How can I safely power my Arduino MEGA 2560 and have it run programs without being connected to my computer? If I am actually able to do so I assume that means it needs a new external power source, how do I go about connecting it to a new external power source?

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    you can use a phone charger – Juraj Jan 15 at 10:31

3 different ways to power the Mega2560 besides connecting to a PC:

7.5V to 12V 'wallwart' supplying DC to the barrel jack.

5V wallwart connected to the USB port.

5V wallwart connected to the 5V/Gnd pins on the Power header.

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