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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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.


mich posted this 06 March 2019

Hi everyone, I post my replication of Preva exp. that I did a while ago.


opposition phase20KHz version1


in phase100Hz version1

sort of akula coreversion2 sort of akula core

opposition phase5KHz version2

30Hz version2

The circuit was powered with a frequency from 50Hz to some kHZ and I observed that:

When the frequency is below 500 HZ the impedance is almost zero so the circuit is practically a direct line.

When the frequency is above some KHz, the impedance increases and the phase displacement of the two coils increases up to 180 degrees.

another observation: there is a considerable transformation of the current on the shorter coil, this confirms the Preva theory of current amplification, and the circular path of magnetic flux in the core.

if someone can confirm what I'm writing because I've always seen replicas of the experiment with very high frequencies and not as low as the ones I used. thanks

good day to all


Chris posted this 26 March 2017

Cd_Sharp, this is excellent! Thank you for sharing!

Some very simple observations shot:

  • One Globe is very much brighter than the other!
  • The other Globe, although illuminated, has a lot less Current through it!

This is such an important experiment! I wish people out there could see that have not done the experiment! I have done this experiment several times and learnt a bit more each time!

I think I might re-do this experiment for the Forum also!

Some data on my Coils:

Period: 3.320
Offset: 0.160
Degrees: 17.3
Active: 2.203788426168
Apparent: 2.30821
Reactive: 0.686403717929
Power Factor: 0.9547608

Period: 3.320
Offset: 0.28
Degrees: 30.4
Active: 8.0004243646859
Apparent: 9.275707
Reactive: 4.6938212608966
Power Factor: 0.8625137

Period: 3.320
Offset: 1.72
Degrees: 186.5
Active: -6.1948770793364
Apparent: 6.234956
Reactive: -0.7058169710592
Power Factor: -0.9935719

My Turns:

L1 Turns: 175
L2 Turns: 88


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.

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.


cd_sharp posted this 25 March 2017

Here is my replication of Mr Preva experiment using a nanoperm core and some UTP cable.

mich posted this 13 March 2019

Hi to all, I was particularly interested in doing the voltage-current phase shift test to better understand
the behavior of the akula core. Since the circuit is inductive, thus the current is delayed respect the voltage.

 misuration 20turns coil

The smaller coil 20 turns test. Trace 1 voltage, trace2 current: delay voltage-current about 25°. Freq: 1KHz


misuration  40turns coil

The greater coil 40 turns test. Trace1 voltage, trace2 current, delay voltage-current about 180° Freq:1KHz


misuration only currents shift

Here we see the phase shift of the two currents together, the mrPreva diagram with currents in opposite directions is confirmed like above. The smaller coil (trace2) is slightly out of phase and higher current, the greater coil (trace1) is in opposite phase and low current. I did not understand why the phase shift is greater than 180° probably due to inaccuracy caused by harmonic distortion I think.

the next step is to figure out how to apply this to akula, I accept suggestionssmile  hi!


Zanzal posted this 13 March 2019

the next step is to figure out how to apply this to akula, I accept suggestionssmile by!

Hey Mich,

Good work on your replication. It has been on my todo list for a long time now to try this replication using AC rather than pulsed DC as I did in the past, but the amplifier I ordered was lost in the mail, and I never reordered. 

You mentioned suggestions which caused me to wonder how Mr Preva would behave if four coils where used instead of two. With two coils for a primary the same as the MrPreva and two for the secondary also an identical MrPreva. Of course this is more difficult to test without an isolated oscilloscope and the results probably not very unexpected.. But you asked for suggestions, so I figured I'd toss it out there for you or anyone else. If I get a chance to test it myself I'll share the results.

Chris posted this 13 March 2019

Hey Mich,

Excellent work! Thank you for sharing your excellent progress!

In my opinion, a critical, most valuable experiment to do, to understand and set a baseline for experiments in the future! Now that you have taken this time, to take the step forward, following experiments will be very much easier and make more sense! You know what to aim for!

I would like to invite you to study and participate in the two threads: Parallel Wire or Bifilar Coil Experiment and Delayed Conduction in Bucking Coils.

Your contributions would be most welcome!


Atti posted this 15 March 2019

Hey mich.

It is also worth noting that if one of the coils is tied up in the opposite way, how the current strengths on the secondary side.
North-South or North-North roll coils.
When bigger and less power. Why?
Thus it is possible to refer to the presumed presence of magnetic resonance.
Good work.

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 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 

cd_sharp posted this 27 July 2017

I came back to this experiment because I think I need to learn more about it. Here is my basic setup:

with the yellow trace from the MOSFET gate and the blue one from the drain.


Then I unplugged the capacitor and both lights get dimmed a little, but the effect is still there:


So, the capacitor is not needed for this experiment.

I was unable to obtain current traces on the two lamps. When I tried to connect the scope probes over the two sensing resistors, input current went up and both lamps become equally bright.

I'm thinking that the cause is that the capacitors in the scope probes are generating parasitic oscillation.

Any ideas on how I would be able to obtain the current traces?

Chris posted this 28 July 2017


Cd, Zanzal,

At any one point in time, the Coils in the MrPreva Experiment, Buck Each Other!

They Oppose!

