Hi Groundloop,

Does the two ferrite rings have differing permeabilities or they are more or less equal?

If I read correctly, the two cores must differ in permeabilities.

from http://science.blogdig.net/archives/articles/July2007/04/Free_energy_with_magnetic_reluctance.html :

Heins adds that he and his colleagues ?have coupling from the primary to the secondary. The reluctance flux path in the secondary is lower because either the secondary core area is greater or because we employ core material with a higher relative permeability which results in a decrease in reluctance. When the secondary reluctance is lower - back EMF induced flux from secondary coil 1 must follow the path of least reluctance into secondary 2 and not back to the primary. The primary operates only at magnetizing current levels (reactive current only) and does not draw any non-reactive current from the source. The law of conservation of energy for a transformer requires secondary back EMF to be able to mutually couple back to the primary - but if this flux path is higher it will not be able to do so.?

Thanks for the test.

Gyula

from http://science.blogdig.net/archives/articles/July2007/04/Free_energy_with_magnetic_reluctance.html :

Heins adds that he and his colleagues ?have coupling from the primary to the secondary. The reluctance flux path in the secondary is lower because either the secondary core area is greater or because we employ core material with a higher relative permeability which results in a decrease in reluctance. When the secondary reluctance is lower - back EMF induced flux from secondary coil 1 must follow the path of least reluctance into secondary 2 and not back to the primary. The primary operates only at magnetizing current levels (reactive current only) and does not draw any non-reactive current from the source. The law of conservation of energy for a transformer requires secondary back EMF to be able to mutually couple back to the primary - but if this flux path is higher it will not be able to do so.?

The above also says that the secondary core can be of greater area, though it sounds like Thane used the permeability difference trick. I was thinking more of replicating the toroid setup in video 4 but this certainly seems easier. Thanks for bringing it up Groundloop. I missed it completely.
-Steve
http://rimstar.org

Steve,

I found an old PC power supply and can use two of the Ferrite cores from that unit.
They are made of Ferrite and of different size. It will take three hours to wind the cores.
Then I will build an oscillator as shown in the attachment to test the cores.

Groundloop.

Groundloop,
Do you mind if I print at least your diagrams to show Thane on Monday for his feedback? I found that back when I was visiting David Hamel, bringing my replication helped a lot since he pointed out details I would never have thought to ask about.

Luc,
Do you have a colour printer? That would be much much cheaper than going to a shop to get printouts.
-Steve
http://rimstar.org

Hi Groundloop
with the Switch SW1 in your circuit:

(http://www.overunity.com/index.php?action=dlattach;topic=4047.0;attach=17412)


you can easily switch in and out the MMF coupling of the cores,
thus if you do it very fast and maybe with a spark gap you can
make very nice BACK-EMF pulses at the output coil !

So you could convert all the flux in the second right core to ouput power
without drawing additional input power, if you open up the switch.

It is a very fantastic and easy circuit !
Congratulations !

Regards, Stefan.

@hartiberlin,

I guess it is possible to switch in and out the magnetic coupling like you say.
Maybe have a switch on the output also. Then one can switch off the coupling
and switch in the load some nano seconds later. Just theorizing here..........

My first job will be winding (threading) the new coils based on the cores shown
in the picture. Next job will be soldering together an oscillator with feedback.
It will be easy to see if the output > input when connected to a lead acid battery.

O/U or no o/u, it IS a fun hobby to play with electronic. 

Groundloop.

@gyulasun,

I did some measurements for you.

When I short out the output (L3) I could NOT see any difference in the input power.
When I measured the current in the shorted middle coil I got higher current with a shorted output than without.
(The middle coil L2 was shorted in both cases.)

The meter I used is NOT very accurate so I can not say that this result is 100% correct. It is only an indication.

BTW: The cores is relative new. Less than 3 years old.

Groundloop.

Thank you very much.  Very good news!  Indication is just enough for this test I think.

Here is a link to Amidon (in fact Micrometals) toroid cores. They have a wast amount of core types:  http://www.qsl.net/ok1dxd/amidon.htm   Your Yellow/White is for low frequency filters / chokes as it turns out. But your pale Green/Blue I am not sure... 
The best would be to wind 10 or 20 turns on it and insert it into an oscillator for frequency check (unless you happen to have a inductance meter)  and recalculate its inductance from which the permeability could be found out...

rgds,  Gyula