I did a first test with my first partnered output coil. Please see the attached drawings and photos (see the attached circuit diagram).

INPUT  10 Vpp Sine from function generator through 100 Ohm:
50 Hz Sine , Veff 2.2 V , VDeff 2.16 V , Watt = 2.2 * 2.16 /100 = 47 mW
1 kHz Sine, Veff 3 V, VDeff 1.5 V , Watt =3 * 1.5 / 100 = 31 mW
2 kHz Sine ,  Veff 3.28 V , VDeff 1 V , Watt = 3.28 * 1  / 100 = 33 mW
3 kHz Sine ,  Veff 3.36 V , VDwff 0.68 V , Watt = 3.36 * 0.68 / 100 = 23 mW


OUTPUT over 100 Ohm:
50 Hz Sine, Veff 0.028 V, Watt = 0.028 * 0.028 / 100 = 8 µW
1 kHz Sine, Veff 0.34 V, Watt = 0.34 * 0.34 / 100 = 1.1 mW
2 kHz Sine ,  Veff 0.39 V, Watt = 0.39 * 0.39 / 100 = 1.5 mW
3 kHz Sine,  Veff 0.36 V , Watt = 0.36 * 0.36 / 100 = 1.3 mW


The highest output is at around 2400 Hz: INPUT ~ 30 mW, OUTPUT ~ 1.5 mW.

I also tried a square wave signal from the function generator and the results were similar. A square wave signal causes spikes and distortions at the input and output. I will show scope shots in the coming days. But first I would need input from the experts (MileHigh, TinselKoala, others who know something, may be EMJunkie feels like helping out with some suggestions.)

I also know that the core halves should be separated a bit (may be several millimetres) to cause a loose coupling of the partnered coils. I have not done that yet.


Please comment. Help is appreciated.

Greetings, Conrad

P.S: (Tests with a higher current through the primary are in preparation, several Watt. Amplification of the signal from the Function Generator with a transistor and my laboratory power supply will be done in the coming days.)

Nicely done. If you scan through all frequencies you will find a frequency range that will cause the output voltage to peak, as you have noted.  I +think+ that is what EMJ is doing for "tuning", at least in Exp1 and 2 in his pdf. This is the quasi-resonant condition and will be higher frequency for "bucking" and lower for "aiding" connections of the partnered coils... and can even be calculated based on the inductances measured in each case. This difference in frequency can be pretty large if the inductance difference is large. (The 'bucking' connection is essentially equivalent to a standard hairpin bifilar "noninductive" winding as far as inductance cancelling goes. Whether it has other effects different from that winding is still to be determined, as far as I can tell.)

Don't forget, when scoping input and output at the same time, that your probe reference clips ("grounds") are connected together at the scope chassis (probably; you should check this with a DMM continuity tester with scope turned off.) Also check to see if the probe ground references are connected back through the chassis to the line cord ground pin. Make the same check for your FG, see if the "black" output lead (BNC shield) is connected back to the line cord ground pin. It's easy to create inadvertent groundloops with FGs and scope probe reference leads.

Why don't you guys start a separate oscillating magnets thread because it has nothing to do with the partnered output coils?

Magnetismus has nothing to do with the bucket coils? Maybe I forgot to insult someone in my comment to be a part of this thread
Fair enough , here is the last video of Acula , showing something what I believe belongs here.
http://youtu.be/pYjREkw1v-A
He is showing 2x60W  and he is gonna make it self-runner. His next design will be on iron core.

Ok, Let's be a bit nice to Tinsel too.    You might be right about the oscillating magnets.  The mass , center of mass , the distances and the strength of magnetic field might (and does) play role here too.  On the picture you can see my set-up. Two magnet discs on long magnet bar and in my hand I am holding the pulsing coil (yes Tinsel, there are not wires from that coil , I did this picture after I performed the test and I was lazy to put them back   ) In any case I was pulsing it from 3Hz up to 45Hz and as my frequency was rising so did the vibration of magnets - unfortunately. May be I did something wrong

In the back you can see my set-up of backed air core coils I play with. My ratio is there around 1:20 and I am getting HV on the cental tap. Some interesting effects there as well. May be I will do my fist YouTube video ever for you
Cheers,

How could you be doing anything "wrong" when it is so unclear just what "right" might be?
 

