Joule Thief

[dasimpson]

one circuit i made had a 25ma draw when i ran it with my 2500mah battery i expected 100 hours of light but for some reasion i only got about 10 to 15 i dont know if this is because the 2500mah is classed from the full charged voltage of 1.4volt down to 0v or if it is 2500mah from the fully charged mark to the 1volt flat battery mark i think to have 2500mah you woul have to run the battery from full down to 0 but i can not find true or folse facts on this

i also dont think the joule thief follows ohms law as the current draw seems to change as the voltage of the battery changes

[Bizzy]

That is interesting to note the lower amperage draw. I will have to make a JT with a 5kw resisitor and run that side by side with a 1kw reisitor as well.
That is if any of my parts get here.
Most of the shippers are just getting caught up after the snow storms
Bizzy

[dasimpson]

i work with pc's so i got mine from power supplys monitors etc out of all of them i find black ones work best the yellow ones seem pritty rubbish
5k m8 (5000ohms) i think a 5kw would be way to much lol

i did try axial inductors they seemed to work very very good and got one unit to run on 1ma untill i tried to make it a solid unit think i applied to soldering iron for to long as one of the inductors stoped working

[Pirate88179]

Try using a 10k VR in your JT circuit.  With this you can tune for lowest amp draw or, for best light output.  If you have the correct components, you should be able to hit a good resonance point.

Bill

[dasimpson]

im going to do that i did buy one but then the vr went in my amp so it went into that instead lol just been to busy past week or so to get to the shop in time to pick one up