electric fence generator: concept review

dr pepper said:

I remember a very old electric fence that had an adjustable spark gap, you altered the gap which controlled the max voltage, as the gap jumped when it reached ionization voltage.

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crutschow said:

Well that's certainly an effective way to minimize the maximum voltage.
It's probably a good idea to do that with a ignition coil anyway, since it overstress the coil insulation if the output is open circuit and it doesn't have a gap to jump.

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