How to step-up or step-down ac supply? All Questions › Category: Power Electronics › How to step-up or step-down ac supply? 0 Vote Up Vote Down CS Electrical And Electronics Staff asked 4 years ago I need short information. 1 Answers 0 Vote Up Vote Down CS Electrical And Electronics Staff answered 4 years ago We all know that we can step-up or step-down ac supply by using a transformer. We can also do it by using cycloconverter.