Joule Thief

[Pirate88179]

Here is a photo for those that might not be familiar with the "Jeanna" circuit JT.

The 3 winds and the 13 winds are 22 ga. and the 400 winds are 26 ga. mag wire.

Bill

***EDIT***  On the output from the mag. wire, I soldered and anchored 22 ga. (Yellow) wire which would be more robust for flexing and moving around.  These become the output leads. ***EDIT***

[SkyWatcher123]

Hi folks, Hi pirate, i see, then you may want to try a non-polarized capacitor in parallel with base resistor, like the super joule ringer used.
It's how i got the air core coil radiant charger (alexkor charger) to work, which is just two wires wound together, 24 awg. bifilar, on top of a cardboard tube close to toilet roll size.
peace love light
tyson

[Pirate88179]

Hi folks, Hi pirate, i see, then you may want to try a non-polarized capacitor in parallel with base resistor, like the super joule ringer used.
It's how i got the air core coil radiant charger (alexkor charger) to work, which is just two wires wound together, 24 awg. bifilar, on top of a cardboard tube close to toilet roll size.
peace love light
tyson

Tyson:

Good advice.  That sounds like what Gadget was doing a few years ago in his JT circuits.  Did you say you got your non-polarized cap from a salvaged CFL?  I have a box full of burned out CFL's... all sizes too.  Thank you for the idea.  Lidmotor posted a comment on my video saying that he tried this a few years ago (battery as the core) with a regular JT and he could not make it work.  I may end up just moving the bat. from the tube and sticking it along the side and using some ferrite in there.

we will see.

Thanks,

Bill 

[SkyWatcher123]

Hi pirate, the cap on my alexcor air coil charger is using a 100 nanofarad 50 volt i think from the shack, sure cfl caps would work also.
Since me kind of stalled at the moment with ideas for enhancing cree bulb efficiency, will try this AA or AAA rechargeable core idea.
Is the idea, that with the AA cell as a core, that it might polarize itself being in the core position in some extra efficient way, that would be cool.
Have to dig up a plastic sleeve to slide the battery into.
Then will probably make 1 or 2 layers of 30 awg., then on top that, a layer or two of 24awg. bifilar.
Or maybe should just try the 24awg. bifilar first and power an led off E and C or just see how it is feeding back anything.
We'll see what happens.
peace love light
tyson

[conradelektro]

Using a battery as a core for a Joule Thief coil is like using an air core. That means one needs many more windings than with an iron or ferrite core.

Also core size matters a lot.

An air core diameter of 50 mm allows to run a Joule Thief with a 30 turn bifilar winding.

And as Slider shows in his video a core size of about 12 mm (AAA battery) needs a 120 turn bifilar winding.

http://www.youtube.com/watch?v=DjV2qG3xO5o

In case you want a third winding for a high Voltage output, the air core coil has to be big. Coil diameter 70 mm, coil length 300 mm, 1200 windings for the third high Voltage coil, 15 to 20 bifilar winding for the Joule Thief.

Greetings, Conrad