EEG in

[Rene Schmitz]

At 15:14 09.09.98 -0400, you wrote:
>Late late last night, I was thinking once again of devious new ways to
>interface myself to my synths, when it occurred to me: A mini-EEG!

>Has anyone done experiments with this type of thing?  I imagine it'd be
>possible to DIY..  skin electrode to hi-gain low-noise amp, lopass filter
>at about 40 hz to reduce hum and noise and other signals not from the
>brain...
>
>Has anyone done anything remotely similar to this DIY?  I need a starting
>point...
>
>		--kh/ev--
>

There has been an elektor circuit which does exactly what you want. It's
just a few quad opamps,
and does level isolate the parts of the circuit who are in contact with the
body!! I think I could probably redraw it and post it on my website, if
someone is interested.
(If I remember it right its amplification was 1uV input for 1V output.)

Bye 
 Rene