Quote from: TinselKoala on May 02, 2017, 09:25:55 AM
To get the actual distributed capacitance you have to work backwards from the resonant frequency and measured inductance. Just separating the two half-coils by disconnecting the centertap link and measuring capacitance between the two halfs doesn't give you the correct distributed capacitance value. SO get the ringing frequency from your scopetest, which is 14.88 kHz (nice and low due to your high inductance of 1.16 mH) and go to the Resonant Frequency Calculator here:
http://www.1728.org/resfreq.htm
and enter the freq and inductance and solve for capacitance. This will be your correct interturn distributed capacitance. If you have the inductance and capacitance values correct that is.


Yes, at the high frequencies being used to see the "effect", inductances of probe connections and other wiring become significant.

Says 71nf.  Was just showing as an example wondering if this coil possibly needs to be operated in the mhz range also.  Just thinking.

Mags

Quote from: Erfinder on May 02, 2017, 09:22:13 AM

I find your devotion to single sine function curious.  You read Tesla's statement and owing to your "conditioning", "automatically" assume" that he is talking about what you think he is talking about.  Why do you people insist on isolating the one from of the many, rather than embracing the many, and applying to them, that which is applied to the one!

Just trying to work with these guys a bit to see the other things that are being looked at. Hopefully we will figure out what you are trying to get us to figure out also.

Mags

Russ Gries his video response #2 to tinman

https://youtu.be/a86D2MPLmpE

get your calculators out!

Thought I'd try isolating both input and output with toroids, hand wound approx 1 to 1.

Setup:
FG hooked directly to primary of first toroid.
Secondary of first toroid hooked to device (to resistor, as though replacing FG in Tinman setup).
Replace output resistor with primary of second toroid, moving output resistor to secondary of that toroid.
Both resistors 150 Ohm metal film (couldn't find any 100 Ohms).
Sine wave (analog BK 4001 FG) input.
Testing at resonance at 304 kHz.

Input voltage drop as measured across input resistor: 0.820 V P-P (820 mV).
Output voltage across resistor at secondary of second toroid: 3.1 V P-P.
FG output voltage: 18.4V P-P.

If I remove the output load resistor:
Voltage drop across input resistor: 6.52V P-P
Voltage at output of secondary of second toroid: 42.0V P-P
FG output voltage: 17.6V P-P.

Note that the voltage across (and current through) input resistor DROPS when the load is applied.  I'm having a hard time understanding this.

Anyone have a theory yet on what's going on?

For those who want to replicate this novel experiment, the hardest part for me was winding that coil.  I took a 10" x 10" piece of aluminum plate (could be steel or glass) and taped down down some paired hookup wire in the center.  Then I started tacking down the pair of wires using a hot glue gun every 30 degrees or so, making a circle, and going out from there.  I would put a blob on the metal and quickly push the pair of wires into it, and keep going.  Took a couple of hours to make it.  At the end I put a lot more hot glue on the outer windings then hit the whole thing with a hot air gun (hair dryer may work, don't know).  Then slid a drywall knife under it to lift it off the aluminum, and put some tape on it to hold it together.

Some folks have talked about grain of wheat bulbs, which I think run at 12V.  I believe that the old incandescent small Christmas tree bulbs may work at a lower voltage (seems like 6V), if you can find some.

Partzman's testing and attempts at replication are interesting and a worthwhile exercise.  However, this is at best indirectly related to the bifilar pancake coil.  Just look at title of his schematic, "Bifilar Pancake Transformer."  It's not a coil, it's a transformer.  I still encourage this discussion on this thread.

The transformer discussion has pretty much hijacked the real purpose of this thread.  I was leaving it up to the contributors to continue the discussion about the Tesla series bifilar pancake coil.  What unique purpose or purposes does it serve?  What is special about it and what can you do with it?  What practical applications are there for it that specifically require a Tesla series bifilar pancake coil?

So is it real or is it just one of millions of patents that were never used in the real world and the only reason it is discussed is because Tesla's name is on it?

The field is wide open and I hope we hear more than crickets chirping.