Joule Thief

[kb24]

KB


All of those caps should  be enough to get your JT working right.
Are you sure you are hooking them up right?
Can  you post a picture of it with a cap hooked up?


gary

I put another clip from my EB positive to longer side of caps and negative EB to shorter side.. Is that correct?

[kb24]

actually, my jt consider been working fine even without caps. I can power up 1 LED using 1 unit of my EB. Normally i need 3unit of EB to power up 1 LED.

So what is usage/function of adding caps into it?

And what improvement should b make in order to power up CFL? i have 9W cfl with me now.. hopefully can power it up

Thanks

[The Observer]

Kb,

You said,

Actually, my jt consider been working fine even without caps.
I can power up 1 LED using 1 unit of my EB. Normally i need 3unit of EB to power up 1 LED.

So what is usage/function of adding caps into it?

And what improvement should I make in order to power up CFL?
I have 9W cfl with me now.. hopefully can power it up

Thanks

There are 3 main ways to light a CFL with a JT that I am aware of... ( the more experienced can add to this list )

      1. Use a "large" Ferrite Core (Torroid) of High Magnetic Permeability with lots of turns.

       2. Modify a Disposable Flash Camera Circuit (Look up Gadgetmall Camera Circuit)

       3. Buy an Auto Ignition Coil, find it's Resonant Frequency, then tune your JT to resonate I-Coil (output from I-Coil lights CFL)

Best of Luck,
                    The Observer

[kb24]

Kb,

You said,
There are 3 main ways to light a CFL with a JT that I am aware of... ( the more experienced can add to this list )

      1. Use a "large" Ferrite Core (Torroid) of High Magnetic Permeability with lots of turns.

       2. Modify a Disposable Flash Camera Circuit (Look up Gadgetmall Camera Circuit)

       3. Buy an Auto Ignition Coil, find it's Resonant Frequency, then tune your JT to resonate I-Coil (output from I-Coil lights CFL)

Best of Luck,
                    The Observer

Thanks for the info.. i will be getting my fuji circuit on thursday.. hopefully can work..

[resonanceman]

Here i attached my JT(sorry for bad drawing).. I didnt use any resistor. and i try adding caps but it didnt have any effect.. but it make my led dimmer.. Is my toroid connection correct? Plz give some comment..

Thanks

KB

If  you can light up any LED  with your earth battery then the JT connections are right.
You might  try expermenting  with the number of windings  of both your primary and  secondary.
Try  adding  a few  windings to your secondary .
Sometimes removing a few windings  from the primary can raise the voltage too.


I added a capacitor to your drawing 


gary