Complete information on working SM style device.

[sparks]

@Chad

      I heard it!  There is another one sounds like vibrating wires at about a beat a second.  This is when he activates the baby tpu.  I've heard this vibration before and I think it is a subharmonic of 60cycle stuff.

[kames]

@spherics

I did test your simple example. There seems to be a voltage amplification. That appears with short pulses, around 3?10 mks. The amplification was around 20% in amplitude, ie, in voltage. I don?t want to jump into a conclusion, but there is something interesting about it. The amplification wasn?t proportional to the width of the pulse. Reducing the width of the pulse below 5mks didn?t seem to give any voltage amplification. The same was for pulses above 20 mks in width. I haven?t tested it under load. That is going to be a more complicated test. I can also confirm that inserting a ferrite core into the coil effectively kills the amplification, however, it didn?t kill it completely. I used frequencies from 2 khz and up to 100 khz. As an input for short high slew rate pulses I used BEMF pulses from another device. For a delay line I used a few turns of copper wire. There also seems to be a dependency of the amplification on the number of turns in the delay coil, but not much. In some cases, with reducing the delay the amplification was increased. I had to play with it but very little. The results appeared right away. I haven?t tried to use an iron wire as a delay line, I just don?t have it right now. I have tried to find any mistake in the set up or incorrect measuring and for now I couldn?t.

I am not saying in which point of the coil the amplification of the voltage occurs. I hope it was more than clear described by spherics.

I will see what is going to happen with my next tests. Very interesting, but I would wait for more testing.

Kames.

[eldarion]

I can also confirm a possible voltage amplification effect under no load resonant conditions.  I used an iron wire coil of around 10 turns for the delay coil.  First I established resonance of the bifilar coil without the iron wire; this was at 5.557MHz.  When I added the iron wire, the system detuned to a lower frequency of around 5.2MHz and the resulting peak-peak voltage was greater by around 20% (interesting how the two tests coincide).

I was driving the system with 10V p-p square waves through a 100K resistor, and the no-load p-p voltage was 11.4V.  When I switched the generator to sine wave, the coil p-p voltage dropped to around 8V.

In all cases the voltage scoped across the coil was a perfect sine wave.

I am not sure what to make of this...I am not seeing any sharply defined kicks, and this could just be simple resonant voltage rise occuring.  Shorting the 100K resistor destroyed any voltage rise as expected.

Any thoughts Spherics?

Eldarion

[MarkSnoswell]

@spherics

I have a few specific questions and observations.

1. Were you aware that if the coils are tuned very closely then pulsing just the A coil at frequency 3f will induce a natural 3 phase resonance in the x,y and z coils at frequency f?
If you were aware of this have/can you successfully drive the complete set of coils for an OU result in this manner?

2. Were you aware of the recent work on non radiating antennas? http://arxiv.org/PS_cache/physics/pdf/0510/0510154v1.pdf   Although the analysis has not been done it appears that your configuration may be another embodiment of a non radiating antenna -- which will act as an energy trap at the resonant frequency.

3. Have you tried any of the symmetric three loop(coil) tetrahedral topologies? If so have you tested both chiral forms and did you observe difference in the performance of left and right hand configurations?

4. Can you give any recommendations from experience of aspect ratio and number of turns for the exciter coils?

5. How do you define the tetrahedral volume -- are the exciter coils within this volume or radiating out from the volume?

6. You mention both harmonic of Fe NMR and natural resonance of coils (in reference to SM tuning of kick coils). For your tetrahedral design -- do you operate at "natural" resonance of the exciter coils or some other frequency?
As an aside here other researchers have reported the the exact frequency of this class of device is not critical but rather the natural resonance of the coils (not lumped resonance dictated by external capacitor). I am interested in your experiences.

7. Have you noticed the logarithmic dependency (increase) on applied voltage that others have observed?

8. Have you experimented with the harmonic make-up of the signal applied to the exciter coils? If so I am interested in what you have found to be efficacious in boosting the output.

9. Have you looked for spin (cold) current output? ... or have you always selected the output configurations to maximise normal bulk current?

10. What sort of drive circuits have you found most effective -- low impedance or high? Low or high side drive or both?

Sorry for the sudden slew of questions and comments. I have been quietly watching and comparing comments with other work. Please feel free to PM me if you wish.

...and no -- before anyone asks, I can not post more specifics in public at this time.

cheers

mark.

[aleks]

I can also confirm a possible voltage amplification effect under no load resonant conditions.  I used an iron wire coil of around 10 turns for the delay coil.  First I established resonance of the bifilar coil without the iron wire; this was at 5.557MHz.  When I added the iron wire, the system detuned to a lower frequency of around 5.2MHz and the resulting peak-peak voltage was greater by around 20% (interesting how the two tests coincide).

I was driving the system with 10V p-p square waves through a 100K resistor, and the no-load p-p voltage was 11.4V.  When I switched the generator to sine wave, the coil p-p voltage dropped to around 8V.

In all cases the voltage scoped across the coil was a perfect sine wave.

I am not sure what to make of this...I am not seeing any sharply defined kicks, and this could just be simple resonant voltage rise occuring.  Shorting the 100K resistor destroyed any voltage rise as expected.

Any thoughts Spherics?

Eldarion

Hope you guys know that ANY coil works as a low-pass filter and that the low-passed square wave tone appears to have a higher peak-to-peak voltage, and that depends on the cutoff point of the coil. The higher the cutoff point, the higher will be the raise. Of course, this raise does not have any OU characteristics, because the effective RMS will be lower than that of the original square wave.