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In 2009 when Peter and I worked on these experiments, the following is some background and suggestions based on the path I followed and results I achieved shortly afterward.
As the test setup consisted of two switches and two coils (in a bifilar configuration), and we found the "pulse" only occurred on the delayed coil, it was hypothesized that we may be able to eliminate one coil. That became the second test configuration, and basically where the collaborative experiments ended as far as I remember.
From here I began working to developing the simulated effect with some success. One key factor was that I surmised the connecting wiring between the coil and DC supply could/should be replaced with a transmission line, aka coax cable. This improved and solidified my results a great deal. In discussing the improvement with Wavewatcher/BEP, he suggested I replace even the coil with a length of coax, and this proved to be a fruitful modification. In fact, best performance was achieved when the two halves of TX line were of the same length. At this point it appeared to me to be a new and novel form of Blumlein/step-recovery-diode hybrid Pulser. The diode is very important, and the pulses are NOT produced without it. Some diodes work better than others, so I recommend trying a few types.
I found that the second, delayed MOSFET can also be dispensed with, as one MOSFET can do the job. It turned out that once the coax length, DC supply voltage and drive pulse period are "tuned" just right, a 50% duty input pulse will drive the circuit into a form of resonance where the pulses are 5 to 10 times the amplitude of the DC supply voltage, depending on the resulting output pulse width and gate drive period. In theory this circuit might achieve extremely high voltage/narrow pulses from ordinary supply voltages. One might consider this circuit a "tuned voltage compression device", where it converts a regular 50% pulsed DC input, to a proportional v x t pulsed output; the smaller that "t" is, the higher "v" is, so that the input and output v x t is always equal. At any rate, you can see one scope shot here showing the circuit hitting a "resonant" point where the output voltage is multiplied and time-diminished by about the same factor. The attached pics are using a 20V supply voltage.
- sim01 is the two MOSFET setup, with single red and violet gate pulses, and resulting delayed MOSFET drain pulse.
- sim03 is hitting "resonance" with continuous gate drive.
- 2-TX Line Schematic was my final configuration and starting point timing values.
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"Some scientists claim that hydrogen, because it is so plentiful, is the basic building block of the universe. I dispute that. I say there is more stupidity than hydrogen, and that is the basic building block of the universe." Frank Zappa
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Topic: Controller No5 With Protection - Looking for Explosions (Read 231515 times)
