N.R.M.R.E. An investigation.

[itsu]

TK,

there was confusion about the direction of that transformer from the start, i expected too that it would be connected to the collector via the secondary (24V) to get a HV (radiant) signal from the primary (240V), but Graham just asked Nelson the other day in this thread:


http://overunity.com/17186/the-bifilar-pancake-coil-at-its-resonant-frequency/msg503543/#msg503543

Hi Graham,
Is the primary side of transformer that is connected ; the transformer i used is 240v x 9v normally  used in a commercial electronic inboard .

wish you the best

Nelson Rocha

So primary (240V) connected to the collector.

Concerning the used 3N247 FWBR, that was what i had laying around, not sure what Nelson used.


Itsu

[AlienGrey]

https://www.youtube.com/watch?v=YoG8wTYa7eU&t=7s
https://www.youtube.com/watch?v=ceAHCQpnqZU
https://www.youtube.com/watch?v=JeIrnndrdnw

My redraw of the circuit

Regards Itsu

[TinselKoala]

Thanks for the clarification. Now I have a couple more questions (of course!)

Does that HV radiant 3n247 still work normally when pulled out of Nelson's circuit and tested within its limits as indicated on the data sheet?

And how does the HV radiant show itself? Corona, sparks, lighting up neons or CFLs, making people feel ill, or just how?

That transformer primary-secondary thing still puzzles me. I'm wondering how the wire insulation withstands the HV stress.

[Dog-One]

When you get something slapped together Tinsel, see if you can replicate then explain this...

You apply a few volts and you will see a typical oscillator, nothing special, drawing a few milliamps as would be expected.

If you slowly increase PSU voltage, you will get to a point (between 7v & 9v) where the circuit behaves much different.  Milliamp draw will go to practically zero; the waveform will go berserk quite literally, voltages on the scope will exceed 10x probe settings or nearly so.


I built this goofy thing about a year ago and still don't comprehend what it is doing or how.  It certainly didn't appear to me to be normal.  Maybe it is.  Hopefully you can get similar results and clue us in.

Whatever Nelson was on to, he chased something most of us wouldn't think to follow.



One other little note:
  Pay particular attention to how the circuit operates when it first goes into "berserk mode", because after just tens of seconds, you will never see this again quite the same.  I think the voltages actually damage the electrolytic capacitors.  However, you cannot substitute these electrolytic capacitors with something of higher voltage rating.  The way they are designed as rolled flat plates is essential to the operation of this circuit, as though their real purpose is some sort of coil instead of capacitor.  Probably why Nelson has been doing extensive research with pancake coils--he knows what he is looking for now.

[TinselKoala]

Hmm... OK, Dog, I'm looking forward to seeing this bad boy on my own bench. My TIP122 Darlingtons are supposed to arrive Thursday, hope they
are genuine and not some recycled rebadged Chinese fakes.

What you've described reminded me of a video I made some time ago with a very simple circuit from TinMan, using a Tesla Bifilar pancake coil.
I posted a link to it when I first made it and I'm kind of reluctant to post it again, what with the flame wars and all, and I don't want to
take this thread off-track.

In your build did you have the transformer and the FWBs installed when you saw the weirdness, or just what you have on the breadboard?