tDCS - enclosure and electrode

My own design.
This DIY tDCS works with a 9v battery.

about tDCS: http://www.radiolab.org/story/9-volt-nirvana/

-M3 screws 40mm x2.
-M3 nuts x2.
-banana connectors x3 (generally you only need 2, but in case of multi electrodes use I put 3 holes).
-cables with banana plugs for the electrodes.
-300ohm pot (can be quite hard to find...)
-3mm LED (5mm should also fit).
-about 10 or 15 ohm resistor x1
-a resistor for the LED (1kohm should be fine with any kind of 3mmLED)
-5ma amp meter