Joule Thief

[innovation_station]

 

ist!

[infringer]

I have an idea for you ist why not sell mod kits to modify mp3 players and wireless computer mice and other portable electronics....

I see a great market for that!

Hows that for innovation at your station. I would love to have one myself I can solder and such myself. Or even a single unit for charging that would double as a case for the player.

-infringer-

[gadgetmall]

@IST WOW !

That Look like an Intergalactic FLux  Star drive Capacitor !!  Or the Key Element for the Stargate SCI FI Man SCI FI. .. Definably undercover Gadget !

@All Thanks for the comments for the Video of my  Selfcharger . Im hooking it up to a Voltage Divider +joule thief and run some white leds for a perpetual lighting system . I have two more im going to build and put those on 2 Big 200 pound 6 volts and see if i can do anything with those ..I'll have more Vids comming  of this one and the other two when there completed . 

[Pirate88179]

@ Freezer:

Great video!  I would have never thought of that.  Great job!

Bill

[jeanna]

Hi everybody,

I will be concise, if I can.

I found a pretty good limit to the 30 led array by putting a 12K resistor at the base of the 2N3904 transistor on my hybrid joule thief. This is the same one I used yesterday to test effect of thickness of wire on a single turn secondary.

With the 12K resistor and the 10 ohm (9.5) ohm resistor in series at the pos battery terminal so I can interpolate the amps, I can see the lights, but they are very dim.

The total Amps drawn by the circuit is 0.062V / 9.5 = .0065A OK that is 6 1/2 milliamps. for all 30 or about 220uA each. cool - but I can hardly see them. If I use the same secondary wrapped one time on 1 led, it is bright. So at 6 1/2 milliamps it is bright. I know that to be the right amperage to make this particular light shine brightly, so, I believe this number.

Now, to compare the amperage or voltage of the circuit when this single turn secondary is connected to the array.

They are all the same.

Again.

What is different is the brightness of the lights at the same amperage draw and with different thickness of wire of secondary.

But it is the reverse of what I expected.

The thinner wire is brighter than the thicker wire.

Maybe someone else can run this test for us. I think it needs to be replicated.

I did do this over a few times, because it is so unexpected, but it would be great if someone else could have a whack at it. You don't need to have 30leds, just 6 will do.

Use a 12k resistor at the base of the 3904. If you do not have an ammeter, use a 1 ohm or 10 ohm and ohms law to figure the amps draw from your battery by your joule thief ckt with this highly restricted base. Then wrap one time around the jt toroid using a secondary and place the ends of this secondary wire on either side of the 1st led, then repeat with a different gauge wire.

I got 3 levels:
verrry dim - 30 gauge
much dimmer - 24 gauge and
barely visible - 22 gauge .

The thicker the wire the less bright the array.

I guess this makes me really say this is all about frequency to the point that even the secondary wire is involved in the frequency. The heavier wire I suppose should vibrate more slowly than the thinnest wire.

What do you think?

Thanks to xee for the directions to restrict the base current.
Thanks to MK1 for suggesting an in depth look at the thickness of wire question.
Thanks to jesus for his upcoming drawing.

ooo la la,

jeanna

I will check the rectified voltage and edit this when done. I forgot....
EDIT:
the rectified voltage across the ends of the secondary turned one time around the toroid is 1.11v on all of them. [just for the heck of it, I went around the middle one a second time and the rectified voltage was 1.86V.-but we knew that already.]