[AudioI] zero soundcard with phantom power

[Serge Ortega]

Good morning all

Many thanks to all for your very informative answers.
My goal is to develop a small wifi intercom system with headsets based 
on raspberry Zero. I am thinking of powering them with LiPo batteries or 
9V batteries ... I am in the process of designing.
There are different models of headsets, some dynamic and others static, 
hence the need to use a phantom power supply of at least 12V.
If you have any suggestions to help me develop this project, thank you 
very much.
In terms of development, I am thinking of using gstreamer: what do you say?

Matt, I congratulate you on the development of your products. Your offer 
is already very complete and geared towards "professional" equipment. 
Thank you so much !

Serge

Le 20/09/2020 à 09:20, Matt via People a écrit :
>
> This is all good information. I got a bit more to add.
>
> The zero will give you power for an electret capsule microphone - 
> typically < 3V power.
>
> The analogue breakout standard (AI-ABS) implements the 48V phantom 
> power for you : 
> https://github.com/Audio-Injector/AudioInjector-Analogue-Breakout-Standard
>
> https://github.com/Audio-Injector/AudioInjector-Analogue-Breakout-Standard/blob/master/AudioInjectorAnaBreakStdv1.pdf
>
> The power header gives > 48V power. You will want to regulate this 
> with a 48 V linear regulator before using it.
>
> Our first soundcard to implement the AI-ABS is the Isolated soundcard 
> (already available for purchase). You can design a preamplifier for 
> this board which uses the phantom power. Alternatively you can wait 
> for a later preamplifier release which will implement an optional 
> phantom powered microphone preamplifier.
>
> Let us know which direction you plan to go, plenty of Audio Injectors 
> here with great suggestions and willing to help.
> Matt
>
> On 20/9/20 3:00 am, Francois Dion via People wrote:
>> Behringer PS400 is about $30 street price and does the job. Provides 
>> about 30mA on 48V. Can also power phantom 12V.
>>
>>
>> Francois Dion, Chief Data Scientist
>> Dion Research LLC | Analytics, Data Science & Visualization
>> dionresearch.com <http://dionresearch.com> | @DionResearchLLC | PO 
>> BOX 12786 | WINSTON-SALEM NC 27117
>>
>>
>>
>> On Sat, Sep 19, 2020 at 12:02 PM Randy Reichenbach via People 
>> <people at lists.audioinjector.net 
>> <mailto:people at lists.audioinjector.net>> wrote:
>>
>>     That would be nice, right?  You could certainly add phantom power
>>     to a Zero card, but understand that Pro mics like the NT5 require
>>     48VDC phantom power, and the Pi and AI Zero just have 5v and 3.3v
>>     onboard.
>>
>>     So, you could add a separate phantom power supply. Plenty of
>>     examples of that if you google.
>>
>>     Or you could use a buck/boost converter to take the 5V and boost
>>     it to 48.  Mics only require single digits of mA, so the power
>>     requirement is actually rather low.
>>
>>     Here's an example of a 9v to 48v.
>>     https://www.electronics-lab.com/project/9v-to-48v-dc-dc-converter/
>>
>>     The spec for that regulator:
>>     https://www.sparkfun.com/datasheets/IC/MC34063A.pdf
>>
>>     suggests it'll work down to 3v, so there you go.
>>
>>     OR it's likely that AudioInjectors Preamp board would have you
>>     covered, though strangely, it doesn't mention phantom power.  As
>>     much as I love my AI cards, I find the available info about them
>>     to be rather lacking.
>>     http://www.audioinjector.net/xlr-preamp
>>
>>
>>
>>     On Sat, Sep 19, 2020 at 1:55 AM Serge Ortega via People
>>     <people at lists.audioinjector.net
>>     <mailto:people at lists.audioinjector.net>> wrote:
>>
>>         Hi everybody
>>
>>         I would like to know if it is possible to use a standard
>>         electret
>>         microphone (like Rode NT5 for instance) with a zero soundcard ?
>>         Is the power like a phantom ?
>>
>>         Thanks for your answer
>>         Sergio
>>
>>
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>>
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