I built this 12 volt busybox as a science project about 1990. My scratch built
electric motor serves to trigger a Duraspark electronic ignition. Two coils phased
opposite supply spark to power a 2 foot tall Jacobs ladder and neon lite, active
plasma globe, plus various other features.
Tesla coils seem to have a mind of thier own. This example was built by the author
around 1992. Powered by a 15k neon transformer, the plasma ball on top can be adjusted
with a vacuum pump. The neon filled bulb glows bright orange and emits brilliant
sprays of crackling violet light. Rows of 12''square glass plates lined with aluminum
foil handle capacitance.
A simple ''Jacobs ladder'' was made from
the same type transformer as my Tesla Coil.