Joule Thief

[Pirate88179]

Wilby:

Great graphic!!  Thanks.  I didn't know that.  See, I learn something new every day from you folks.

Bill

[stprue]

@ Jeanna

I have ordered 100leds from Hazens source as well I cant wait to get them.  I'm also waiting on some toroid's that are over 3in in diameter, /DC-DC converter, more POTs .01uf 400v caps, mica caps and some other stuff.

Can't wait!!!

P.S. Since you have wound JT's so many different ways I might as well as you if you have tried the winding the JT part of the coil along the top of a torrid and then put another torrid on top of that, then wind your primary and maybe a secondary around both torrids?

[jeanna]

How short are the ones you got?

They are about half the regular length.
these are the non-Mandarin type. (that was my joke) shorter but still chinese.
I am pleased. Actually this is the right length. I always end up cutting about half off anyway.

jeanna

[jeanna]

if you have tried the winding the JT part of the coil along the top of a torrid and then put another torrid on top of that, then wind your primary and maybe a secondary around both torrids?

There is one I have not tried.

I am not sure about this. the JT part of the coil IS the primary. So, it would be already wound. then to put another toroid then add a secondary. ?

I think this might give interesting results along the lines of the mag amp.
If you put a cap and pot between the primary toroid and the secondary wire wound around both, you might get the stop reverse stop reverse that is described in some of the amg amp language. I don't know if it can be done without a transistor, but it may if you do it this way.

If you can get the toroid to stop working and the collapsing field to stop and have nothing work for a moment then have it all start up again just based on the flux plus windings I think you can make a transistor-less joule thief, but It is not something I have tried yet.

(so, who needs to sleep?)

The ferrite has to be the right kind.
The winds have to be the right number/s
The resistance and cap making the 2 coils talk to each other has to be the right amount.
I think it will be fiddly to get it right.
GO for it.

@All,
I just went to my profile settings and changed the number of posts per page from the default of 10 to 25. It really helps. I might even change it to the top number which is 50. My page references are all wrong, but "change is a good thing!"

jeanna

[dog812]

Well i made another Primary over secondary Torrid today..
6 - 6 on top of 70 turn secondary.
It works .. lights LED's.

What kinds of test should I be doing? I am still confused on what test really show any useable data.. To see which one is doing a better job?
If you can tell me where i should be doing these tests on my breadboard aswell that would be a huge help..

Here is a pic and my schematic i am using..
http://www.postimage.org/image.php?v=aVyBe1A
http://www.postimage.org/image.php?v=aVyBlw0