I am looking to make (Unless there is a nice cheap solution) a variable power supply, which I can plug into my mains (230v) and have a chosen output (230-0 both AC and dc). I also hope to integrate the Arduino into the project, by using it to project an lcd display. i am currently completely in the dark about methods used to step down/up voltage (besides basic knowledge of transformers, how they work). I am asking whether this has been done here before? If so can anyone refer me?
If not I look forward to any reply and suggestion on this project (please try to post sufficient detail as to keep me ffrom replying several times )