Hello, I was going to try building an old Tesla "Pancake" Coil, and then write an instructable for it. (please don't steal my idea!) Does anyone have any information or building techniques at all that they can give me to help? The Pancake coil is just a Tesla Coil that has a flat secondary, as well as a flat primary. Tesla used it in his early radio and wireless power transmission research. The primary circuit should be pretty much the same as a conventional Tesla Coil. But I am a bit confused as to how to build the secondary. A few questions I have: What wire gauge should I use (I'm pretty sure that Tesla didn't use magnet wire for this)? How do I determine the space in between the turns? (more to come) I realize that most people don't build these kinds of coils anymore, and therefore most people probably won't be able to answer my questions or give me any info; I'd just thought that I would try and see if any one could. It would help me a lot. Thank you.