To the one from the pdf (first attachment)
You described your coils like in the 2nd attachment.
Identical winding direction just 180 degrees turned around, starts connected with each other.
In futuristic's diagram the two coils are wound in different ways.

Quote from: konehead on July 27, 2011, 02:07:10 AM
Hey resonanceman:

Bill Muller would always tell me about "random polarities" in the very special black sand material he would use in his cores.
He said the ferrites inside the amorphous black sand particle would have crystalline structures encasing it,
if you looked at it with microscope,
and these crystalline structures were actually lava from volcano that cooled down, "freezing" the ferrites inside of the cooled lava, and so he said what happens is this makes the  the ferrites  all pointing in different directions, randomly, and this is why his big hockey puck neodimium magnets would just glide past them; not as easily as if aircores, but 100 times better than anything like iron....

So I dont know if that idea of sticking magnets on each side of core when the epoxy mixture dries is good idea, since it wouldfor sure align the ferrites in the mixture.

however, it should be advantage if a strong polarity to core is the idea...

anyways I dont know where you heard of making cores like that I am pretty sure bill Muller did not do it like that since he mentioned random polarities in the black sand maybe a dozen times....

also try super glue instead of epoxy in any blacksand/magnetite/iron powder cores - its stronger and easier and quicker to work with...it will dry like rock...

ciaoK

Konehead

I have no idea what will work best........ but I really like the idea of finding a way to make a core that works that ANYONE can throw together.

I will be testing black iron oxide cores both cured between magnets and  unmagnitized after I finish my driver circuit


In the attachment is the actual comments......... I did not save the information about the thread ...... You will probably recognize the forum..... it is not a forum I usually go to....... I am pretty sure I got there by following links from the Muller website.

gary

Edit

Superglue for cores?
sounds like a bad idea to me.
I am not sure what kind of mold release you would need.
Super glue requires water vapor to cure........it is not designed to be poured into a mold.
A catalyst is available but I do not know if it can be added accurately enough to control the cure rate.
If you add to much catalyst it will get VERY hot VERY fast. 
I once burnt my foot when  a drop of super glue landed on my sock
it stuck instantly and almost instantly got hot enough to smoke.

What @futuristic posted is 100% correct.

How is what he posted showing the coils wound different ways?

Quote from: mondrasek on July 27, 2011, 08:34:38 PM
What @futuristic posted is 100% correct.

How is what he posted showing the coils wound different ways?

See for yourself.

...