So how do I use a transformer in this app? This basic rectifying circuit is just my stand at an example to ask questions on. Case in point, I'm not sure what to do about the power source to make it start working after setting it to be ac as far as I can see, but it also has a DC aspect to the settings. Clearly I don't have an understanding on how to use transformers or power source miss id potentially. Can you provide a shove in the right direction anyone? Thanks!