Memmeddu
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Tbh from my understanding those add on boxes have never been so popular outside the US.A Tesla coil - and a radical outside the box idea
I've still got an old buzz box so I'm very intrigued by this. Lots of functionality for small outlay. Would it work well? There are some previous posts on here...and I just did a Google search for the UK and there's nothing mentioned here - maybe in the EU you're in a stronger position to resource this? I'm following this!
But they are just an inductance a reed switch and an ignition coil with a spark plug acting as HF gap.
Very simple and primitive design they kick in when the current drops to keep the arc lit between positive and negative wave.
There are a lot of plans in the net, and you can arrange other functions like a solenoid valve or a power contactor for the main power supply.
Older transformer Tig welders should have had something similar