[sdiy] Unmarked transformers

[Karl Ekdahl]

Hi, i've got a bunch of unmarked transformers that i
have used doing 220v -> 22v. I don't have a clue if
they're actually designed for 220v input so maybe,
there's a risk of fire or something equally
unpleasant. Question; how do i know how much a
transformer can take? Also, since i'm wondering what
would happend if i plugged this into a 110v outlet, it
just so happends i need to build a +-9v adaptor for
both 220v and 110v input.

Karl