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 Post subject: Lighting a cfl
PostPosted: Wed May 05, 2010 12:57 pm 
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i recently built this cfl light from a 1,5 volt battery.
it works reall really well.
but there is a great problem as i cannot replicate it no matter what i try.
I can manage to get a circuit to give extremely high voltages but it will no way light up my cfl. what am i doing wrong as i have my original to copy directly from and i have been trying for weeks to replicate it.
the only real problem is i dont have an identical transformer as the first one but i do have one which is very very close.
i have tried every resistor also a pot and several caps and diodes.i ahve also tried numerous transformer coils.the thing which bugs me is i can manage to get all of them to make over 1000 volts.
i am at a real loss as to what to try next as i have tried almost every combination.
My question ,, is it the high voltage that is lighting up the cfl (internals removed of course) or something else i am overlooking??
Image
Image
i have sisnce removed the caps and diodes from the photo and it still works as per the diagram


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 Post subject: Re: Lighting a cfl
PostPosted: Thu May 06, 2010 12:49 am 
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Nice one. How long a full battery can power the CFL?

How did you use the CFL, by using its filament or shorting the filament?

I learn that what power CFL is not high voltage. It would need current too. Without current it won't get bright


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 Post subject: Re: Lighting a cfl
PostPosted: Thu May 06, 2010 10:35 am 
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I dont understand your circuit, where does the negative go?

I suspect your problem is that you need a little more than 1.5 volts.


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 Post subject: Re: Lighting a cfl
PostPosted: Fri May 07, 2010 3:42 pm 
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i didnt get an email notification to this posting so i neglected to reply asap. apologies

sorry too, i left off the negative on the emitter.and the 2nd resistor is 2.7 k
it works very well as it is on 1.5 volts. with 2 x 1.5 volt batteries its really really bright.

i have been trying to replicate this for 3 weeks now. ive spent about 30 hours all up trying every manner of things including winding 3 of my own coils (very difficult being so miniature).i even wound a trifilar toroidal coil which turned out to be an excellent charger but wont light the cfl. so that ones being kept for that project now :)
my problem is i dont know exactly how the original coils are wound. i can see the guage of the wiring from the protruding ends. .7mm for the cfl side and .5 for the 2 joule thief windings. i have every identical component except for the transformer .

good to hear Suchayo say about getting some current . how do i measure current ?
thats what i havent measured as i dont know how.
the only thing i have been concentrating on are the high voltages which i can produce without a problem.
i really really want to replicate my working model and not destroy it to see its internal workings just yet as it may be the only one i ever get to work like this :(

How did you use the CFL, by using its filament or shorting the filament?
not sure i understood this. i just pulled it apart as per imhoteps video and twisted the 2 strands from each end together into a single wire, from each side of the cfle tube ends
Image


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 Post subject: Re: Lighting a cfl
PostPosted: Fri May 07, 2010 4:07 pm 
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i just have another quick question ?
the left side of my circuit is just a simple joule thief .correct?
how could i wind a joule thief to give greater current as per suchayos idea.
i think (and correct me if i am wrong ) the right hand side 3rd winding is the high voltage producing side. no wait that cant be correct as my other joule thief also makes over 1000 volts and it has only 2 windings. so is the 3rd winding for current???
i know i am rambling on but its very confusing.
cheers again Bazz


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 Post subject: Re: Lighting a cfl
PostPosted: Fri May 07, 2010 4:49 pm 
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I think this is what is happening

open the simulator

http://www.falstad.com/circuit/

Then import the text below

$ 1 5.0E-7 0.08464817248906141 50 5.0 50
169 160 128 224 128 0 4.9999999999999996E-6 1.0 -2.540137877815596E-9 -8.436029616373554 -0.036914406653888676
v 496 208 496 160 0 0 40.0 1.5 0.0 0.0 0.5
w 336 128 336 176 0
w 496 160 224 160 0
r 224 192 272 192 0 20.0
t 272 192 336 192 0 1 -1.9941095681584966 0.8013036610656985 100.0
w 336 128 224 128 0
w 496 208 496 320 0
w 336 208 496 208 0
w 160 320 160 192 0
w 160 128 224 192 0
187 160 320 496 320 0 270.0 1.0E9 47.4 1.0
o 5 1 6 35 74.82888383134222 9.765625E-55 0 -1
o 11 1 0 35 160.0 0.4 1 -1


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 Post subject: Re: Lighting a cfl
PostPosted: Sat May 08, 2010 12:08 am 
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thanks mbrown that circuit builder may save me hours of headache.
thanks :D


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 Post subject: Re: Lighting a cfl
PostPosted: Sat May 08, 2010 1:19 am 
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i tried making a circuit and realized that i really dont know what i am doing . it seems to work but are all the values correct??????? i wouldnt even know where to begin.
this is the best i could do to copy my circuit and it seems to work in simulation anyway.
$ 1 5.0E-7 0.08464817248906141 50 5.0 50
169 160 128 224 128 0 4.9999999999999996E-6 1.0 -2.540137877815596E-9 -8.436029616373554 -0.036914406653888676
v 496 208 496 160 0 0 40.0 1.5 0.0 0.0 0.5
w 336 128 336 176 0
w 496 160 224 160 0
r 224 192 272 192 0 20.0
t 272 192 336 192 0 1 -1.9941095681584966 0.8013036610656985 100.0
w 336 128 224 128 0
w 496 208 496 320 0
w 336 208 496 208 0
w 160 320 160 192 0
w 160 128 224 192 0
187 160 320 496 320 0 270.0 1.0E9 47.4 1.0
o 5 1 6 35 74.82888383134222 9.765625E-55 0 -1
o 11 1 0 35 160.0 0.4 1 -1


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 Post subject: Re: Lighting a cfl
PostPosted: Sat May 08, 2010 1:51 am 
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gizmobazz wrote:
how do i measure current ? thats what i havent measured as i dont know how.
Use amp meter in series with a diode in the high voltage part.


gizmobazz wrote:
How did you use the CFL, by using its filament or shorting the filament?
not sure i understood this. i just pulled it apart as per imhoteps video and twisted the 2 strands from each end together into a single wire, from each side of the cfle tube ends
That means you are not using filament.

gizmobazz wrote:
how could i wind a joule thief to give greater current as per suchayos idea.
The one that connect in series with the CFL is the one need to be tuned. Less winding at HV part means more current.

I once had a circuit unable to replicate again which give full brightness like when attached to grid. It changes frequency it self.

I think the ratio between the primary and secondary part is important. You may need to unwound or adding wound in the secondary (HV) part.

To get high efficiency the surface area of primary and secondary must match even with different wound. This is solved with big wire in LV part and small wire in HV part.

If you want to try something else, try this circuit of mine


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 Post subject: Re: Lighting a cfl
PostPosted: Sat May 08, 2010 5:42 am 
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Here is video showing my 3 watt CFL lighter
http://www.youtube.com/watch?v=4_jowC4icdc


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