Joule Thief

[kb24]

Yup, i connect caps exactly like in the diagram.. but one thing i notice is that is if i use more cell plus capacitors, the light wouldnt dim.. if i only use one single cell plus capacitors, i can notice the light dim..

Yup, i have try by lessen the winding.. it works..  gonna get my fuji circuit on thursday.. That time will try with my EB.. do u think i can light up CFL with 12V from EB? curious to know.. lol

[resonanceman]

Yup, i connect caps exactly like in the diagram.. but one thing i notice is that is if i use more cell plus capacitors, the light wouldnt dim.. if i only use one single cell plus capacitors, i can notice the light dim..

Yup, i have try by lessen the winding.. it works..  gonna get my fuji circuit on thursday.. That time will try with my EB.. do u think i can light up CFL with 12V from EB? curious to know.. lol

KB

just  play  with the windings for a while
I suggest focusing on the  primary first.
play around  with the number of winding ......take them  off 1 at a time  and record what voltage you get  from your secondary ...... the voltage should  go up as you take windings off........up to a point.......once  you reach the best voltage  you can get  the voltage will start dropping as you remove windings.
This is called tuning the primary.
Once the primary is tuned.........you can add a few windings  at a time to your secondary ........at some point the voltage will stop  going up .......that is your upper limit for that particular  voltage with that particular toroid.
I do  not know what kind of toroid  you are using.
if  you want to make a JT that will light  a CFL I would  suggest  using a large toroid  or the core from a flyback  transformer.
It  is  hard to light a CFL with a small toroid........ you run out of space for  your secondary windings.

The fuji  will probably be the quickest and easiest way to light  a CFL ......I would try with a battery first.......then with your earth battery


gary

[kb24]

KB

just  play  with the windings for a while
I suggest focusing on the  primary first.
play around  with the number of winding ......take them  off 1 at a time  and record what voltage you get  from your secondary ...... the voltage should  go up as you take windings off........up to a point.......once  you reach the best voltage  you can get  the voltage will start dropping as you remove windings.
This is called tuning the primary.
Once the primary is tuned.........you can add a few windings  at a time to your secondary ........at some point the voltage will stop  going up .......that is your upper limit for that particular  voltage with that particular toroid.
I do  not know what kind of toroid  you are using.
if  you want to make a JT that will light  a CFL I would  suggest  using a large toroid  or the core from a flyback  transformer.
It  is  hard to light a CFL with a small toroid........ you run out of space for  your secondary windings.

The fuji  will probably be the quickest and easiest way to light  a CFL ......I would try with a battery first.......then with your earth battery


gary

Yup, thanks for the advise.. The toroid that i have been using is the one i get from the car audio amplifier.. can it be used?

[Pirate88179]

i have try by adding the different size of caps( 1uF, 47uF, 220uF) on my joule thief. My EB + JT without caps can light up 1 led full intensity. But after i add on caps( 1uF, 47uF, 220uF), the light get dimmer. So what the problem with my JT? Is it something wrong with my toroid?

My toroid consist of 22 turns and 19turns.. Is this correct?

Adding caps doesnt effect on anything. So what is the possibility for this?

I am talking supercaps here....like 10 F, 50F and now I am up to 650Farads.  These larger Farad sized caps made all of the difference for me as they took the pulses and spikes and stored them as usable energy.

Bill

[crowclaw]

@Kb24,
The more  cap's you add into your circuit the greater the current stored... you add all the values together. Make sure you connect them as Bill suggested all in parallel.
You may find that initially due to the total capacitance value they may take a while to charge up. The cap's impedance will be a lot lower so the JT's ability to provide an adequate charge may take a while to overcome (depends on you JT design) as the cap's take on charge the impedance will rise until they are fully charged. Final point... make sure you have polarities connected correctly i.e. all +++ together and all  - - - together.  regards Merv