It looks like this:
Well thanx Verpies, I don't understand what I'm looking at in those pictures though....
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Although, your homemade coax should do the trick there.? I wonder how exactly the electron flow looks in a good cylinder ( like as it's self inducting, it's going to cause more helical paths...)? and although the propagation is actually in a skin effect (so the outside skin is best right?)
Hi d3x0r,
from this link (scroll to lower part) you can see how the skin effect is working in a coax structure.
The inner conductor is more and more used to its outside, while the outer conductor (shield) is more and more used to its inside
http://www.iue.tuwien.ac.at/phd/nentchev/node48.html
See also this link for how current and the magnetic field (almost noting coming out) is flowing at low frequency:
http://www.iue.tuwien.ac.at/phd/nentchev/node46.html
Regards Itsu
1) 18AWG ....
I would like to understand why this differences between apparently same type of diodes. (I don't expect any answer but if someone has any ...). My 1n5408 provides 10-12ns very easy. 1n5406 does nothing. I'm sure verpies after this (his) test will not recommand 1n5408 as a good DSR diode.
?
When the pulse ....
Basically I was seeing the things in the same way, but my disscusion partners fail to understand the (very important) impendance mismatch.
?
Thank you for both your answers.
?
Mihai
Hi d3x0r,Okay, I'd believe those, but those are representations of a current flowing through the center conductor only, not through the shield (which normally is grounded)....from this link (scroll to lower part) you can see how the skin effect is working in a coax structure.
The inner conductor is more and more used to its outside, while the outer conductor (shield) is more and more used to its inside
http://www.iue.tuwien.ac.at/phd/nentchev/node48.htmlSee also this link for how current and the magnetic field (almost noting coming out) is flowing at low frequency:
http://www.iue.tuwien.ac.at/phd/nentchev/node46.htmlRegards Itsu
Okay, I'd believe those, but those are representations of a current flowing through the center conductor only....
Hmmm, i think it shows the current and magnetic flux in both the inner AND outer (shield) conductor.
Anyway, i tried severall coax cables as L3 coil, but all 3 behave similar when pulsed with 1.5Kv nano-pulses.
http://www.youtube.com/watch?v=5ah6nXOEcR8&feature=youtu.be
Regards Itsu
I would like to understand why this differences between apparently same type of diodes. (I don't expect any answer but if someone has any ...). My 1n5408 provides 10-12ns very easy. 1n5406 does nothing. I'm sure verpies after this (his) test will not recommend 1n5408 as a good DSR diode.Not necessarily. All 1N5408 diodes are not equal because they were manufactured differently. They have the same specs for normal rectifying diode operation, but they differ wildly for DSR operation, depending on the manufacturer and the date when they were made.
Sloppy manufacturing techniques of the old diodes resulted in blurry PN junctions, and such diffused junctions are necessary for the DSR Effect to manifest well.? It was an accident that they were made this way.
Contemporary diodes have sharp PN junctions due to good manufacturing techniques, thus they do not exhibit much DSR effect.
No manufacturer today tries to make blurry PN junctions on purpose, because such diffuse junctions degrade the diode's performance as a rectifier (something we don't care about for nanopluse generation).
More here.
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Well thanx Verpies, I don't understand what I'm looking at in those pictures though....You are looking at the magnetic and electric fields inside a coax or a waveguide, pulsed at high CW frequency
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Thank you once again verpies. Your an enciclopedia. It's good to have you around. DSR is an exotic phenomenon. Diodes used for this were never intended to work in this manner.
?
Mihai
DSR is an exotic phenomenon. Diodes used for this were never intended to work in this manner.Exactly.
Also, a semiconductor manufacturer, that notices this gap in the market, could make a lot of money with minimum investment, by slightly altering their manufacturing process in order to produce diodes especially tailored for the DSR effect.?
The only reason that this hasn't happened, is because this opportunity has not been recognized by fabs' execs yet.
Was working on picking this back up.
I have an alternative circuit for shaping the 150V pulse....? I'm looking for comments/criticisms
The Schematic? (updated, no P Channel)
(Editable link)
the fixed 10ohm resistor should be larger, and paired with a potentiometer to provide width scaling.
can do it with either 2N mosfets to drive the other.? ?
replacement high voltage driver? ... I found this part which has really low on/rise times of 8.4ns/8.0ns respectively, and 18.0ns fall, 4.0 off time.
Instead of MOSFETs I could use bjt's.? I plan to use the a TL494 as the frequency generator, which I can get as low as 200ns pulses.? With the above scheme, it should go on, and latch off, and when the signal drops remain off until the next leading edge, and could even tolerate longer pulses
(The attached image has been updated, it's the link above really; is there a way to embed an external link as an image?)
? Last Edit: February 16, 2013, 04:18:12 AM by d3x0r ?
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Well failing to get any useful feedback from anyone I went ahead and implemented the circuit.? I got it to simulate at that circuit lab link, adjusted it a little... added some capacitance and resistors to minimize impact on the power supply in overdrive conditions....
and It works great in all the simulations (sorta, LT-spice has a current overflow) but adjusting the rc time delay between the gates causes a good drive... but in reality it fails.
The voltage peeks out at like 1.1V.? I thought I understood these; the gate is a capacitor of sorts, that gets charged to voltage X and enabled conduction; and the conduction from the base is measured in nA so it should be neglegable.? So if I have a capacitor resivoir, it should fill the gate caps, and stop flowing?? Which means that without explicitly pulling to ground the gate, it will float in a semi-conductive state... so basically in the drive side I would think I should see voltages up to 12V.? but I don't and I don't understand.? I so hate hardware; sorta why I stuck with software.
one person threw out what appear to be flippant answers of 'you just can't do that, and anyone should just know' but that 'you need an inverter on one of the gates' ... I'm not sure why or where.
it's just like a vaccuum tube? no?? Put a high potential, and inject another potential from the side to gate current?? Only this shouldn't consume the current from the field?? Or do mosfets really behave the same way, and the stored charge in the gate is consumed in the transfer?
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