Power connector for the Arduino


Site Moderator
Staff member
Will the red (positive) be soldered from the inside? As far as I can see the black (negative) is soldered from the outside.
Yes, the center of a barrel connector is the positive and the outside is negative. Also the barrel connector is the hot side (supply’s the power)


Elite member
Not 100% sure what the question is. As described in the linked video the red positive wire is soldered to the center tab and the black negative wire is soldered to the outer tab. Doesn't matter where on the tab you solder. Just be sure to wrap the tabs in electricians tape to make sure they don't short against each other.