I finally made the Tesla coil (Slayer Exciter) video I mentioned in a previous post. If you want to build a mini Tesla coil, diagnose a non-working one, know about modeling circuits in LTSpice, know some electronics principles, or see some electronics nostalgia, this video is for you. In trying to diagnose my Tesla coil, I show ways to test a transistor (and ways to use a transistor for switching), and show how transformers work (even design power supplies), and show some nostalgic things from the past (such as electronics kits). Also, I show variations of this circuit, and I show that this circuit really should work. BTW, I pretty much show (or discuss) just about everything that uses a coil.
It's so jam-packed with stuff / information, it's really 7 or 8 videos in one.