The bifilar pancake coil at its resonant frequency

[TinselKoala]

Well,guess i am going to have to wind a couple of pancake coils now-1x mono,and 1x bifiler.

They can be a real bitch to wind. I just made a matching monofilar coil to the two bifilars that I posted a picture of earlier, #27 wire filling one side of a CD-ROM. It took about 2 hours of solid concentration with no breaks possible. Trying to do it with #33 magnet wire would be nearly impossible for a mortal human being.
But of course the finer the wire: the longer, the more DC resistance, the more inductance, the more distributed capacitance, the easier it is to test and examine claims.
Good luck and I'm looking forward to seeing your testing. I'll be posting another video myself soon.

All the caps i have pulled apart,have the input taps at the center of the rolls of plates,and so,the current will flow CW around half the windings of each plate,and CCW around the other half of each plate. This would cancel out any magnetic field--maybe that is why they make them like that.


Brad

Yes, considerable effort goes into making capacitors as non-inductive as possible. Think about the tiny capacitors and inductors in a cellphone! Operating at several gigaHz frequencies, even the inductance of a short straight trace on the printed circuit board is significant.

[Magluvin]

Whaaat? If we ignore the delay of current build, the current should max out instantly? Whaaaaat? If you ignore the coffee that is in the pot, then there is no coffee in the pot?

Where did I ever agree to that? Link or quotation please.

Nothing happens instantly.

I was referring to your reply to my post about resistance on that and you said "exactly Mags"  Ill look it up if need be.

On what you quoted me on above, Im just relaying what Tesla says in the pat on electromagnets.  The inductance is ignored by the input and the only current limiting factor over time is the coils resistance. So it was the resistance part that you agreed with me on that the currents through a non inductive resistor has no delay in reaching max current V/R. Soo, if Teslas claim is correct then if we pulse the bifi coil, the only thing the input sees is the resistance and if the current reaches max instantly then what of the magnetic field it generated?  Its a short read. So why not investigate THAT claim? 

Mags

[Zephir]

Lawrence has made many claims that have turned out not to be true. Remember the "overunity Joule Thief" fiasco?

Until you have no theory, then any attempt for replication of overunity devices is just naive Cargo Cult "science". In this thread we can see it with example of attempt for replication of Nelson's Rocha parametric circuit. 'This circuit is basically normal Joule-Thief, i.e. very classical Armstrong oscillator in essence. But simple change of single wire placement will change it into way more complex parametric oscillator with potential overunity capability. You can't get this detail just from plain circuit scheme. Maybe even the constructors of first Joule Thief overunity circuits weren't aware of this option - so that they failed in replications of their own prototypes. The same troubles did follow the early attempts for replication of cold fusion and another findings, which has lead into their premature dismissal.

[MileHigh]

Conrad's work is instructive in many ways. But for the best increase in distributed capacitance the adjacent conductors of the windings need to be as close together as possible,without shorting due to the high voltage differences.
SO using heavy plastic-insulated wire is not going to give as much interturn capacitance as will enamel-coated magnet wire closely wound, all other things being equal.

Yes, a very good point about Conrad's setup having low capacitance considering the wire he was using.  What's great about his two clips is the way he excites the coil and makes the measurements.

So presumably you will have more capacitance with finer enamel-coated wire, with the trade-off being more resistance and less maximum inter-filar voltage.

My challenge to anyone is to then crunch the numbers and determine the estimated continuous burn-off power to sustain a self-resonant cavity of X microjoules.  Then draw your own conclusions about that.  And of course the continuous challenge is to state what the series bifilar coil does for us and what practical applications can you do with it.  Just staring at a sine wave on your oscilloscope is useless in the real world.

[Magluvin]

They can be a real bitch to wind. I just made a matching monofilar coil to the two bifilars that I posted a picture of earlier, #27 wire filling one side of a CD-ROM. It took about 2 hours of solid concentration with no breaks possible. Trying to do it with #33 magnet wire would be nearly impossible for a mortal human being.
But of course the finer the wire: the longer, the more DC resistance, the more inductance, the more distributed capacitance, the easier it is to test and examine claims.
Good luck and I'm looking forward to seeing your testing. I'll be posting another video myself soon.

Yes, considerable effort goes into making capacitors as non-inductive as possible. Think about the tiny capacitors and inductors in a cellphone! Operating at several gigaHz frequencies, even the inductance of a short straight trace on the printed circuit board is significant.

Here is how I plan to take the bitch out of it.    14ga, can spit it down the middle to get my 2 conductors and lay it out with ease and increase the capacitance with more surface area between turns. The wire with insulation is 1/16th in and looking at it closer on the profile the insulation looks to be about 1/64th in one either side so still 1/32 spacing between copper to copper.

Right out of the package its 35 turns and if i split the pair and bifi them the dia will grow some as it is 8.5in in dia right out of the package and turns will increase. Not double, i know, will see. I got this some time ago and now is a good time to use it. Thats what I bought it for.



Mags.