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neuroidss / FreeEEG32-beta

as FreeEEG32 plus alpha1.5 test passed, FreeEEG32 project changed to beta version
GNU Affero General Public License v3.0
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Input protection circuit? #3

Open acertain opened 2 years ago

acertain commented 2 years ago

I saw that OpenBCI has an input protection circuit (resistor, ESD protection, and ground capacitor) between the electrodes and the ADC, while you don't seem to? I'm not sure if it is really necessary, but I'd think the extra safety is worthwhile?

Also I ran across https://github.com/VolksEEG/VolksEEG, which is an open source project targeting eventual FDA approval (!), and might be interesting as a source of ideas.

acertain commented 2 years ago

https://openbci.com/forum/index.php?p=/discussion/154/front-end-filtering-esd-cmrr-rfi has some discussion about analog filtering

joshbrew commented 2 years ago

@acertain Didn't see this till today but the AD7771 has ESD built in as is more common these days in ICs. You can zap them all which ways and they hold up.