Joule Thief

[nievesoliveras]

Hi everybody,
I will try to reply to all the posts at once.
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@jesus,
What a find. Too bad you couldn't replicate it.
I think since the toroid materials can vary so widely, it is difficult to replicate many of these toroids.

but, maybe we can find some keys to the parts and so be able to design toroid circuits that others can easily replicate.
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Thanks everybody,

jeanna

@jeanna

That would be marvelous if we can design a toroid with the flash circuit as a model but without the 1750 winds, that would be cool.

@all

You have to believe me when saying about high voltage thief , do this 2 jt coil at 180 coil 7 turn each try not to go over 3 wire large and 2 layer  , On the side left blank wind starting on one side close to coil 13 turn to the next coil then go over those 13 turn back down making 26 turn coil , make one one the other side. This will give you , 60 volts on those 24 turn coil, so when rectified you get 120volt dc , this is not a joke, please replicate. No led between the collector and emitter.
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Mark

@mk1

I did one simple joule thief with 22 winds bifilar #26 awg wire that gave me about 80 volts between the collector and the emitter with no LED or diode attached. Hence on one post I said that if you measure between the collector and ground, that it is the same as the emitter on an npn transistor, 25 volts at least, that this was a good Joule thief.
I have now one with just 7 winds and I will measure the voltage and post later the results.

I've looked all over the instructables.com site for the solar lamp self-runner you showed, can't find it.  Do you happen to have the link

many thanks - Duane

@mdmiller

I will try to get it. At that time I just took the photos and stored them.
I will make a search inside the site to see if I can find it again.
Do you know that the instructable can be downloaded on pdf format and store it on your hardisk for later use?

Edit:
I found this one: It was a competition that date.
http://www.instructables.com/id/SPREE_Solar_Photovoltaic_Renewable_Electron_/

@all
I can post the rest of the photos I have for a broad idea of the vanished instructable if so you desire.

Jesus

[Mk1]

@ jeanna

Since the pickup coil are not in the circuit , you have to make sure that you test the polarity of the coil because , the over all design off the joule thief is really important and just putting wire around in ant fashion and place on the coil , changes the polarity if you don't check all the coil and make sure the output is going the right way . if you can try a coil again like you did at first adding only one led and check connecting the 2 ways see one will work better.

Keep the good work.

[Mk1]

@all

I must really stress the fact that the design of the coil will make a huge difference in results, Please try the design this is important.

If you just do a regular bifilar jt , you get 30 volt max. There is a lot of thing to be studied in those coil design. 

@Jeanna , same spot as same place(location) as the first pickup coil , so to be sure always check the led both ways.

[nievesoliveras]

@all

I will post the rest of the photos anyway. Maybe it can be of help to someone.

It is very simple. It just needs a 12 volt battery, a 12 volt lamp and a 12 volt lamp connector.
The other thing is a solar panel.
I dont have the part number, but it is easy to get one of those and the 12 volt connector on your country.

Jesus

Edit:
I measured the  output of the joule thief with 7 winds 26awg wire and it just gave .54  volts dc and .6 ac.
I dont know what has happened.

[xee2]

@ jeanna

I wish I knew who made those diodes. They were $4.00 each and I was so amazed I bought 4 of them. I have no idea if they were just some freak result that happened during manufacturing or if there are other diodes with similar performance available. But, if you want to operate a long time on a single set of batteries, then at least you now know it is possible. It is just a matter of finding the right LEDs. If you see super bright green LED diodes for sale with similar specs you might want to buy one and try it. Who knows, they might be the same.