Joule Thief

[gyulasun]

@ gyulasun

I assume that mikem_2au was reporting the open circuit voltage from measurements something like the following circit. But the circuit still is very impressive. It seems to be putting two coils in series to get a higher output voltage. I also hope mikem_2au will provide more information about this and his Fuji board mods. To light an unmodified CFL is very impressive.


BTW, I think your explanations were very good. I hope someone will learn from them.

Hi xee2,

Thanks for the kind words. 

I would like to correct my mistake on giving the COP a mW designation, it was late last night, lol.  So the second COP value when the input is 1.5V x 39mA=58.5mW and the output (with the third wire) here is 21V x 27mA=567mW,  the COP is 567/58.5=9.69    (and NOT 9.69mW as wrote it last night).   A very high COP indeed, by the way!

rgds,  Gyula

[electricme]

@Bill
The mice neva went 2 skool liyke i doo, day kant wreed lyke i kan, them dumm mouses. lol
I just gota get more mouse traps, an mouse ammo, then they turn into flying mouses as they pass through the open window, an the birdies get a feed.

Now I wonder if I can hire a pussy cat he he.

[mikem_2au]

@gyulasun
   Thankyou, i have double checked the results, i had to,
for my own Peace of Mind. I am a little fuzzy on what is Happening
with the third winding, if you have the time and are able to explain
this to me more, it would be greatly appreciated.

The equations you have done in your reply will be very helpful, thankyou.

I also hope to show how i got these results tomorrow, just got to
get it from my head to the screen.



@gadgetmall
   the extra winding was threaded through, i'm not sure of
the guage but it was about half the thickness of the winding already
on there. the toroid version was putting out DC but the fugi transformer
was putting out more AC than DC, I'm not sure why but if you or someone know's,
I'll gladly listen.
I have tried to replicate your fugi mod but without success, all i got
out was the 1.5v i put in, not giving up though, i was lucky enough to
grab some fugi's marked down to $1.80 au, must of been almost out of date.


@xee2
             you are correct, that is how the measurements were taken.


have only browsed over the last few pages,  have to sit down and catch up tomorrow.

[mikem_2au]

@xee2

        with the toroid version the measurements when taken were without the 10uf capacitor across
the diode and emiter, adding the capacitor lowered the voltage and increased the current.

mike..

[gadgetmall]

@gyulasun
   Thankyou, i have double checked the results, i had to,
for my own Peace of Mind. I am a little fuzzy on what is Happening
with the third winding, if you have the time and are able to explain
this to me more, it would be greatly appreciated.

The equations you have done in your reply will be very helpful, thankyou.

I also hope to show how i got these results tomorrow, just got to
get it from my head to the screen.



@gadgetmall
   the extra winding was threaded through, i'm not sure of
the guage but it was about half the thickness of the winding already
on there. the toroid version was putting out DC but the fugi transformer
was putting out more AC than DC, I'm not sure why but if you or someone know's,
I'll gladly listen.
I have tried to replicate your fugi mod but without success, all i got
out was the 1.5v i put in, not giving up though, i was lucky enough to
grab some fugi's marked down to $1.80 au, must of been almost out of date.


@xee2
             you are correct, that is how the measurements were taken.


have only browsed over the last few pages,  have to sit down and catch up tomorrow.

Hi Thank you for the reply .good work on your Mod and winding that extra coil . its interesting that you said the Fugi mod is putting out what is putting in . thats two people that said that . there must be an error however its not mine at least on the mod part . the pictorial from goat works on mine . . You can get results If you simply change out the 220 resistor next to the transistor with a 5k to 20 k pot and short the diode .hook up a modded cfl to the Hv cap output with the cap removed . Stop there and you should have a gutted Cfl Lit if no then there is a Short .only go this far before you continue ! . ok   .. I have done My mod many times  exactly this way no problem . . there is a spot on the board that one lead from the pot  is soldered to and it will short if not careful Its very close to another connection .I have done this and found it shorted .. . anyways try that . forget the diagram for now just do the above only if you want to get it running .  . then proceed if Modded cfl lights .  If you find that the error is Mine please let me know on that Picture of the Lines pointing to the area in question .. Like i said before i just build them and try to do the best at showing where the connections are . I have used that picture of goats and have replicated it several times but maybe theres a slight difference . so forget the diagram and do as above first ..

Gadget ..