[AudioI] People Digest, Vol 14, Issue 1 CS-10EM microphone

[Kenneth Ciszewski]

I looked at the Roland specs for the CS-10EM microphone/headset. It's made for various Roland recorders R-05, R-09HR, R-07.

>From what I can tell the various recorders supply the 2V to 7V (DC voltage) to activate the microphones, which appears to be of the electret or condenser type.

The specs for the RPI-Hat sound card don't say whether the RCA inputs are line level or microphone level, I'm guessing they are line level, which means to use something like the CS-10EM you would need a separate preamp that also supplies the 2V to 7V DC power.

The specs say the microphone's Open Circuit Sensitivity = -40 dB 1V/Pa

which suggests that to get to a 1 Volt level into the audio board, the preamp would need a gain of somewhere around 50-100.

My experience with other audioinjector stereo board (the one with out the volume controls) supports what I have related above. 

If Flatmax would shed some light on the actual audio input specs, which I have not been able to find, we would have a better idea of what needs to be done.
     On Tuesday, March 2, 2021, 06:00:10 AM CST, <people-request at lists.audioinjector.net> wrote:  
 
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Today's Topics:

  1. Pre-Amplifier for stereo condenser microphones (Christoph V?lker)


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Message: 1
Date: Tue, 2 Mar 2021 11:40:25 +0100
From: Christoph V?lker <christoph at herrvoelker.de>
To: people at lists.audioinjector.net
Subject: [AudioI] Pre-Amplifier for stereo condenser microphones
Message-ID: <b85b74bb-56b0-e2d5-bd31-a44c49e8185d at herrvoelker.de>
Content-Type: text/plain; charset=utf-8; format=flowed


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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