This results in a Gain, in the local Circuit, of almost twice the Current. Try to picture the Magnetic Fields, what they are doing, the Currents, and why they Oppose... Right Hand Grip Rule...

Then look at the other devices, like Don Smith:

For some reason, we, the human mind, has a tendance to way over complicate the simple, We need to force our minds to think simply!



Wistiti posted this 22 January 2018

Hi Vasile, thank you for your reply. If you look one post before the video I post, Chris post an image of the simple circuit I use. The capacitor is not needed.

For your information, I have not say it is over unity... Too much a big word! 

I have an oscilloscope, but not to familiar with it... need more time to learn with it... I also have a killawatt. The idea to share this experiment is to give to other the desire to do the experiment... it is really cheap and I think we can learn with it.

Hope I give you the desire to try it or any other Preva kind of experiment!

All the best!

Chris posted this 19 April 2018

Hey Zanzal,

Your question:

Would an induction heater be more efficient if two coils are used in a style similar to Mr Preva?



Answer to your Question: No, not as it stands.


@All Readers:

As we know the Mr Preva Experiment, is Symmetrical, it has equal and opposite Energy Transformations less losses. This is the reason it is, as it stands, Below Unity! Experiment shows: Current is Amplified, but we see a large Voltage Drop!

Electrical Energy is V x I, by loosing one and gaining another, does not constitute an Energy Gain! However, amplifying Voltage does not cost us anything! This is not a Transformation of Energy! No work is done to Step Up Voltage!

The next Step to The Mr Preva Experiment, is my Thread: Some Coils Buck and some Coils DONT

I introduce the Asymmetrical Energy Transformations, where the Input Energy is not affected, in anyway, by the Output Energy. This is the reason I have posted the Thread: Asymmetrical Regauging.

I see many are not seeing what I have been trying to show, many are not following the trail, not understanding posts I have taken time to detail effects and show where the open doors are. Its ok, I am ok if others do not want to learn.

However, if people want to learn how Energy Machines work, they will need to learn, need to start thinking in terms of Energy Transformations, learn how our Environment can introduce excess Energy!

Your Input of X Energy, is never, ever going to Transform itself into 2X Energy by itself!

You must Open a Door for the Environment to Add Energy!

The Door = Increasing the Rate of Kinetic Energy


Chris posted this 21 December 2018

Atti - Excellent Experiment!

You show exactly The Mr Preva Current Gain! This is a critical aspect of Above Unity Machines to understand.

We loose Voltage, Voltage is consumed by our Load but more critically Opposing Fields, known as a Voltage Drop. An Auto Transformer in Buck Mode is well known for this effect:


Auto Transformer in Buck Mode


In the above Auto Transformer Configuration, the Secondary Coil "Generates" an E.M.F of 100 Volts, then the output will be 240 - 100 = 140 Volts. We have lost 100 Volts, because we have Bucking Mode in this Auto Transformer.


Auto Transformer in Boost Mode


In the above Auto Transformer Configuration, the Secondary Coil "Generates" an E.M.F of 100 Volts, then the output will be 240 + 100 = 340 Volts. We have gained 100 Volts, because we have Boost Mode in this Auto Transformer.

So, we have learned that in any Bucking arrangement, there is an elimination of Voltage in Bucking mode. The Kapanadze Coil also is exactly the same configuration, it is only a partial Bucking arrangement. We have conformation of this from Ruslan:

The output voltage will be 195-200 volts. This voltage will not be higher. Why? Later we will return to this. It is necessary to rewind the transformer-reactor (Coil) so as to obtain the desired voltage. This requires experiments.

Ref: Ruslan K


Ruslan is a man of wisdom and avail. 



The Coils Coupling is well less than half Unity Coupling, the turns are 48 CW to 36, a difference of 12 turns. At least half of the coil was uncoupled, or loosely coupled. This is the reason Ruslan said: "It is necessary to rewind the transformer-reactor (Coil) so as to obtain the desired voltage. This requires experiments."

Magnetic Resonance gives us a gain in Current. To achieve this, we gain a loss in Voltage as shown. So we utilise Timing and a Stepping Up of Voltage with turns. But this requires Experiment, something I have also said: "Some fiddling is required".

So, your experiment proves a very valuable concept, that of Current amplification. To get to the next step, a little more fiddling is required. You already have one of the most important concepts!


mrblobby posted this 05 March 2019

Close but never touching.
maximum rotation strength.
Mr Prevas latest video,  plus a couple of images to illustrate what I think is going on.

The optimal distance to remove maximum energy


The part of a vortex that has maximum torque or turning strength.


Chris posted this 07 March 2019

Hey Mich,

I have a simple calculator here: AC or Sinusoidal Power Calculator

Hope this helps! Ask if you need help! Great job!


mich posted this 11 March 2019

Hi, I have rebuild the experiment and have found the negative PF in one of the coils, but I have yet to fill other tests.

these are the results:

sort of akula core trace1 (with current amplification)

1.03V effective

0.63A effective

Phase: 168º

Watt: -0.63

PF: -0.978

trace2(with lower current)

1.03V effective

0.25A effective

phase: 15º (approximate)

Watt: 0.25

PF: 0.965

thanks for support!



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