I have made a page with details of the coil on my [link=http://home.online.no/~jon-mj/homemade_coil.htm]homepage[/link],
You should find all info you need there.

The CDI is from the design on my web.
It is an open source design, but i have not put the latest version on my page yet.
It has programmable delay, a nice test function, as you see on my cideo clip, and uses no special componens.

Jon-Magne