphones at the same time?
> 
> 
> Med venlig hilsen / Best Regards
> 
> Theis Romme
> TR Lyd
> Phone: +45 40592554
> 
> 
> 
> 

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