Joule Thief

[jeanna]

I just made a totally copper thingy. It is made the way the guy on the youtube video linked by jadaro showed.

1" diameter 5 turns bifilar wire around that then continuing with 10 turns around this core. It lit the primary jt led.
It lit it well,
but I did not get anything from 5 turns of a secondary.

If someone else gets good results with this I will try some other numbers of turns etc.

I spose it is an OK way to make a standard joule thief, but it won't be doing what we are doing.

I just reviewed a bunch of my others. Yes they are still good.  They didn't weaken from neglect.

On to a MK2 or 3!

jeanna

[slayer007]

I was woundering if we had Leedskalnin type coil on a toroid.

With a couple pickup coils in bettween the two main coils if it would do any thing.

[Mk1]

I was woundering if we had Leedskalnin type coil on a toroid.

With a couple pickup coils in bettween the two main coils if it would do any thing.

I am a fan of Ed , but i don't really get , what you are saying please , give more details.

Mark

[TheNOP]

You only have induction with copper no transformer effect here.

i might not be interpreting this correctly, but...
a transformers can not work without induction.
be it a 2+ coil(s) or an auto transformer(like the second transformer in the fuji's circuit trigger transfo)
curent passing through a wire create a mag field that induce a current in an other nearby wire.



@jadaro
no matter how you do your transformers the most important things are the surface, the speed of change and strength of the mag field.

each turn can add up to a mag field, but for that you need a way to concentrate each loop into one spot, a core.

the problem with cores is that all material you can use today, to concentrate the mag field, have hysteresis limiting the highest frequency at witch the core can work at.

[slayer007]

I am a fan of Ed , but i don't really get , what you are saying please , give more details.

Mark

If you have two coils on a U shaped iron rod.
Both north sides of the coil facing out then you connect the negative side of one coil to the positive side of the other coil.
With a small piece of  lite iron  tutching both ends of the coils.
Then you pulse a quick jolt of power into the coils the coils they will stay magnetized even when the powers unhooked.

I was woundering if done with a toroid if the magnetic force would keep going around the toriod.
Then if you had a couple pickup coils in bettween the two main coils if you could pick up any power.