How hard of spec limit is the 12V upper limit on this board. Is it +/- 10% or 15% or ?
I need to power it from a 12V wall wart. I’ve seen some put out as much as 15.
That 15V figure is probably when there is nothing connected to it. Once you put a load on it, the voltage drops. You can put more than 12V, but you would need a heatsink on the regulator.
Yes, that’s true a lot of the time. But I have disassembled many a 12Vdc wall wart and most of them have no regulator.
So, it sounds like 12V is the upper limit and it would be better to run it at a lower voltage for longer life, say 9V, to compensate for the variability in wall warts.
When I said that you could put more than 12V, I was talking about the regulator on the Arduino would need a heatsink… And most walwarts have switching circuitry in them.
Yes, that’s what I understood. I have a boat load of old linear wall warts that I thought I would use for an application that is going to take 25 arduino boards each with their own wall wart. I am going to switch to 9V wall warts.