@Farmhand:

Just to make everything absolutely clear I also attach a circuit diagram for testing a "loaded coil" (coil with a parallel capacitor to enforce a particular resonance frequency).

I know that you have much more experience than me, I just want to match our measurement methods to be able to compare results.

I have no clue how to measure the resonance frequency of a series LC tank?

Greetings, Conrad

Quote from: Magluvin on January 13, 2014, 09:18:54 PM
Hey Sync

Where is the diode and cap?  You have 2 resistors in parallel across the coil. Or is that the way they tested it?

Mags

@Farmhand,

First of all the "Synchro coil" is a series bifilar coil and is on topic for this thread!

@Magluvin,

That's just the way they tested it. Conradelektro goes on to point out a further test for spontaneous charge with a capacitor and diode, but he failed to use an electrolytic capacitor. These deletions and substitutions were radical departures from my original design.

@Conradelektro,

You ask what the hi-voltage potential does between the bifilar wraps. What does Ohms law tell you about high voltage? Ohmic resistance is inversely proportional to voltage. Radio waves encounter practically no resistance whatsoever. A spark can be detected in the far reaches of outerspace.

Milehigh calls my nail and paperclip test a grandiose claim. The Tesla series bifilar pancake coil was a bulwark of the scrap yard industry for nearly a hundred years. There were tens of thousands of these of these kinds of electromagnets all throughout America. The thick wire coil sat over an iron plate. There was a liter size capacitor and a six volt battery inside. The cab controls consisted of a double throw blade switch and a volt meter for the capacitor, with a DPDT to reverse for deposit. The magnet was suspended from a crane. Now the balde switch would charge the capacitor one way  from the battery then discharge the capacitor over the scrap and permanently magnetize it to the iron plate for movement. A second reversed impulse from the capacitor released the scrap!

Milehigh calls my results Grandiose! It's no no wonder why he attracts a plethora of abuse from me!

The Ed Leedskalnin PMH works by the same principle. It needs an "Impulse" to align the magnetic domains of the iron. The high potential between the bifilar wraps amplifies and transports this impulse to the iron ferrite to transmute the material to a permanent magnet.  

This video demonstrates the permanent magnet effect of BIFILAR COILS CONNECTED IN OPPOSITION:

http://www.youtube.com/watch?v=NRdVlWSLt_Y

Pay special attention to 1:20 in this video. You can clearly see the SPARK jump!


Testing the Tesla series bifilar pancake coil with pure D.C. power yields totally bogus results! Milehigh has seduced Conradelektro into conspiring with him to totally pervert the real attributes of Tesla's valuable invention, along with my "Synchro coil".

I currently have two no limit open bet challenges to these pretenders, both have been shied from by them.

Quote from: conradelektro on January 14, 2014, 09:43:58 AM
...

how to measure the resonance frequency of a series LC tank?
...

Hi Conrad,

Would like to show you a drawing how you could measure the resonant frequency of a series LC tank, see attachment.  (I used some of the drawing symbols you also used in your own drawings.)

At resonance, as you surely know,  a series LC circuit has the lowest impedance which is equal mainly to the coil's DC resistance (usually out of all the L and C losses the coil wire resistance causes the highest loss).  This way, at resonance the AC voltage amplitude appears to be the maximum across the 50 Ohm non-inductive resistance, R, and if you sweep the generator above or below this frequency, the amplitude gradually reduces, how quickly it depends mainly on the Q factor of the coil.
I watched all your recent videos, they are good, thanks for showing them.

Greetings, Gyula

EDIT: perhaps the scope probe of CH1 as shown across the output of the function generator is not needed at all or if you wish to use it, then I suggest using also a series 1 pF coupling capacitor because the 100 pF cap of the probe can also influence the resonance of the series LC tank. 
A question: do your probes include the 10:1 division ratio or they are only 1:1 probes?

Quote from: gyulasun on January 14, 2014, 11:56:32 AM
Hi Conrad,

Would like to show you a drawing how you could measure the resonant frequency of a series LC tank, see attachment.  (I used some of the drawing symbols you also used in your own drawings.)

At resonance, as you surely know,  a series LC circuit has the lowest impedance which is equal mainly to the coil's DC resistance (usually out of all the L and C losses the coil wire resistance causes the highest loss).  This way, at resonance the AC voltage amplitude appears to be the maximum across the 50 Ohm non-inductive resistance, R, and if you sweep the generator above or below this frequency, the amplitude gradually reduces, how quickly it depends mainly on the Q factor of the coil.
I watched all your recent videos, they are good, thanks for showing them.

Greetings, Gyula

EDIT: perhaps the scope probe of CH1 as shown across the output of the function generator is not needed at all or if you wish to use it, then I suggest using also a series 1 pF coupling capacitor because the 100 pF cap of the probe can also influence the resonance of the series LC tank. 
A question: do your probes include the 10:1 division ratio or they are only 1:1 probes?

@Gyula: thank you, as always you are helping very much.

Yes, my scope probes also have a 1:10 setting and should have a lower input capacitance of 15 pF at 1:10. I also have a 1:100 probe with an input capacitance of about 7 pF.


I just did the measurement you suggested in your post (the series LC circuit). I was just trying to do that but I put a 1 K resistor instead of the 50 Ohm resistor and went now where till I saw your post.

I was measuring a 10 nF cap as a tank capacitor for my monofilar pan cake coil.

The "parallel LC tank" (10 nF in parallel to the monofilar coil) showed a resonance frequency of 270 Kilohertz (measured with an exciter coil and "classical", also the calculator at this web site http://www.1728.org/resfreq.htm confirms the consistency of this measurement).

Now, according to this web site http://en.wikipedia.org/wiki/LC_circuit the "series LC tank" should have a resonance frequency of 270 Kilohertz as well.

And it does!

But the measurement of the "series LC tank"  (probe over 50 Ohm resistor) is much less indicative than the measurement of the "prallel LC tank" (probe over coil). There is a maximum at 270 KHz, but it is difficult to see. The Voltage peaks from 150 KHz to 350 KHz. If I had not known the resonance frequency from the "parallel LC tank", it would have been a less precise result.


Also interesting, with a 10 nF tank cap (and a resonance at 270 KHz) the probe capacitance of 100 pF does not matter at all. Also the higher self capacitance of the bifilar pan cake coil does not matter any more. I tried it with the bifilar coil as well.

This gives me the idea to wind helical coils with many turns (a bifilar and a similar monofilar) for further tests in order to be in 100 KHz range (rather than in the Megahertz rang like with my frugal pan cake coils).

Greetings, Conrad