Joule Thief

[Mk1]

@all

I feel crasy tonight i made a drawing , it may not be any good but the idea is iron in a field becomes a magnet , a stationary magnet with a secondary on it would not generate anything but this magnet (iron ) is a pulse magnet , humm ...

Its also a transceiver emitting and receiving with the antennas one in the field and one out of it .

Plus and minus , or they could both be in the field with one antenna coil reverse polarize.

Mark
   

[jeanna]

xee,
Those are really wonderful results.
And, each turn is about 3 inches makes that a bigger coil than I was thinking it was.
The 4-6KHz sounds about right too.
Did the whine sound get quite loud on this one? You have various output voltages. Does the volume of the sound go up as the voltage goes up?

That is a really nice comparison study.

thank you for posting it.

jeanna

[xee2]

@ jeanna

I think the audio whine is from the turns vibrating against each other. I have plastic coating on my wires so there is padding between the turns. I hear some noise but not as much as with the Fuji camera.

[jadaro2600]

@all

Mobius !

@gadget

Tell us more about the one you made on a pole .

This mobius coil is interesting: however, I don't see how it's mobian in any way, it's just a  side-by-side 'gimmick-like' inductor.

I was wondering if anyone knows where I can get some decent iron powder? ..I want to attempt a sort of immersion coil, where I place the coils in an encasement of iron rather than having the iron inside the coil.

[electricme]

@Jadaro2600
Iron Powders, sure can.

I was wondering if anyone knows where I can get some decent iron powder? ..I want to attempt a sort of immersion coil, where I place the coils in an encasement of iron rather than having the iron inside the coil.

I will really look forward to seeing the results you get using this, as I proposed this method several months ago. 

Here is a site in Australia, there is a really good breakdown on the different size of iron powders.
It seems they even throw some of this stuff on the breakfast cereals also. (yuk).

If I discover more, I will post their web addys also

Australia    http://www.metalpowders.com.au/ironpowders/index.html
USA          http://www.micrometals.com/index.html  you can request samples from here
USA          http://www.americanelements.com/femp.html
USA          http://www.thomasnet.com/products/iron-powder-62453808-1.html

India very unusual powders
                http://www.tradeindia.com/manufacturers/indianmanufacturers/iron-powder.html

Another world wide http://www.hoeganaes.com/



jim