Hi everyone, in first place, sorry for my bad english , i didn´t took any class, i learned by myself on the internet.
Well, here it comes: i have a TR8040 (toroidal transformer ) velleman.eu/products/view/?id=345550
It says the red to yellow its 25v ac and the blue to grey is 25v too, when it was plugged on a amplifier board,i measured the different terminals trying to get 50v wich occured with the blue and yellow, but once i umplugged it from the board, i measured continuity between these two cables and nothing happened, and once in plugged only the wall ouput, nothing again, so i supose the 2 secondarys are touching in the amplified board, but i measure continuity in the terminals where you plug the toroidal and nothing happens again , so i know the 2 secondarys touch somewhere, but i dont know how to connect them to get the 50v i want for a regulable powr supply.
The other question is that someone said once to me that va is not the same as Watts, but is very close, so it says 100va and i need to know the real maximum amps to put an adequate fuse.
Thankyou all.