Joule Thief

gadgetmall · February 03, 2009, 04:34:26 PM

Quote from: Pirate88179 on February 03, 2009, 03:36:21 PM

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

Hi Pirate

the first picture shows the Blue pot inbetween the transformer and the transistor
the second photo which i updated shows the little brown cap position .

gadgetmall · February 03, 2009, 04:41:09 PM

Quote from: xee2 on February 03, 2009, 03:43:21 PM
@ gadgetmall

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

EDIT : THAT IS CORRECT FOR THE FUGI I DID !! I was confused and did not read i just saw the picture and told you how i did the JT Which . the cap goes parallel to the outside legs or the resistor part . then i use the wiper and one end of the pot . .

You got it right . i cut one leg off the VR i added on the FUGI . Now as far as i can tell tracing the resistor it looks like i took the base and jumped it to the other side of the resistor and coil /transformer .

xee2 · February 03, 2009, 04:52:40 PM

@ gadgetmall

OK. Like this?

gadgetmall · February 03, 2009, 04:55:25 PM

Quote from: xee2 on February 03, 2009, 04:52:40 PM
@ gadgetmall

Like this?

haha we posted at the same time look up ! I Edited the answer .. Also i tried different capacitors . Some "short it or stop it some don't . and a Cap across the battery inthe FUGI circuit draws more current . Just an observation with the caps i have here . On a New FUGI board i only removed the Big Cap AND THE FLASH TUBE > thats it the rest of the components are still there .

jeanna · February 03, 2009, 04:59:22 PM

Hi everyone,

I think I have been in deep space or something.

@gadgetmail, Have all these discussions about the PNP and 68pF caps and other caps been about the fuji circuit?

No wonder I couldn't copy it. I was using a simple wound toroid and a 3904NPN to which I added a 100pF cap at the base...

Please clarify. My head is spinning with all the new ideas and posts today.

@xee2, When you said bad idea etc... what was the bad idea, please?

@All,
I got my order of toroids, and also a thing 3/$1 that goldmine called high voltage board which is a stripped camera ckt which seems to have a big transformer. It also has a neon light and some other things we use. no cap no xenon bulb, no battery. I kept quite until I saw the transformer. It has 5 pins soldered. but it is the big one, I am pretty sure.

I want to get to work on something right away... mmm I wonder which way to travel today

@Jim, I saw the one with the mousetrap, but I haven't found the first one yet... (I went looking then got distracted, I think)

thank you all for such a great thread,

jeanna