Breadboard power supply 5v or 3 3v rvfm eb03 ps this b rvfm breadboard power supply b provides both 3 3 and 5v dc to suit all popular microcontrollers such as the arduino the board will accept 6 5 to 12v dc input it provides two regulated outputs which can be jumper selected to be 3 3v 5v or off there is a usb a socket so that the device is ideal for powering development boards such as the arduino there are two sets of header pins which plug into the breadboard allowing you to minimis