WARNING AND DISCLAIMER: Working with high voltages can cause serious injury or death. You may read the following project description for entertainment only, which is the intended purpose.
I confess: I am a techie at heart. I've been using a soldering iron since I was a small child, worked in electronics in the military and as a field engineer in industry for many years, and have built and tweaked subs, preamps, speakers, and other components. The first thing I do after a new component is out of the box is to "pop the hood" and visually check it out.
Here, then, are projects that you might find interesting.