Joule Thief

[freepow]

@ All

I have made Joule thiefs before, but what is the maximum mA's or Amps that i can get at the output of a Joule thief using a 2n3055 transistor ?

Is it possible to get 12 volts with as high as  2+ Amps at the output

Because I would like to power 24x 285,000 mcd LED's, all bright and at the same brightness ! which would =
2400 mA's draw !

[onthecuttingedge2005]

There is only one reason I don't pick on JT, it doesn't claim OU that I know of but there could of been somebody who did. you still pay for what you give and take in a one to one fashion. mainly because the JT frequencies are not matched to the surrounding environment to get back twice what they capture. 

[electricme]

@Altrez,

I have never read anywhere that the transistor replaces a spark-gap in a JT? Can you please post some links that sounds like a very interesting read! I am not 100% sure but I think the JT is basically just an oscillation circuit that ramps up the low voltage to a very high voltage. At a very low current draw from the battery.

It works with high frequency and high voltage to do some really interesting things I could be totally wrong here so Bill, Jim, Jeanna, xee2 please feel free to correct me!

-Altrez

very true Altrez, as the voltage goes up the current component falls to levels that are almost impossible to measure.

But, the other day I managed to create a spark gap, I did.

@Jeanna,
You asked me about 6 months ago if I had ever managed to make a fluro glow, as you havent seen any results from one of my JT.
Lets see if my prime time will allow me to post an image or two.

jim

[electricme]

@all,
Here is the way I connected up the output from the JT to power the fluro tube
And it is the same setup I used to try and recharge twenty one 12volt gell cells in series.

Be careful of it's output, its a bit savage on the fingers ha ha.

[stprue]

hey
i should have said something sooner but if you put a inductor between the two emitter wires it make it alot more adjustable and more powerfull..
i built this circuit trying to improve the gadgetmall design.. only to find the secondary is more powerfull than the
c-e connection and i think we can light jeanna's loa bulbs with alot less ma's..
i want to thank you for duplicating this..

robbie

I will try some inductors!  I had a lot of fun building this circuit! It is one of the most efficient circuit I have built so far.