STEORN DEMO LIVE & STREAM in Dublin, December 15th, 10 AM

[Omnibus]

I'm back earlier than I planned. Couldn't wait. Of course, the first thing was to check @lumen's suggestion. I did put a 100Ohm resistor where he indicated in the schematic diagram and what I found was that not only the OU effect didn't vanish but it got even slightly higher. So, @lumen's supposition for capacitance of a standing wave and such playing a role is out. Moreover, as I said before, I don't even need the secondary coil. The OU effect is even higher with no load on the secondary side. Thus, that settles the problem posed by @lumen outright.

What I'll do now is try desperately to get a Tektronix TCP0030 current probe (which is on the order of $3000). The good news is that now I need only one such probe. That will provide the ultimate confirmation of the effect I'm presenting, although it seems pretty clear even at this stage that it is real. That's it folks, we got it -- reproducible and open for everyone to do it, as has never been shown before. OU trivially present in most common coils and transformer-type devices.

On the technical side -- I'd like to hear from anyone who has had experience with bifilar coils aiming at eliminating parasitic inductance. What I did today was to destroy one of those wound ceramic RadioShack 0.47Ohm resistors, extract the wire, straighten it and then re-wind it in a bifilar manner. Also, I took one of the RadioShack larger coils, unwound it and wound it back as a bifilar coil with the intention to use it as that so-much discussed current detecting shunt. I did use these two shunts and the results confirm what I reported earlier. Trying to order the shunts from Newark Co. and elsewhere, mentioned earlier, but still haven't received any. The metglas toroid cores I sent to be wound aren't arriving either. So there's this typical waiting period. Will see on Monday how long it will take to get the Tektronix current probe. However, like I said, all signs indicate we're already there. 

[lumen]

@Omnibus
That's interesting, I would have expected a voltage drop at the input at about the same time the frequency reached the point of OU.
You suggest also that the effect still occurs even with both sides of the secondary disconnected?

[Omnibus]

@lumen,

Correct. No need for a secondary coil at all. I observed that earlier, as you can see from my posts several pages back but was still uncertain, attributing it to errors due to parasitic inductance. That problem (parasitic inductance) has haunted me from the get go. Now I'm almost certain that has been a false alarm but to make it go forever I need to see the effect by using a Hall effect current probe. That will eliminate any trace of doubt regarding inductance as the culprit. All in all, the whole thing turned out to be much more interesting than I ever expected.

[Staffman]

@Omnibus

I found a site that says they will rent/lease what you need. I'm not sure how much they are asking, but probably much less than the $3000 for a new one.

http://www.testequity.com/products/1371/

[Omnibus]

@Staffman,

Thanks for the link. I'll probably go for the offer by Test Path Co. They are less expensive and I have already dealt with them (had to return one $1300 Tektronix current probe because it wasn't Hall effect based but was a simple transformer--completely inadequate for the current studies). With the TCP0030 I'm noticing another problem. It only works with DPO3000 and higher and I have a DPO2014. Any suggestions as to how to solve this current probe problem would be welcome.