Don't know about the circuit. Hopefully someone competent will jump in and verify it won't kill you. But the picture of the Focus device raises the obvious question: how do you position the electrodes precisely? If you read the studies, different positions (over different brain areas) give very different results. (The difference between placing anode vs. cathode over the brain area is night and day.) The Focus looks like it is designed to be plopped onto the head like headphones. Exactly what brain area is being stimulated and on whose head?
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