I built a transformer once, for some high-school project, and while it wasn't anywhere near the quality of the commercial ones, it worked. It's actually not tha

I built a transformer once, for some high-school project, and while it wasn't anywhere near the quality of the commercial ones, it worked. It's actually not that hard if you have the right tools and a basic design that you can copy - it just takes some precision and patience. I definitely encourage you to try it sometimes if you're interested in electronics...