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Not the traditional big iron type of transformer. They are all switch mode design which is Way more efficient ( no iron loss) and can cope with a range of input voltages. The only transformers they have are either air core or ferrite core ones used as part of the buck/ fly back converter so these are small and cheap and the switching mosfets are also cheap hence the price difference between smps and big iron transformers Best regards Robin Cornelius On 6 Sep 2013, at 09:13, Tom <madtom1999@xxxxxxxxxxxxxx> wrote: > Do the standard pc power supplies have a transformer in them. Just wondering as I > found a 500W job for Â12 and I cant get a 500w transformer for anything like that > Tom te tom te tom > > -- > The Mailing List for the Devon & Cornwall LUG > http://mailman.dclug.org.uk/listinfo/list > FAQ: http://www.dcglug.org.uk/listfaq -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq