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alpha (UNTESTED!!) edition of tDCS unit (for entertainment only)
* PampA/PAmpb are connections for in-line 0-5ma ammeter
* Psw1a/Psw1b are for spst power switch
* PSW2a/PSW2hi/PSW2low are for spdt switch for high (2ma) or low (1ma) current flow
* LED is optional, and must be high efficiency or it will drain battery
* Changed R values to produce ~2ma and ~1ma as reflected in physical testing.