Re: [PLUG] Old Raspberry Pi Max Input Supply Voltage

["Rich Mingin \(PLUG\) via plug" <plug@lists.phillylinux.org>]

If you put 7V into the GPIO inputs, you will have a warm Pi for a few
hundredths of a second, and then no Raspberry Pi at all. The GPIO
power inputs are *not* regulated and are *very* sensitive, they want
5V input. Not 7V, not 5.5V, not even 5.1V. I popped the VRMs on a lot
of early Pis by powering them via GPIO.

I *think* cooking the inputs via GPIO will also perma-brick the Pi,
since you'd be killing components further inboard than the usual
micro-USB input, which feeds a regulator, which then feeds into where
the GPIO pins tie in.

I looked for some documentation to support, and the only things I
found said to supply 5V to GPIO, never more, and design your power
hats to fail *low*, since failing high will cause board death. Sorry I
don't have more supporting information to cite.

On Sat, Dec 9, 2023 at 5:32 PM Casey Bralla via plug
<plug@lists.phillylinux.org> wrote:
>
> I've got an _OLD_ Model A Raspberry PI (the second model produced, which
> was a cost-down version of the first Model B).
>
> I'm using a 3" NTSC video display board with it that accepts the old
> composite video, but I've got a power problem.
>
> The video display requires 6-12 volts, but the PI asks for 5 +/- .25V.
> I've run this combo using 2 wall warts, but I'd much rather use a single
> supply.  My thought was to power the old PI via the GPIO pins with a
> single 7-volt wall wart I've got lying around.
>
> Do you think this would fry the Pi?  I expect that it will only make the
> Pi run a little warmer than normal, but would appreciate some electrical
> engineering advice here.
>
> TIA!
>
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