any ideas?

 

ok.. finally it works!

i solved the problem by reversing the transformer wires... i also made this diagram and i hope it can help everyone who hasn't managed to make it work.

Attached Images

transformer.jpg (12.1 KB, 25 views)

 

I suggested that on my first response to this thread, perhaps you need to read the replies a bit more carefully.

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See the post in your Solar LED Forum for an alternative circuit.
http://www.electro-tech-online.com/e...ed-help-3.html

 

see it works

On a fresh AA Alkaline battery with a white LED, I have gotten mine to run for 5 days STRAIGHT!

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MechTronics

World of Warcraft is a disease

 

yes...sorry, i overlooked you post...

I've noticed it later on when i managed to make it work...
now i think it is going to be clear for everyone!

yeah it works..

 

Good, I hope it was a fun easy project for you

I have built at least 10 of them. My favorite one I stuffed inside a AA battery holder. It is really neat and compact.

In this picture it is a AA rechargeable, this was when I first put it together. right now it is sitting beside my laptop (brand new ) lighting up my room.

Wizz, do you mind if I put that pic on my website? I think it would look really nice.

CHECK OUT THE NEW PROJECTS ON IT!!!
www.freewebs.com/electronic-hobbyist

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100_1525.jpg (151.5 KB, 9 views)

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MechTronics

World of Warcraft is a disease

 

if someone makes it more clear how exactly it works....
it would be better!!!

 

its magic, there you go it is simple

How it works, is that the transistor makes the coil oscillate, which makes on the other wire a more increased Electromagnetic pickup, induced by electromagnetic waves, called Eddy Currents. Just look up how a transformer works.

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MechTronics

World of Warcraft is a disease

 

i mean step by step details so i can understand it totaly! thanks for you try though! here's mine!


P.S i forgot.... mine also has CE approval, as you can see in the second photo!

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	27102007116.jpg (130.0 KB, 10 views)
	27102007117.jpg (61.3 KB, 11 views)

 

The coil doesn't oscillate, the entire circuit oscillates.
If you use the proper ferrite core then there aren't any eddy currents to waste power.

The resistor makes the transistor conduct. The increasing transistor collector current in the coil causes the transformer action to also increase the transistor's base current.
The transistor conducts as much current as it can then the increase in current stops, and also the transformer action stops which causes the transistor's base current to reduce and then the transistor's collector current in the coil also reduces and transformer action futher reduces the base current until the transistor stops conductiong and the transformer action also stops. Then the resistor starts the transistor conducting again.

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Uncle $crooge

 

we are doing things and we don't know how they work! isn't that great Audioguru?

 

Not really, it's just a crude blocking oscillator - but damn clever!.

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PIC programmer software, and PIC Tutorials at:
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Not really, it's pretty pointless to do things you don't understand.

Do you know why it wouldn't work when the coil as connected in the wrong direction?

Nigel, audioguru, jcox and anyone else which a lot of experiance, please don't respond to this question, let them figure it out for themselves.

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I think that has to do with the biasing of the transistor... it doesn't conduct if the secondary of the transformer is not reversed although i'm not sure...

I only now that when two coils are placed very close and we apply AC the magnetic field for the one coil induces ac current to the other...