[arm-allstar] Power supply requirements

[Doug Crompton]

It is important to note that especially the Pi 3B+ requires a minimum of a
2.5A power supply. Many of the problems experienced with the Pi in general
are power supply related. Running a Pi on a charger type supply is NOT a
good idea. If you use a wall wart get a 2.5A or 3A supply and a minimum of
2A for a Pi2.  The problem is not the steady current but rather the dynamic
change in current that can occur. In order to see this you really need to
look at the supply voltage on a digital scope. The 3B+ in particular has a
faster clocked CPU and dual band wireless which both add to the peak
current that can be drawn. The kernel will report under voltage and if you
see this it is your key to checking your power supply but depending on the
nature of the current peak it may not always trigger the sense circuit so
even if you do not get a warning the power supply when having flaky
problems is the first thing to consider.


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*