Hi Joe,
No. That is your posting style when you want to make a point. Whether that point is technically correct or not is another matter.
So, if you can't / won't allow your source to become a member and post here, you can't use his "testimony".
Very early on before Allen died, you described yourself as his technician. You didn't have a lot of test equipment, but you did have a number of soldering stations. This fits in with how you described yourself. Now your description concerning what you did with Allen has changed a bit.
-Chris
No. That is your posting style when you want to make a point. Whether that point is technically correct or not is another matter.
I'm sorry Joe, but if you are going to rely on what someone else says, you need to identify them, or drop that line of posting. Everything you have said about your "EE" is unsubstantiated. What is clear is that you have not had any formal training in these subjects. You need to learn, and that can only be done by paying your dues (like the rest of us) and going to school. Let us know when you are finished or expelled - either way.
Most of the people here do not see it this way. Only those who have their own universe find things difficult here on occasion. Maybe you're actually afraid that he might fit in here!
So, if you can't / won't allow your source to become a member and post here, you can't use his "testimony".
Very early on before Allen died, you described yourself as his technician. You didn't have a lot of test equipment, but you did have a number of soldering stations. This fits in with how you described yourself. Now your description concerning what you did with Allen has changed a bit.
-Chris
Education is a difficult topic, even for Switzerland where it's basically free for all. The thing is, if it looks too hard, like EE, nobody will sign up for it, and the federal government, who pays for the department, has the right to close it down and the professors will end up on welfare.
With that being said, feedback theory is still being taught here, but then again, I don't recall any exam or thesis on this topic. So you can call it "unenforced mandatory topic" and sleep through it.
I did not write the recruitment ads, and actually have never seen them. I am only called in to meet the candidates, and to ascertain (sorry, just watched My Cousin Vinny..
) the ability of the candidate to do the job. My area of expertise is a rather odd mix of disciplines, so they want me as part of the interview process.While I agree with you that the knowledge is out there, I fear that it is not part of core courses anymore but within electives. It is quite a shock to find it lacking, especially for EE's.
I just worked with some interns (this being my first time), very smart guys.. one a junior, one a senior, and neither had been exposed to Bode. I am engaging the intern program manager (on site) now, trying to get some type of feedback system in place so that all the mentors here can detail to the profs at the various universities where the intern's lack key skills or understandings that are needed within industry, and also here.
For the most part, I believe it to be simple tweaking of curricula, so should be fairly easy. Sometimes, it's just exposure to the concepts that is important. Once exposed and familiar (not necessarily expert in) the concepts, they will be able to recognize it out in the wild, and adapt.
One of my strengths is not expertise in specific domains (unless doing stupid things is considered a talent..
), but the ability to recognize unexpected things, and to not be worried about asking others who are far smarter than me how to solve it..jn
What I have written I have written (emphasizings are Joe's) and stand firmly by it. It is nothing but basic analog feedback system theory. How on earth can that be so insurmountable for anyone posing as an expert here? Though there is no hard-wired loop, the physical relations in the voice coil make the effect (as KSTR already elaborated, thanks).
Though the feedbacked EMF is usually overlooked outside the resonance region, by no means can the effective loop and the degeneration of current by it be refuted.
The same feedback mechanism also occurs with the inductance EMF, which is more important as a source nonlinear distortion.
This is not support for Joe's narrative though.
I did not write the recruitment ads, and actually have never seen them. I am only called in to meet the candidates, and to ascertain (sorry, just watched My Cousin Vinny..
While I agree with you that the knowledge is out there, I fear that it is not part of core courses anymore but within electives. It is quite a shock to find it lacking, especially for EE's.
I just worked with some interns (this being my first time), very smart guys.. one a junior, one a senior, and neither had been exposed to Bode. I am engaging the intern program manager (on site) now, trying to get some type of feedback system in place so that all the mentors here can detail to the profs at the various universities where the intern's lack key skills or understandings that are needed within industry, and also here.
