Self running coil?

[gyulasun]

...
The vishay si1026 specs don't seem to measure up to
this one, unless I read it wrong.

Hi Mark,

If you study the data sheet: http://www.vishay.com/docs/71434/si1026x.pdf 

Rds ohms max = 1.4
Id amps = .5
Vgs(th) min = 1
Vgs (th) max = 2.5
Vdss Volts =  60
Ciss pf Max = 30
Crss pf Max  = 3
ton ns max = 15
toff ns max = 20

And these data are for a single device and I suggested using two in parallel because they are manufactured as double devices in a single SC89 SMD case.  NextGen has just mentioned using two such SMD cases also in parallel, which would mean 4 single MOSFET in parallel, this would still have about 120pF input capacitance but Rds would be  about  .35 Ohm.

Folks, another notice from me: On using some piece of core in the pick up coils  I meant a rod shape like a ferrite rod piece, not toroidal shape, ok?
And for the pick up coil I also meant a cylindrical, multiturn, multilayer but short coil, ok?

I understand also if the presence of any core near to the toroidal coil would detune it, then there remains using multiturn air core coils of course.

rgds, Gyula

[wings]

Luc,

from your video is evident the difficulty to tune to the resonance.

A suggestion is to use the output coil ... check the maximum voltage and frequency spectra using the oscilloscope.

It is possible to control the frequency directly by this coil in order to have stable max output?

Other possibility insert a piezo sensor (from piezo microphone or buzzer) between the magnet and coil.

[mscoffman]

Yes, Nextgen76 and gyulasun these all sound like reasonable solutions.
I was not thinking of running transistor device in parallel in a working
experiment but that could work. My thinking was edge down the path
of reducing Ciss to some extent seeing if we maintain overunity then
reduce it even more while letting Rds rise slightly to see if Rds is even
important. We may or may not get overunity energy but we should get
some answers. If conservation of energy holds fast we will simply be
exchanging one set of question for another set, but I don't expect that.
What I think may be happening is most of the coil magnetic lines bypass
the not yet fully saturated toroid core, but the ones that do displace
some field lines anchored in the magnets...those displaced field lines
of the magnets may be overunity ones

I was really surprised at the spread of Ciss in mosfets. I saw one that
was 6700pf...These are pure DCV current switching devices. Some have
Rds =1milliohm .001ohms! These switching applications can withstand
the high Ciss gate values because they are behaving like lightswitches.
Internally they are bunches of on-chip mosfet devices in parallel.

:S:MarkSCoffman

[gyulasun]

Hi :S:MarkSCoffman,

That is fine I agree.  I think the Rds value is an issue too because it is directly in series with the toroidal coil and you can consider it as if it were part of the coil wire resistance, causing loss.  In Luc's present circuit the less than .1 Ohm or so Rds value is very nicely negligible  wrt his coil's nearly 7 Ohms copper resistance, meaning the loss on the drain-source path is very low.

On the Ciss issue: yes, from the manufacturing process it comes that Ciss goes up to as high as 6-7nF when the Rds is wanted in the milliOhm range, a result of parallel connections inside the case.

rgds, Gyula

[HarryV]

HarryV,

You are right in a way.

If the core have a reaction, then the magnet has its counter reaction, I was not clear enough in my idea... What I tried to point out is that the effect we seem to have [the pick-up coils having no influence on the input energy] is caused by the core its domains [and not the magnet vibrating itself].

If you 'tight up' the magnet and the coil together, so that the motion of the magnet is very restricted, this would have a better outcome for the mentioned effect. I do not want to go to deep into this, because it might open a lot of side way argumentation, which would be not a good idea for the progress of Luc's work;)

However, I hope to make it clear what I mentioned before.

Note that this is based on Luc his pick-up coil position, in which he says that the position he found is the best place for optimal receiving of energy.

--
NextGen67

Well, I think luc's effect requires the motion of the magnets because the motion of the magnets induces a current in the coil. If I am right clamping the magnets will reduce the effect.

Otherwise I don't see how the rotation of the domains by themselves could lead to overunity.

The question is does the energy required for rotation equal or exceed the energy of the induced current due to the motion of the magnets. If it does, then it is not overunity.