[AudioI] Phantom powered inputs XLR pre-amplifier

[Matt Flax]

Hi there,

Sounds like a great project. The Pro. soundcard provides a phantom power 
line, you can see the Vph pin in the AIABS specification : 
https://github.com/Audio-Injector/AudioInjector-Analogue-Breakout-Standard/blob/master/AudioInjectorAnaBreakStdv1.pdf

The XLR preamplifier provides balanced input and output using XLR 
connectors. There is also an RCA preamplifier for single ended 
applications. At this point in time, neither preamplifier provides 
phantom power. The XLR preamplifier is designed to output high voltage 
lines with output amplification. The input lines on the XLR preamplifier 
attenuate the input. This preamplifier isn't suitable to typical 
microphone amplification requirements on the input.

It would be possible to create your own preamplifier using the phantom 
power for a hydrophone/microphone type application. Normally microphones 
require a large gain (e.g. 30 dB) on the input side.

I notice that the hydrophone specification 
(https://www.aquarianaudio.com/AqAudDocs/H2a_XLR_manual.pdf) only 
requires a small current for power, this is good. The 48V specification 
is good too as the Pro. soundcard provides that power line on its power 
connector.

Matt

On 21/4/22 22:17, Samir Sabljic via People wrote:
> Good afternoon,
>
> For a project in Datacadabra we are working with hydrophones. The goal 
> is to classify sounds in water using hydrophones. We would like to 
> connect 2 hydrophones to the XLR preamplifier from Flatmax. The 
> hydrophones we intend to use are the H2A-XLR Hydrophones from Aquarian 
> Hydrophones. This is a link to the hydrophones: 
> https://www.aquarianaudio.com/h2a-xlr-hydrophone.html
>
> One of the requirements for powering these microphones is phantom 
> power. Does the XLR pre-amplifier provide phantom power, so we can 
> connect these microphones to the XLR pre-amplifier, and then to a pro 
> sound card (also from Flatmax) and raspberry pi?
>
> Kindly waiting for your reply.
>
> Best regards,
>
> Samir Sabljic
> Junior datascientist
> Datacadabra
>
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