![]() Simple, isn’t it? Mains with light dimmer in series, potentiometer regulates SCR’s conduction angle two run capacitors (for current limiting) and two ignition coils in out of phase. But what high voltage experimenter has a GFCI installed in? It would drive him nuts. The only way how to get HV against ground from this setup is to drive only one coil, making sure that your second primary connection (the one which is connected to HV secondary) is always earthed.Īnd this is where I start to like my two-conductor TN-C wiring □ For those unlucky ones with a TN-S (separated neutral and PE), or even with ground fault circuit interrupters, this might not be possible at all without using an external insulation 1:1 mains transformer, since you cannot draw current between live and PE. Since the high voltage return output is always connected to the primary, driving two coils this way presents a drawback: the whole circuit, including HV outputs, is on mains potential. To chop the waveform I’ve chosen a thyristor (SCR) instead of the TRIAC, as we don’t need full-wave control, it’d introduce more stress on the coils. My approach how to drive these two (came from a SKODA 120) was in anti-parallel through a mains sine-wave chopper, like a light dimmer, similar to my triac phase regulator circuit. For experimentation however, I recommend the former type. Most ignition coils as of today are way smaller, since these are driven through your car’s electronic ignition system. This setup is then submerged in oil, or dipped in any similar insulation material, like asphalt or concrete – and hermetically sealed. Any ignition coil is basically a special iron-cored transformer with an open magnetic loop and a high sec/pri turns ratio, with its HV return pin permanently connected to the primary. Now, whether you have the old one or today’s modern coils, the principle stays the same. ![]()
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December 2022
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