Joule Thief

[crowclaw]

Thanks Bill, looks very much like a Buck converter...a lot of tech in that little circuit. Crow

[Pirate88179]

I made a video of my little surplus flash circuit handy box driving the gutted Cree 60w LED.  I was able to take it apart, remove the driver circuit, and put it back together.  What a great light this is!  I already loved it when driven by the mains but, I just put it into one of my other JT box lights that needed another dead battery because the LOA bulb was getting dim and this thing lit up very brightly.  We will have to do more work on these.  Thanks once again Tyson.

http://www.youtube.com/watch?v=x8O9r085l0M

Bill

[ColoradoSpringsFilms]

Greetings,

I've recently discovered your youtube channel and am very impressed. I was wondering, you mention that you found this surplus flash circuit on electronic goldmine; do you know where it is listed on the site. Could not find it. Anyway great vid, in the process of replicating.

John

[Pirate88179]

Greetings,

I've recently discovered your youtube channel and am very impressed. I was wondering, you mention that you found this surplus flash circuit on electronic goldmine; do you know where it is listed on the site. Could not find it. Anyway great vid, in the process of replicating.

John

John:

Thank you very much, I really appreciate your saying that.  Welcome to the forum and the Joule Thief topic.

Yes, those surplus boards WERE available but sadly they sold out of them.  I was looking for more last week too.  I purchased 30 of them while I could get them.  I was thinking of making the required modifications to them and possibly selling them on my website.  That is the only problem with surplus stuff, when they are gone, they are gone.  In the early days, we used to be able to get (from goldmine) five 1" toroids for a dollar. (USD)  That was a great deal too and a lot of JT circuits were built using those.  It didn't take too long for those to sell out.

You can still buy a camera...use it for photos, and then modify the board or, do what I have done many times...buy the camera and tear it apart without using it.  If you go this route and need some help. just let me, or someone else on here know.

Bill

[ColoradoSpringsFilms]

Bill, greatly appreciated

This is my first time on the forum here and very impressed at the content. Me, being only a junior in high school, find all of this material very interesting, and just around now I've been delving into some joule thieves. Previously I was glued to comparing the two waveforms of Longitudinal magneto-dielectric and Electromagnetic, and their properties. But, anyway, if I need help on the circuit, I'll give it a post, haha. And I guess I'll see if I can find something on earth batteries. I wanna get started on that and then doing some modifications like you showed with your fuji circuit. Any tips on where you got the caps?