Joule Thief

[gadgetmall]

http://www.youtube.com/watch?v=Lu8uygSM9XM

@ all:

Above is a link to a video I made on the JT Coil Light.  I tried an experiment while making this video.  Since I have a good supply of the 3904 transistors, I decided to up the input power to see if it can take it.  I used 3 AAA bats to drive the jt toroid circuit and the output light is very very good.  Better than it shows up on the camera even though it looks pretty good there too.  So, it did not hurt the transistor or anything at all.

I know I can use an MK1 style toroid to achieve even better results using an AA battery, but I just want to see if the transistor would handle a bit more input power....and it seemed to.

@ IST:

Very nicely wound man.!!!

Bill

NICE ~~~ . I know this is a Stupid question but How did you get the plastic tube to Stay in a Coil ? Was it already a Coil ?
@ist . Good and Tight . i tried the Hv cap on Fugi JT no go also tried dc cap It makes the lamp dimmer.I think i have it at its best current draw with a cfl . 12 ma

@all for the new comers that don't want to read the entire Book and go straight to a Quick Guide . Here is one improvement we have made to a normal Jt . circuit total input is .81 ma and runs 4 Leds for months on a dead aa,aaa,c or d . Circuit is designed to run on less than 1 ma . I have this one still running since it was built . There are many more Circuits in the threads that are Very Good . Try them all !!

[slayer007]

@ slayer007

Congratulations. I think you are the first to light a CFL from a 1.5 volt AA battery using a transformer you made yourself.  I made a schematic that I hope is correct.

Thank you Xee2


Yes that looks correct,You could allso put a couple diodes on the transistors to pick up the back EMF from the JT.
To light more lights or charge extra batterys.


@ Bill Very Cool Idea I like that.

[gadgetmall]

@ slayer007

Congratulations. I think you are the first to light a CFL from a 1.5 volt AA battery using a transformer you made yourself.  I made a schematic that I hope is correct.

Yes i would have thought the Two Diodes would go to the Bases one one way the other the other way .. May not work on this circuit needs to be a two transistor astable i think  to get BEMF from two different directions .

[slayer007]

Yes i would have thought the Two Diodes would go to the Bases one one way the other the other way .. May not work on this circuit needs to be a two transistor astable i think  to get BEMF from two different directions .

The backwards one will work off the emitter of the 2n2222 it will allso work off the base.
Going off the emitter is 6v going off the base is 9v.
This is off a 1.5v AA.

For the positive there both going back to negative source.

Then you can pick up the positive back emf off the collector of the 2n3055

[electricme]

@Slayer007
I'm going to make a start on replicating your JT today, this looks like it may have great possibilities.
Welll done slayer.

@all
A couple of weeks ago I mentioned about my solar powered shed light.
On Monday I went and bought another two of them.
The solar cell puts out 7.93 volts O/C (open circuit, no load) in almost bright sunlight.
Connected to Battery, it reads charging at 4.01volts at .2 amp

This is pritty good.
If I get one more unit I could make up a 12v solar cell to keep my 12v battery bank "topped" up.

After dismantling the whole unit I found the wire leads out from the solar panel had almost no lead restraint, one good toug and the wire would pull out of the solar connection point, so I added some "contact" cement to this lead.

General Jim