Joule Thief

[Groundloop]

@Freezer,

I have read about the Stubblefields battery but I have no idea on how it worked.

A friend of mine paid some money to call Mr. Thrapp. His impression was
that the only thing he was interested in was getting more money.

Great JT you made.

@electricme,

Is the attached circuit what you have been looking for?

(Edit) Added a drawing for common input voltage.

Groundloop.

[WilbyInebriated]

i wanted to add that a ferrite core is not actually necessary for the simple led joule thief.
in these photos i am using a air core coil for a crystal radio. 2n3904 transistor, 1K ohm resistor. it draws less than 10 mA.

edit: the coil is 50 turns of 24 gauge and 25 turns of 30 gauge in the middle.

[Pirate88179]

@ Wilby:

Wow!  No core needed eh?  And here I was going to order a bag of the ferrite toroids. Thanks for finding this out and posting it.

Bill

[nievesoliveras]

@wilbyinebriated

Is the joule thief running with the current drawn from the air?
Because I can see something that seems a battery there.
If it is running with just the crystal radio generated power. Would you be so kind as to post the schematics or circuits of the components configuration?
I would like to replicate it.
Good Job!

Jesus

[Pirate88179]

@ Jesus:

I believe he is running it off the AA bat. in the photo.  I think he just replaced our ferrite toroid with an air core coil which, I didn't know we could do.

Bill