The bifilar pancake coil at its resonant frequency

[TinselKoala]

Great work TK!  The mysteries of the series bifilar pancake coil explored!

Thanx! It's work anyone can do for themselves if they follow your suggestions and have the knowledge, the skills and the equipment necessary. Too bad some people posting here have none of the above.

Here are 30 second sweeps from 1kHz to 25MHz of the monofilar pancake coil. Same setup, big difference. The voltage across the resistor does not rise again after the minimum is reached. The little bumps at the end are due to my cheapo DDS FG crapping out and not making a decent sinewave any more.

[synchro1]

Thanx! It's work anyone can do for themselves if they follow your suggestions and have the knowledge, the skills and the equipment necessary. Too bad some people posting here have none of the above.

Here are 30 second sweeps from 1kHz to 25MHz of the monofilar pancake coil. Same setup, big difference. The voltage across the resistor does not rise again after the minimum is reached. The little bumps at the end are due to my cheapo DDS FG crapping out and not making a decent sinewave any more.

@Tinselkoala,

No one can trust you to hook anything up right. You can't figure out how Bedini ran his "Ferris Wheel"!

[TinselKoala]

How about this magic, MH: 

Here is a scopeshot of the TBF pancake coil (661 uH, F_R = 273.2 kHz) being stimulated by a sine wave at the resonant frequency. The Blue trace is the source frequency,  the Yellow trace is the voltage across the current sensing resistor as used in the previous scopeshots connected as MH specified, and the Purple trace is the signal from a "pickup coil" (actually the monofilar pancake, it was the first thing handy to grab) suspended a couple of cm away from the TBF coil. Not connected (but share the common ground of course). It is clearly getting a voltage induced in it. But the current sensing resistor on the TBF coil is showing zero voltage across the resistor, which should mean no current flowing through it. Clearly, the TBF is still generating a magnetic field that alternates at its driven frequency, otherwise it could not induce a voltage in the pickup coil. Right? 

(Inspired by Gyula's questions, thanks!)

[TinselKoala]

@Tinselkoala,

No one can trust you to hook anything up right. You can't figure out how Bedini ran his "Ferris Wheel"!

It must be horrible to be you, baby doll. You are so insecure. You will lie, sling innuendos, make unsupportable claims and even Ainslie-troll threads to try to bury discussions you don't like, in order to salvage your pitiful insecure ego. You should have your doctor check your medications, because your paranoia level is off-scale and you are clearly in a meltdown phase.

I can clearly show that my connections are correct, and ANYONE, even you, can CHECK MY WORK and see if I am doing it properly or not.

And there is no mystery at all about any of Bedini's motors. By the way, this thread is not about Bedini motors.

[TinselKoala]

So, here's a frequency log sweep from 1 kHz to 5 MHz of the same setup as in the previous scopeshot (two full sweeps of 30 seconds shown). Stimulating the TBF coil of 661 uH and F_R of 273.2 kHz. 

Blue, stimulating sine wave; Yellow, voltage across the 9.4 ohm resistor in series with TBF coil and FG; Purple, pickup monofilar coil separated by about 1 cm from the TBF by wooden spacers and clothespins.

The big clipped peak in the Purple trace happens at the monofilar's resonant frequency of about 1.24 MHz.