Joule Thief

[jeanna]

Here's another joule thief in a 2" ferrite core.
The joule thief has 20 turns and the extra pickup coil it has 160 turns,its 3 layers thick.

When its ran off a 12v battery it can light a CFL off the extra pickup coil.

Here is a video of it.

http://www.youtube.com/watch?v=E8durcYVl_E

Nice video,
for some reason, youtube is not letting me sign in. It bounces me back to signin... grr... I wanted to rate it..

So, I can ask here, to be sure. I made a jt with a lot of secondary turns and got some pretty disappointing results. I did not in this case wind the secondary in more than 1 layer. Do you suppose that is what I should change?

thank you,

jeanna

[innovation_station]

it will make a diffrance layered as it will pick up the other half .. on the back wind no?


anyways im haveing good luck with this little unit

i now have the 4led jt running on the solar switch from the orignal feed led supply i have the second transistos soldered and working from the led feed and switching off and on a seprate supply battery an aux batt... from the peddles ...  to feed the cam unit i will add that next to the all in 1 board driven by the solar led lights .. i might add extra jt's to the peddles just to use what is already there i will only put a few leds as i would really like to use this power for the cfl...

ist


moveing along nicely today ... 

[slayer007]

Nice video,
for some reason, youtube is not letting me sign in. It bounces me back to signin... grr... I wanted to rate it..

So, I can ask here, to be sure. I made a jt with a lot of secondary turns and got some pretty disappointing results. I did not in this case wind the secondary in more than 1 layer. Do you suppose that is what I should change?

thank you,

jeanna

I think it has a lot to do with the cores.
The one I'm using is ferrite.
I tried it with a couple other cores that were not ferrite and I couldnt get any voltage out of second coil.
Even tho the JT was working and puting out 4v for the BEMF.

Mk1 said he was able to get voltage out of his secondary using non ferrite.
But I didnt have any luck with out using ferrite.

[jeanna]

Thanks both IST and Slayer,
All the toroids I have bought have said simply ferrite toroid.
This one says high permeability. I don't know if that is good or bad for this. Nobody answered my question on that yesterday, so I guess nobody else knows either.

I guess I will just rewind the secondary into a few layers and see what happens, then I will try to sort out some of these properties.

Also Slayer, on this latest video, you show emf voltage and another voltage you say is from the secondary.

I assume that is the rectified voltage off the secondary as MK1 describes it. Is that right?

In the video, you didn't show this secondary voltage when you went to 12volts and the cfl. Did it go off the chart? Do you know what it was?

thank you,

jeanna

[slayer007]

Thanks both IST and Slayer,
All the toroids I have bought have said simply ferrite toroid.
This one says high permeability. I don't know if that is good or bad for this. Nobody answered my question on that yesterday, so I guess nobody else knows either.

I guess I will just rewind the secondary into a few layers and see what happens, then I will try to sort out some of these properties.

Also Slayer, on this latest video, you show emf voltage and another voltage you say is from the secondary.

I assume that is the rectified voltage off the secondary as MK1 describes it. Is that right?

In the video, you didn't show this secondary voltage when you went to 12volts and the cfl. Did it go off the chart? Do you know what it was?

thank you,

jeanna

Yes, the yellow meter was showing the rectified voltage off the second coil.
The red meter was showing the bemf coming off the collector going through a diode.