I found it at the end of a power chord.
It's a ferrite thing, I've got one - it was on a cable at some point. Yeah, give it a go. L
How about if my ferrite is big? should I make more turns??
. It's not actually a toroid (donut) (check the first two links here), but it does appear to be ferrite. It probably won't work as well as a toroid, but it should work.
I just solderd it together tonight and it worked thanks.