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
opposit 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 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. 