[Eeglablist] Physical filter Circuits

[Martijn De Neeling]

Hi All,

I am fairly new to BCI and I am trying to make an EEG signal amplifier. I
do not know if this is the correct mailing list for my questions, but I
will ask them anyways. What is the optimal amplifier setup for filtering
out the 50 Hz frequency while keeping good EEG signals? Note: I am
interested in measuring the motoric signals ranging from 7.5 to ~20 Hz.
At the moment I use this setup:

Pulse->electrodes->Industrial amplifier->Notch filer 50 Hz->Low-pass filter
32 Hz->Amplifier with variable gain of 60-440-> another 50 Hz Notch
filter(optional)->AD-converter->computer.

I have read that it is also important to have high pass filters for noise
below 7.5 Hz. Does anyone recommend this? Also, are physical filters good
for pre-filtering the data or is it better to use digital filters?

I hope someone can give me some clear answers on these questions.
Thanks in advance,

Martin
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