[AudioI] Pre-Amplifier for stereo condenser microphones

[Matt]

Sounds remarkably atmospheric !

Hmmm ... the zero soundcard has a headphone connector onboard - it has 
enough juice to run your phones. The electred microphone can be hacked 
onto the empty microphone footprint. It has a roughly 2v bias voltage 
present and takes signal over the same wire.  IF you need to go deeper 
then that to split bias and signal out separately, I could probably 
advise you - but don't want to take responsibility for and damage 
created if something goes awry.

You can also use a separate 9v battery, however you will probably still 
want to use the microphone footprint on the zero to jack in - because it 
runs through an analogue mixer which has something like 30 dB of gain to 
boost your mic. IF you want to take this approach you would have to 
disconnect the bias voltage from the mic. connector first - so as not to 
have two voltage sources fighting on the same line.

Matt

On 2/3/21 9:40 pm, Christoph Völker via People wrote:
>
> Hello community,
>
> I would like to run Binaural Microphones/Earphones with a raspberry pi:
>
> https://www.roland.com/global/products/cs-10em/
>
> These are stereo condenser microphones built into earphones. The mics 
> need to be amplified by 2V to 10V.
>
> How would you do this? Can I somehow attach a 9-volt battery to the 
> stereo soundcard (http://www.audioinjector.net/rpi-hat)?
>
> Many greetings and thanks,
> Christoph
>
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