But the strange thing to me is: 2,5 kHz ?
The Apple charger is 2.3kHz and my PC's USB port is 3kHz in the photos. So 2.5 seemed to be in the middle? What do you suppose it
should be?
This says "typically 50 kHz – 1 MHz" but that would mean they're all 3 waaaaay off? I assume it's an error in my measuring method then?
I just hooked up the ground lead to the black USB wire and the probe to the red USB wire (incidentally, this is a no-data USB cable, so no white/green wires, just power). And I did that kind-if mid wire... So I guess there's (part of) my mistake? It was just easiest to do this way without having to open (and most likely destroy) these chargers. They seem to be 'sonic welded' shut.