Lenz, E. (1834), "Ueber die Bestimmung der Richtung der durch elektodynamische Vertheilung erregten galvanischen Ströme", Annalen der Physik und Chemie, 107 (31), pp. 483–494.
Annalen der Physik und Chemie - Βιβλία Google
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Oh, almost forgot. I put a hole in the brass dead center .251 diameter using my "over" chucking reamer. I will make another brass 60 degree cone, it's hole will be with the "under" reamer, .249 diameter. I will press fit a .250 shaft on that, thread the far end so that it supports a mandrel and can expand it.
Winding voice coils up to 6 inches diameter is easy on the lathe, but it's a 7 by 16 machine so this baby 8 incher won't even fit. I made a morse 3 holding fixture, and my brass dead center is turned to .750 so I can hold it in my .750 ER collet on my MT3 adapter.
Jn
That said.. at national labs, exceptional people given high level roles is not trivial. And sometimes high level clearance is required for the job.
One can look at his telling us where he was and what was required of the position and think that he is telling us in order to lord over us, show he is above us.
My take...it's a job, one he did and is not ashamed to detail...but so what? I've no problem with his admirable accomplishments..
Jn
Winding voice coils up to 6 inches diameter is easy on the lathe, but it's a 7 by 16 machine so this baby 8 incher won't even fit. I made a morse 3 holding fixture, and my brass dead center is turned to .750 so I can hold it in my .750 ER collet on my MT3 adapter.
Jn
I really had to laugh at that, I understand where you are coming from, and your post was funny..
That said.. at national labs, exceptional people given high level roles is not trivial. And sometimes high level clearance is required for the job.
One can look at his telling us where he was and what was required of the position and think that he is telling us in order to lord over us, show he is above us.
My take...it's a job, one he did and is not ashamed to detail...but so what? I've no problem with his admirable accomplishments..
Jn
I have known that is the purpose of the shorting ring for a very long time.
It is the explanation I am referring to. Did not make sense about how it lowered L
ETM was clear in his description... though wrong or right.
Try again because if not clear to me, maybe not clear to others.
Thx-RNMarsh
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Perhaps.
I look forward to your explanation of how Lenz exclusion doesn't exist.
This E/M stuff is kinda textbook stuff. I am not sure how to respond to posts that are entirely inconsistent with E/M understandings from the last century.
Jn
Yes, he was clear.
Accurate, certainly not.
Jn
Not any different than JC telling where he was and what he was doing there while talking about a design/circuit.
I know how there are unintended spin-off R&D apps which could have military use.. maybe. so, they are classified. But actual nuclear "device' themselves? few ever see the making of it and how it is constructed and detonated and spent time in the desert for a year on a real LIVE nuclear weapon detonation and help put together the control, timing and data gathering from it. watching the "device" from a Control Bunker miles away send signal by uwave remote control and watching via remote camera ground zero and feeling the Device go off. Its an experience few get to participate in first hand. Certainly not the usual EE type of circuit design job.
But, thats a story for another time. No Not bragging. Just sayin'.... that kind of science - high energy physics - can give different interpretations of whats really going on.
I dont feel i am above anyone here... This sh*t is just a hobby thing for me... A side show and issues in my life.
Anyway, the explanation was not clean and clear on how the shorting ring lowers inductance. But, I am more concerned about the non-linearity of the Z and how to eliminate or reduce that to produce lower distortion from the driver. The simple current-mode operation/experiment I tried was to reduce distortion. Which it does. But, it would be nice to reduce it at the source... the driver, also.
Thx-RNMarsh
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Not being able to tell is one thing. Hiding is another. Your Q level is simply a matter of course, job stuff.
Ignorance of actual E/M, not exactly. ETM seems predisposed to things that support his website.
Alas, my pm's with him seemed consistent. Perhaps I was too quick..
Jn
I have not seen his web site... I am just talking in general...
One is not clear and one is clear... but I can always look it up in books to my own satisfaction etc.
So, it isnt a life and death matter to understand. However, where is the non-linear part of the driver Z coming from?
Lets work to lower THAT, directly.
From #28613, above:
Anyway, the explanation was not clean and clear on how the shorting ring lowers inductance. But, I am more concerned about the non-linearity of the Z and how to eliminate or reduce that to produce lower distortion from the driver. The simple current-mode operation/experiment I tried was to reduce distortion. Which it does. But, it would be nice to reduce it at the source... the driver, also.
I am expecting great results from you JN in this regard.
