Toroidal Coils

[xee2]

Contracting the coil reduces inductance some, but increases the output voltage.

How are you measuring coil inductance?

[d3x0r]

How are you measuring coil inductance?

I have an inexpensive LC meter.  I also put the values into coil inductance caluculators based no dimensions.

[d3x0r]

Contracted coils can be inverted in the center; to form a somewhat sphereical cavity.  I have put a large round ligthbulb in this coil;  The red/green bifilar is the same size, and could accomadate the bulb.


I have learned that with a tight area, the small coil with LED can pick up a field.  At each of the tight intersectoins, but not in the center.  But I can put a conventionally wound toroid in the center, aligned horizontally the same and get an inducatance.


(you can sort of see the LED is lit, a glimmer in the camera flash... the toroid in the center is wound in electical tape and a few turns of red/green 12g wire....


The small pickup coil I was using picks up a field where it is tighly contracted at the top and bottom, but not in the center; which is what then led me to think that the field in the center is really more a conventional ferrite torroid... and I got 5V+/- on that toroid from a +/3 2.5V input on the outside ...

[d3x0r]

4Mhz Signals are magic....


the video... 


attached schematics,


L3/L4 is the 12g coil (large, expanded)
L5/L6 is a toroidal coil in the center of the contracted center of L3/L4; L5 is 12 turns, L6 is 70 turns There is another winding that is unused on it that is also 70 turns.


The grounds are not the same ground; the ground common to the coils is to the plug in the wall;


the ground on the signal generator works as a ground for the LED load as well as the earth ground; but if they are together, the signal doesn't work right.   In the video, they all share a common aluminum heat sink, except the signal generator ground, which is loose and is not connected to anything.

L1/L2 is a small coil, about 24 turns; made of 2 lengths of about 8 feet of wire; after removing it and retuning slightly was able to get the same output to the LEDs with and without the L1/L2 coil; however, the ground and the signal are together...

Edit/ Had the signal output on the wrong side

[d3x0r]

I found some rubber plumbing washers that are slightly smaller than 1" ID and slightly more than 1" OD, I wound these with 12 turns of 4 filaments in the same direction; then connected the two pairs together so I have 2 filaments with 24 turns; all approximately 1"; my meter measures 0.25-0.26uH; coil inductance calculator for 24 turns at 1" and 1/8" tall (I would have guessed 1/4") is 25.2uH, (1/4 is 20.6uH).  Each resonates at 2.5Mhz or so, to the same level.  I did have a few times where I had a acoustic-beat waveform, but shifted their positions on ferrite cores (these are tubes through the center of the toroids) and removed the beat; which imroved balanced output.  But with each section, if I make a change to another section, rebalances what is the resonant frequency. 

I put them on some of the ferrite cores I have to provide a little tuning/balancing. 


Empirical information; I started with 1, and got it tuned so it would light its lights with and without a scope probe; when tuning with the scope attached, the frequency changes significantly enough to matter.  As I added more coils, I had my first coil lighting maybe 24LEDs in series; but then when the second one got added, I could light 12 on one and 12 on the other.  Then I added the 12V LED module, and after rebalancing could light 5-6 and 5-6 and the 12V module.  I finally added a 4th coil, attached to the bridge rectifier and a capacitor.  Original frequency started at 3.3Mhz or so, and ended up at 2.22Mhz.


  So from all of these I should be able to calculate the maximum current the signal generator is generorating, but I won't.  The point is, power in = power out minus losses.


The geometry of the coil yields a solenoid of most collapsed dimensions.


The convergence of wires yields a n/s composite field at the 1-2 focus points.  These points should stimulate a solenoid coil.


If there are 2 focus points, the area in the center will stimulate a normal toroid coil (90 degrees from a solenoid)


Even if there were a vortex, without a continuous pulling motion to keep it stressed, it will collapse back to its negative state.


There seems to be no difference between 1 layer and 2 layers going in opposing directions.


Attached schematic is my latest test setup; I won't bore you with videos, it would just confuse the situation with my rats nest wiring.  (I started with both grounds connected, so there is a connection between these two ground points.


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For a while in the beginning, I had another coil also with approx 24 turns, slightly larger, which had a stray lead attached, and was picking up enough energy to resonate; the capacitance from my body field would adjust the frequency enough to shift from the first coil to this coil powering very reliably; probably very theramin-like.


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I did have certain wiring directions where the scope was picking up a DC bias of 6V or so... and measuring between the test point and ground with a DC meter confirmed that there was a DC bias; but it was floating and not grounded, however, that did bring me back to thinking about making a area that was a positive potential, but worked relative to itself, which would thereby generate a current from ground through a filtering load and to the circuit....


Oh and one more thing, if you do have someone on a swing that weighs 150 pounds (68Kg whatever), and push them with 1/8 of their weight, you will increase the height of their swing (okay substitute something for someone, so it's not alive or animated).  If near the top of their swing you put a board attached to some other lever system, when the swining object hits the board at the top, it will lose part of its energy; it will remain in resonance itself until the friction on the chain/air slows it to a stop (a much lower ressitance than is experienced by signals in electronics); but anyway, you can only steal a fraction of the power of the resonance, or it will stop entirely; and if your input in insufficient to keep the difference active... then the swing wont go high enough to trigger the load properly)