Amplify 5-100 microvolts to be read by arduino

Hi, I'm trying to amplify 5-100 microvolts from eeg electrodes to a 0 to 1.1 volts for arduino to recognize. any suggestions?

Thanks.

a microvolt is .000001 volts

That's going to require a amplifier gain of like X11,000! Such low level signals require special care in the op-amp selection, design and construction as circuit noise is a real problem at these low levels. Instrumentation op-amps circuits and modules are available as part of the solution. I would search around to see if anyone has published a similar project to work from.

Lefty

so it has to be amplified 10,000 times

would an audio amplifier work? Found this circuit for a 10,000 audio gain, the input would go where the touch plate is.

sorry I got confused, this is not an audio amplifier. the output to arduino would go to the led

That won't work for several reasons. Again find someones project reading eeg probes and work from there. Googled this as a starting and learning step of what is involved and required for handling eeg signals:

http://openeeg.sourceforge.net/doc/modeeg/modeeg_design.html

Lefty

http://openeeg.sourceforge.net/doc/index.html

See the hardware section and do they do it, be careful or you can kill yourself with those things.

thanks, this is not for humans, i'm trying to attach the electrodes to living things like plants and then making music from the signals

thanks, this is not for humans, i'm trying to attach the electrodes to living things like plants and then making music from the signals

Hmm - never realized plants had a CNS...

:-?

but they must have some electrical activity going through them

they must have some electrical activity going through them

Trees do get struck by lightning, it's true...