Kapanadze Cousin - DALLY FREE ENERGY

[Void]

Hi Nick. Yes, when you are using the tesla coil, high voltage may be seen all around the circuit,
including the battery terminals, but the series resonant loop between the yoke core and grenade
should still help to isolate the push pull FETs from the direct high voltage from the tesla coil that
is being induced in the grenade coil windings.

[NickZ]

Nick,

If the resistors are the same as the existing large resistors on your circuit board, then they appear to be wire-wound. If your gate resistors are of this type, then also change these for small carbon or metal oxide type resistors.

   Hoppy:  Here's a picture of both the caps that I'll be installing, as well as the two 56 ohm resistors. No, the resistors are not like the ceramic ones that I have on the TL board and drivers. These types of resistors are unknown to me. They are 56 ohm, 3w.
Maybe you can tell by looking at them if these resistors are carbon, or wire wound ones.

[NickZ]

   Hoppy: I actually ended up using what I think is a smaller carbon type resistor, instead of the ones in the last picture.
   I used a 103M, and a 472M blue 2000v caps together, for 15nf, plus that smaller 56 ohm carbon resistor, for each Fet.
Scope is on the 50v per/div setting. 250v spikes on 12v input.

   Itsu: You certainly are the snubber expert, if there ever was one here. My word...
   Ok, snubbers installed.  Although the scope may show some pretty blurry traces, the snubber signals are clean as a whistle.
Except for those 250v peaks.
   I was using a 12v battery for the input, and 100w bulb as the load.

    I may consider that 250v peak not really that big a peak, just some fluffy static voltage with no real amps behind it, possibly.
I shaded that part of the image so that you can see the faint part of the peak a bit better. Otherwise you can't hardly see it.
    The magic of math...
    Itsu's a wizzard...  but don't tell any one.

[Hoppy]

Nick,

Looks good. If you do find the mosfets breakdown from voltage spikes, fit 150V transorbs (TVS diodes) to clamp the spikes.

[itsu]

Nick,

indeed, looking good.

The spike is to be expected as the collapsing magnetic field needs to go somewhere.

As Hoppy said, you can try to minimize those by using a TVS to keep them below your MOSFETs breaking point.
I used the Oleg snubber as can be seen here: http://overunity.com/12736/kapanadze-cousin-dally-free-energy/msg509360/#msg509360

I think you need to fight that spike as with 24V on the drains it will be exceeding your MOSFETs specs.
Perhaps with 12V you can run it for a longer time to do some resonance tuning as it seems to me the scopeshots are not showing you are in resonance.

Itsu