Joule Thief

[Pirate88179]

  Thanks Bill: 
   I've never seen the green toroids, but I have used the orange, and smaller black ones found in the cfls. They seam to work ok. As well as many different yellow pc types. Yes, they all work, I guess it all depends on what anyone wants to do. But, as I have used them, I still recommend not to use the iron powder ones even though they do work to a usable degree. I had a bunch of the yellow toroids around the house, so... I could not resist.
Pictures below of are iron powder cores, regular Jtc, and they are still working two years later.  Not bad for the price... Zilch!
                                                                                  NickZ

Nick:

You sure can't beat zilch, ha ha.  We all know that JT's can be built from many materials but I guess I am just used to ferrites.  I have never seen orange, that is a new one on me.  But if you can make them work, more power to you.

Bill

[NickZ]

  It was actually Jeanna that had mentioned about the smaller orange toroids cores from the cfls, that's where I had heard about them and decided to give them a try also, as I had some dead cfls around.  Who knows what they are actually are made of,  but they seam to work, and were free.  So, for people living where you can't get the ferrite cores, the small toroids from from the cfls do work, and some of them may even be ferrite.  And may be of higher permability than the yellow ones from the pc power supplies.

[Flux4Energizer]

Hello guys,

I just uploaded my latest project.
A Joule Thief Battery Charger 
I hope you guys can give me tips and maybe some ideas on how to further improve the circuit.
My last joule thief project was over a year ago and this circuit is an improvement of the circuit i posted 2 years ago.

The video is on youtube (here's the link): http://www.youtube.com/watch?v=7aof3acSpfc

The circuit is very simple, but working very good.
Well hope to hear your replies and ideas and/or tips.

Regards,
Flux

[Ganzha]

For information only - inventor of Jule Tiff is inventor from former UssR - this schematics was publised since 1970 in russians amateur zines!!!! Look carefully!

[Pirate88179]

The inventor of the Joule Thief is Big Clive,  He also named the circuit.

Bill