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Joule Thief

Started by Pirate88179, November 20, 2008, 03:07:58 AM

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TheNOP

#2635
February 09, 2009, 08:16:26 PM
@IST
what you need is any power switching transistor that can disipate as much as the current need by your jt.
it must also have a low base saturation voltage(.5volts or less)

i don't have any part number for now.
i will try to remember to find some for you.

have you tryed with the transistor that are in the CFLs ?

gadgetmall

#2636
February 09, 2009, 08:30:42 PM
Quote from: Pirate88179 on February 09, 2009, 08:03:11 PM
@ Gadgetmall:

I have a question for you on your modified Fuji circuit.  When you run the cfls until the battery is "dead" at your very low mA draw, have you tested the "dead" batteries to see what, if anything is left in them?  What I am wondering is this:  Will your Fuji take the batteries down below the threshold voltage of the transistor?  Or, if you then took those same "dead" batteries and put them into another JT toroid circuit, will they still do anything at all?  My guess is (and it, of course, is just a guess) that your Fuji will take the bats down as low as the toroid version of the JT.  I was just thinking a minute ago and was very curious.  Thanks.

Bill
Yes . i posted the voltage somewhere in here . the battery voltage will be aprox 1.10 1.17 on the two units running . once the clf stops 12.5 hours there is 1.10 -1.17 volts left . that is why i suggested some one get there leds out and see how far it will go on them  :) Mine stays hot another 8 -10 hours after so there is plenty of fire power left for leds.
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innovation_station

#2637
February 09, 2009, 08:33:18 PM
no i have not tryed them ...

im on to somthing else for now

ill be back to this unit soon  time for a solar jt battery charger  ;D

ill whip 1 of thease up dubble time

almost no mods to the solar curcuits..

ist!
To understand the action of the local condenser E in fig.2 let a single discharge be first considered. the discharge has 2 paths offered~~ one to the condenser E the other through the part L of the working circuit C. The part L  however  by virtue of its self induction  offers a strong opposition to such a sudden discharge  wile the condenser on the other hand offers no such opposition ......TESLA..

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Pirate88179

#2638
February 09, 2009, 08:40:55 PM
@ Gadgetmall:

Thank you.  I have not thrown an AA battery away since we all started this.  I keep thinking....maybe it is not really really dead yet.  I have a baggie full of them and some of my friends are saving theirs for me as well.  Might as well really kill them before sending them to the landfill.

Bill
See the Joule thief Circuit Diagrams, etc. topic here:
http://www.overunity.com/index.php?topic=6942.0;topicseen

slayer007

#2639
February 09, 2009, 09:19:20 PM
I wanted to see how many 1.2v AA batterys it would take to light the CFL up.
One just wasn't quite enought to light it up.
So I tried two and it light up.
Its not nearly as bright as it was off 12v but its not bad for just two batterys.

Heres a video of it lighting off two 1.2v batterys.

http://www.youtube.com/watch?v=MbdBO3o6qX4
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