OpenEEG
Electrodes

Electrodes are the contacts from the EEG device to the head (brain).

An interesting SMT digitizing electrode design: IMPROVING SIGNAL QUALITY AND TEST RELIABILITY IN EEG
MEASUREMENTS USING INTEGRATED HIGH-DENSITY
SURFACE-MOUNT ELECTRONICS

An interesting paper about accurately recording very low frequency EEG with special electrodes. DC-stable electrode-skin interface for human EEG recordings

What do people think about putting ferrite filters around our electrode cables to suppress H.F. noise, like they do for DC power supplies? I think some of the professional companies are already doing this.

Maybe we can also point the way here to a few well designed hopefully cheap electrodes for sale:

Hair-Mount EEG electrode
spring-clips like a barrette to the root of hair strands .

I’ve just found this one it looks quite nice but not too cheap :
GEREONICS EEG ELECTRODES
Here is a desciption:
Gereonics silver/silver chloride (Ag/Ag Cl) electrodes are made from very finely powdered high purity silver and silver chloride. They are mixed in a specific ratio and compacted into the electrode body at very high pressures. The resulting pellet is relatively thick (0.7 to 1.0mm) and never needs to be rechloridized, because it is a homogenous mixture. This is unlike electrodeposited Ag/Ag Cl which is very thin and needs renewal after multiple uses. The only American standard for electrodes is ANSI EC-2 for “Pregelled EEG Disposable Electrodes.” The electrical performance requirements, test procedures and test circuity are set forth in this standard. Specific electrical tests are AC Impedance, DC Offset Voltage, Combined Offset Instability and Internal Noise, Defibrillation Overload Recovery and Bias Current Tolerance. Gereonics electrodes test very significantly better than the specifications for each of these tests. All Gereonics electrodes are 100% tested for Continuity and DC Offset Voltage.

OpenEEG Electrodes

OpenEEG
Electrodes