Joule Thief

[stprue]

Underside

[gadgetmall]

Ah, the earth battery comes up again.  Gadget already ran his JT from the EB and soon, I will be attempting the same.  Jeanna, maybe all that work and research we did a while back will pay off for us soon?

Bill

Hi Bill Congrats on being a Mod !!! . very Cool . Yes i am working on several Earth Projects .soon to light up 1000 leds !! . I also am experimenting with the 555 timer to replace the transistor for a more precise frequency adjustment . and yes the work on 1 volt !! no more current drain than a silicon transistor so the it doesn't take 5 volts to run a 555 timer . also i will get some time to give out a schematic or two when i get them drawn . I got me 4 cameras off eBay for less than 40 dollars for all of them . three are 8 Mp !!! on is 5 mp . I love them so no more blurry videos or photos . I miss you guys and need to catch up here so I'll be on the back burner for a while . Also try Darlingtin transistors . they will more than double the output and you can feed back a secondary to make it run with less ma draw . I've done it  from 120 Ma and feedback to less than 50 ma with 300volts out . Not Mk stuff just normal jts with few secondaries .
Look . i love you guys and Belive me . Love Christ and Happy Easter !!

Albert

aka Gadget

[xee2]

@ stprue

Looks nice. Can you post some of your performance results, such as voltage out and battery current? What transistor are you using? What is base resistor value?

[dog812]

Will using different components make the LED's brighter?
Like using a 3904 instead of the 2n2222?
Or using a smaller resistor ? like a 900 ohm instead of 1k ohm?

or does any of that matter?

Does it matter what kind of wire you use? Strand or solid?

[jadaro2600]

I've noticed that the associated parts do change the dynamics of the circuit - if you want to throw more current at your load, then you will need to get a new transistor.

Personally, I've toyed with the idea of using this CRT transistor..high frequency, higher current and higher overall tolerance.

The 3904 will give you more range to work with.  Some people have mentioned stressing the components - after all, most of them only cost about 15c each save for the LED itself, which I have actually blow on more than one occasion.

There are arguments for an against all ideologies of mechanics regarding how you setup you joule thief circuit.

@555 timer interested people,

Try using a transistor as a switch between the to be tested joule thief and the 555 timer circuit.  This will isolate the 555 timer from the joule thief elements.  You will need two batteries, of course.

@all, this thread has jumped 16 pages in two days, ad before that, when there was so much confusion about how to wind a toroid, it jumped 10 pages.  Very interesting.

Nice setups everyone.  Lately I've been working with two jtc's on one toroid, I'm attempting to use a single resisted source for a switch.  When one jt turns on, the other is off, and the inductance which causes the oscillation to turn off then activates the other jt.  This has been working, but at reduced voltages.

I'm actually having problems figuring out how to wind it, I want to create AC, not a malformed DC-biased AC.

SO I have a problem, How do I form AC from three wires, one is common ground ( - ) and the other two are positive, yet one if off and the other is one while in operation?  I imagine a Diode arrangement might do the trick, ..but I'm thinking it's a bit more complicated than this.

If this works, I won't need a mechanical switch, or a drinking bird ( which operates through evaporation, and thus it's timing varies with the atmosphere )