[AudioI] mic pre-amps

[Matt]

On 4/3/20 5:15 pm, ae0000--- via People wrote:
> Hello,
>
> I'm creating a sampler with a raspberry pi4 and i'm having trouble 
> with the USB microphone line levels from some sources (some are fine, 
> some are WAY too low).
>

Awesome ! I heard a track yesterday where the performer talked to a 
crowd, sampled their cheer and then added layers over that - phenomenal !

I wonder what kind of microphone you are planning to use ?

Dynamic mics don't need power, just lines. Condenser mics need phantom 
(can be 12v, 24v or 48v depending on the mic.)

Electret mics require mic bias voltages.


> I suspect that your products are what I am after, but just wanted to 
> check?
>
> Would the Ultra soundcard be what I am after or is it overkill? The 
> specs sounds pretty amazing
> Does it fit a pi4 ?
>

All our products fit a Pi 4 and 3 and probably 2 as well.

The electret mics would be supported by the cheaper stereo cards (zero 
or the original) or the Ultra 2 card. You can do dynamic mics with all 
of them, however keep in mind that you need gain for microphones. Some 
of the soundcards will provide gain on the input stage. The Ultra 2 card 
drops the gain by around 6:1 on the input stage, through the balanced 
lines and keeps the gain 1:1 through the RCA input lines.

Because of the way we design our soundcards, you can also implement your 
own preamplifiers (with the exception of the original stereo soundcard).


> Many thanks
>
Matt


> Andrew
>
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