Most basic solution to power Arduino from 100V + supply


Joined Nov 4, 2013
Just opened up an ACtoDC 5V @ 250mA power supply. It seems to use a transformer not a switching DC-to-DC
Go find one of those 5 volt 1+ amp mini cube units (Roughly 1 inch cube) that have the built in USB port for charging phones and stuff. Those are typically all SMPS based units.

Problem solved.