Hi I'm thinking about building this PSU but I want to make a dual supply that I can switch to 0-60V but I'm a little confused on what kind of transformer I should use. I have read that you can make a dual output using seperate windings, i'm not sure how to hook up the secondary windings. I know that they would each need there own rectifier, filter capiciter ect.. Hammond makes a 60V center tap transformer that is in my price range (model 182R30) Can I use this transformer to achieve a dual supply? If not, what kind of transformer could I use? (specs would help) I'm hoping to keep it as a single transformer rather then two completely seperate transformers. In addition if I cant use the Transformer I mentioned above for a dual supply, how about a Bipolor supply using the center tap as a common ground? This would be for the improved 0-5A 0-30V PSU Thanks in advance, Trigger