I bought 2 of these power adapters for my 2 raspberry pi's. https://www.adafruit.com/products/501
One of them seems to work okay while the other gives me nothing but problems with my keyboard.
My multimeter shows 4.83 on the bad one and 4.91 on the good one.
The 4.83 is within the range specified for the raspberry pi but again... it is giving me keyboard problems.
Keys are being missed and sometimes it is like a key is stuck in the down position and letters keep repeating themselves.
I'd like to set up a return if I could please.