Joule Thief

[xee2]

I am not sure what K is. It is not permability. Here are some common symbols.

[jeanna]

Could K be flux density?
My modified numbers seem in line. Please delete my quote so the mistake is gone.

Here is the page.
I know you know this.
I do not know the question even!!!

jeanna

I backed into this because I knew the inductance and the dimensions.

[xee2]

Could K be flux density?
jeanna

Relative permeability is permeability divided by the permeability of free space. Google it. I am glad to see you are working with this site. It gives the best understanding IF you can understand it.

permeability of free space = 1.2566371 × 10-6 (μ0)

but I am not sure about the units and they make all of the difference.

See if dividing 10,000 by 1.2 gives your K value for TOR-60

[broli]

@Stefan: Lidmotor has some youtube videos using a 555 timer, it could be modefied to operate a mosfet instead of a transistor. But notice that this would start to resemble the Rosemary Ainslie COP 17 Heater.

http://www.free-energy.ws/images/circuit3.jpg

Basically all these concepts boil down to very high voltage spikes that exceed unity. And apperently IST and gadget have experienced that ultra capacitors can absorb those better than batteries.

[jeanna]

Xee2,
I have bookmarked a site and I will enjoy learning more from it.

Right now, I am wanting a way for us to be able to quickly find a source of good toroids based on our historical successes.
And, right now, we do not know the properties of the more successful toroids, so how will we ever be able to locate a good batch and stop wasting our time and money on the wrong thing.
I wasted about 36USD on a bunch of 60 and 120 u  toroids. I am sure they work well in some application, but as a source of pulses in my JT dynamo, they are terrible.
I will try the high permeability toroid once again, but I think it is the same problem... just on the other end.

My good toroids fall into a range. I will be trying the new one soon and I expect it to be a little less good based on today's figures.

I would like to know what the figures represent.
It looks like u_r which means relative permeability.
but what is that?
Does any manufacturer use that?

Thanks as always for your help,

jeanna