Hello all. Just thought that since i was posting schematics in this thread of a HV design that i would add some of the ignition coil driver and flyback driver circuits that i found in researching Tesla coils. These circuits are good for those wishing to ease their way into playing with high voltage of a lower current first before setting up a neon transformer, oil furnace ignition coil or microwave oven transformer.

Heres a basic 555 timer ignition coil driver circuit. The 1k (from + to pin 2) and 2.2K(from pin2 to pin7) can be subbed for trimmer pots (see next circuit)to allow for adjusting freq and gate I believe. Please note that this circuit illustrates no diode protection for back EMF on to the 555 timer and will very likely burn them out quite quickly.


Still no diode protection in this schematic, however this one features some adjustment pots.


Here is a more elaborate driver circuit that offers protection for the timer circuit.


Here is a audio modulated circuit that will convert the spark gap into a speaker through which music can be played. Have not attempted this circuit yet, but have plans to do so soon


This circuit will be more reliable, transistors in parallel config and phased ignition coils. (note- transistors will be cooler but ign. coils will still get hot)


And of course my favorite ignition coil driver is the bedini self oscillator circuit as it will harvest radiant energy from the bifilar coil back on to a secondary battery bank. To drive the ignition coil simply add a connection from the collector in this schematic to the negative pole on an ignition coil. Sub the 2k resistor for a trimmer pot and you have an adjustable ign. coil driver that will stay perfectly cool. An neon bulb from the emmiter to collector is also a good idea in this circuit as it will save you burning out your pots if secondary becomes disconnected.