Joule Thief

[xee2]

The first testing with my new coil is disappointing. The output voltage is only a little over 1000 volts and the CFL is hardly any brighter than with the 80 turn pickup coil (but it does seem a bit brighter). I need to figure out why the output voltage is not higher.

[Pirate88179]

Xee2:

Welcome to my world.  Your light (given the differences in exposures from cameras) appears to be about as bright as mine.  Remember I used 2 toroids stacked together so when I wound 330 turns (give or take) I have a lot more wire there than on a single toroid. 

When I see Jeanna's, and others photos, i am thinking, why did I use 2 toroids and all that wire as this does not seem any brighter, and maybe not even as bright, as what they are doing.

So, at this time, I can not recommend using 2 toroids as I have not seen a huge gain from this, or any gain really. I am not done tuning yet but, I don't see it being a big breakthrough at this point.  I was just glad to be able to be shocked by it when I was not before.  But, maybe this lower freq. is not what we want?  I would guess that the lower freq. will allow longer battery life as it is not turning on and off so fast but, I really don't know.

Later, when I get back from a job, I will continue with my tuning and see what happens.  I don't expect any order of magnitude increases though.

Bill

[tysb3]

now climbing to 1.276V.
the battary NI-CD AA700mAh recharge itself !!!!!!!!!!!!
I cant belive my eys. all parts from tv, from skip. I have only multimetter, breadbord and soldering tools.
I cant ajust properly it, but its gooooooooo

[kooler]

tysb3
i think i might build your circuit.. if you don't mind
i tried the same feedback on my second stage of my circuit .. but it puts out to much
it over runs the rest of my primany circuit.. burning the tansistor
i like what i see on your circuit.. what r the cap values at the feedback...
thanks

[tysb3]

@ kooler

from picup coil capacitor is M .55J,
from collector 10.0 mkf

its need to play with this caps to inproove JT

transistor is D1885 from tv line transformer