Hi, I'm new to the thread, I have a few quetsions about TDCS.

9V at how much current? 2ma would be maximum?

Ive heard that you get different results depending on which part of your brain you plug into, I've also heard that US Military as part of experimental testing would test on snipers but would only place 1 node on the head while the other in the arm. Are there benefits to this (Source: Radiolab: 9 volt nirvana)

What does the circuit look like? staight 9v into your head or do you add a resistor or any other component in the circuit?

From what I've read here it seems a very important part are the electrodes. perhaps the most important since 9v batteries are cheap and easy to find, and circuit is simple. That being said would something cheap but with decent electrodes/sponges would be worth buying vs, one of those $200 kits?

Super excited about this, I do hope I get a response.