I have see alot of transformers in my day. But the other day a customer brought me in 2 transformers. He has no idea what they are from, if its step-up or step-down, v(in) or V(out). I have tried to search the part numbers on the internet but to no luck. Only one has a brand maked on it (they both have pns). I emailed the one company and they still have not gotten back to me. Any one have any suggestions on where to look?