Hi, I would appreciate some general advice on a power supply question. I have been for some time looking for a power supply that runs off single phase 230vac and is capable of producing a variable output of 30-40Amps at 24vdc. The power supply will power a xenon lamp in a projector. I know such supplies are available but are quite expensive. My question is how difficult would such a supply be to build ? My understanding is that the supply would consist of a transformer , rectification stage and smoothing cap at the output. If the transformer reduces the 230 voltage to 24v , how does it create 30 amps from the 230 13 amp input ? Sorry for the naievity of my questions ! I d be grateful of any help or advice, even if its just to say that if I have to ask the question in the first place then its probably not something I should even consider ! I'm really just interested in how this type of PSU works in practice, is it AC in then transformed then rectifier etc ? Thanks.