[AudioI] mic pre-amps

[Matt]

On 5/3/20 5:14 pm, ae0000--- via People wrote:
> 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.
>

Oh ok, I would imagine anything from RCA line level (+- 1 V) to balanced 
pro levels (+- 10 v).

What was your experience in voltage levels ?


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

Its a good card.


> Thanks again
>
> Andrew
>
>
> On Wed, 4 Mar 2020 at 21:10, Matt <matt at audioinjector.net 
> <mailto: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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>>
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