davidsrsb
pfm Member
A very good diagram, making the potential errors clearAlso, something that wasn't obvious to me, but if you have a loop through the transformer via the mounting hardware (e.g. bolt touching case bottom and also contacting something metallic up top) then you can have a big surprise. Here's some diagrams:
I'm not sure how this could cause what was observed above but I guess if PSU ground touched the toroid mounting hardware something like this could happen.