[AudioI] mic pre-amps

[ae0000 at gmail.com]

Hi Matt,

Thanks so much for the response.

I'm actually testing this with synths and the difference between the line
levels is quite massive. However at some point a mic would be fun to add
too.

>From what you have said I think I will grab a Ultra2.

Thanks again

Andrew


On Wed, 4 Mar 2020 at 21:10, Matt <matt at audioinjector.net> wrote:

>
> On 4/3/20 9:05 pm, Matt wrote:
>
>
> 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.
>
>
> I also forgot to mention that the Ultra 2 and the stereo cards have
> electret preamps built in as well. You can swap them out in some way for
> your own electret mics if that is what you would like to use. These codecs
> which support electret microphones have good onboard input audio buffers
> with large gain capability - particularly well suited to low level signals
> which you get from microphones.
>
>
> 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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