[AudioI] mic pre-amps

[Matt]

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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