Meggerman & other,

I do obtain BEMF over the scope screen size (more than 700V) in similar conditions!! 

Listen to Otto...the key is in using a VERY VERY FAST  & HIGH CURRENT (low input capacitance) latest generation MOSFET = IRF 840 ...... I personally do use IRFP450 because I already had a lot of them  (Their are similar but the 840 has a faster rise time i.e lower input cap).

Roberto

Meggerman & other,

I do obtain BEMF over the scope screen size (more than 700V) in similar conditions!! 

Listen to Otto...the key is in using a VERY VERY FAST  & HIGH CURRENT (low input capacitance) latest generation MOSFET = IRF 840 ...... I personally do use IRFP450 because I already had a lot of them  (Their are similar but the 840 has a faster rise time i.e lower input cap).

Roberto

Excellent. Now try without the collector going through the center of the coil. Everything else exactly the same. What voltage measurement do you get ?

Hi Otto,

Thank you for the clarification on the circuit diagram. That definitely clears up the TON of confusion that I was experiencing 

@bob,

I'm going to be retesting this circuit as soon as I get home and you can bet that I will post lots of scope shots and photos (I'll probe it to death).

@Otto,

Ok, one quick thing, what pulse width did you use to get your best results? I'm assuming a very short pulse as I have been able to get 350+V spikes on some of my TPU experiments with extremely short pulses.

Also, I know someone else asked this but it would help to know how much amperage you are pushing through the coils. The 25V power supply I am using is current limited at 0.5A, though a simply 9V battery will push an amp easily (but it's only 9V though). So having some idea of the current requirement will make accurate replication easier too.

Finally, having some idea of the frequency range you are working in would help. We know that everyone's coils will have a different 'sweet spot' but were you finding this in the low kHz, 100s of kHz or MHz range?

God Bless,
Jason O

http://www.ibiblio.org/kuphaldt/socratic/output/resonant_instructor.pdf

The above is a primer on resonance, for those of you that have forgotten the unintuitive effects of resonance/self-resonance in a circuit.

Take a look at question 8.  250mv AC input. Calculated voltages of over 4volts. That's 8 times input without a sniff of back EMF.

The 'Q' of a resonant circuit (see page 16) is defined as:

   Voltage Across Inductor/Voltage of Source   when at resonance.

You can easily have inductors with a Q of 50 to 100. Even up to 1000 with additional capacitor. That means on 12 volt input you could get observed voltage across an inductor of 600 volts with a Q of 50 at resonance. Resonance is the 'sweet spot'.

As you change frequencies the effective impedance of the coil changes from near enough 0 (high amps) to extremely high impedance (low amps). After all this is exactly the principal on which simple band-pass filter work. The principle of a cross-over network in your speakers to split bass and treble.

This is clearly what I observe with my circuit.

Hi Bob,

You make some really great points about the behavior of the circuit, and I believe that you have perfectly characterized its behavior from the standard perspective. But we must also realize that there may also be Radiant Energy effects taking place in addition to the standard electrical resonance effects.

Taking a few steps back, let?s consider what RE actually is. We know that Tesla worked with the stuff extensively with his spark gap experiments, which is all very well documented in his research papers and notes. He first noticed the effect when a switch was first tuned on and off. Now, one may play this off as simply inrush current and BEMF spikes but if you read more into the subject, you find that this oddball electrical effect does a whole lot more than make kicks.

When Tesla started doing experiments to duplicate the effect of the mechanical switching, he found that turning on and off a spark gap abruptly with ever decreasing switching time increase the intensity of the RE effect. When this occurred, he could create all kinds of effects ranging from cooling effects, to anomalous charging of nearby metal objects. He also noted that he felt pain from the discharges, which appeared to be unshieldable, even with a grounded faraday cage or led plate surrounding the discharge zone. I won?t go into further detail about all this but the point is that there could be more going on here in this simple circuit than what is predicted in the standard electrical theory. However, if you look in the physics world, there is nothing miraculous about this at all.

My understanding is that RE is simply super high-energy photons from the vacuum, or put simply, pure potential. This stuff behaves exactly in the same way as normal light photons in how it interacts with the electron. When we pulse our coils and abruptly shut off the flow of current, the radiant energy potential is ejected from the wires at 90 degrees in all directions. We can pick up a component of this discharge as an abrupt increase in the radial E-field around the wires. The intensity of this ejection is proportional to the applied power, and the speed at which the current is started and stopped. Keep in mind that all of this is in addition to the regular resonance and BEMF effects that we would expect to see.

When this high energy potential comes into contact with the electrons on neighboring metal objects, these photons increase the kinetic energy of the electrons in the wire, just like light striking a mass imparts momentum to it. There is nothing mysterious at all about this. So the whole point is that we can decouple the potential in our pulse coils from the source (transfer potential from one point to another without moving charges from the source), which is completely permitted because ultimately, the energy all comes from and returns to the same place, the active vacuum. So the more kicks, the more potential that can be transferred to our collector coil.

I have more to say but theorizing won?t get the testing done any faster. My present hypothesis is if having the collector coil inside the pulse coil makes any measurable difference in the spikes or circuit output, it will be because of the radiant events occurring from the coil. But again, this all needs to be tested rigorously and verified.

@Otto, I recommend that you bring your pulse width way down from 50%. You can get better radiant results that way and use much less current from your power supply. Just a thought.

God Bless,
Jason O

Hi Icarus,

So you are saying that when the collector coil is inside the control coil, you get larger spikes? Do you have a scope that you could take picture of and post here? Did your bulb appear to have any difference in the glow when the collector was inside the coil as opposed to not.

One more recommendation. If you can get the pulse width down, you may get better effects with less current dissipation through the coil.

God Bless,
Jason O

Hi Rosphere,

Absolutely correct! Once you get the pulse width right, the changing the frequency only gives you more pulses to work with. But when you get close to the coil's resonant frequency, the kicks will start to add into a humongous sine wave when the coil is at resonance. Unfortunately, I have not had the chance to dabble in teh coils actual resonant frequency since most of my coils' resonant frequencies were up in the MHz above my signal generator's range.

The tall kicks are a BIG key! High voltage low current.

God Bless,
Jason O

OTTO,

Hate to ask these questions, but nit-picking engineer's need this level of detail.

How is the "50 turn" coil wound?  Which direction in reference to the wire that goes through it?

Also, is this 50-turn coil just a lump of 50 turns or does is have a length - like a solenoid coil.

If it is like a solenoid coil - single layer or more than one layer?

Inner and outer dimensions of the 50-turn coil?

(Might be easier to post a picture of it or make a sketch than to describe it.)

For duplication of an effect - you need to get as close as possible to the original experiment.  If you ever invent anything, this sort of detail in a lab notebook will go far to prove that you invented it.  This is also good for general experimenting.  Things appear one way today and then test tomorrow change your view and you can go back and compare the differences in setups.  Scientist would disect you setup down to the wire length, insulation type, copper alloy, and everything else.