tDCS .. electric brain stimulation
this is an open-source tDCS .. Kickstarter rejected them, but they shared the design and schematic so we can build our own.
http://flowstateengaged.com/
http://flowstateengaged.com/
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@cypan i use nootropics for better concentration for reading new knowledge and for skills improvement.. actually i use modafinil and piracetam
also, if you manufacture it, i'm interested...
I tried taking a DC nerve stimulator with sponges to attempt this. Either my placement was bad or it just won't work as needed. It went up to DC 1.87mA when using 100hz... Still just made my face pull/twitch when I had sponges above left eye and one on right temple.
http://sourceforge.net/p/openbrainstim/blog/2012/05/super-fun-ac-adventure-build/
http://brmlab.cz/project/brain_hacking/tdcs
I wouldn't recommend the hacky device suggested in that page, but besides the horrible spelling, the page does contain a lot of useful research on current density, which will help in preparing electrodes.
Besides that, JoVE provides very useful information on how to use a tDCS device properly, too:
http://www.jove.com/video/2744/electrode-positioning-and-montage-in-transcranial-direct-current-stimulation
As for suggestions for the circuit design, are you familiar with HD-tDCS? It uses smaller electrodes (with a correspondingly lower current) to have a more focused effect on the cortex, and it uses multiple electrodes to stimulate different brain regions simultaneously. I don't know what it would entail engineering-wise, but perhaps you could look into it.
As far as electrode materials go, I managed to find some conductive polyurethane foam sheets at Fry's. I had to drive to a distant location to get it, online may be better. But be selective, most websites I came across sell anti-static foam, which I believe is a bit different from conductive foam.
Pretty much grinding, right there. Well played, sir!