Joule Thief

[xee2]

Hi anyone,  Can you light a 4watt 240VAC fluoro with high pulsed DC

Yes. The voltage listed on tube does not matter when using JT. Usually a peak voltage out of JT of over 400 volts is needed to light tube.

[stprue]

Yes. The voltage listed on tube does not matter when using JT. Usually a peak voltage out of JT of over 400 volts is needed to light tube.

xee is right for the most part but some coils can light a tube with a little less!  Use xee circuit diagram and you will easily light a floro!!!   

biggo toroid
some winds
3055 transistor
POT
PS
done 

[resonanceman]

Oh good.
I thought maybe you had.

I saw a really odd thing today.
I took scope then dmm measurements across the led.
I figured and was right that the dmm could read in that place.
BUT
The results were exactly the opposite of the lights.
The voltage difference across the brightest leds showed the lowest amount and the voltage difference across the 4 dim ones at the right end were the highest and matched the battery voltage. (which could be coincidence).
I have not touched this circuit for a couple of days. I just walk around it and poke at things.Many of the ones I am using now are.OK I will.
I thought of that, but I cannot get any reading from the scope or now the dmm. It would tell me if the meters are correct, and even if nothing more, that will help.

In a way this recent set of efforts started with that.
The filter with its unused other side kept staring at me.
I got next to nothing from it until I added the inductor toroid beyond - to the right- of it.What's a splitter?
I tried my red full spool to no greater advantage also.



Thanks for all the good experience and ideas.

jeanna

ADD
Actually, what I think I want to do is make an addition that is similar to the top end of the camera circuit.
I keep forgetting to study it when I am fresh...(which is not now  )

Jeanna

I  don't think  what  a meter says  really has any meaning  with these kinds of things .
I have lit up  the same  LED array   with   as little as 20 V indicated  across the array ........and  with  as much  as 250 V indicated . 
I think   it is more about the  spikes than  it is the voltage .

Maybe  with  a scope you  will  be able to see what  is going on .




A splitter  is  something  that I made to  return  more  power to  the batterys .

I have made a few  inductoors   with 2 equal  windings ......  one winding is hooked  in series  with the secondary , for flyback .......the other is hooked in parallel   for  feedback .
A  normal   transformer   or  an isolation  transformer  can   be used  as a splitter .
The whole  idea of  a splitter is  about  sending  about half the signal back to the  battery .



gary

gary 

[jeanna]

..

Maybe  with  a scope you  will  be able to see what  is going on .

The problem with the scope on these extended multiple inductor coils is that the scope introduces too much of its own and I believe changes the results.

What I am seeing is that the frequency which is going down but still fast is probably not what is causing the diminishment. I am seeing the waves widen out... a lot.

But, even so, one time the filter shows 7,7v and I can barely light a led the next time with more inductors elsewhere, the same 7.7 volts easily lights 3 leds. so, it appears that it is just fiddling that will get it to make more.

A splitter  is  something  that I made to  return  more  power to  the batterys .

A  normal   transformer   or  an isolation  transformer  can   be used  as a splitter .
The whole  idea of  a splitter is  about  sending  about half the signal back to the  battery .

I see what you mean by splitter.That is what the filter is. It is an isolation transformer.

This makes sense.

Thank you.


jeanna

[resonanceman]

. I am seeing the waves widen out... a lot.

This  is what I was thinking  was going on .

The  inductors  absorb  the spikes  and  sometimes turn them into  current .

I see what you mean by splitter.That is what the filter is. It is an isolation transformer.

This makes sense.

Thank you.


jeanna

It can  be an  isolation transformer.......... but that does not mean  that is has to be an  isolation transformer.    The  important thing is  that it  has 2 windings .....one is  used  in secondary  for  flyback .....the other is  used for feedback .

gary