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Music servers and other computer based digital audio technologies.

RE: Being one who

From what I saw in the schematic the RPi takes in regulated 5VDC to power some components but the others are powered by additional regulators that take the 5VDC and regulate it down to 1.8V, 2.5V, and 3.3V. So there are three onboard regulators.

This is a partial schematic from an older RPi but I suspect the newer ones also require multiple voltages.



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