Re: Active electrodes

Note:  There is a problem with using a soundcard for reading EEG's.
Most commercial soundcards will have a high-pass filter on the input
(somewhere below 20Hz), and you will have reduced low-frequency data.

So, before you get started, if you already have the soundcard, do some
tests with a low-frequency signal input and check the characteristics.

Others have implemented a work around by modulating the frequencies
into a higher band, and then converting back to the original
frequencies in software.  This is quite a lot of work, and I wouldn't
recommend it (you could possibly exceed the cost of buying an existing
solution while trying to build this yourself, and at the expense of
your time).





On Sun, Jun 28, 2015 at 10:19 PM, wikitronic <[email protected]> wrote:
> Hi,
>
> Glad to see more posts coming from this group! The project I'm working on is
> here.
>
> https://github.com/logical/telepathy
>
> If anybody is curious. It's nothing special.It is still a prototype so I
> update it whenever the design changes.
>
> My question is where can I find active electrodes? I want dry electrodes and
> I think some amplification would be an improvement. So I was looking at the
> openeeg site and all the designs are through hole. I was hoping for a quick
> pcb design. I have a nice kit full of surface mount parts so I probably have
> most of what I need. Any open source designs like this?
>
>
> Thanks
>
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