Joule Thief

[resonanceman]

pardon my lack of memory but didnt this forum try their hand at making their own ferrite torroids a while back? i am interested in trying to make a ferrite disk for magnetic experiments. if anyone recalls/knows about this subject would you mind PM'ing me or replying to this thread if bill doesnt mind?

thanks

Artic_Knight

There has been talk a few times about making some toroids by hand......I do not  remember  anyone actually  getting it done....

It is on my list though.

I have the Fe3O4 ( black iron oxide ) and  epoxy to use as a binder.

I just need  to make  a mold.

I do not expect to get great results........after all it will be a powdered iron toroid ...... not ferrite.
My main  reason for getting the  iron oxide was for other projects.

I also have some bismuth on the way for other projects.......but a bismuth  toroid sounds interesting.......and  a bismuth toroid  laced with iron oxide may  be worth a try too.

gary

[nievesoliveras]

There is one guy that makes toroids with wooden molds on youtube.
Maybe this will help.

http://www.youtube.com/watch?v=NZF1FYaEdqc

Jesus

[resonanceman]

There is one guy that makes toroids with wooden molds on youtube.
Maybe this will help.

http://www.youtube.com/watch?v=NZF1FYaEdqc

Jesus

Jesus

Thanks.......I have seen that.

I already have decided on how  to make  a mold.
I posted  it  a while back....... reply 11 on the bismuth JT thread.

Silicone rubber is  to soft  for a high precision  mold.....but I see no reason that a toroid needs high  precision.

I silicone  rubber mold can be used for many materials.......including bismuth and epoxy

a layer of  fiberglass cloth  can be used in the bottom of the mold to increase its durability .

The mold  would be flexed  to release the finished  toroid .... the mold should  be good for hundreds of toroids.

I  mostly just have to find the time to get it done..........I have all the stuff


gary

[conradelektro]

Bottom line, a good balanced design, that's not too complex, but mostly with the idea of running an L.E.D.

Hello mrbr00k5 !

Attached please see a Joule Thief circuit that works very well for me. It was posted by a person calling himself "Groundloop".  I added a few comments and hints based on my experiments.

Greetings, Conrad

[Artic_Knight]

bill or anyone

ive seen a few of you using the led christmas lights and lighting them from your JT and flash circuits, do you know what the arrangement of the leds are? are they in series or parallel? and did they need a special circuit or transformer for normal (pre JT) use?

im looking at making some custom under cabinet lighting i will post pics when i get it done and note my setup.

thanks!