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Original circuit from https://www.youtube.com/watch?v=GbMAvn7nRWo
The potentiometer controls the power level with 100% being about 680V peak to peak and 0% being about 1.24kV peak to peak. The circuit will not start if the potentiometer is above 75%, and will be much slower to start if it is much above about 10%.
The 1nF capacitor is not part of the original schematic, but is critical to the functioning of the circuit. I can only assume that this capacitor is supplied by parasitic capacitances in real life. However, the MOSFET's parasitic drain/gate capacitance will not take on the role of the 1nF capacitor, and is in fact detrimental to the operation of the circuit. The MOSFET parasitic capacitance does not prevent oscillation but does make it nearly impossible to get it to begin stably oscillating, even at only 1nF. Fortunately, most of a typical MOSFET's parasitic capacitance is between the gate and source, not the gate and drain.
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