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Already covered while I was typing.

Quote from: bob.rennips on June 18, 2007, 01:21:31 PM

Having duplicated Otto&Jason's driver/mosfet combination I've now got a much better setup. The main difference other that using a low side driver and not the high side driver, is the addition of two decoupling capacitors directly across the power inputs to the driver. This removed much of the rubbish and I was getting much crisper square waves when entering high khz 500K+.

I've also noticed that when applying a larger 24V across the coil to generate the static magnetic field, that the ability of one coil to induce into another coil is cut in half, REGARDLESS of the direction of current applied to generate the static magnetic field. In other words it doesn't matter whether N is top of the coil or bottom of the coil, they both have the effect of reducing the coupling between the two inducing bifilar coils.

I expected this to happen in one direction, but thought that in the other direction there would be an enhancement.

Bob,

If you are using a ferromagnetic core, perhaps it was being saturated with the static field applied, and not without it. This would explain the reduced coupling.

Darren

Air core only.

This setup by brnbrade is amost exact to my tesla coil video I showed.

You have a secondary and you have a few turns for the primary.

The only big difference with my setup was that I used a small blocking oscillator to create a train of spikes  (which contain a number of frequencies in their Fourier decomposition) and can exicte a number of resonances that may exist.

The other small difference was that I used a ferite inserted in the center of the tube.  He seems to be inserting a magnet.  And also he is placing a disk magnet. 

My ferite on the outside of the tube did nothing.  But it looks like a magnet disk will do something.

Now, I'm wondering about his claim of 250 Volts and 1 Amp.   I saw spikes on my scope that were realy high as well, but I doubt the 1 AMP constant flow.   You just can't hook up a regular ampmeter to some RF source and have any relyable reading.

EM

Quote from: bob.rennips on June 24, 2007, 09:39:42 AM

Air core only.

Bob.

OK, I went back to your description of how you wound your coil, and I see now why you are getting this reduction.

It should not matter if your static field coil is N-S or S-N in regards to the diminished induction effect it is having with your "transformer". In fact, if you short the two leads of this static coil, it will again have this effect on the induction.

Reason? This static coil is acting as a load on your "transformer".

Might be best to use a permanent magnet for the static field.

Regards,
Darren

Thanks Darren for your explanation. I'd moved onto a permanent magnet setup last week and had some interesting results. I've had on one occasion, a suddenly appearing AC sinewave, on an output coil,  with a fixed amplitude, no decay or ramp up. It appears and disappears. There is no rhyme or reason. Almost impossible to capture on a camara - believe me I've tried!!

More on this in a little while.

So you input the frequency with a wire from the headphone jack, and not connect the ground?

This is odd. Surely, the output from the headphone jack is music, i.e. audio frequency
stuff between 40 hz and 18khz.
Paul.

Here's a run down of where I'm at with my experiments as setout when I started this thread.

I can tell you what DOESN'T work.

1. Solenoid air core electromagnet to create the static field - DOES NOT WORK. For reasons that have now been explained by ZPE. It paraphrase ZPE it reduces the size of the pulses because it in effect puts a load on the 'transformer'.

2. 5000Volts DC at a few milliamps to create a very weak static field - DOES NOT WORK.

3. Both of the above have been comboed with input pulses into single coils and bifilar coils - parallel, inversed, and alternatly pulsed up to 3MHz.

4. Wrapping coils around a solid cylindrical magnet is not EFFECTIVE. I wrapped one coil around as an input for the pulses, and another for the output. The coupling between the coils was poor. I obtained a very strange transient effect where an AC sinewave appeared on the output coil, just after the input pulse was turned off. The strange effect was their was no ramp up nor ramp down of the sine wave. It just appeared, with a fixed amplitude, for around 3/4 of the off pulse, and then dissappeared. The effect is very transient and I've been unable to capture on camara. Earl can confirm that I PM'd him earlier in the week concerning this result.

My permanent magnet core was made of three,   1 cm diameter, 1 cm long cylindrical neodym magnets. These magnets have seen some abuse so have chips around the edges. I believe the transient result is due to something happening in the limited empty space due to the chips in the center of the coil around the magnets.

If you consider a ring magnet with north-south as per Earl's posting, you have a magnetic flow IN the material of the magnet itself going UPWARDS - let's label this flow 'X'. But on the outside of the ring (flow 'Y') and within the center of the ring (flow 'Z'), both in AIR, you have a magnetic flow going DOWNWARDS.


The Over Unity effect, I believe, occurs when you have both of these flows. Consider SM's larger coil. Thin walled and vertical - designed to bring these two flows as close together as possible. These are then perturbed by pulsing coils or better still rotated by a rotating magnetic field.

Consider what happens if you apply a rotating magnetic field to these two flows (Y and Z). You get a dual magnetic vortex BUT WITH ONE IMPORTANT DIFFERENCE YOU HAVE TWO FLOWS MOVING AT TWO DIFFERENT LINEAR SPEEDS. The flow on the outside, flow Y, has a larger diameter than the inside flow, Z. Therefore their linear speeds will be different.

The FM is not what is causing the brnbrade effects. The Frequency Modulation has already been removed by the walkman by the time it gets to the headphone output as part and parcel of demodulating the signal.

What is more relevant is that the main high amplitude output will be in the range of 0-20,000khz, with harmonics I would guess into the 40,000khz.

It is the action of pulsing dual flows.

Frequency odd, yes.  But think three dimensionally.  Think Longitudinal wave sent at the same time opposing each other on a conductor in a magnetic field.  There is much more to it, but that is the short version.

NO. These are transverse electrical waves. There is nothing longitudinal about them in sense you are talking about. Pure voltage may be a longitudinal effect but once current flows we are talking transverse.

Longitudinal sound waves ONLY appears when you have something physically vibrating and then you are talking about air molecules vibrating longitudinally. That is why speakers/headphones have a diaphram that moves in and out to create the longitudinal waves.

SM's quote on breaking the sounds barrier was a metaphor and not meant to be taken literally. What he was saying is that the sound barrier was broken by making incremental increases in performance.

He was trying to suggest that rather than trying to build a TPU straight up with overunity you go for incremental improvements in input power to output power. That you start with getting the few kicks going, which will be under unity and slowly but surely get to the point where you have enough kicks to get overunity.

A point not lost on Otto in his run of incremental experiments.