[AudioI] Phantom powered inputs XLR pre-amplifier

[Samir Sabljic]

Hello Matt,

Thank you for your reply.
It is unfortunate the XLR amplifier does not have phantom powered inputs,
but it sounds promising the soundcard does have a phantom powered line.
Is it possible to still use the XLR pre-amplifier and the pro soundcard,
with a few small modifications to provide phantom power to both microphone
inputs?
If this is possible, which modifications would need to be done?

Best regards,

Samir Sabljic
Junior datascientist
Datacadabra



Op vr 22 apr. 2022 om 02:55 schreef Matt Flax <matt at audioinjector.net>:

> 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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>
>
>
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