For use in the 'braindetector' by the 'Spullenmannen' I made a couple of active EEG electrodes which seem to work quite good.

The project uses the open eeg design I used the SMD based design of Radek Panek with some slight modifications.

I used TLC277 opamps which are less noisy (well… very very low noise), and I used a set of palladium coated silver ball contact points by Oxley (farnell ordercode: 145327) in groups of three. With Brainbay and a C3 P3 positioning I could get a reasonable reliable measurement of Alpha activity.

The PCB's have been made using a laser printed sheet layout (mirrored) on transfer foil. Using a very hot iron the pcb layout can be transferred on the copper surface. A waterproof marker has been used to touch-up the spots that were not completely covered. The pcb's have been etched 'au bain marie' in a jam-jar.