I read a patent which said that Meyer's system is too technically difficult to be practical , due to frequently changing parameters. "Therefor", the patent said, "all that is needed is Tesla's bifilar pancake coil and a spark gap."
It'a been shown that Tesla's coil can have two discrete layers and still function accordingly. All the nXA coils are is just a linear extension of Tesla's concept. So the provided circuit should work, under the patent or not.
But I agree that the important part is what we do with the gas. Meyer pumped all of the thermal electrons out of the gas, then kept using the applied electrical vibrations to continue heating the oxygen nuclei. When these particles get hot enough, an electron or two can be knocked out of the nucleus by an impact, causing a transmutation producing Freon or Helium, and a considerable amount of heat.
No matter how we get the hho, we need to pump thermal electrons. I'm going to start with my T-spark electrodes, two of which melted on the end, pulling thermal electrons from the third, much cooler wire. (This was at 500 miliamps, which is less than one Amp of normal heating current.)