The green LED indicates the presence of power, and an on/off latching switch is used to control the power to the board. Push the switch in to energize the output pins.The input voltage through the barrel socket must be between6.5 V and 12 V. This is a non adjustable fixed power supply, which is good for most prototype applications.Jumper pins are utilized for selecting the voltage levels on each side of the breadboard power rails. You can choose between 5 V, off, and 3.3 V. There are two sets of jumper selectors for each and every side of the breadboard power rails. You can use any combination of voltages on either rail. There are also header pins for tapping off voltages, using a cable or jumper wires.
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