Joule Thief

[jadaro2600]

The primary coil is 26 turns of 30 gage wire wrapped around a AA battery with as many turns of 26 gage wire wrapped around as possible - it is, by reference, approximately 4/5ths the length of the primary.

I didn't wind a tertiary on this one.  the last one I tired didn't work, so I'll just have to make another one later.

[jeanna]

jadaro,

If you wrap a bifilar pair around your primary, you will have an equivalent configuration to at least mine and many others. This will show you if your copper wire core is worthy of pursuit.

This is how my mind works on this kind of thing and if it does not interest you, please say so and I will stop giving suggestions.

I got a lot of good results from most of my toroids. More than one light.

The one that gave me disappointing results was a 1 1/2 inch hi-permeability ferrite core. But these results were only poor compared to my other results.

for example: 1 jt wound with 11 bifilar turns (means 22 turns wound side by side but where the first of one wire and the last of the other were joined so the mag field oscillates)
When I wound 26 turns around as secondary I got a very bright light which drew only 6mA. When I rectified the voltage on this 26 turn wire I saw it was reading 1.99V

All of this was from a 1.2v NiMH battery.
So, I got more voltage from the secondary than I was putting in and I got a white led to shine brightly at 6mA where it normally would need 30mA for the same brightness.

These results only look good when NOT compared to my other results. But they are still pretty good.

I am hoping your copper wire can be tuned to give some good light. I appreciate what you are doing.

jeanna

[jadaro2600]

jadaro,

If you wrap a bifilar pair around your primary, you will have an equivalent configuration to at least mine and many others. This will show you if your copper wire core is worthy of pursuit.

This setup you suggested was tried - it drew more ma than what would normally be used to light the bulb.  As well, the freely wound unintegrated tertiary wasn't producing any results - so to answer your question, THUS far it isn't working.

Don't bother pursuing it.  The fields are at 90 degrees to one another, the coils it just a novelty in this thread thus far; in order to make it relevant and get the fields at 180 degrees to one another, i would have to make a fine coil of the secondary - it would be like a coil of a coil around a loop.

It's like waging war on logic though, it would be like using a guitar string for the secondary.

Conventional joule thief toroids use ferrite and the current bearing primary is of fewer turns and shorter length than the secondary going to the collector, or as the case may be with some of you, there is a pickup coil, aka the tertiary - where the energy is drawn off and utilized ...  there may even be a forth coil, where this is also used to draw off energy.

The designs are many.  I'm just looking for a ferrite free design so that from-scratch applications can be made.

Getting the fields at 180 degrees seems to be the key - I'm thinking that one of my linear transformers trifilar wound using the tertiary as the draw for LEDs  may be yet another way of going about it.

[innovation_station]

build an air core jt ... i did this too there is a pic in this thred...


use a old wire spool    plain old jt ... 

i bet you can use a secondary in a air core... but.... it must be resonantally tuned 

hence identical  coil

i can find you a video if you like ... 

mit made a good one ...  they just dont want to tell us what to do with it 

ist!!

video..... 

http://www.youtube.com/watch?v=gfUuwnD2-fg&feature=channel_page

1 more .. 

http://www.youtube.com/watch?v=3tDX85ZK14Q&feature=channel_page

[jadaro2600]

Air core!  ..it does work.  This is a step towards the Rodin style coil.