Joule Thief

[jeanna]

....

i have run IR and red laser diodes off a jt. needs current limiting or you're rolling dice with you laser diode.

Even with a joule thief using one AA battery? I guess if you have the resistor way down, that could be a problem.. I am still surprised that you say this.

thank you

jeanna

EDIT add:
@Dog812,
Yes, I do concur. You may want to test for amps draw with your new meter and see. I will explain if you need directions for that.

[WilbyInebriated]

Even with a joule thief using one AA battery? I guess if you have the resistor way down, that could be a problem.. I am still surprised that you say this.

thank you

jeanna

yup, one battery. sorry, my bad i meant to say regulated current.

[altrez]

Wow over 500 pages! This is something very special and I feel so blessed to be apart of it. Congratulation's Bill!!!!! I have a quick question I am looking at buying a new Toroid the cost is around 30 dollars! it has a Permeability of 5000.

Does that sound unreasonable? I would gladly spend over 100 for a good Toroid!

Thanks!

-Altrez

[jeanna]

OK

This deserves its own post.

It is about not needing the resistor at the base for the jt effect.

It is something I think is definitely possible on a first tier joule thief.
It has been well described by xee what happens in a jtc, but I think the bifilar winding has a way of making the current go back and forth even without the transistor.

If you look at the 2 tier jt I made the other day, only the regular jtc on the first tier has a transistor and resistor.
So, the secondary which is AC is feeding the second jtc as though it were a battery. (If it isn't really nice AC, it sure is pulsed dc.)
So, with that going into the second part of the thing, the whole second tier does the joule thief thing.
It does it all over the place too.

I have put leds in 3 places now and while they are related to the second tier toroid, only one place is in the usual way, and they all work.
In fact they work much better than they do when I keep the second tier exactly to 'code' for a joule thief.

So, who knows?

Just keep trying things and we will make more and more progress.

BTW, Isn't your circuit the one with the extra cap and extra resistor?

thank you,

jeanna

[jeanna]

Wow over 500 pages! This is something very special and I feel so blessed to be apart of it. Congratulation's Bill!!!!! I have a quick question I am looking at buying a new Toroid the cost is around 30 dollars! it has a Permeability of 5000.

Does that sound unreasonable? I would gladly spend over 100 for a good Toroid!

Thanks!

-Altrez

I think you want LOW permeability.
Hi flux low permeability.
Right MK1?

What we use is the cheap kind, I am pretty sure.

jeanna