Hi everybody

I’d like to offer some speculations on Stubblefields bifilar coil.

I see the Stubblefield coil as a oscillator. I believe that the galvanic battery that it forms, is what kickstarts the oscillator into operation.

Consider 2 Tesla pancake coils that are placed on top of each other. They would surely interfere with each others operation. This could be overcome by placing insulation between the pancake coils.

 I would speculate that the insulation between the layers in the stubblefield coil be at least the same thickness of the wire that you are using. The 2 wires that are being used must be up tight against each other, but the layers must be further apart so that the magnetic fields of the one layer do not interfere with the next layer.

Just a thought
Regards

Sorry to move this post from the data logging thread but I guess no one is looking there.
You will all have to step into the "way back" machine to remember this post from last November.

Quote from: electricme
on November 30, 2009, 07:53:05 PM]
==============================================================
OK ALL,
Yesterday I posted I would do a experiment, the idea is to show which electrodes interact the best picking up earth currents, and the results are surprising.
I used a COPPER as the North and positave electrode.
Aluminium, Copper, Steel and Magnesium coated rod.

Copper Positave and Aluminium produced the best results
                                        AT REST   MOVEMENT   ANALOG
POSITIVE        TEST METAL   V DMM     V DMM         OBSERVATIONS
------------------------------------------------------------------------------------------
COPPER           MAGNESIUM = 36.0mv     71.0mv        needle slight movement
 
COPPER           STEEL         = -2.9mv     40.0mv        needle not moveing

COPPER           COPPER       = -20mv      -10mv          needle not moveing

COPPER           ALUMININUM = 80mv       198mv          needle swinging wildly back and forth
                                                                         
------------------------------------------------------------------------------------------

Results =
1st Copper as Positave, Alumininun as Negative  produces best results
2nd Copper as Positave, Mag as negative
coper and coper, copper and steel  = zilch
My test photo below showing the setup

Tiny Videos following below this post
jim
===============================================================


Question:
Were all the pieces of metal used in this experiment the same size?
I'm referring to surface area and not just length.

I've never seen where copper and aluminum produced the best effect.
So if one of the pieces of metal was larger (more surface area) than the other, then that might be an important fact that we could try to exploit.

DonL

Hi everybody

To show that its possibly the bifilar arrangement that makes the Stubblefield coil special,
and not so much the galvanic battery, consider this article from the JL Naudin website

http://home.comcast.net/~onichelson/VOLTGN.pdf

Kind regards

Hi everybody

To show that its possibly the bifilar arrangement that makes the Stubblefield coil special,
and not so much the galvanic battery, consider this article from the JL Naudin website

http://home.comcast.net/~onichelson/VOLTGN.pdf

Kind regards

further confirmation of bifilar.....Stubblefield's galvonic bifilar obviously an interesting twist isn't it? Interesting point on 2 tesla pancake coils in near vicinty btw... multi-layered Stubblefield coils, especially those reproductions which employ a 'there and back again' winding direction through multiple coil layers  do not compute with me. I would love for induction coil expert to set me straight on this one. My simple experiments indicate stronger magnetic field occurs with same direction winding philosophy. Or crudely put, better ability to pick up paperclips. Induction into a secondary also obviously better. There are optimization opportunities available. I guess I will start building again...

Regarding oscillation aspects...You are correct. There can be no other possibilities.

Your input very most welcome here. I look forward to hearing more

Here are more photo's of my Stubblefield Winding Machine.
These are of the motor, gearbox and chain drive, this had me held up for quite a while.

enjoy

jim


3200 = Back end of the 24 volt DC motor (I ran it on a 12v battery)
3201 = Motor is mounted to vertical frame and chain drive and sprockets are seen.
3202 = Closer view of the drive, sorry about the rusty plate, its all I had
3203 = First successful wind is done.

BTW, if anyone wants to make their own Stubblefield Winding Machine using my setup as an example, please do, you are welcome.

That is a nifty winder you have there Jim. I also liked your older posts on cotton insulating winder. That was very similar to what a local factory I use for rope style heating elements does. Only differences = they use more spindles of thread, they use variety of thread supply angles in relationship to target wire. Neat stuff and very inventive on your part...

@ all,
Continueing to test the Stubblefield Coil Winding Machine.

Please remember, this is using only a single strand of copper wire, it is not bifilar wire winding, that will be next.
All I am doing is getting used to how the machine works and to see if any faults come up, then rectify them as I go about using it, better to know beforehand using scrappy wire than using the good wire.

Already I have learn't it is not a simple process, my hands do ake holding the wire under tension, concentration is a big essential matter, I found if I loose concentration, as quick as a wink, the wire begins to form a gap or it travels over the top of the previous turns, so gotta be careful and on my toes all the time.

It takes a very long time to wind every layer, there is simply NO point in rushing this process, all turns must be neet and tidy, on of the essential keys to making the Stubblefield coil to work as Lasersaber has indicated in his remarkable youtube videos.

One improvement I want to incorporate is to attatch a alternator slip ring assembly at one of the shaft or bolt ends, to feed "any" energy out to a Volt meter or oscilliscope so I can see at a glance if a short has begun, I could instantly stop the wind and look at the short, or to monitor the turns number when electrical activity begins and watch its strength grow at every stage of the coils building.

That should be very exciting to do.   

jim

Here are another set of the last 3 tiny videos on this series.

4th = Winds begin for the first test.
5th = midway through the coil laying test
6th = Reached the end of the 1st layer test.

Hope you enjoyed this series, now you can make your own Stubblefield Coil Winding Machine.

...It uses a UGN3503u    3 pin IC (not a transistor) it's a radiometric linear Hall Effect sensor, Jaycar part number ZD-1902

Apparently, it has been discontinued and replaced with the A1301 and A1302
http://www.allegromicro.com/en/Products/Part_Numbers/1301/1301.pdf
Is this part plug compatible?