The MrPreva Experiment

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admin posted this 23 March 2017

I think this is perhaps one of the most important experiments anyone could do! A huge amount of information can be learned by running this very simple experiment!

The MrPreva Experiment Circuit

Please Note: The Current's (I), add, Floyd Sweet talked about this specifically:

In the specific case of positive charges moving to the right and negative charges to the left, the effect of both actions is positive charge moving to the right.

Current to the right is: I = da+ / dt + da- / dt.

Negative electrons flowing to the left contribute to the current flowing to the right.


The total Current, is the Sum of the both Currents!


We see, 2.8 Amps (da+ / dt) + 2.3 Amps (da/ dt) = the shown: 5.1 Amps as Floyd Sweet told us.

We see a Negative Power Factor, where the Voltage (V) Current (I) are out of phase by a Degree, which results in a Negative Power Factor!


Where theta is the Phase angle in Degrees. EG:

cos(180) =  -1


You will see there are some problems with the MrPreva Circuit, and it is explained, because, the Current (da- ) has become a Generator, or a Battery, which is the only time  Kirchhoff's Current Law does not hold in an applied situation. 

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Forelle posted this 3 weeks ago

Hi Patrick,

how do you came up with 140%?

26,93 divided by 26,6%=1,012

and due to measurement errors i am sure it is under 100%

Have a good day

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patrick1 posted this 4 weeks ago

certainly,,,,   here is the video i made about that experiment,


sorry i took so long too reply, im off reading other treads, some of which look even more promising

ummm  *creams pants, romanian ZPE thread is  determining my builds this week,

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Atti posted this 5 weeks ago



i think i got about 130% efficency,


Can we see something more about this?

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patrick1 posted this 5 weeks ago

Forelle, well done !! i think its amazing.  - also my Preva was successful too !!. i think i got about 130% efficency, , nearly as good as your 140%...  so very consistant,  but if you can spot and other improvements that would be amazing too !!.... afterall, the russians have glowing nichrome wire, -  we can have globes. - ....   anyways its only a competition if your coming second !! rawr

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Forelle posted this 18 July 2019

Hi everyone,

I think there is no need for a new thread,all i think is that this experiment is not finished because there is a lot more to investigate,the sad thing is that it is much easier for me to built a motor or generator than to actually tune or adjust a device like a transformer.I have no problem with proceeding publicly but i allways think what i am doing  is not intresting enough for others or worth to show.Maybe when i have finished the Mr. Preva Experiment i make my first video.

Have a god day.


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Chris posted this 18 July 2019

Hey Oliver,

Please feel free to create a new thread for your Device Under Test ( DUT ).

If you wish to proceed publicly, that is?


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AETHERIC_MIND posted this 15 July 2019


Here is a link to the elaborate explanation to this type of negative resistance by Gabriel Kron.


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Forelle posted this 14 July 2019

Hi everyone,

i am still experimenting with the Mr.Preva setup and measured in and out,which did  surprise me.

In from Audioamp 12,67V and 2,1A=26,6W

Out first coil 12,25V and 1,25A        =15,31W

second coil 11,62V and 1A              =11,62W 


I never had something i measured more out  than in it is a very small difference and the measuring devices are not very accurate but if it would have 95% it would be a very good transformer for the size.The 180°phaseshift was at 744HZ,one coil had 40 turns and the other 60.It is the same device i have shown some posts before.

Have a good day.


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getreal156 posted this 15 June 2019

Hi Vidura,

Very interesting indeed. During my experiments I also tried several 1:1 ratio coils. None of them showed any good results (so far).

This seem to confirm your statement about the need for more windings in one coil to create a higher voltage. Why and how this works I don't understand (yet). I will however keep experimenting with the 1:1 coils. My gut feeling is that there is much more going on and we have to get to the bottom of it.

I'm not convinced that the bigger coil should be wound from thinner wire. The best results that I have seen so far come from a type of coil where L2 is wound over L1 on a single bobbin and put on an E core. Similar to what Akula showed. Both L1 and L2 have the same wire size (2,5mm2 stranded PTFE insulated wire) and a 7:23 winding ratio. I could be totally wrong but my personal experience in my devices is that bigger coils with many windings give less output. I speculate that this might be due to heat generation in the coil (increase of resistance).



Chris posted this 14 June 2019

Spot On Vidura!

You're exactly right!


Vidura posted this 14 June 2019


Hello All!


The last couple of days I have done some tests with  different coils to replicate the Mr Preva effect, using the new Switching Tool. But to my surprise the effect was not present, although I used various different coils, cores, frequencies  and capacitors. Then I hooked up the audio amplifier, feeding a pure sine wave but still nothing, a couple of times very unstable it seemed to be present, but it resulted to be  false readings due to double triggering of the scope. So I thought what is going on here, haven't I done this many times before ? The problem was that I sometimes have failed to document my experiments properly, the issue was very simple , I made the same mistake as in my first  replication intent's : A reversed connection of the coils. The reason I post this here is that maybe it can help for some to avoid to make the same mistake , and hopefully  to understand more clearly the principle of the opposing fields and Lenz' Law. Using my (mistaken) logic I connected the setup in a manner that the magnetic fields according the right hand rule opposed, BUT in the conventional current direction not 180ª out of phase! The correct polarity is that the fields must oppose when One of the coils has the opposite current direction(when the effect is present). When I corrected the polarity of course all the coils showed the effect clearly, also with the H-bridge and short square wave pulses good results as with sine AC.




