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Re: [TCML] BPS Testing
Until I get that round tuit and scope my cap charging waveform along with NST current, check out this waveform I captured years ago of the .02uF cap voltage on my 15/60 w/ static gap.
There are several instances of multiple lower voltage bangs following a full-voltage bang. It would be interesting to see if airflow through the gap affects this. But my vortex gap in the waveform below does have a lot of airflow.
This is important!!! One thing to notice is that every time that there are several smaller bangs occurring in quick succession, this ALWAYS happens following a point where the cap voltage charges almost to Vgap, but doesn't quite make it, then goes back through zero and soars to Vgap on the other side of zero. I'd bet a Maxwell that the NST is cranking out a lot more current from the previously unspent bang, and with the gap still hot from the initial full-voltage bang, the breakdown voltage is diminished. I definitely need to repeat this while also scoping the charging current.
Regards, Gary Lau
Typical behavior which I have observed both "in person" and in my Electronic Work Bench [simple Spice] simulations assuming constant transformer leakage reactance which isn't very close to the real world. Under some primary voltage and "approach to resonance" of the charging circuits the behavior appears almost chaotic. It's also possible to pick excitation voltages [relatively low] where the circuit "counts down", creating one spark for several primary voltage excursions.
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