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Overunity Machines Forum



Joule Thief

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

Previous topic - Next topic

0 Members and 33 Guests are viewing this topic.

electrospark

I didn't read the 1110 pages so somebody probably already said that, but just to make sure,

You can try to wind some magnet wire around a pen or any air core until you get a resistance of 1K ohm.
I am not sure if it will work but i heard somewhere that it was quit effective!

Regards.

electrospark

Pirate88179

Mark:

I agree with Farmhand.  Thank you very much for sharing your knowledge and information.

Farmhand:

The only reason I was thinking supercaps on the output was my experience a few years ago with my first earth battery experiments.  (probably 5 or 6 years ago now...time flies)  In the early days, I could not even light 1 led, for some reason, I decided to stick a supercap on there not even really knowing what they were and...suddenly, I could light an led to full brightness.  Later, I used two 10F supercaps in parallel and could light multiple leds and after that...a 650 F cap allowed me to light 100 then 200, etc up to 400 leds.

After reading the pdf on the 1402 it just occurred to me to possibly try a single supercap on the output.  I am not sure what sparkfun uses here as I have not really found any documentation on their board, only the specs on the 1402.  At least their board will get me going on this project and I can use that as a starting platform  (Thanks again Mark)  Possibly, I can research the components they use and find their values.

My goal is simple...be able to use a "dead" battery and keep the lights on down as low as possible...lower than I have been able to using hand wound toroids.  (which is down to about .6 to .7 volts)  I wanted something easier to reproduce in quantities at an affordable price.

I will follow your work on this and post my findings once I get that 1402 board.  Meanwhile, if you need any 10 uf caps for the input, or any axial inductors at 47 uh, let me know and I will send you some.  I have about 10 of each here based on the 1402 suggested components.  Actually, I have 20 of those inductors.

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

MarkE

Bill, it is my pleasure to help.

Pirate88179

OK, so I received my 1402 board from Sparkfun.  Man, the entire board can fit on a dime!  But, that is good.

What is bad is that I wired it up to an AA bat. for a brief test.  Not only did it not light my led, the entire board got really hot within seconds. (and we had a bit of smoke)  So, I suppose I had it wired wrong.

Looking at my photo, (From Sparkfun showing the reverse side of the board) I had my 1.5 volt (+) input wire going to the hole marked 1-3 v in.  I put the battery - to the "ground" hole (probably my big mistake) and had the led leads going into the holes marked "3.3v out".  I tried reversing the polarity of the leds leads but had the same thing happen.

Could they not have had it marked input + and then - and then output + and then minus?  There are no polarity markings on the board anywhere and, looking at the schematic for the board, everything shows a common ground which I ASSUMED was the - side of my input battery.

Does anyone have any good answers to what I have done wrong?  I figure if I have burned out anything it is the 1402 chip and I have 10 more of them.  I don't even mind getting another board but not until I know how it is supposed to be wired up.

I used to think I was pretty intelligent but, the more I learn, and the more I try to do, the more I realize that I do not know.  This is good but, it is frustrating as this hook-up should be very, very simple right?

I would appreciate any input here.

Thank you all in advance.

Bill

PS  It is a really nice, tiny board that should allow the creation of some small but bright lighting devices.

ETA:  Should I have placed one lead of the led (+) to the 3v output and the - led lead to the common ground possibly?
See the Joule thief Circuit Diagrams, etc. topic here:
http://www.overunity.com/index.php?topic=6942.0;topicseen

Pirate88179

Here is a shot of the schematic if it helps.

I am still lost over here.

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