Arduino Uno 3.3V regulator ain't regulating with Vin of +15Vdc

Using Arduino IDE 1.x
6

Wow, Interesting question, here..

Try to find someone with an adjustable power supply and see if there's a "break point"??

Hope this is not a just-uncovered UNO problem. :roll_eyes:

AND: WhatIf there's a LOT of AC ripple on the walwart?? Try reading AC volts as well. What do you see??

Hmmm....