This is the finished project. As well as being the size and shape of a house brick, it used to be the same weight as one too. It ran hot, and it's risky to depend on a supply that's decades old. I'm sure that the credit goes to Neil at Retro Man Cave . I'm pretty sure I saw this upgrade in one of his videos and then discussed it with him, although I can't find the exact video now. Ms Mad Lemon has also done the same thing , so credit to her too. I have three Amiga PSUs and they're all different shapes and sizes. This is my largest one, and it's the one that is the right size for the Mean Well power supply which is recommended for this project. Further below is a shot showing the part number. It happens to have +5v, -12v and +12v out ,which is exactly what the Amiga needs. It also fits this case snugly. Almost as if it were designed for this job! I bought the new supply a year ago, but couldn't get into that plastic case. The screws are a...