Joule Thief

[TheNOP]

@mk1
the ones with coating would be 18 gauge or more.
will be hard to twist that, but should work.

i think thinner and more turns should work better tho, for the core.
but i won't be able to test that until i find some thinner garden wire.

[Mk1]

@TheNOP

I would said harder but not hard, I believe the iron is different. any any one has one.

But i don't know if there good enough to get my results , so far my toroid is one inch.



@all

http://www.youtube.com/watch?v=_h2EYPvQDqE  Just because of George.

[resonanceman]

It  may  be a while  before I  get to  the point of playing with iron  cores ........but  some of you  are there  now  ,,,,,,so here is an idea I was planning on trying .

One of the ways  that is used to keep inductors from coupling is to place them at 90 degrees to eachother.

It seems to me that  if  a wire is wrapped  around   a toroid made  of   a few loops of iron  wire  the  iron wire and the windings are 90  degrees   apart

If  the  iron  wire for the core is wrapped around  a plastic  tube or something flexible  .....it becomes a coil and  parallel  to the  copper coil
Once  the  first layer is wrapped  the plastic  tube could  be formed into a circle  and then another  layer of windings added if required .


A number of iron wires could   be  wrapped in parallel   to keep the resistance low .......


I am  guessing  that being in the center  of the  toroid  and being  iron  it should  be very sensitive ..........but it  could  overheat because of the  higher  resistance .


gary

[Mk1]

@all

tesla showed us to make core from iron wire but also to isolate them , But why , since the coil wire are isolated them self.

Because the core is a coil.

[jeanna]

the resistance at the base need to be under 1 k .

Except that 1k gave me really good results for most of my toroids.

I think it may be the toroid.

I don't know what heats up the transistor, but I am guessing it is too much voltage that heats up a transistor. And that would mean that you should limit it even more.

Anyway 14.7K base resistor was the sweet spot on one of mine.

I sure could be wrong, here, but that is what makes sense to me.

jeanna