Joule Thief

[jeanna]

Yeay!! hooray!

[EDIT::]  1K resistor was too much, i used a 500 Ohm resistor and it turned on right away....
possibly my red  LEDs have a lower resistance than the base circuit.     

mmm yes, reds are different.
One thing I have learned is that the bright whites are more like fluorescent bulbs with a led accent than real leds.

YAY!! i got it to work!  - changed all the resistors, now i have 12 working joule thiefs, of varying core types. it works with cylinders, and even steel rings work with smaller wires and more turns.

Ha you sound like me. I have a couple dozen of these things and they all are a little different.

i might try a simple Nail next....

oddly enough im reading only 1.3v across the diode.

.6v at the base resistor.

drawing 40ma

This sounds right.
The flyback is what is doing the work and making the magic.

Therefore, to take advantage of the flyback,

Make a secondary and use it to turn on your leds.
The red will need to go for this. It is probably going to go out anyway, but for now, just use the basic led spot to test your circuit to be sure it works.
The amperage draw will decrease as you add more leds to the secondary. (cool )

Once that is finished, start to explore the different kinds of secondary and primary/secondary configurations that have been discussed in this very long thread.

It (this long thread)  will be a valuable resource for you from now on.

Congratulations Sm0ky2,

jeanna

[innovation_station]

well

i have decided to build my next unit .. 

i have like 10 rings putting out over 200-300 vdc in a cap ...  so im sick if winding configs for now .. i need to do something with them

first thing im gonna do is use  those 3.6v  cordless fone batteries that charge in 20 seconds... i will put 8 of them in a string to get close or over 30 vdc ... then i found a big cap from some old junk boards the cap is 35v 6800uf i want to cascade charge the batteries in like 2 min or less then have that cap able to dump at my lesure ... maybe through a burnt crystal diode spark gap

i do not have all the darn skills to whip it up like most the rest of you have .. so its trial and error for me 

but i got the KICK    and when you all fully understand the kick ... youll all see what i have learned  lol



the kick is far more than free engery lol

ist!

[resonanceman]

   

YAY!! i got it to work!  - changed all the resistors, now i have 12 working joule thiefs, of varying core types. it works with cylinders, and even steel rings work with smaller wires and more turns.

Smokey

WoW .........  you  have been busy




It  took me  at least a month   to get  all  those  different  JT  cores  running .

I am looking forward to  seeing  where you  go with this  next



gary

[Mk1]

@all

Hi everyone , you guys are keeping busy , i just finish catching up .

Ist nice spark , and you still managed greatness from failing unit ... keep it up !

Nice videos Jeanna , may i say you do have a nice voice , great work again .

Welcome Smokey , come on guys lest not get carried away form a misstep, anyway we all know there is everything but hoaxes around here , so really no harm ...



Again try pulsing 2 or 3 cores at once , then you can put a core dead short on a electrolytic cap and still get the high spikes from the other cores .


Keep the good work everyone .

I also made my catch up on you tube , some really interesting links

first lid motor  with a jt pulse motor running from a cap and hall sensor switch .
http://www.youtube.com/watch?v=5WK8UEXOK-I&feature=channel_page

And also stark he has more jt video and started grey tube testing .
http://www.youtube.com/user/TheIronStark#play/uploads

Mark

[resonanceman]

its all fun as long as we learn in the process..

im learning to figure it out ...  as i go

plus im used to winding coils ..  so it dont bother me ...

my chargers seam to work well even if i cant get the output to light a floro

easly they still rock the batteries .. 

the shift i could build if i ever get my hands on some super caps 

ist

im on another charger ...  now im chargeing a cell fone battery and burning a jumbo super bright led 10mm and every 15 - 20 min it drops from 4.28 to 4.27 its only a 3.7v but the darn charger recharged it a bit much lol


this is a diffrent charger coil configuration im useing .1uf 250 v non polar cap and a 4401 db107

its putting out 300 and something volts.. ill build this into a charger battery pack too

it sure is compact ... 

in watching this set up it apears to be more like 45 min or more b4 the battery drops .01 v lol 

it may be ballanceing and may not draw from the cell fone battery until the driveing battery goes week 

i did not mesure the consumption on the led but this is a big one ... the last time i did this same test it was a tiny one its probally drawing at least dubble the power from the battery last one was 3.7v at 32 miliamp 2 mm led ill check the miliamp on the led


odd i cant get a reading on the draw  the led sure is bright .. tho ..messing around for 15 min with out being charged it only droped .01 v

i just changed the aa in this unit its now up to 10.96vdc last one was dead ..

just topped 11 v 

and the other thing powering the 10mm led has not droped below 4.26 v yet  its been 2 plus hours ....

IST

I am  working on  a charger right now too .

Do  you have  a way to  prevent  overcharging yet ?

Once  we get a little  power  out of these chargers   I would  think   we would need to find  a way to make sure  that  we are not  frying our batterys .


I have thought of  using  the   natural resonance  ...... I have found that  the power is in a narrow  band .........if this band could  be  tuned for  the right   voltage ......the max power would happen only  when the  battery  drops  to a certain point . ........  If  it  drifted  out  of  resonance  as the  battery   reached  full charge it might be  self  regulating . 
 
Any thoughts about this ?



I am thinking  of  starting  a new thread  once   I am  ready to  post  about  this  charger ...... it  does not exactly fit  this  thread   because it will be 12V
I also think  that   we   need a place for  projects  we   do   using  JTs

gary