Using an MB-102 Breadboard Power Supply Module
The MB-102 breadboard power supply module is a cheap and convenient way to provide either 3.3V or 5V for your breadboard projects.
The module requires a DC supply voltage of between 6.5V and 12V, which can be provided via a 2.1 mm barrel connector.
By using the various pins on the module and the USB output port, up to seven circuits can be powered directly from the module at the same time.