I had a RPZ(W) working happily with a Blinkt LED strip on it. All working happily.
I made a mistake and updated to BUSTER. (the $hit then hit the fan)
I eventually replaced the Z(W) with a 3B(+) (Not sure about the +)
Booted all sweet. Fan keeping it cool. Not really needed, but as it was already there I left it.
But the LED strip was missing because of mechanical problems between the Z and 3B.
Today I got some jumper leads just to test getting the LED strip working.
Carefully I put the leads and powered it up. Seemed to be ok. A couple of LEDs wouldn’t turn off - or more so: stay turned off.
All looking good (or seemingly) I put it back in place and… (drum roll)
Took it back out checked things.
UNDER VOLTAGE. ARGH!
So I need a RasPi power supply that can supply more current.
The one I have now is 2A. Yes, I know there are “bigger” ones.
But there’s the twist.
There’s a good to fair chance you need more voltage, not more current. It’s likely that little plugpack is not capable of the same standards of line and load regulation as the official Pi supply is because they’re designed for different purposes.
If you want/need to use a power source other than the official one, your safest bet is to assume the official supply specifications are the same as the device requirements (5.1V ± 5% ie. 4.85V - 5.36V for a Pi).
If your supply is dropping below 4.85v (which is actually within the USB specification) you’re likely pushing the limits of what the Pi can operate on.
There’s a good discussion of this issue here:
Sometimes if I need a wider gap on my power board, I find a double adapter like this is quite handy: