Im sorry if this is a dumb question but do I need something like this: https://www.antratek.de/usb-adapter-5v-2a?gclid=COjfvKbIvcsCFQhuGwod7r0DLw
And if I need this one, how do I connect it to my circuit?
Im wondering also why RGB LEDs and common LEDs make a difference in this circuit?