Please disproof this video- it could be a hoax

[gyulasun]

...
PS this is fake lol , the other commentators are covering it well

Hi Mark,

I do not know how you mean "this is fake lol"  but the core tests shown in the videos are not faked in any way, the test show reality with off the shelf core types.
part 1 http://www.youtube.com/watch?v=SHbQXnXK6Xc
part2 http://www.youtube.com/watch?v=BsN2sr3U0PY

rgds,  Gyula

[Paul-R]

I am not following this thread closely and so, may get this wrong.

It reminds me od Ed Leedskalnin and his PMH.

[mscoffman]

There was a demonstration where a 12VDC automobile battery is used to pass a very high
current through a "U" shaped piece of metal with an unattached straight pole piece
of the same metal slid placed across the top of the "U". After the high current is passed
the pole piece which becomes un-removable as if attracted by a strong magnet.
I don't see any scientific problems with this with specific types of materials in that the high
magnetization produces a temporary magnet of the metal pieces that reinforces itself
semi-permanently. I would be surprised if there where any residual electrical currents or
other AC voltage changes associated with it while the attraction is happening.

() Why would two extremely flat pieces of metal pressed together look individual to a magnetic field?
() Why would a metal ring behave any differently from a toroid in a previous generation
of computer memory used to permanently store a low intensity magnetic field in a
small metal core?

This is just a demonstration of production of a permanent magnet by an electrical current.

:S:MarkSCoffman

[gyulasun]

I am not following this thread closely and so, may get this wrong.

It reminds me od Ed Leedskalnin and his PMH.

Hi Paul,

Yes in the sense that the cores in the video are U shaped and are closed and also at least one core has a coil, then indeed the setup may remind you a PMH.

The tests in the video were done by member Nali2001 a few years ago and his purpose was to show how differently some common ferromagnetic cores behave when a coil on them is DC-pulsed like in many pulse motors or even motionless generators etc. 

Gyula

[jadaro2600]

Ok, I didn't catch the second video. I wish I had seen that, It might not have even warranted such a long reply. I think this confirms the interference I was speculating about. No need for a complicated setup as I had mentioned.

In the second part of the second video I'm seeing the initial primary act just like the secondary.

I think it's also safe to say that there is no current induced in the secondary when it's not shorted, or at least there is no ability for it to flow and induce a magnetic field which would hold the cores together.

I agree though, cores can be surprisingly different. The one in part two looks like it doesn't maintain a residual flux when there's no inductors present with a load or a short. This would indicate to me that they're intended for running cooler at higher frequencies where the circuit is driven outside of it's natural resonance. I wonder what it came from.

It would be interesting to try this with a ferrite core; this may have some applications in increasing the efficiencies of the joule thief circuits.