Joule Thief

[nievesoliveras]

gary

Thank you @resonanceman!
I am trying with a 120v to 12v transformer. I will make the joule thief on the 12 volt side that has three wires coming out.

If I test betwen the middle and anyone of the side wires it gives 5.99v.
If I test between the two side wires it gives 11.99v.
Meaning it has a center tap.

These measurements are with the transformer connected to the house electricity, so the voltage read is AC.

Jesus

[gadgetmall]

Toroids are cool and they also produce vortex magnetic flux . I got em all . the rod ferrite preforms well with just mobius on one wire and ccw on the other wire . It runs a 2n3055 way lower than it should but i have some toroids that run practically from nothing and amplify. I'm Sticking with the circle as tesla did in more than one patent because of the continuous medium verse air or rod core because i do see a difference in them . and they keep your fingers busy which is good when you get older (80- 100) , My family lives long  lives . the  youngest to die was 88 and the oldest was 104 . I guess thats why  i have been told i look like a teenager at 52 and still get carded for Ciggs . BTW My great great grandfather smoked 4 packs a day and live for 104 years .


Gadget

Gadget

[jeanna]

I think when you are trying to copy something which nature has done, which I think we are doing in creating electricity for our wires, we have a better shot when we copy the shape of it too. Maybe, it evolved to be the best shape.

It is the reason I think the iron core is best too.
I was astonished when someone maybe Bill said that ferrite is the form iron is in when it is mined.

You can make a toroid air core by wrapping the wires around a bendy straw, but it may not be as powerful.

Last week I took a Stubblefield coil out of the box and connected it as a joule thief and it with its linear arrangement and 360 turns gave me 3.6volts at 41.6KHz off the secondary. When I removed the core, the voltage went up a squeek to 4.5volts but the frequency plummeted to 7.5KHz. (This is as read off a secondary which may be too short.)  I just do not think the air or the straight shape is much benefit.
It certainly works. I am not saying this is scientific, but it does not impress me enough to change from the reflection of the shape in nature which is the torus, to the cylinder.

Good question Wilby,

jeanna

[jeanna]

Hi Gary,
(and ist too?).

Where do you put this MOT in your joule thief circuit? Did I miss the description?

Is this a pre transformer that makes high voltage go into the joule thief?

thank you,

jeanna

[Mk1]

@all

I am Canadian , i like donuts .

Toroid there is a so simple answer , in a strait core you can easily see the magnetic flux because it has no where to go but out of the core ( its a electro magnet) , if you put a second core and coil in line with the powered one you will be able to capture voltage for the unconnected coil like a pickup , so a toroid doesn't let the flux out so easy since the poles are contained and feeding them self instead , there will always have be loses but are more then just loses there opportunities to get more...

A radio , transformer , tesla coil , are the same thing....

So this little jt is emitting radio waves i bet those with scope would witch freq to tune to.

Also tesla bifilar is just another way to call pancake coils .


Mark