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?
I haven't used gstreamer. Some people like to use the rtsp protocol because it is low latency. I think gstreamer will implement that. There is also VLC and ffmpeg (avconv).
You may be interested in this old project which implemented half duplex communications : https://github.com/flatmax/halfDuplex
It is implemented in bash and uses ssh, ffmpeg and screen. It may
need some updating to work - for example it still uses ifconfig
rather then the ip command.
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 !
Thank you !
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
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 ScientistDion Research LLC | Analytics, Data Science & Visualizationdionresearch.com | @DionResearchLLC | PO BOX 12786 | WINSTON-SALEM NC 27117
On Sat, Sep 19, 2020 at 12:02 PM Randy Reichenbach via People <people@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.
The spec for that regulator:
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.
On Sat, Sep 19, 2020 at 1:55 AM Serge Ortega via People <people@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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