Need help with eeg circuit

Hi,


I am designing an open source bluetooth eeg circuit. the project is at
https://github.com/logical/telepathy . I have the design on a breadboard
and it seems to be working. In order to do further testing I need to order
some PCB's. I based the design on the dual channel fm sound card eeg
circuit. I have added a analog multiplexer to the input to get 4 channels
into 1 amplifier. The board is pretty small at 1.5"x2" and that's with the
biggest size surface mount packages. I have questions about the design
though because I don't see any low pass filtering.

So I would like to ask if someone could do me a favor and check my kicad
schematic on github in order to avoid having to redesign and reorder
prototype PCB's.

The design is free and I even wrote some of the software for linux.

Thanks :)

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