With two components you can build a variable constant current source very quickly: http://users.telenet.be/davshomepage/current-source.htm

Why would they put 6mA when you are suppose to send 2mA?

9v/6mA is 1500Ohms. If they added a 3k resistor in series with their setup, they would've up the total resistance to 4500Ohms, resulting in 9v/4500Ohms = 2mA of current.

To clarify, we measured about 8000 Ohms of resistance through the head, using our electrodes. For some reason, our measurement was off. I'm assuming it's a problem with the electrodes. To fix this issue, we'd need constant monitoring and adjustable resistance. In no way was I planning on running 6mA through my brain.

I guess you're just braver than me but constant monitoring and adjustable resistance are the barest minimum features needed before I'd even consider running current through my brain.

I'm really glad he did that so I didn't have to. The effects sound pretty cool though.

This whole thing reminds me of Uncle Rico's time machine in Napoleon Dynamite.

http://www.hulu.com/watch/8729/napoleon-dynamite-2004-the-ti...

yikes, be careful!

Hey, I'm curious how you plan to limit current issues through the electrode contact quality. I know when putting on EEG electrodes you can test the impedance, would something like that be needed here?