I have a beefy mains transformer from a US made psu. The mains i/p voltages were slider-switch selectable 110/240. As I now only have the xformer not the switches I'd like if possible to know how to wire it up for mains 240 V use.
There are 2 primary winding and I can only measure their DC resistance. There are 5 prim connections altogether:-
Winding 1, A-B measure 3 ohms
Winding 2. C-D-E measure 2.8 and 0.9 respectively.
The slider switches used to hook these two winding in some way for 240V as I know it used to work ok. Should I just go for max resistance, feed in on A and E and just link B-C? It may be the wrong way around of course (ie feed in on A-C and link B-E) :-O Any way to tell beforehand - a pity to destroy it experimenting.
Help! Thanks