thank you for the advice. It sounds like I need a dc supply connected to a vfd that has it's positive output wired to one nail and the other nail wired to the negative. The tips of the nails very close together. That should give me a spark gap that will allow me to control the frequency... right?
I just spent $103 on a vc2002 sg that I thought would work. I need to make sure before I buy a dc supply and a vfd... I have the nails.