From: Martin McCormick <martin.m@suddenlink.net>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Tue, 7 Apr 2020 20:20:55 -0700
Subject: [EE] The Raspberry Pi Power Plug
Thread-Topic: [EE] The Raspberry Pi Power Plug
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After a several-year-old Raspberry Pi didn't come back up after a
power failure, the problem turned out to be the 5-volt switching
supply.

	Adafruit, the company that sells the Pi and supply
matched the part number we supplied and I just got 2 new 2-amp
5-volt supplies today.

	The 2 Raspberry PI's I have both use what I believe to be
a microusb plug for power only.

	The replacement supply is the correct supply but comes
with a round coaxial-style power plug like one sees on a zillion
and 1 gadgets these days.  There are lots of sizes and variations
on the theme but the body of the plug is often-times negative
ground and the center conductor is, in this case, +5 volts DC.

	Being the pack rat that I am, I did save the power cord
off the dead supply so I cut the power cable from the new supply
in half to save the molded coax connector.

	Stripping the bare wires shows a red and black just like
the microusb plug so after splicing the old plug on to the new
cable, the Pi rises high again.

	Do new Raspberry PI's use a different power plug these
days or do they just figure people are smart enough to figure out
they can save the day by saving the old cord and splicing it on to
the new supply.

	In this case, more power means the components in the
supply are probably not straining as hard and therefore are
running cooler.

Martin McCormick
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