Your aircore coil set in the back could be run as a resonator for a solid-state Tesla coil. With the right drive frequency and coupling between the primary and the secondary you can get VRSWR: voltage rise by standing wave resonance, which will indeed produce interesting effects at the top of the coil.  It's easy to light up neons and fluorescents with the output, even with just ordinary drive straight from the FG to the primary. With a bit more circuitry you can make the primary drive "autotune" to the resonant frequency of the secondary, and feed the primary with higher current ... then you will _really_ see some interesting effects from the secondary.

A new clip from Itsu trying out a new configuration suggested by Chris:

https://www.youtube.com/watch?v=xr_4EgpBE7g&feature=youtu.be

This one is "fighting EMFs from two bucking coils creating a short circuit in parallel with a load resistor."  We are really pulling out all the stops.

It's related to the attached scope capture compliments of Itsu and his comments below plucked from OUR:

An alternative method to check if my coils are in bucking mode or not was presented by MileHigh on my youtube channel
He proposed to probe the both partner coils with 2 probes with the ground leads at the center point.
He states:   "The outputs should be in phase for bucking mode and 180 degrees out of phase for normal mode."

See here the screenshot of this setup which shows both signals in phase, meaning in bucking mode.

How could you be doing anything "wrong" when it is so unclear just what "right" might be?
 

Your aircore coil set in the back could be run as a resonator for a solid-state Tesla coil. With the right drive frequency and coupling between the primary and the secondary you can get VRSWR: voltage rise by standing wave resonance, which will indeed produce interesting effects at the top of the coil.  It's easy to light up neons and fluorescents with the output, even with just ordinary drive straight from the FG to the primary. With a bit more circuitry you can make the primary drive "autotune" to the resonant frequency of the secondary, and feed the primary with higher current ... then you will _really_ see some interesting effects from the secondary.

-,
That's what I have said before, it is like two Tesla coils connected et the tops and bottoms.

TK:

Thanks, I suppose "anything is possible."   I thought that it was supposed to be "sine wave in - sine wave out."

I mentioned a while back that the "sine wave in - sine wave out" is like testing a conventional transformer, but instead the conventional transformer is replaced with a "newfangled bucking transfomer."

With the low-side or high-side MOSFET switching you are back in Joule Thief territory, which is a completely different ball game.

MileHigh

Conrad:

Thank you for doing a replication To discuss your posting #472.

I don't get your usage of the 100-ohm resistor on the function generator side. Shouldn't it just be one ohm or even 1/2 ohm?  In other words just a current sensing/viewing resistor?  The power input to the circuit is the RMS voltage across the 60-turn coil times the RMS current as measured with the voltage across the current sensing resistor.

I am making an assumption that at low frequencies the current and voltage will be in phase.  Also, to be a bit more precise, with your existing probe placement, the AC voltage across the 60-turn coil will be the AC voltage measured with channel 2 minus the AC voltage measured with channel 1.  Again, I am assuming a one-ohm or 1/2 ohm current sensing resistor, not a 100-ohm resistor.

You should put component designations on your schematic (R1, R2, L1, L2, etc) to make life easier when discussing your circuit.

Your transformer itself looks great.  Note as a (hopefully) interesting exercise, you can take your analysis one step further because you measured all of the coil resistances.  So you can measure your power dissipation in the coils themselves.  I am "keeping it simple" here and assuming a sine wave excitation waveform from your function generator.   In theory there is nothing to be gained by using a nasty square wave excitation waveform.

MileHigh

The difference between "bucking" and "aiding" series connections of the partnered coils is just the reversal of the hookup of one of the coils, right?

So you can use the "Secret of DPDT", installing a simple double pole, double throw switch on one of the coils to "flip" its connection to the load and the other coil. The "aiding" configuration will have a higher inductance than the "bucking" configuration.