Originally Posted by
EDDT
1.
My wall charger (iPhone, Laptop) says it would accept 50-60Hz.
I have never found a problem with using them on any plane outlet though. Cockpit, Galley, Lavatory.
Why is it that way? Does it not matter if it's 50, 400 or 10000 Hz ?
2.
Are the shaving outlets in the Lav any different?
Because old shavers used to run a little faster in the USA (60Hz) than back home in Germany (50Hz).
Most modern 'wall warts' use high frequency switching supplies, in these the first step is to convert the incoming power to DC. That is why they work just fine at 400.
As to shavers, good question. I believe old shaver did not use a motor as such, just a coil wiggling a metal armature that moved the blades so would would run -much- faster at 400hz.