Joule Thief

[dasimpson]

   All:
   I already have the Captret- Joule Thief selfcharging, but only using one or two leds on it.  If I add more leds like last night it was running on 12 leds very bright, it may not be able to keep up that many. This is what I'm working on now, since the draw has to equal the charging ability of the Captret part of the circuit, or it will run down.
  I also have several other Jtc that are running and charging one or two AAs, off of a single AA, and I can also swap them back and forth.    But the Captret-Jt was lighting the leds all week on the same batteries without discharging them by more than one volt.  I still don't know if the Jt part is actually needed at all, as it may be that it is only hanging up the Captret circuit, or a custom made Jtc needs to be made just for that purpose, possibly with no resistor. More tests are needed, but so far I can say that my Captret-Jt will run without discharging, on one or two leds, for at least severals days.  A small solar panel will take care of any further voltage drops, and bump up the charge when needed.
  I'll upload some more pics, soon, but the one shown is of my tiny Bumble Bee Solar Jtc, still self running after 6 months.
               NZ

yeah i understand the how to do it it is just working out how to get the current out of the jt to feed back into the source battery supercaps could be the way but the charge rate has to be far lower then the disharge rate so the jt can fill the caps befor they fully drop below the 2 volts needed to charge a 1.2 volt battery plus you need a diode between the caps and the battery to stop the battery charging the caps

[dasimpson]

if i remeber correctly jaenna tried a step down wall transformer on her highest voltage jt with poor results but i wounder if that is because of the compnonets in the transformer

[dasimpson]

you might find nick a cap in parallel with for solar panel would be needed i know when i tried to run a jt off a solar panel i had to add a cap to make it work

[NickZ]

 Dasimpson:
  The tiny solar Jt is running fine with no cap.  But in order to charge a battery so the led can run at night, a cap may help to raise the voltage to charge a single AA.  So far I still feel that way to keep a Jt self-running is with a small solar panel, and battery. Since once the small AAs lose start to lose their charge, nothing much is going on, frequency changes and there went the resonant effects.   Yawn... like Osiris says.
  I am now working on a new battery layout for the Captret-Jt  that will make the metal cans of the batteries and capacitors work together like an antenna system.  More on that soon...
                       NZ

[dasimpson]

all the cap dose in parrallel with the solar panel is give the jt the ampage it needs to perform better if you test the out put with and with out the cap you will find higher voltage with the cap there