For a clearer understanding of the effect just imagine a conventional transformer under load, the current in the secondary produces a magnetic field which opposes the primary field(bucking equal magnetic poles), thus the reduced impedance effect makes the primary current rise.  This is the well-known Lenz Law.


Now in the Mr Preva experiment we have to understand the timing  and how the inductors behave when potential is applied. Any inductor when a voltage potential is applied to the terminals  instantly, before current begins to flow the inductor will have an  equal and opposite voltage, which begins to decay, while the current is increasing. The smaller inductance will increase faster, and the associated changing magnetic field will induce a voltage in the second, larger inductor. Due to the winding ratio the induced  voltage will be greater than the source voltage, and will cause the current in the second inductor to flow backwards  against the source potential and return forwards thru the smaller inductor, adding to the original current. Thus the increment of current in this experiment. 




For the next experiment i will post results in the "delayed conduction Thread", I want to reproduce the reversal of current with equal inductors-windings by introducing a switched delay in one of them.


Regards Vidura.


getreal156 posted this 13 June 2019

Hi all,

I saw this one that I think belongs to the Preva list.  Very interesting experiment

Later I will post some info on my own device.



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Forelle posted this 12 May 2019

Hi Chris,

thank you,next step is to delay one of the POC with a Mosfet and Zener or similar with 3 coil setup.Every day its getting a little forward due to this forumlaughing and the good spirit of everyone here.


Chris posted this 12 May 2019

Hey Forelle,

An excellent example of how the Currents are 180 degrees out of phase! Well done!


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Forelle posted this 12 May 2019

Hi all

Now i have made the Mr. Preva experiment so good i can to prove the point,not so as the original where you see the wire glowing on different sides ,but you see that in one branch is more current flowing than in the other and the 180° phaseshift.One coil has 40t and one 60T ,no capacitor.

In the first picture you see the setup with both lamps glowing at 37Hz.

In the second you see the waveform of the current.Both the same 10mv/div,one div.1Amp

In the third the shifted phase at 887Hz.

And in the fourth only one lamp glowing.

Have a good day.

Atti posted this 09 April 2019

Hey Mich!

This is not Joe Flynn's invention! This is not the arrangement of the arrangement or the coils!
This is the invention of Árpád Bóday!

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mich posted this 25 March 2019

Hi, you last post Atti seems a lot to Joe Flynn invention, only the magnet are  in internal position instead of external, I try this kind of enbodiment several years ago, finding only the Force moltiplicatioin in the core as Joe said. Certainly you are ahead with the work. thanks 

Chris posted this 24 March 2019

My Friends,

I do apologize, we may sometimes have Translation problems with some posts. I am sorry if this happens, I have not finished the Universal Translator yet. wink

Atti is right, please do not delete any posts.

If there is any posts that may come across as offensive, please private message me and I will sort it out!

Guys, these experiments are excellent! Please keep the good work up!


Atti posted this 24 March 2019

Hey Mich.


- Do not delete any posts.
- Everyone's comments are important, you can learn from everything.
- My intention to comment was not offensive.
-If you can do all the experiments, walk around properly.
Draw conclusions.
Read everyone's comments, but don't trust anyone.
Only in this way can you progress your work properly.
Precise measurement does not always have to be done, often enough to find out what happens in the circuit. The Mr Preva layout is important, but you don't have to wait for a miracle. But the layout must be kept in mind. I'll tell you another example, but it doesn't necessarily belong here.

I investigated Árpád Bóday's magnetodynamic invention.
Take two parts.
-The primary drive with bridge H, with a 25% -25% filling factor per transformer. The remaining 25% should be the fill factor for the permanent magnet line.
-The secondary side switching can be divided into two parts.
Load and backfill.
There is a MrPreva "theory" within a transformer.
24V and 12V. forms of binding. The effect is important. Magnetic resonance is important. The load on the backfill is important.

Yet the road to pleasure is stubborn.

Kapcsolódó kép

Kapcsolódó kép

Képtalálat a következőre: „bóday árpád”

And finally, don't listen to me because I'm just a student.

mich posted this 20 March 2019

hi to all, with this I hope to answer Atti's suggestion,

the experiment looks very much like another experiment of an brasilian boy, concerns a kind of resonant transformer.



Frequency 1KHz. The power supply is via a sinusoidal generator and audio amplifier, the lamps are all perfectly equal (2.7 ohm), the current is detected with toroidal cores, it is not an accurate measure but I am only interested in having an idea of what happens. In this case the current follows the law of the resistive divider so only the lamp with the highest voltage drop is switched on. The traces are currents, 50graus phase shift.




Frequency 7KHz. In this case the situation changes and we have a current circulation between the 2 coils L20turns(blue coil) and L40turns(black coil). In fact, if the lamp is removed from L40turns(black coil) the phenomenon does NOT occur and the other lamps light up together with ANY frequency with identical and halved brightness. It's remarkable that the power is greater on lamp L20turns because as we have seen previously the phenomenon of current amplification is verified. 131graus phase shift.


Now the current sensing is moved to the common line.



Frequency 1KHz. L20turns current test in comparison with the total current, we see that the power absorbed on the lamps follows again the law of the resistive divider. There is no phase shift, note the amplitude of traces.




15KHz frequency. Trace 1 current on common line, trace 2 current on L20turns (blue coil). The frequency is higher to demonstrate the phenomenon more clearly, it is important to note how much the current that circulates between the 2 coils increases, and how low is the overall current absorbed, (to be confirmed). here too we have no phase shift.

EDITED: I think this exp is important although I have not completely understood the phenomenon. The overall power seems to be less, but in reality there is absorption. Soon I will correct the parts where I made some inaccuracies.

thanks good day

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