Neutral spike and ferroresonance

Body

Have been experimenting with a hard switching 555 circuit at low
frequencies 1000 hz and under 555 to a comparator for pulse width
control and gate driver hard switching a fet with around a 40 nansec
rise/fall driving an ignition coil.

When the proper frequency/duty cycle are hit on the spark is jumping
from earth ground to the device.  It seems these displays are in
ferroresonant zones of the inductor as the loose coupled scope shows the
pulses along with a moving beat frequency, so the typical AM-FM  ferro
response. 

When the proper frequency/DutyCyc are hit upon the spark begins to get
very loud and growl reminding me of angry arcing hi current voltage like
when striking an arc welder.  Something natural instincts scream stay
far away from.

After looking at the Don Smith device and Tesla Magnifying Transmitter
they look like the same circuit. 

I am convinced the Don Smith system works with Norms neutral spike and
on a AC modulated DC signal creating a beat frequency somewhat locked to
the pulse frequency just modulating back and forth.

I have not yet been able to see the spike on a scope channel as Norm
claims it is the reciprocal of the E vector wave.  Working on ideas to
harvest the occurrence without getting bitten or chewed up and spit out.

Leaning towards a gas tube  and inductor like Dr Tesla used.  If one
will notice on the Don Smith device there is a resistor loading the
isolation transformer, this may be what is required in order to correct
the power factor of this bizarre beast.

Also to note when these combinations make the magic electronics do not
like it, power supply LED displays go into havoc and scope looks unhappy
too, have to move further from the bench.