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Audio-Injector / Octo

Octo sound card - 8 channel output and 6 channel input sound cards
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Octo Soundcard supplies phantom power? #19

Open ishaaniwani opened 4 years ago

ishaaniwani commented 4 years ago

Hello, I have 3 xlr microphones, that I plan to use a cable to turn into L and R RCA inputs. In order to record, the microphone needs power from the XLR cable. That means the sound card will have to send the power through the RCA inputs to the XLR microphones.

Does the Octo Soundcard support the capability? If so, how much power does it give?

flatmax commented 4 years ago

The Octo doesn't supply voltage over the codec lines.

Is your microphone an electret or condenser microphone ?

Electret microphones typically require less power then condenser microphones.

If you have condenser microphones then you will want to source a phantom power preamplifier.

If you have electret microphones, you will want to use an electret microphone preamplifier.

As microphones have low signal levels, you will also want to make sure they have enough preamplifier gain (or get a second preamplifier unit). Typically you can use a preamp with around 30 dB gain.

On 7/8/19 4:00 am, ishaaniwani wrote:

Hello, I have 3 xlr microphones, that I plan to use a cable to turn into L and R RCA inputs. In order to record, the microphone needs power from the XLR cable. That means the sound card will have to send the power through the RCA inputs to the XLR microphones.

Does the Octo Soundcard support the capability? If so, how much power does it give?

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nettings commented 4 years ago

@ishaaniwani, even if the Octo had this feature, it is impossible to have XLR phantom power from an RCA output. Phantom power requires a balanced (i.e. three-wire) connection.

flatmax commented 4 years ago

The isolated sound card introduces phantom power and a standardised analogue skin. The skin includes phantom power, you can see Vph here : https://github.com/Audio-Injector/AudioInjector-Analogue-Breakout-Standard/blob/master/AudioInjectorAnaBreakStdv1.pdf

nettings commented 4 years ago

Good to know. The OP however asked about the "RCA inputs", so I was assuming they used the default RCA breakouts. Are you still offering the balanced breakouts pre-made, or is it DIY only?