Markus Robert Kessler  wrote:
>
> Well, since it is hard to find a PSU with exactly 5.2 .. 5.3 Volts to
> make RPi3 happy -- what about using a normal stable 7.5 Volts power
> supply?
>

Before you do anything else, buy a voltmeter and check the voltage
on the Pi's GPIO interface. Pins 2 and 4 (end nearest microSD slot,
side opposite HDMI) are the 5 volt bus, ground can be found at pin
39 (diagonally opposite on GPIO).

The pins are small and easily cross-shorted with typical test probes.
It's wise to de-power the Pi, make the connections and then re-connect
to test voltage. If you've got old motherboard connectors lying around
you can probably extract pin sockets and wires to make test pigtails.

IIUC, the 5 volt bus isn't internally regulated, but the 3.3 volt bus
is derived from 5 volt by series regulation.

> Will this make the power regulator melt down?
>

I believe 7.5 volts will fry the Pi 8-) if I'm wrong surely
somebody will correct me.

Making it easy to verify the Pi's supply voltage will come in
handy when you report problems to others. One of the first questions
I get when seeking advice with a problem is "What's the supply
voltage?".

HTH,

bob prohaska

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