I am powering breadboard supply using a 2.1mm DC power cable that is plugged into a wall through a USB power adapter.
This may be a newbie question (since I am one for electronics) : I do not understand why I would strictly need <=6volt if the breadboard supply outputs 3.3/5volt ?
Looking at the specs I believe that I would not be able to power it with <=6.5v since these are the specs : "Input voltage: 6.5-9v (DC) via 5.5mm x 2.1mm plug"