Joule Thief

[Pirate88179]

@ Wilby:

I don't know.  These are good questions.  I guess all we can do is to try and see?  Hopefully we can find out without my getting zapped again.

Bill

[electricme]

Wow again, more advances made, big ones this time.

@MK1
back at the end of post 71 you asked me how many turns I put on my yellow torid, Primary bifilar about 40 the 2 secondaries each got 104 turns. I just tried it and the transistor got hot, so its back to finding out why, prob a wrong connection lol.

What I'm trying to do is create a duel output by exciting the flux in the torid by using just 1 JT. It seems the torid can handle it better than a iron core transformer. (No proofe, just what I think, but I have been wrong before).

I liked the output of your CFL, very bright.

Well MK1 it seems you have beaten me to getting a double JT working, my congrats for doing it the first time ever ha ha, go with it man, you deserve it.
Lets see if you can do a tripple JT

So I see you got the push pull config working using PNP and NPN transistors, would they be BD139 and BD140 complimentary pairs?
So how how much current are you getting? is this OU? is there any radent energy involved?
Will the output be able to recharge a battery? so many questions.

As Bill says sometimes, theres just so much more involved with this joul thief circuit, and we all are coming up with circuits that seem to work, pushing the boundaries, making things work when "others" say it is impossible. lol

@ jeanna,
Yes, nice photos of your fluro tubes, I carn't seem to get my hands on the same disposable cameras downunder, never mind.

@ bill
I will be interrested to see what you can do with that small trannie in your latest CFL.

jim

[Pirate88179]

@ All:

Here is a photo of my latest JT coil I just wound tonight.  It is wound on a ferrite that is .750" dia x 1.250 " long.  It took a lot more wire so, I don't know what effect this will have.  I am going to use my last N3904 transistor on this one to see what happens.  (You can see the other identical unwound ferrite on the right in the photo)

@ Jim:

I can't wait for my new large breadboard to get here so I can begin to play around....ummm... I mean experiment.

Bill

[Mk1]

@electricme

I took the npn and pnp from a old printer a a2023 and c5611, but will work with almost anything.My multimeter dose not show me everything
i would need a scope, i can't seem to get any reading i believe it has something to do having no real ground connected to pickup coil
i think if we make them center taps to ground it will help getting answers.Its like it adjust  to needs.My original goal in making this dual joule thief was to see if excess voltage could be sent from one end of circuit to other with less voltage or even only voltage present in the caps.That would create a self running  jt and get energy from pickup coil getting a type of battery generator.

@pirate

What is that wire single or multiple strand and the gauge seem big a bit for that toroid you will need more turns to get decent induction?
Single strand works real well and tight.

Also other types of materiel with conductive properties but more resistive may get us more voltage per turn so more in less space.

[Pirate88179]

@ MK1:

That is multi-stranded 22 ga. wire.  This is the same wire I used on my other JT's with the 1" o.d. toroid.  I just found a company in NJ that sells 4" o.d. toroids.  4" should allow plenty of windings.  I don't have a price from them yet, but it should not be too bad as it is a standard item for them.  These are 1" think also so lots of mass there.

Isn't 4" about the size SM used?

Bill