Joule Thief

[Pirate88179]

http://parts.digikey.com/1/parts/1481978-ferrite-toroid-102mm-od-b64290a0084x830.html

Above is a link to a supplier of 4" OD ferrite toroids.  They are about $50.00 ea.  I wonder how much better bigger is in this instance?  Would this be worth it to try?  I can't afford it now but I can add to my wish list.  They also have many other sizes listed there.  This one is the largest I could find.

Bill

[WilbyInebriated]

http://parts.digikey.com/1/parts/1481978-ferrite-toroid-102mm-od-b64290a0084x830.html

Above is a link to a supplier of 4" OD ferrite toroids.  They are about $50.00 ea.  I wonder how much better bigger is in this instance?  Would this be worth it to try?  I can't afford it now but I can add to my wish list.  They also have many other sizes listed there.  This one is the largest I could find.

Bill

using a larger core for your transformer will give you greater energy storing capability. if you're not driving larger tubes or multiple leds it's not really needed. always worth a try bill, $50 is pretty steep. i would look inside cast off switch mode power supplies like from a computer. there is usually a pretty big toroid in those, around 1 1/4" od and often already wound up bifilar. would at least give you an idea of how better bigger is without dropping half a benjamin.

[electricme]

@bill
I like your new torid, nice, looks like it may have come out of the VGA plug lead off a PC monitor???

A 4" torid would take some beating in the amount of energy it could provide, with this one bill you could wind on many seperate windings, but this size could really be something if you got any fingers dangling around loose wire ends ha

I'm tired, its 10.44pm but I got to answer another post as I 4 got what I got to say, got 2 go n take a lookse back.
jim

[electricme]

@MK1
Yep just about any NPN and PNP will work, as long as the VCC is within range and you keep an eye on the base current draw. That said I dont know nothin. 

MK1 I can verify your dual torid is indeed fact as I have managed to duplicate it, only difference I have not got around to adding LEDS to each output winding, but my frequency meter shows output on both seperate windings.

OK @all
I got my second JT working, somehow I managed to connect it up back to front, I had a break from it all, re-check my mouse traps (I'm winning, its a war here, de mouses army v just old me, an I is winning, ha ha. Losses mouses = 7 me = cheese)

OK back to work, a few posts back I posted photo0192.jpg, well I put it together and this time it works, a nice very bright (blinding) white LED is showing itself off.

See photo0197.jpg

The frequency meter shows both seperate output windings with 14.00 KHz
This is on both seperate windings.
see photo0198.jpg

I believe I am energising 2 seperate output winding/coils by just 1 Jule thief.
Next step is to solder some LEDs to each seperate output and see how that goes.
After that, remove the LEDS and solder in 2 seperate bridge diodes, and see what happens then.

I also believe we could energise more than 2 output windings, bigger torids, more windings etc.

OK all I'm off to bed its now

jim

[innovation_station]

bigg toroides are good verry good.... bigger the better 

some one BUY ONE ...... please....

i will help you with a little trick 

ist!!

i may have my investor order a few for me ....

apaerntly they make bigones in trontro.... close to me .... 

thane provided a link a while back

be it knowen high speed switching is not nessasary....  ok it is right now cuz your coils are not correct    even in the cam flash units 

i have far better ways 

how do i KNOW your coils are wrong .....  cuz your battery will go dead ....  even with out recovery to recharge the source it will take months to drain a battery when your coils are correct