Joule Thief

[TheNOP]

due to the efficientcy of solar cell, i don't think it can close the loop.
but it is a sure way to recycle some of the energy used to light the neon or leds.

[jeanna]

@ jeanna

Why don;t you go back to this circuit and change the base resistor from 1K to 10K and measure the battery current. You should still have enough voltage from the secondary to light some LEDs. Use a cap across the base resistor.

Yes,
This is what I did all the tests on yesterday but in a more cursory way. I changed the base resistor. to 10kVR and checked everywhere in the middle. All I ended up doing, as far as I can tell is dimming the lights by using the higher resistance. It always had a cap. I can do it inch by inch looking for a sweet spot.

I realize now, I only gave an overview. Maybe I will put all the details up. If I do it will be after I unwind a few and see how it looks according to jesus' suggestion of 2+5 with 120 turns on the secondary. That way all those similar details will be together.

thanks,

jeanna

[innovation_station]

due to the efficientcy of solar cell, i don't think it can close the loop.
but it is a sure way to recycle some of the energy used to light the neon or leds.

i dont look to close the loop ...

i want bright lights from a solar powered device ....   it needs the battery so why take it away ..


quick and simple .... 

and an impressive demo unit 

ist!
could drop a few solar cells round the cfl if you want ... or if you use leds KEEP EM CLOSE TO THE PANNEL... 

it would help to feed some back for the dull days.... to keep the battery topped up ..  or close to topped up

would be really cool if it looked like a flower in the end where the solar pannles gather from the sun and at night from the cfl ...

just plant em in the flower bed ...   along the walk way   bill and jenna    if you could design a nice stem for the flower it could turn into a tree 

with branches of light

earth battery stem that you plant ...  then   you have 2 charge sources....  for your tiny battery ....

gadget we need your cam unit built on a board ...  tuned to a 40 watt cfl ... to full brightness ....  for the lest input possible ....   

and there you go


FREE LIGHT FOR EVERYONE ....

JUST PLANT IT ....  ALLMOST ANYWHERE ...

[jeanna]

just plant em in the flower bed ...   along the walk way   bill and jenna    if you could design a nice stem for the flower it could turn into a tree 

with branches of light

earth battery stem that you plant ...  then   you have 2 charge sources....  for your tiny battery ....


JUST PLANT IT ....  ALLMOST ANYWHERE ...

I'm on it IST!, I have been planning the following:

In the spring I think I can get a small galvanized pail. I have seen them with citronella candles in them. I will fill the pail with earth then fill the center part with spent carbon granules from the brita filter, and stick a carbon rod into that. this will give at least .7V. Well, these days .7volts sounds like a lot. So, I will take a little jt with 20 turns secondary and 2 lights and hook it between the pail and carbon rod and have a brilliant  outdoor light.

Now, what am I gonna do with all that citronella candle material? 

jeanna

EDIT: I just found a bunch of places to get these buckets. 2" beensy ones for less than $1 and 4" ones for under $3. so in the spring...

[gadgetmall]

@jesus,
Thank you for your suggestion. Is there anyone else that is seeing that 2 makes a
difference?
I see you are getting the best with a two turn difference from pri to sec 

@xee2, so the cap across the battery which appears to offer nothing, is protecting the circuit and allowing a spike to be there faster than a battery would?

I HAVE NOT FOUND A CAP THAT PRODUCES LOWER CURRENT DRAW ON  THE  JT  . I DON'T USE ONE .

@all,
About the circuit with the uneven turns. I see nothing non-linear here as much as I try. I can run down all the numbers for you if someone wants. I am happy to do that. Here is the recap.

The basic circuit with its
1k base resistor, the
2N3904 transistor,
a VR in place below the base with its cap || to it. but the VR is set to zero...and
5+5 bifilar with 120 turns secondary
the secondary to the leds :

The rectified voltage of the secondary is 34.6V both ways
The amp draw is 16.8mA

As I added turns to the primary collector coil the rectified volts AND the amps both went up.

Any time I turned the variable resistor with its parallel cap to anything above zero all the way to 10.8K the amperage went down, but the rectified voltage did too.

SWEET SPOT DON'T FORGET THE RESONATE SWEET SPOT !!
--

So, it is all fine to light leds with low amperage and the high voltage which is oscillating, but I am not yet prepared to think I am getting near to replicating this fuji transformer.

The fuji circuit has a clear metallic capacitor in a place that is not on the base of the transistor, I think. This is not the big-mama cap, but something that seems to point towards the second coil which could be a relay. I don't want to add more than one thing to my jt coil at a time and this base cap has not been beefing up my circuit.


@gadgetmall, I am trying to remember if the joule thief basic is where you have added this 68pF cap? I think it is. Do you have any suggestions here?

i AM RIGHT ALONG WITH YOU  50 T x 50 t  WITH A SECONDARY OF 30 TURNS . WITH TWO TANK CIRCUITS AND A RESISTOR ON THE BASE . .81 MA TOTAL DRAW WITH 4 WHITE LEDS . i WOULD KEEP THE TANK CIRCUIT TAKE YOUR BEST IDEA AND INCREASE THE TURNS  TO YOUR BEST READINGS . IT MIGHT BE THAT YOU ARE USING LOWER TURNS SO YOU MIGHT NEED A SMALLER vr.CAP TANK  MAYBE 1 K OR 5 K . .. . IF I USE A 101 CAP 102 103  CAPS  IT DON'T DO THERE IS A DIFFERENCE IN PICO FARAD AND MICRO FARAD


PS I think kubikop is just showing the peltier effect can go both ways. Really, he boiled water for one side, and he used ice cubes for the other and lit a led for 10 minutes. This is interesting but does not show efficiency. IMHO  Now, if a peltier doodad can be run by the high frequency voltage coming off a joule thief, that would be very exciting. In my next order from allelectronics I will get the one they have for $14. It is too high priced for a usual order from them, (especially after those leds) but it is a question I want answered.

Hey Gadgetmall, wanna try it?

already HAVE FIVE MODULES .. i HAVE PLAYED WITH THEM FOR 15 YEARS  . THEY ARE FASCINATING TO PRODUCE COLD FROM ELECTRICITY . i LOVE EM . i ALREADY TRIED THE INDUCTION THING . IT DID NOT WORK FOR ME BUT I AM GAME FOR ANYTHING YOU COME UP WITH  !!!!