Joule Thief

[Mk1]

@gary

I made one with a piece of copper tubing , the piece you can see on one of last page photos.

[jeanna]

Jeanna

You  seem to be describing  a  hard way to make a LM coil

A one inch  toroid like the  5 for $1 toroids fit  perfectly inside the   center of a radio shack wire spool ....in fact  2  of the   5 for $1 toroids will  fit .

I think I always liked your LM  for that reason.
I do not like any of my medium 5/1 toroids.
I always end up with a really weak secondary when I use it.
I did follow that suggestion you made with the red spool, but it was really only successful when I used it on a NS coil. So the interior was cylindrical bifilar.
It worked pretty well.

But even though I wanted to see the outside, what I really want to see is on the inside of the toroid core.
I think there is some action in there that is perpendicular to the ring of the toroid.
I am going to see if I can make this with 2 toroids upside down to each other with a straw wrapped with a coil.
The thing here is if the mag field IS spiralling up through the center of the toroid, I will not be catching it this way. I would need something that crosses the lines...
So, perhaps a larger ring around the outside perpendicular to the stacked rings, so it is in a way that crosses the field.

Maybe I can get the spool to do that for me.

But here is where we need to make our own.
I can use some wire to make a ring the right size... and I will be watching your results too.
Someone a long time ago... was it IST? did this. theNOP said he was using florist wire but I do not remember any reports from him.

If  you  put  your primary  next to the   core   I believe you can get by with  5 or 6 wraps   .......it takes more like 20  wraps  if  you  put your  primary on the outside .

Oh hmm. That is interesting.
And, yes it does go along with what I was thinking.
Thank you,


@Stprue, Thanks for the pix. I will study them.

@MK1 Wow, I love the quad!
Please report when you get any (even disappointing) results.
That has great promise.

jeanna

[stprue]

@All

I posted this on the sm topic but though it would be good here as well.

What do you think of this little test!!!  It is kinda like a small tesla hairpin circuit.  The interesting thing about it is that it is lighting an led on a different JT circuit...no contact.  Also you can see voltage reading off my DMM that's connected to my JT!  What are your thoughts on this?

[kamax]

Hi,

The setup of stprue give me some idea and have played with my joule thief. i don't know what i have really done but it looks like i have decrease the milliamp of my joule thief.

Without any load on my transistor i read ~50ma(is this normal?), with a led it's only ~1ma more.
I have make a coil with a crystal core and have connected it to the two wires going out of my normal toroide. For the input of the crystal core coil i have make it like a joule thief toroide, one wire from opposite side.

I can put leds in the two directions on the output, they will light but are stronger in one side. Looks like i have AC. The stange thing is that if i put a led in the strongest side, i read less milliamp going out from my battery. More leds i connect less mA i read but it don't get to 0mA. When i reach ~36mA and connect more leds, it get more mA.

It works with a toroide too instead of the crystal core coil but instead of taking a wire from different side for the input, i must take the two wire from the same side.Very strange.

Here is a video: http://www.youtube.com/watch?v=_O9jrp0tHT4

[innovation_station]

HOT DOG!~!!

Lol

YOU ALL SEE THIS ... 

THIS IS A TRUNK AMP...

I HEAR YOU CAN TUNE THEM

FOR THE YAGGIES ...  WE ONLY EVER USED THEM ON THE 900 MHZ UNITS ... 

BUT THE TRUNK AMPS IM PICKING UP TOMMOROW .. ARE 1 GHZ ...   

SHIT ... I DONT KNOW HOW MANY WATTS ... I BET A FEW THO ..

THIS IS A TRUNK AMP ...

http://www.c-cor.com/broadband_access/files/products/FM901eT-AT-1106B.pdf

AND I DONT THINK THE ONES IM GETTING ARE THE EXACT SAME ... BUT FORSURE 1 GHZ



PROBALLY DROP THE CELL TOWERS IF NOT USED PROPERLY ...

THE THING I DID LEARN WAS THE CABLE MODEMS .. CAN BE USED AS WIRELESS WITH THE CORRECT ANTANNAS AND AMPED OF COURSE ..

IST!