The important thing to know is that the ModEEG requires shielded electrode cables. Most electrode cables you see for sale online are not shielded.
The cables I (and many others) have made and getting good results comprise of the following:
o 25 feet (for 2ch + DLR) of RG-174 shielded coax cable (a common
cable type available from many electronic suppliers).
o WBT-DSC electrodes from The Electrode Store: www.electrodestore.com/EEG/EEG.lasso?ran=3C2EC848&S=1...
o a handful of Molex .062" male and female connectors (get a bunch as I kept going back to store after I messed up some crimp attempts)
o mini-XLR or RCA to connect cable to your openeeg box. I used the regular (large) XLR balanced microphone connectors from Radio Shack and it seems to work fine.
I also use silver earclip electrodes for when I want to use the ear as
reference (most of the time)
Also - I purchased some male .062" molex connectors and soldered them onto a short lead coming off of the earclip electrodes...that way I can swing from the earclip electrode to plugging in a regular disc electrode for bipolar montage (two electrodes on the scalp). I can post pics of this if this rambling is not making sense.
Here's pics on how to solder the Molex connectors to the shielded
And an older OpenEEG newsgroup thread where this method is discussed:
See my other EEG electrode picture posted here for a better shot of the earclip electrode 'mini-plug' made out of male/female molex and heat shrink.