Joule Thief

[jeanna]

A couple of pix
These show the safe way I am doing this.
I will not grab the ends because it is all so stable.
the diode and where the cap and stripe are.
The scope showing over 1000v, 2.39khz
That it is quite a capable jtc for a cfl of 10-20w size... more probably.

I am afraid these components won't do, or something.
They are both rated for 1000v which means plenty.
They shut it right down. Close it off.

@all, thanks for your help,

jeanna

[xee2]

@ jeanna

You do not need a big capacitor to light a filament bulb. I made this video of a filament bulb being strobed repeatedly by koolers circuit. This is using a 0.11 uF cap that is being charged to 400 volts and then discharged through the bulb. You should get the same brightness if you charge a 0.1 uF capacitor to 400 volts and then discharge it through a bulb. But it will only be a blink. This bulb is being blinked over and over at a rapid rate.

http://www.youtube.com/watch?v=j3B9yIwBlpM

I am getting VERY frustrated with this editor. It changes what I have written when it posts. I will try to correct it. - done.

[resonanceman]

@jeanna I should have phrased my toroid question differently... Is too much permability possible?

I guess the other question was also phrased incorrectly... is it possible to get the same performance  by traditional means or is this unique to the JT's operation. Is there another way to fire cfl on a AA battery for the same period of time?

Thanks

Unzapped

I agree with what Jeanna  has said  about toroids

I would say  other shapes can be used for JTs  but  the toroid  is very efficient
I  read somewhere that it is so efficient because it  has an even and  continuous path  for the magnetic flux

I would  say that the second  best  core would  be  an E core .......I have been suprised a few  times by how  well a  small ferrite core transformer did  when it was wired up  as a JT coil .

As  far as ferrite  or other  materials  ,  I think  ferrite is by far the best  for the JT.
I would say that  for higher power  powder core toroids may  work  as well......but  JTs  are low  power.

From my experience  a powered  iron  toroid takes alot more primary windings  to get it to work .
Most of the  stuff here involves large secondarys
If  your primary takes up half the toroid.... there is not alot  of space left to play with .




Do you know  if your fried can do bifilar windings ?
2 wires  wound  like they were one?
Pretty much all my JTs  are bifilar .



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I am  still working on my Jeanna light

I seem to be comming full circle....... I am back to my same old flyback and feedback experments ......only this time with my candy cane coils

I have got  some fairly  good results with my 90 LED array.........but I don't  have enough  toroids  to get the voltage to light a CFL


gary

[jeanna]

@ jeanna

You do not need a big capacitor to light a filament bulb. I made A of a filament bulb being strobed repeatedly by koolers circuit. This is using a 0.11 uF cap that is being charged to 400 volts and then discharged through the bulb. You should get the same brightness if you charge a 0.1 uF capacitor to 400 volts and then discharge it through a bulb. But it will only be a blink. This bulb is being blinked over and over at a rapid rate.

http://www.youtube.com/watch?v=j3B9yIwBlpM

Well that is pretty darn good. A little faster and the eye will not detect the flashing!!

I am not using koolers circuit. I am just starting with 1000volts. 2.3khz.
I do not get any voltage when I add the diode and cap.
It is totally strange to me.
I am pretty sure the diode is in right. isn't it?

Maybe I need a series inductor instead of a diode.

....
thank you,

jeanna

[xee2]

@ jeanna

I do not get any voltage when I add the diode and cap.

The voltage on the capacitor is DC. Are you using the meter set at DC?