TinselKoala's Magnetics Workbench

[ramset]

Yes it is big perhaps Bill can rec comend a place to start?
Chet

[Pirate88179]

@ Chet:

Thanks for posting the link.  That is the topic started by LocalJoe.  A lot of good experiments and information there.

The topic I started is: http://www.overunity.com/index.php?topic=4455.0

Sorry I didn't hunt up the links in my earlier post.

As far as what to read and what to skip....very hard to say.  A lot of good information is buried in along with our learning curve and patent research.  A lot of good folks contributed to both of these topics.  I just think it's cool to wind a coil and be able to produce numbers like 1.8 vdc and 80+ milliamps for free.

Bill

[TinselKoala]

Yep, that's certainly pretty cool. You should have no trouble at all lighting some LED's with that.

But I don't think those are the type of bifilar coils that 0c is asking about. We are talking about series-connected flat bifilars like Tesla described in 512340.

I think the coils you are describing are wound differently and use different materials. I would like to know the details of the wiring; I couldn't find it from a casual skim thru those threads.

[Pirate88179]

Tinselkoala:

The coils are simple.  copper wire (solid, bare, not magnet wire) and iron wire. (also non-coated)  These are wound bifilar style around an iron core. (large mass, very high iron content)  Now for the hard part.  Nathan Stubblefield used cotton insulation between his core and the fe and cu wires and between the cu and fe wires themselves, and the layers too.
Back in his days, late 1800's, cotton insulation was just about all there was.  You can still find it today but very expensive. (It comes in tube form and you slip it over your wires as you wind)  Some of us cut cotton strips and wound that around the wires while winding but that makes the coil pretty bulky in my opinion.

What I did was to insulate the core with cotton cloth, wound my first layer of copper and iron together and then, took cotton cord and forced it in-between the wires by turning and winding the coil. (hard to explain)  This isolated the cu and fe wires.  Then wrapped cotton material around 1st layer, repeated everything for the following layers.

These types of coils put out power when totally dry.  When moist, the output really goes up.  When planted in the ground and left for a while, you get the best output by far.  One of our experimenters wound a Tesla type pancake coil but I don't think he got any decent results out of it, I am not sure.

Funny thing is, we found (Thanks Hans) photos of Stubblefield and Tesla together.  Stubblefield is honored here in KY (Murry) as the father of radio.  In actuality, he invented the cell phone and this was in about 1890.

Fun stuff.

Bill

[0c]

Thanks for the reference but a Stubblefield coil is NOT the type of bifilar coil I was referring to. A Stubblefield coil is actually wound so the current flows in opposite direction in the parallel wires and cancels out almost all magnetic effects. A Tesla bifilar coil is wound so the current is flowing in the same direction in the parallel wires and can enhance the magnetic effects, at least with AC current. Part of this experiment is to determine whether DC or transient DC pulses will also show any enhanced magnetic effects.

For those interested in Stubblefield bifilar coils, I have gone through the first 1,000 posts in that thread and here are the most significant posts I could find:

http://www.overunity.com/index.php?topic=3500.msg64060#msg64060
http://www.overunity.com/index.php?topic=3500.msg66123#msg66123
http://www.overunity.com/index.php?topic=3500.msg67858#msg67858

Repeat, the experiments in this thread are about the Tesla bifilar coil, NOT the Stubblefield coil.