There might be saturation, but not clear how that would produce a noise. More likely, it could be the wire moving relative to the ferrite, or magnetostriction of the ferrite itself. In either case, it is an inadvertent loudspeaker. That suggests a fair amount of current.
My apologies. I'm curious: why choose 10 cables?RNMarsh said:
I know that. You know that. Mr. Neutron, it seems, does not. He will almost certainly deny this, but his claim that you have to take account of impulses bouncing back and forth along an audio cable (rather than merely calculating the response for audio frequencies) is equivalent to saying that the impulse response and the audio response give different results. I seem to recall that you produced some graphs demonstrating that the impulse response converges to the audio response?scott wurcer said:
And R and G. At audio frequencies they affect characteristic impedance and speed of propagation. At RF frequencies (and, perhaps, pulses?) they affect attenuation. The two apparently different effects must give rise to the same result, when correctly taken account of. Of course, when speaking of pulses one must remember that a pulse has a wide spectrum so it may be incorrect to model a pulse using purely the RF transmission line model because part of the pulse's energy will be at low frequencies.
Exactly.
Despite jn's denials, this looks like the same argument we had before. I don't intend to re-run it.
Mine needs a kick as well. Oddly a miniDSP sans case is a pain to put in a box if you are too tight to buy the one they sell and you don't have a pillar drill...
Yes... Plumber's house syndrome... So much stuff never quite makes it to a nice neat case....
ITD does no longer function at those short wavelengths because ambiguities start to occur when the period of the sound is about twice the maximum possible ITD, i.e. when the period is about 1380uSec and the frequency is around 725 Hz, see Moore "introduction tot the psychology of hearing". Etc.
I already gave you three hints.
1. Modify the conductivity of the plate in the direction of the current, wire EDM
slots is one method.
2. Modify the dielectric environment such that dielectric charging currents fight the propagation.
3. Modify the return current path such that the lower impedance path is not the outer edges of the plate.
If it is a national lab project, have their people contact my people. The clearance people can intermediate if it is required, I'm not cleared.
John
You are not misinformed, the diff solid/strand is not much.
Sullivan of Dartmouth has some good write ups on the diff for amps apps.
A super is never naked. They are stabilized with copper or aluminum. For copper, they start with a tube of copper, rods of NbTi inside tube, then draw it down. Typically a foot diameter, drawn to .013 to .015 inch final. Aluminum, it can be melted over the super, it's only 600 plus C. The resistivity of the copper at 4.5K is what matters, this is defined by the RRR. An RRR of 100 means the copper will be 100 times more conductive than it's room temp value in LH2. Purity and annealing alter the RRR.
There have been efforts to coat the strands, or oxidize them, or tin them, but those methods are never very well controlled.
John
Again, your arguments are disingenuous, you dance around reality in audio.
As to your straw man, I am the one who has always stated equivalence between lumped and t-line.
As you state, it is better if you discontinue discussion as you continue to dance away from the science aspects.
As I said, look up state variable and control theory.
John
Yes.
It's a wild and crazy thing. I've been working on a plunge EDM to drill .003 inch holes into the end of a .015 inch balance staff for watch repair, but the last two years have involved life, so I've not done much on it.
John
I'm one up on you, John. Just got back an hour ago from the hosptal, where my spine rings Nos. 3 an 4 got their bore refurbished, which are supposed to be 11-13 mm caliber, but were only 7 mm and inhibited nerves controlling both my legs, which is what with side effects of my Diabetes II prevented me from walking in general, more of a sort of dragging along. The upshot is that I walk MUCH easier and with far less pain, so in a sense, I have been tuned back to normal. I'm not quite up to my Sprite specs yet, but with some physical therapy I am expected to make a more or less full recovery. Consequemtly, I will not be driving a mid sized Porsche yet. 😀 But I will be up and about once again. 😎
If proof is expected, anyone expecting it will have to dish out US$ 150 for an "after" magnetic resonance shot, to compare with the "before" shot.
You said period twice the maximum possible ITD, then period of 1.4 mSec...
We are not talking about the same thing. You are three orders of magnitude too slow with respect to actual measured, published, and verified human capabilities.
I suspect it is a definition of terms thing.
John
Impressed 0.075mm approx. hmm quite small.
Smallest milling bit I ever used was 0.5mm, machining one of the fancy engineering plastics (can't remember which one) got some grey hairs that day (machine was running about 60,000 rpm, very very very slow plunge and traverse rate lots of isopropanol based coolant).
Smallest PCB hole I have had to have mechanically drilled was 0.2mm.
Been looking at copper bus bar profiles to reduce skin effect and provide more surface area for cooling, some interesting stuff.
Smallest milling bit I ever used was 0.5mm, machining one of the fancy engineering plastics (can't remember which one) got some grey hairs that day (machine was running about 60,000 rpm, very very very slow plunge and traverse rate lots of isopropanol based coolant).
Smallest PCB hole I have had to have mechanically drilled was 0.2mm.
Been looking at copper bus bar profiles to reduce skin effect and provide more surface area for cooling, some interesting stuff.
Are we discussing human echolocation...
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Ultrasonic Helmet Lets Anyone ?See? Like A Bat | Popular Science
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