Joule Thief

[WayneJT]

Hi Guys

Thank you Crowclaw and Jim for the info regarding the cfl in strobe mode, however I did not manage to stop it from flickering, only option was to cut out the electronics from the cfl like was mentioned in this thread, it would have been nice to get off the shelf cfl's to work without the mod, but never mind I now have a 7w 240v cfl running from a kodak AA board with a modded cfl, its been on now for 14 hours running from a D battery, and makes a great night light.
Will post a pic of some of the other night lights I have been working on as someone out there may like to try a few designs, the little dude meditating has a RGB Led inserted into the candle on his lap which is really cool at night,this is a basic JT with AA and runs for about 3 weeks,  the clear tube with 2 blue leds is also a basic JT and is something I copied from one Bill designed sometime ago,it runs for just over a week, I should have reduced the number of turns in the coil on that one, as the light although has a nice effect with the hot glue covering the light seems to fade slightly in the centre, next one will be only 3 coils.
The last one is also a basic JT and has a bright white led, it lasts over 3 weeks on a AA, it has a blue shottie glass covering the led and an inverted candle holder over the top to diffuse the light, very nice at night.
I think the cfl's will be the way to go as far as light output is concerned, it is so far the brightest, but being a cfl it will most likely not last too long, I am doing a time trial on it now, after 14 hours D battery with no load is at 1.345v, this may last longer than I expect.

Wayne.
 

[twinbeard]

Hi All,
I have been fooling with some variations of resonantly tuned JT circuits driving small exciter/magnifying transmitter towers.  I shot some video of two of these running concurrently, with a crystal radio set in between, the output of which is then fed into my stereo amplifier.  Interesting sounds abound:

http://www.youtube.com/watch?v=Ze1Dzjo-Zjs

Cheers,
Twinbeard

[FreeEnergyInfo]

NO BATERY !!!!

http://www.youtube.com/watch?v=feRdjDglbq0

[tommy8482]

Hi,
This is my first post. I read all the posts in this thread and I want to present a diagram and some photos.

I want to ask for help in finding the type of transformer or coil.

[xee2]

I want to ask for help in finding the type of transformer or coil.

A very creative circuit. It looks to me like you have two Joule thiefs running in parallel. If so, you should be able to remove one of the transistors and the circuit should still work. If that works then the input side of transformer is equivalent to a Joule thief toroid (two coils with a common end). In that case there is a second set of identical coils on the transformer you are using using for he second Joule thief.