Hi all,
Fist of all thanks to Charlie for sharing the anomolly that he has
discovered.

I have built the first section of the sebcar unit and I am in the
tuning stage. I have discovered thru some trial and error that
manny "sweet" tuning spots exist. I have not used to 330/22 ohm
divider. What I have is a 330 ohm in series with the base/trigger
coil then a 4.7k pot Between the batt positive and the trigger coil.
This eliminates the constant load the the divider network creates.
Obviously different wound coils will respond differenty so
experimenting with the trigger tuning circuit seems the go. Its fun
any way!

The most interesting observation so far is that the effect that we
are tuning for is exactly what we would normally be using "sound
engineering practices" to elliminate! These "dirty" transients will
ruin any good "engineers" calculations.

For those who say that "this is impossibe", your sound engineering
knowledge agrees with you. But you have never been trained to create
random, uncontrollabe noise...we have been taught to shunt this stuff
away....It may be fun to examine what we have been taught to
attenuate!
This process is similar to a posting some time ago about the minuite
man missile power supply.

I have driven it with a function generator but it seems that there
needs to be a kind of in phase positive feedback for the raspy tuning
points to show up. In other words the trigger circuit seems to depend
on being in resonance with the output..... still early days though.

Some of the posts here can appear misleading when refering to other
circuits..we should all try to stick to this trifilar wound coil and
keep the focous on sebcar 1
Im going back to the shed for some more squeaking and tweaking.
Lindsay Mannix