Tinman's coil shorting circuit

[penno64]

Trying to get some electronic schematic drawing tool to post my take on it.

[penno64]

My guess -

[gyulasun]

Hi Penno,

In your drawing the gate-source of the MOSFET is biased via the left side stator coil by the DC voltage stored in the puffer capacitor, and if I figure correctly the bias is positive for the gate so that the MOSFET is ON all the time except for any induced peak AC voltages that are able to switch it off by defeating the DC bias. But this is not neccessarily wrong, of course, I think this would also be a possible schematic. 
Did you place (insert) the switch (named as S1 by Brad) into the gate wire where you drew two red squares with the question mark?
The gate-source of the MOSFET should be protected against overvoltage (especially when there is no load across the puffer capacitor) but I think you know that.  I would not consider this drawing a simpler one than I proposed though. 

Gyula

[penno64]

Thanks Gyula.

Using just the components we can see -

[gyulasun]

Hi Penno,

Okay, thanks too. 

When attempting to build, you may wish to consider some further components protecting the gate-source agains overvoltage (this is why I indicated the potmeter and the resistor as simple means.  Brad mentioned the unloaded DC voltage in the puffer capacitor went up to several tens of Volts or higher (cannot recall at the moment correctly), that is too high for the MOSFET gate-source.
Do you happen to have the main components for the setup?

Gyula