The MrPreva Experiment

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.