Joule Thief

[resonanceman]

@ Gadgetmall:

Nice looking bulbs! Are they LED? Do You or anyone else have any idea, how to get them? Who ships them wordwide?

@ Gary:

I do not want CFL. I prefer warm white LEDs. As far i am experimenting, i did not get enough light for reading. I have put some Seebeck modules to my woodstove and charge a 1.2V rechargeable. Its a nice way to get your own electricity The next step - make enough light to read, do more experiments etc.

Knabe


It looks to me like  Gadgitmall has one set of standard bulbs and 2 sets of LED bulbs in the picture.

Can you purchase things on Ebay?
here is a link to the warm white version of the kind of LED I like right now.
1 watt each
10 MM so they dissipate heat pretty well.

I like  the plain white........they are a little cheaper.
I have 4 of them soldered together......they would make a very nice reading  light ........ you probably won't  have to use them at full power to read.

http://cgi.ebay.com/5-PCS-10mm-40-1W-Warm-White-LED-300mA-350-000mcd-NEW-/390226505227?pt=LH_DefaultDomain_0&hash=item5adb4fee0b#shId

I believe that most of the LED christmas tree lights are around 3.5 W
These  would be 5W total........for probably less than  you will pay for christmas tree  lights.........AND   they are so much easier to work with.




Now........ you have made some JTs that are not quite up to power.......can you describe the better ones.......what kind of toroid ..... how many primary wraps ..... how many secondary wraps.

Do you know  how to tune the primary ?

Do  you use a capacitor across the  base resistor?

Do you use a fixed resistor  or potentiometer for  your base resistor?



Gadgetmall

It is good to see you here again......

I have been trying to make a coil like that off and on for quite a while.
Do  you mind telling me what kind of wire  you used and how long  for primary and secondary?

The plug on the end is a great idea




gary

[gadgetmall]

OMG somebody call Lawrence

i Almost cracked a smile . OMG i almost forgot him and now...

Unfortunately to avoid controversy the secret will be buried with me  but it's not ou its conversion of energy from one kind to the other  . And also all the info is in this thread to build one .there are no hidden parts and was wound to meet the resonance of the transistor with the Torroid which is high perm .There are no caps but there is two components that are simple . I as others found that Current in is decreased as the draw from secondaries increases so i have one winding that is dead shorted , Its a secondary that is a coil of wire connected together and the other component is a tiny magnet on the opposite side of the toroid and transistor .Magnets act funny on a torroid i found and they actually detune a circuit from resonance so my thinking was detune it with the magnet and retune it with the wire length not using any tank circuit but the wire it self . The whole thing was then dunked in Rubber latex . The black tape holds the fragile secondary wires to my female plug  to keep them from breaking . The Components are outside for access . I built this maybe 15 months ago ?  You all keep on building them bigger and better and have  a MERRY Happy Christmas .

Albert  D.

aka Gadget 

[knabe]

Gary, maybe You are right, 40 degree angle is better for reading than wide angle. I already have 8mm wide angle leds from the same seller.

My best light source so far is solar garden light plate with one 8mm 1w led. Good, but not enough...

My own jts are worse. I used transformers from PC and long and narrow toroids, like these on PC monitor cables with about 10 bf turns. Wire is from cat5 cable.

I am waiting for osciloscope and C and L meter. So far i have best results from only basic jt without secondary. Maybe with osciloscope i will see better, what does caps and tuning. With no tools you are without eyes...

Yes, and singing is not for me. So i will use only plastic covered wires. Transformers sing too, so i must make my own toroids. If i need a big toroid for light, i dont know where to get this. Goldmine does not send to my country.

To summarize - what is the best toroid or what is the best jt for light in my case? Does anyone already built it? I am asking for easy way, i know Anyway i will go for light.

[kb24]

KB

The JT is  a very simple circuit ........but it is not the kind of thing that has a set of magic numbers that always work.
How many windings  you need will depend on your other parts.......especially the toroid.

JT 101  is a thread that has quite a few of the basics for making JTs
I suggest reading it first
http://www.overunity.com/index.php?topic=8341.0


gary

The problem that i was facing is that i thought my JT is not working but actually it does work. It work with 1.5V battery but when i connect JT with my earth battery, it cant work.

The situation is like this:
1.5V battery with JT can light up 5led <-- this is to proved my JT worked

My earth battery(around 12V, 0.3mA) without JT can light up 5led(low intenstiy)

when i connect my Earth battery with JT can only light up 1LED(damn low intensity). When i try with 5LED, nothin happen.

May i know why?? It seem like when i connect earth battery to JT, the voltage drop. But it still work on normal battery.

[The Observer]

Gadget,

Nice to you see you.
You don't know me, but suffice it to say that I am a fan.

You said,

there are no hidden parts and was wound to meet the resonance of the transistor with the Toroid which is high perm

                    Basically, I would like to know your opinion.
        How important are these two phenomena to you circuit designs?

                        1. Resonance.

                        2. High Ferromagnetic Permeability. (a high concentration of rotatable magnetic dipoles in the core)

I have deduced that these are vitally important to making an Impressive Joule Thief.
Do you agree ?

Best Regards,
                     The Observer