🙂
-RNM
One is not clear and one is clear... but I can always look it up in books to my own satisfaction etc.
So, it isnt a life and death matter to understand. However, where is the non-linear part of the driver Z coming from?
Lets work to lower THAT, directly.
From #28613, above:
Anyway, the explanation was not clean and clear on how the shorting ring lowers inductance. But, I am more concerned about the non-linearity of the Z and how to eliminate or reduce that to produce lower distortion from the driver. The simple current-mode operation/experiment I tried was to reduce distortion. Which it does. But, it would be nice to reduce it at the source... the driver, also.
I am expecting great results from you JN in this regard.
🙂
-RNM
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It is never life or death.
That said, misunderstanding of how transformers work, Lenz and faraday...if one wishes to have a website with whatever one desires as understanding..regardless of the accuracy..That is beyond my control.
Jn
That said, misunderstanding of how transformers work, Lenz and faraday...if one wishes to have a website with whatever one desires as understanding..regardless of the accuracy..That is beyond my control.
Jn
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Like I said. I have never read his web site. So I am making no judgements. I care about lowering the driver non-linearity of its Z and any other ways distortion manifests itself.
Do you have any ideas on how to do that. I am afraid we are going off at a tangent to this distortion subject. I hope not.
-RNM
Do you have any ideas on how to do that. I am afraid we are going off at a tangent to this distortion subject. I hope not.
-RNM
Richard, they (coil winder and 8) would rather put us down, that move forward in a useful way. Your experience with LLL is unique, and your overall experience shows this being most useful for audio design. Can't say the same for our critics.
Well yes and no. There are some jobs which are learned only from the inside when dealing with nuclear devices (weapons)..
LLNL has NEVER EVER hired for my type work from the outside. It is too specialized and the knowledge is not (better not be) available to the public.
Thats why I had a Q clearance. And, i spent 25 years learning it.
Lets move on and lower driver Z non-linearity.
-RNM
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Yep, as much as for Jack Bybee. Top secret military research leading to quantum leaps in audio development.
One thing that varies the Z is the voice coil being in different locations in the gap. An overhung VC would especially vary due to significant amounts of the coil moving in and out of the gap.
So one solution would be to stop voice coil movement. This would indeed keep the Z constant (ignoring other variations like the magnetic nonlinearity of iron), but it defeats our "other" purpose of a driver, making the air move.
One solution I've seen is an air transformer: a horn. This trades off a large movement with a smaller movement (and a larger force needed), as the horn throat is "stiffer" than free air in the horn's frequency range.
So now we get arguments from those who don't like the sound (or look) of horns.
The more I've learned, the more it seems audio design (and much of life) is like this. It's engineering (and other) tradeoffs all the way down! You can fix something by doing something else, but then the something else has its own problems. The best you can hope for is to optimize between various tradeoffs. Horn woofers are more efficient (which is only an advantage if you want to use a Class A amp), but they have one of the lowest WAF factors of any speaker design.
yes, the non-linearity of iron. probably the source of much distortion in the speaker's Z. Reminds me of those iron core inductors used in cheap cross-overs.
Are ferrite magnetics better or worse than iron for the center pole piece?
There are bobbin cores which are a ceramic like material (white also) which are used to make inductors (German?) which had huge power capacity without saturating and extreanly low distortion.
lets make an entire speaker driver machined or molded from that material.
Just brain storming here with you all.
-RNM
Is this really necessary? What is your major malfunction and claim to fame such that your opinions like this useful here or anywhere?
Contribute to the subject,pls.
-RNM
Shooting from the hip here, but it seems to me ETM is referring to the H field in a current drive regime whereas Jneutron is referring to the B field in a voltage drive regime.
Oh, like this fan with variable pitch blades - it still uses a voice coil and magnet structure, but those may not be the most nonlinear parts of it:
Eminent Technology: home
Here's a DIY version:
Rotary Subwoofer Combines A Speaker Coil W/ A Fan | Hackaday
I am going thru my file cabinet and throwing out old notes and letters and circuits when i came across this from long ago.
View attachment v-I FB ckt.pdf
Volt and Current fb
THx-RNMarsh
Is that true?
Could it be?
-RNM
View attachment v-I FB ckt.pdf
Volt and Current fb
THx-RNMarsh
Oooooh
Is that true?
Could it be?
-RNM
And, that smaller movement minimizes the time modulation of all other signal on that radiating diaphragm.
All good fortune,
Chris
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