Are planning to design your own QR flyback? This Quasi Resonant Flyback Design Tool will help you do the job effortlessly. All you need to do is to download the tool on the lowest part of this page. Also ensure that you have Mathcad 14 on your PC to open the file. Try search online if lower versions or higher versions of Mathcad can read Mathcad 14 if you don’t have the 14 version. Below are the top-level explanations to every step on this quasi resonant flyback design tool