Using 40 low frequency Mics.

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Hi,

I am working on a device that takes input from 40 microphones and send data to PC via Arduino.

I want to use low frequency microphones (5Hz onwards) with around 200-250Hz sampling for each mic.

For this purpose, my preliminary design is like this…

40 Mics → 40 PreAmp circuits → Mux Shield II → Arduino DUE → PC

Please suggest me suitable commercial available preAmp circuits and any suggestion on the design is most welcome.

Thanks.