Joule Thief

[jeanna]

@ jenna

I replaced my 1,000 pF base cap with 10,000 pF and performance was about the same but not quite as good. So for me, it looks like I should not go higher than 1,000 pF.

Thanks for the link to the article. It was interesting that he was using base caps.

Hi xee2,
I haven't found one yet that IMPROVES performance. I have just put in a 102pF at the base resistor that filled in between where the rest took me yesterday. But, still, no matter what I put into the battery spot, there is an amperage hit. (the hit is only 10 mA, ) but I wonder why it is there?

What is it supposed to be doing? Is this another "tank"spot?

thank you,

jeanna

I need to re-find my good source for good cheap leds. I do not consider $1 to be good and cheap. Any leads for leds?

EDIT. I actually have found it, but, hopefully there is an omission in their webpage. The only item missing is the single white led, although there is an actual link to the item.  I emailed them.

With luck we will have a really good source. I paid $19 for 50 bright leds a few years ago. The prices look the same on all the other items. With fingers crossed...

[gadgetmall]

... just an idea; you could make such a wheel yourself, just make a little wheel
with a slide contact and separate contact sections connected to each individual
resistor with all of the resistors connected to the outer rim, then connect the wires
to the central connector and the rim, and slide away... that way you'd only have
to solder the thing together once...

O K .. would be nice but dang look at all the packs of resistors you would have to buy then make something : a Wheel with contacts .. that are good and solid connections . too much more work than just buying every single resistor and just soldering them there   But If that would be the case ( money ) and it  came down to it i probably would try it if the world depended on me for something . you know war and energy Crisis's and

[sparks]

    If we take a flyback transformer and pulse it a 15kz 300volt pp input the transformer will take it up to 30 thousand volts at 15kz pulsed dc.  That is a voltage multiplier of 100.  Now say you have a capacitor that holds on to the 30kv.  Now you discharge this into a theoretical o ohm load.  The resulting amperage would be 30,000 divided by o.  Zero goes into 30,000 alot of times.  So give your resistor a value of .1 ohms.  Your amperage will now be 300,000 amps.  Put an inductive coupling around this amperage flow and you will get some surprising results.  The problem is that at this high a voltage you won't get close to the capacitor before it starts discharging through the air whose resistance is quite high. That is why Tesla made sure his zero resistor was already attached to the capacitor.

[gadgetmall]

Choose the one you want.

Jesus

Oh i hate TEST   B ..... or the top right one is the correct except one leg is cut off the pot Nieves . thank you . . i posted that it should of connected to 2 because the 2 was across the transformer but looking at it again i see its the same connection and you showed that .. thank you ..  was right except for the 20 pot is 20k pot and there is a break in the leg so no connection on the far end of pot . Nice of you to put up those . I couldn't tell nothing from that one that had a box for a transformer on it before your collection of real schematics ...

[jeanna]

I will try to upload the 2 pdf's I have,

The first on this post is 84K and is the full spec sheet on the transistor in gadgetmall's fuji mod.

jeanna