Big Joule Theif

[Xenomorph]

@Slayer007:
How would you integrate the BEMF Booster into the toroid winding concept?
Would you use a bifilar secondary to send the BEMF through the coil again?

[Inquorate]

Negative voltage

@ shlodo, does the amperage as well as the voltage go negative?

[slayer007]

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

The amp draw for the ignition coil was around 30 to 50Ma more.
But it was allso lighting another cfl.

But the cool thing I was able to pull the BEMF off the ignition coil and charge more batterys.

When charging batterys the cfl connected to the JT would go out but the one on the irgition coil would stay .

The batterys I was charging was 10 AA batterys and they charge up rather fast.

There is so many differant things you can do with this circuit.
I'v been having a lot of fun lately.

I allso tried the BEMF Booster thing I did with one of my other projects and was able to light up a 110 night with the BEMF.

It wasn't bright at all but it did light up off one AA battery.

[slayer007]

Hello Shlodo

Great to see you posting in the forums.
Them are some impressive numbers.

Excellent video's allso.
Please keep up the good work.

[Inquorate]

Dude, I have found negative current draw too

Which I posted in Aromaz thread yesterday..

This circuit needs lots of scrutiny. Will watch your videos tomorrow, off to bed now.

Tnx for sharing
:-)

[sucahyo]

I think you should try swapping the charge and the source part to see if charging voltage really have power not just "surface charging".

[shlodo]

My Joule Thief Experiments

Hi Guys,

Ive been playing around with the Joule Thief circuit myself and just wanted to share some results.

I did an experiment and crunched some numbers to see how efficient this circuit really is.

I found that (in first vid) the setup was over 20 times more efficient than conventional electronics, not considering the fact I was also charging a secondary battery.

I conducted a charging test and here are the results. I was also lighting 2 white LEDs while running the test.

start Charge Run
0 1.5 2.7
5 1.78 2.7
10 1.83 2.69
15 1.85 2.69
20 1.88 2.69
25 1.9 2.69
30 1.91 2.68
35 1.91 2.68
40 1.92 2.68
45 1.93 2.68
50 1.93 2.68
70 2.55 2.66
80 2.55 2.64

Heres the video:

YouTube - Joule Thief Charger - Crunching the Numbers 01


I built a larger Joule Thief that can light 90V neon from 3V. I found that the voltage across E and C turned from negative to positive as I changed the resistance. Also there is a point where the meter reads zero voltage yet the neon still glows. I cant make sense of it, Negative resistance??

YouTube - High Voltage Super Joule Thief Resonating 02

Anyway, just thought Id share this with u guys,

-Shlodo

[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

[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.

[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]

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.

[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]

@ 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]

@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.

[patmac]

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