Big Joule Theif

[slayer007]

Using two transistors one to trigger the base of the other I can get it to light with just one battery.
It's not bright at all but it will light up.

[slayer007]

To wind the cores I would First wind two strands of wire on a small bolt.
That way I could just put the bolt through the center of the toroid.
Then I would wind another bolt with just one strand and do the same.

I think you could go a lot higher than 160 allso
I would like to do another one and put as much wire on it as I can and see what happens.

Edit.
I said small I ment small diameter the bolt was about 4" long.
If you give your self enought slack its just like sewing. LoL

[slayer007]

Here's a short video showing the CFL light off one AA battery.
Using one transistor to trigger the base of the other.
It lights but it's not bright.

http://www.youtube.com/watch?v=peOiMKL7zeI

[slayer007]

I wound another toroid today.
The joule thief was the same but the pickup coil I made biger.
This one was eight layers thick.

It does light the cfl a lot brighter.
So I guess you should try to make your pickup coil as big as you can.

as Joit said ratio 1:1,61 is better

[Xenomorph]

@Slayer007 :
I think no-one has tried to wind a toroid with the winding proportions of the Fuji-disposable camera circuit (details in the overunity.com thread) , which seems also very efficient. It has 6 and 15 windings and 1750.
But your 8 layers will get you close to 1000 winding already i guess.
Interested to see what your future coils will be able to achieve

[StevanC]

how about which BJTs go (a list in order of preference)?
MJE3055
TIP35
2N3055
?

How do the IRF260 would perform here?
or the infamous IRF2204 ?
???
:-)

[slayer007]

Here's just a shot video of the coil with eight layes running a cfl off one 1.2v AA battery.
The light is quite a bit brighter than it was with just four layers.

I allso tried it with two AA batterys and it seems to use less current for more light.

The joule thief uses the same current with the four layer pickup coil as it does with the eight layer coil when its not under load.

YouTube - Joule Thief eight layer coil lighting cfl off AA battery

[patmac]

TIP41C, is a good choice too, is equivalent to BD243C that show Bedini in his circuit's, good amperaga and hfe gain.

[lookingin]

@slayer007 and lidmotor,
Love your work, First post here. Just a few questions.. Would a protection diode need to be used? And the load... Is it the coil? or the cfl? Plus would the diode, make it draw more? Also the diode connected across the load to protect the transistor from the brief high voltage produced when the load is switched off or disconnected? As you can tell I'm new at this, and have so many questions. I'm an old man learning new things.

[slayer007]

@ Lookingin

Hello, and Thanks
No I don't use a protection diode in this setup.
But it wouldnt be a bad idea if you was going to run it with more power.

The load was a cfl connected to the second coil.

If anyone would like I can draw a circuit showing how I use the second transistor.

[lookingin]

@ Lookingin Hello, and Thanks
No I don't use a protection diode in this setup. But it wouldnt be a bad idea if you was going to run it with more power. The load was a cfl connected to the second coil. If anyone would like I can draw a circuit showing how I use the second transistor.

Slayer007, Please.. I have a good Idea, but it would be helpful. Also a better description of your coil would be nice

[slayer007]

Here is a crude drawing of the circuit I used.

The joule Thief has two strands of wire I'm using 23ga.
Only 20 turns one layer.

The black dots are the start of the coil.
Notice the the start of one coil strand and the end of the other coil strand going to positive.

The toroid is ferrite 2".
The pickup coil is 23ga. allso.
eight layers going back and forth.

To use the BEMF you can eather use positive or negative of the source battery as negative for the BEMF.

I like to use the negative side.

[Lidmotor]

The Slayer007 JT/CFL circuit

Here is a crude drawing of the circuit I used.

The joule Thief has two strands of wire I'm using 23ga.
Only 20 turns one layer.

The black dots are the start of the coil.
Notice the the start of one coil strand and the end of the other coil strand going to positive.

The toroid is ferrite 2".
The pickup coil is 23ga. allso.
eight layers going back and forth.

To use the BEMF you can eather use positive or negative of the source battery as negative for the BEMF.

I like to use the negative side.

Thanks for posting the circuit diagram. The diagram of the coil really helps. I figured that the secondary did not go on top of the primary and I'm glad that you showed that. I tried your "bolt" method of winding the coil last night and that works great. I used a 6"by1/4" plastic tube that I had and it did the job. I may wind the long wire on the tube with a 1/4" electric drill before I "sew" the 2" toroid -- when it comes in the mail. I may try the circuit out on a ferrite rod that I have while I wait. I can wind that rod up quickly. I made a CFL inverter coil using the rod in another experiment and it worked.

Lidmotor

[slayer007]

I wound another coil yesterday even biger than the other.
This one was 12 layers thick all most as much wire as I could fit on.
It does work a little better.

Allso inbetween each layer I would put a layer of masking tape.
It just helps to insolate the wires and makes it easer to wind the next layer.

When it was running off 2 AA batterys I allso hooked up an ignition coil to it.
collector going to it then the other side going to positive.
It allso light up another cfl.

[shlodo]

I wound another coil yesterday even biger than the other.
This one was 12 layers thick all most as much wire as I could fit on.
It does work a little better.

Allso inbetween each layer I would put a layer of masking tape.
It just helps to insolate the wires and makes it easer to wind the next layer.

When it was running off 2 AA batterys I allso hooked up an ignition coil to it.
collector going to it then the other side going to positive.
It allso light up another cfl.

So u had the Thief running into an ignition coil, cool idea. But wat was your amp draw Slayer007??
did the load dictate your draw on the front end?

cheers