Joule Thief

[resonanceman]

Well if there is a self charging unit please do include me in would make an excellent night light...

Or maybe the manufacture of lite brite may want to create a unit with your device there are tons of applications oled tvs that run forever off of batteries muahahaha ok lol just joking there but anyhow I don't see where to go with this other then night lights which is good enough for me.

What is the max time anyone has ran led lights off of these units to spare me the long route?

Infringer 

Are  you just looking for   a small  light  that will run a very long time ...... maybe  many years ?

That is  pretty simple .

The  JT is all  about  flyback ...  ( BEMF )
I read  somewhere that  a flyback pulse can be  3 times the  original  voltage .
With Jts  we  can't   tripple our voltage   with  one pulse ........but  we can add   up   our gains

I   have been  using my  LM   coils    wired in series   with a JT coil  to buld   up  bigger   pulses .
I  start  by connecting   several   LM  coils  secondarys     in series  with the output of my JT
I use the secondarys because   there is more inductance there than in the primarys
The   primarys   of these  coils  can be   hooked    up in parrallel  to provide  feedback

A while  back   Jesus  made  a   self charger .......   it is a great help  for this ......    it has  4 dioded and a cap .......   just connect   all your feefback wires to   one side  of the  cap or the other.

Most of my expermenting   I  use an array of  diodes  ...... the first time  I  got  a self charger to work I was running  a 60 LED array  ....... the array was lit  brightly and   both the battery voltage and  the  output voltage  were going up ........  It  took  9  extra coils  to  achieve that .

My best so far ......I have  lit  up a 90 LED array  to full  brightness    and  self charged    with only  4 extra coils  ......
Still  working on  getting is smaller

 

I said  I  start  by    hooking up  the secondarys   ...... you can only  hook up  so many secondarys  before   you choke  your whole  circuit ........so  when that happens  take  one or 2 off .....and  hook  some  up  by the primarys    ( less  inductance ) .........the secondays  provide   better feedback  this way.

In  general ......  flyback seems to provide  higher  voltage ........feedback   helps  with the power .

To make   a  LED or  2 light up for months   you should only need   1 or 2 extra  coils ....... 


Happy JTing 





gary

[innovation_station]

ill share something with you all to try to help tune you in to how i have seen the universe at work ..

just now i was digging in 1 of my boxes of things i have collected over time and built ... 

and i pull out an older tpu design ... and for some reason .....  lol   lol   it is STUCK TO THIS FLY BACK UNIT ... ILL POST THE PIC....

but youll love it ... this kinda thing happins to me ALL THE TIME .. 

anyhow it was the iron garden wire hooked right around the transistor after the shocky diode and cap b4 the tv fly back ...


lol lol lol 

this place earth is a misterious place ..

ist

[resonanceman]

Infringer 

Are  you just looking for   a small  light  that will run a very long time ...... maybe  many years ?

That is  pretty simple .

The  JT is all  about  flyback ...  ( BEMF )
I read  somewhere that  a flyback pulse can be  3 times the  original  voltage .
With Jts  we  can't   tripple our voltage   with  one pulse ........but  we can add   up   our gains

I   have been  using my  LM   coils    wired in series   with a JT coil  to buld   up  bigger   pulses .
I  start  by connecting   several   LM  coils  secondarys     in series  with the output of my JT
I use the secondarys because   there is more inductance there than in the primarys
The   primarys   of these  coils  can be   hooked    up in parrallel  to provide  feedback

A while  back   Jesus  made  a   self charger .......   it is a great help  for this ......    it has  4 dioded and a cap .......   just connect   all your feefback wires to   one side  of the  cap or the other.

Most of my expermenting   I  use an array of  diodes  ...... the first time  I  got  a self charger to work I was running  a 60 LED array  ....... the array was lit  brightly and   both the battery voltage and  the  output voltage  were going up ........  It  took  9  extra coils  to  achieve that .

My best so far ......I have  lit  up a 90 LED array  to full  brightness    and  self charged    with only  4 extra coils  ......
Still  working on  getting is smaller

 

I said  I  start  by    hooking up  the secondarys   ...... you can only  hook up  so many secondarys  before   you choke  your whole  circuit ........so  when that happens  take  one or 2 off .....and  hook  some  up  by the primarys    ( less  inductance ) .........the secondays  provide   better feedback  this way.

In  general ......  flyback seems to provide  higher  voltage ........feedback   helps  with the power .

To make   a  LED or  2 light up for months   you should only need   1 or 2 extra  coils ....... 


Happy JTing 





gary

I thought  I should add that even though the power is  there for    a self charging  system .......it is still not  a cut and  dry situation
The  problem is  resonance .
There is  plenty of  power  when   the JT is in resonance ........the problem is ..... the efficiency  drops when it drifts out of resonance .......so .....to keep  it  running  it has  to be adjusted  slightly   every once in a while . ....... just enough to get it back into resonance .

I am working on   ways to  keep  it going on its own .
The  gas discharge tube that Xee found may be a way to prevent  over voltage ......  but  I am looking  for  other ways ...... spark  gaps change  over time .......and make  radio  noise ......so I  hope to find something else . .....


gary

[sm0ky2]

mmm yes, reds are different.


jeanna

out of desperation/frustration i had to get 'old school' on this thing, and went through analyzing every piece of the circuit.  I discovered that the transistor wasn't comming on at all, it was just bypassed by the lower ohm  LED path.

my simple V-check across the legs was decieving me....

it was good to learn that the base resistance needs to be lower than the LED path, this may help others in the future if they try to use these hardcore LED's and get stuck like i did.  - which im probably going to do away with, because their current draw is too much to operate from my Earth Battery (what got me into the JT to begin with)..

i guess i'll pay Radio-Shack a visit and pick up some small LEDs
( or maybe just pimp out my EB some more....)

jeanna,
when you said to use a 'secondary' and run more LEDs, did you mean a "second secondary" ?? like a separate coil around the original JT, to pick up more juice?

and if so, is this ran in parallel with the first 2 coils? or not connected to them at all?

[jeanna]

jeanna,
when you said to use a 'secondary' and run more LEDs, did you mean a "second secondary" ?? like a separate coil around the original JT, to pick up more juice?

The bifilar is actually the primary.

It is drawn as though it were a primary and secondary. I assume that is so it can be made clear with the dots that the thing is center tapped.

The secondary is an additional wire that wraps through the toroid a bunch of times and which is not electrically connected to the joule thief.
It is magnetically connected, though.

So, it is the magic part because it is the transformer part. Whatever the primary pair does the secondary will respond magnetically, which makes the electricity bla bla.

So,
plan to have between 4 and 6 turns for each led you want to light. There will be no extra draw, and most of the time there will be less draw if you only use the secondary to light the lights.

On my clipboard as I write this, I have a link I just picked up for jesus who just asked me this same question on the ac page. I will drop off a copy for you too.

Have a look
This is me lighting 6 leds.
The berry has 40 turns. You can see the 6 leds from the secondary and the one from the primary. (often that one will go out, but I take it out now because it uses extra power.)

http://www.overunity.com/index.php?topic=6942.msg161452#msg161452

jeanna