So do US wallwarts have three core cable and a three pin plug connecting you the device being powered? I doubt it.No center tap on a wall power pack?
It must be a UK thing. I have taken dozens of them apart for specialty projects and I would confidently say at least 3/4 of them have center taps around here.
I learned something new too!
This is the way you've to go for a dual supply.![]()
It seems simple enough