Joule Thief

[Pirate88179]

Hi Thanks . No i wont be Drawing up a Circuit but if you have a Fugi board all you do is short out the Diode . Hook your lamp up to where the cap was .. look at the transformer on the component side. there is a small resistor there between the transistor . remove it and put your pot there or i have found that 3000 ohms works good , . Next turn the board over . trace the resistor to the coil connections . this  is where the 68pf cap is soldered . Thats It ! I'll post a Clearer picture of the back in a little while . !! EDIT ITS POSTED CLearer  . Also when using the resistor ion my third unit i built today i added a "Start"Switch . Its a  small momentary pust to close connected across the resistor if your CLf or tube Will not light up bright to start with . When the batt reaches 1.1 volts or lower this is needed  or either a variable. BTW My 13 watt CLF is still lit  Batt is 1.17 .. I will let it run for another two hours then recharge the battery . . Number two has been running since 8 this morning CLF 45 watt thats 7 hours so far on that one  ) Much Better . I bet this will light 400 leds for a LONG time !

Gadgetmall:

Fantastic work!!!  I think I understand everything you did except the cap.  I did not see the cap in your photos unless you are speaking of a small electrolytic cap?  Is that what I am seeing there?  And this goes from the end of your pot down the path to the leg of the transformer right?  Mine are wired to one leg of the trigger coil just for added mechanical bond but you say you are using the trigger coil as well?  I was also thinking of doing that but I didn't think it would fire much as we removed the large cap.

Sorry for all of the questions but your modification would probably run my 400 leds for hours and hours and hours!!!  Or, a 48" tube for a very long time as well.  To me, this is very well inside the area of being "useful".  This is actually practical and can be replicated and used by anyone.  This is far better than any camping light, or home led lighting I have ever seen.!!  Great great job.

Bill

[xee2]

@ gadgetmall

Is this correct? Or should the cap go to the other end of pot?

EDIT: incorrect drawing deleted

[Mk1]

@ist

Lest do the jt circuit first, then work the output coils.

I don't think you will be able to test it with a led in the regular jt way, it should not work but put a load or led on the out coils or rectify to adjust the base resistor to decent output.

[Pirate88179]

@Xee2:

I think he said the cap went between the pot and the leg of the transformer where the end of the resistor was going before removal.  I believe this is correct.

I think I have to use another "new" board to replicate this as I have already removed everything on it that was not being used by the JT circuit idea.  In other words, I don't think I have a path or completed circuit going to where the big cap used to be.  I guess I could solder in little jumpers where the resistors I removed used to be.

This is a very good improvement he has made here.

Bill

[innovation_station]

thank you MK1  .    i knew i was doing some thing worng  ....    lol

i will build that proper mag amp ...   just after the GADGET!!   lol

mag amp aside lets build THE GADGET !!!   




lol


ist!