How to make a high voltage DC power supply using a flyback transformer that has builtin diodes. Steven Dufresne is calling it the Cube given it's sleek black shape. He'll show how it's made and give demonstrations, including nice wavey corona and a jacob's ladder or travelling arc. No Cockcroft-Walton voltage multipler, or tripler, is needed for this one. The output is around 20 kilovolts before the transistors begin heating up too fast.