6watts and 8 liters HHO per minute...........

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yes, i still cannot let it go.....

Here are two schematics that are additional to eachother.
I think that the toroid is getting its voltage of two ignitioncoils.
Then you get the tesla coil and the rest...

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Nobody?

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Nobody?

That's an amazing circuit, in it's simplicity.  Thanks for posting it; I guarantee I'm going to use it for something.  And I have spent some amount of time wondering how to wire up anti-parallel transformers.  What's the advantage of doing that?  EMI filter, so the MOSFET can keep it's smoke?

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You simply create double the voltage.
With 20kv coils you get 40kv....
In the case of a Meyer, i might even decouple the secondairys, so you have a totally isolated secondairy circuit.
I know it is possible, but you have yo open the coil casings...
Its a bit of tinkering..

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Moving ahead with this circuit, I ordered a hand full of N channel semiconductors.  The ones my supplier had on sale are 200 V @ 20 Amps.  So I may try paralleling 2 or 3.  Or I can try using a current limiting capacitor on the input to the coils.  Or even use a single ignition coil.

Also, a MOT takes quite a bit less than 20 Amps, so I can use the circuit to provide a high frequency environment for the Radiant Energy spark circuit I recently posted.

And I have opened an ignition coil casing before, to remove the core.  The hard part was keeping it from leaking afterwards.

And, of course, I always have a variety of other projects I can work on while I'm waiting for the shipment.