homebrew eeg

i came across this project today. looks pretty cool, especially when combined with brainwave synchronization with binaural beats. i would need to make some electrodes, but they have designs for both passive (saltwater) electrodes and fairly simple active ones. i could probably get silver wire from a jewelry supplier. EDIT: i think active electrodes are the way to go. the links here to joe's, jim's, and pedro's (the other 2 links to bioera.net are dead) show schematics and construction tips. jim and pedro use joerg's modification of jarek's original v2 prototype. looks like joerg made the following changes. 1. added a 200 ohm decoupling resistor between the opamp and the shield 2. changed the power bypass cap from 100nF to 10nF 3. added what looks like a lowpass with 2 100pF caps and a 10k ohm resistor 4. added 100 ohm power protection resistor to power supply 5. added a 2v 'vgnd' for bias current electrode