Joule Thief

[Mk1]

Mark,

Yes it makes perfect sense to me now. I built my JT with the first LED soldered directly to the transistor and coil. The way I understand your idea to work is that I would simply remove the LED from my JT circuit and then add a 1 wire 1 turn pickup coil on the same toroid. And connect that to my LED bank to see how many LEDS I could run from that one pick up coil.

At that point I would add another pick 1 wire 1 turn pick up coil and try adding more LEDS to that.

Is that correct?

Thank yo!

Yes it is !

Mark

[xenomorphlabs]

@ jadaro2600
   

Is the toroid a conductor?  Does it conduct on the inside?

Google : Eddy current

The coils also induce electron movement in the core material (considered as core loss)

[jadaro2600]

@Mk1

I am using the bifilar coil. I just tried it again with 1 and 2 and 3 turns and just the LED tested each side of LED and it will not light?

Any ideas?

Bifilar for the two driving coils only - collector coil is a stand alone.  This is where you wrap one two or three coils.  Any load on that coil will effect the gains on the other coils.

[TheNOP]

i know why it behave like that, i simply didn't made the joint with what IST was talking about.
thanks

overdriving the base is not a real solution.
how can we limit the base feed when battery is full and amplify it when it get low.

the basic way i know would be a zener diode but that might screw up everything.
try your zener diode between the base and the - side.
using it as a variable resistor like you did can't really solve that problem entirely either.

[jadaro2600]

@ jadaro2600
   
Google : Eddy current

The coils also induce electron movement in the core material (considered as core loss)

Gosh! ...I'll just have to scrape the paint off one and check.  ..and it doesn't appear to conduct.

Next time, to help telling someone to Google it appear less lazy and rude, you should just craft the search url for Googling it like this: http://www.google.com/search?hl=en&q=Eddy+currents&btnG=Google+Search&aq=f&oq= that way it makes it actually look like you've helped.

Telling someone to Google it is like telling them to go to the library ...want to hit it more on the head - just tell them to shell-out 40k for a college education.