Joule Thief

[Pirate88179]

Pirate,

Oops.. I did not see your post.

I apologize.. I did not check out the video as I do know an air core will light Leds.
                   I was not aware that there were CFLs in the video.

I need to get to work right now... I will check it later (before I go on with my assertions).

Are they resonating these air coils to accomplish the feat?

Best Regards,
                    The Observer

I believe this is a safe assumption.  I don't know it to be fact but, without any core, what else is there that can be performing the work?

I totally agree that resonance is a very important phenomenon.  We saw this back a while ago when "tuning" our JT circuits.  You could tune it for longevity (one point of resonance) or tune it for the most light output (another resonance point) or a compromise of both.

I have not built any JT air cores as of yet but MK1 has made many videos on his air core research.  Lidmotor just release a video of his aircore on Youtube but he was using it on an SEC experiment I believe.

I just got in from my first job and now am getting ready for my night job.  When I get a chance, I will search my youtube favorites to find some interesting and hopefully applicable videos.

Thank you for the compliments on my videos.  I need to be making some more and I will when I get the time.

Again, I totally agree that any OU electronics circuit will employ resonance one way or the other.  I also found a metglass core about 1" in dia. and I think the perm. specs on that are over 100,000 or something.  It might make an interesting JT.

I appreciate the back and forth and exchange of information.  This is how we can hopefully accomplish something really great.

Bill

***EDIT***  I did a quick search and found these but have not reviewed them.  I recognize some of the guys though.

[jeanna]

Hi everybody,
I thought I was just going to stop in and share a couple of led lights with you all, but I see things are cooking again.
So,
I first, guess I will make a non-answer to the observer and nickz,
@the observer,
I agree you are talking about something very few of us have considered.
My eyes usually glaze over when the "magnetic" folks talk about their ideas.
This is because I have not been able to sort out the magnetic stuff
....... except to know that the "free-loading" that happens on the toroid which allows a secondary to provide spiky volts to run a dozen leds and sometimes a cfl, is mostly possible because of the toroid shape (because the magnetics cannot escape as they can with a straight bar).

I would love to hear of some magnetic experiments that can be done to show how these theories work, because I do think they are a big reason for the magic of the secondary of the jtc.

@nickZ,
All I can say about your questions are that there is an art to making a good joule thief circuit.
Changing some of the important elements will change the way the circuit works for the other important elements, so change the transistor, or the toroid size or properties, or change the number of windings on the bifilar or the secondary and all the rest of the elements might change too.

It is easy to make a basic joule thief, and it is easy to get one to produce surprising results from a secondary, but to get an extraordinary one is tricky and really an art.
The best thing to do is read this thread with this in mind, because there is a wealth of experience shared about the different ways the parts work together.

Also, My first 2 joule thief circuits were made on a ceramic magnet.
They were lousy.
I never got them to work with less than 2 batteries in series.
Then I learned that a ferrite toroid was a special item and not a ferrite magnet shaped in a toroid.
The magnet saturated the transistors and they eventually stopped working altogether.
The transistors were fine later, but they needed to rest from the steady magnetic influence.

-----

OK,
I got a tip from a friend that wallyworld has new led bulbs, and I went to see today.
Both of these have more than the 20 of the led bulbs I have been using.
The Lights of america are made so the leds go in all directions, and this one looks wonderful inside a silk shade. It looks like a 40w bulb.
The 'accent led' bulb is very round and works for those bathroom fixtures where a big row of bulbs surround the mirror.
This light is really a beautiful color, and it does NOT need a shade.
The same company makes one with non frosted 'glass' and a candelabra shaped one that is frosted.

This is exciting because designers have been busy.

thank you,

jeanna

*PS... Hi Bill,

I appreciate the back and forth and exchange of information.  This is how we can hopefully accomplish something really great.

I agree.

j

[kooler]

                               (((((Why is an Acoustic Guitar louder than Electric Guitar ?))))) Thread.
                                                       I assert here quite heavily
                                                 against a stiff wind of opposition
                                             that Resonance is a Phenomenon that
                                       deserves A LOT of attention in an OU Forum.

                 

boring..
why don't you build us a aircore jt that lites a cfl and show us your spec's..
i built one back in june 2009 .. reason i didn't report my build.. it took me 28$ in wire to make it happen..
it had a 2000 turn secondary.. if that tells you something.. 229 ma's draw on a 1.5 volt battery..
i could shot a video of it running but what good would it be.. just to see people say wow.. and never build it..
cause they just like to (observe) and not build..

happy observing

[Mk1]

@all


FREE LUNCH

There is a simple air core jt lighting cfl , but cfl that is so retro 

Slayer , call his slayer's exciter , jonny and lid also have some variation on it .

Mark

PS hi everyone ! i will be spending more time here winter is coming and i got some new stuff to show soon !

[resonanceman]

I would love to hear of some magnetic experiments that can be done to show how these theories work, because I do think they are a big reason for the magic of the secondary of the jtc.



jeanna

Jeanna

Here is a link that caught my attention  a few days ago.......not exactly sure how I found it.....I  thought I was going to this thread and ended up there.


http://www.overunity.com/index.php?topic=8825.0

The device looks  very simple....... and it looks like a few  companies may be investing in the idea.

I  have only got to page 10 so far..

I see no  sign so far that that anyone there has expermented  with impulses.
First tests  ( on the link above ) indicated that the circuit  seems to have some sensitivity  to polarity..... connecting the  polarity one way  gave 1V connecting it the other way gave 1.5 V
My hope is that  this  effect can be used  for rectification  eventually.

I have built a couple small test coils  to see what happens.

I have made 2 coils that are pretty much identical
Same number of toroids .......same number of windings .

I have placed  one  coil on top of the other  and put  very small NEOs  in between  each set of toroids.
The magnets are small.  1/8th  in diameter and  1.16 in thickness
If I do not  get  impulses through the circuit  I can start taking magnets out ........one by one.............or add larger magnets as needed.  This system should  be almost infinitely tunable.

I am  thinking  that the magnets should  be strong enough to block  the sign wave part of the signal.........but weak enough to pass most of the impulses.
I am hoping that the magnets  have a sharpening  effect on the iompulses rather than a dampening  effect..........This is just a hope ........I have not started testing yet.



I will  be powering this  circuit  with a JT  that is  strong enough to light  a CFL.
I will start  with it in series with a load.........but hope to make it the load eventually.

gary

Edit
In the top picture the shiny things between the  toroids are the magnets......... those magnets are all that is holding the 2 coils together.