Joule Thief

[xee2]

@ jeanna

I think you have missed a few key ideas. When you add the base cap the current from the battery will increase. BUT, so will the output voltage. Now, if you keep the cap in and INCREASE the base resistor value until the output voltage is the SAME as it was with the original resistor before you added the cap, THEN you will find you are getting the same output voltage with less battery current. The same type of thing works with the unequal turns. If you increase the collector turns the battery current will increase but so will the output voltage and if you adjust the base resistor to get back to the original output voltage you will find that the battery is using less current.  By doing both, you can get the same output voltage with much less battery current.

[jeanna]

@xee2,
Thank you.
I had a feeling I wasn't finished with that nasty variable resistor thing.

I will do these things. I agree I do miss these concepts.

also, yesterday I fumbled a question to you and I'd like to re-ask it. Please explain the reason you use a cap across the battery?

Thank you,

jeanna

[xee2]

@ jeanna

You should use a big cap across battery. It may not be needed if you are only drawing a small current from the battery but I think you should still use it. These techniques of reducing battery current work by pulsing the output. With the cap, the battery can supply a larger current when the circuit pulses on.

[gadgetmall]

@gadgetmal : Like with the Fuji boards, Lidmotor`s Peltier module seems to be unique. It would be nice to find out the exact module that he has got.  I asked him on youtube about the wattage, but he doesnt know it. I figure his is either very small or very large, still trying to understand the effect at all.
What wattage does yours have?

I have % of them 2 were ripped out of a big refrigerator 12 volts 1 .5 inches square   3 i bought there  60cm 55 watt  all 12 volt about 2 3 inches square . the three i bought are the biggest you can buy and are 55 watt . They will freeze a drop of water if you keep the other side heat sinked  and of coarse they will hit 195 degrees in a few seconds . i tried them all  . He is picking something else up i suspect . maybe not .. all pelitier modules are built the same its just the area thats different . thus the wattage ..  i can light up a couple jewelthiefs with just hand heat with them cool on the other side ..

[TheNOP]

And there is a step up transformer in the cfl bulbs, also in the fuji circuit the trigger coil not used by anyone here yet, in the cam circuit it steps up 300v to 5000 v yep that little transformer.

in my cfls, what look like a transformer is not a transformer.
only 2 pins are wired, it is an inductor.