For the most part, I believe it to be simple tweaking of curricula, so should be fairly easy. Sometimes, it's just exposure to the concepts that is important. Once exposed and familiar (not necessarily expert in) the concepts, they will be able to recognize it out in the wild, and adapt.
One of my strengths is not expertise in specific domains (unless doing stupid things is considered a talent..
jn
Suggestion (serious) you need to write the job spec - its typically what they do in industry if they are hiring a replacement who is leaving amicably - with a few tweaks from the guys boss.
Alleged agreement from an unknown person with unknown background does not carry much weight here. You should stop this no-name dropping as it just makes you look silly. Why not employ clear technical arguments stated using normal technical English? Then we might make some progress.Joe Rasmussen said:
You don't know how "qualified" we are. There are certainly EE PhD and physics PhD on here; some may have both. Anyway, truth does not depend on who says it or who allegedly agrees with it; truth must stand on its own two feet.
JN -- while I'm a few years (5 now?) from teaching junior-level signals and systems classes, we VERY much taught Bode plots in them. On paper, no computer. Retention is a wildly different question.
We have to remember that EE (and I'd argue ME and ChemE as well, probably Civil too) are extremely wide breadth fields. In a lot of schools, EE is its own department, whereas most any other department would fragment an EE degree into multiple, e.g. the various molecular/cell -level biology fields vs large organism vs ecosystem-level, where they share a lot of core classes but acknowledge the broad differences in specialty.
High power is a total niche. Only a small subset of my classmates went into power/controls, and no one I know from my Ph.D cohort did (I was at the wrong uni for the latter, though). So I'd be more careful with the bus throwing. I'd almost wonder if you're not going to have greater success looking for ME's with expertise in controls than an EE.
To your point, my dad, a ChemE, has far more expertise in RF than I do, given he worked on RF welding of plastics whereas I have 2 jr/sr level classes from a decade ago. On the opposite side, my knowledge of semiconductor fab chemistry greatly outpaces his, much less the biology side I picked up along the way. I'm not yet at the point of hiring people, but train-ability looks a more important characteristic for us in highly multidisciplinary fields than "getting the right skillset" out of the box.
We have to remember that EE (and I'd argue ME and ChemE as well, probably Civil too) are extremely wide breadth fields. In a lot of schools, EE is its own department, whereas most any other department would fragment an EE degree into multiple, e.g. the various molecular/cell -level biology fields vs large organism vs ecosystem-level, where they share a lot of core classes but acknowledge the broad differences in specialty.
High power is a total niche. Only a small subset of my classmates went into power/controls, and no one I know from my Ph.D cohort did (I was at the wrong uni for the latter, though). So I'd be more careful with the bus throwing. I'd almost wonder if you're not going to have greater success looking for ME's with expertise in controls than an EE.
To your point, my dad, a ChemE, has far more expertise in RF than I do, given he worked on RF welding of plastics whereas I have 2 jr/sr level classes from a decade ago. On the opposite side, my knowledge of semiconductor fab chemistry greatly outpaces his, much less the biology side I picked up along the way. I'm not yet at the point of hiring people, but train-ability looks a more important characteristic for us in highly multidisciplinary fields than "getting the right skillset" out of the box.
Whilst I didn't do high power on my undergrad course one of the lecturers was active in that field and did thermal modelling and imaging of those big hockey-puck thyristors they stack up for turning 10E6VDC into AC. He used to enjoy explaining what happened when it went wrong, which was enough for me to decide that field was not for me.
When leakage currents start to get into the hundreds of amps I can no longer get my feeble brain around the problem.
When leakage currents start to get into the hundreds of amps I can no longer get my feeble brain around the problem.
(Dave) Peach Audio Pre's have had M-S forever. Really nice Pre.
Great tube designer.
T
As Dan, Richard Marsh and Pavel mentioned before, your solution benefits some amplifier and helps RFI immunity, perhaps it does sound better.
Your explanation simply makes no sense to me and others, the logic does not hold and some terms are confusing. Please consult people with EE background that you trust in wording your explanation.
More of the stuff I can not understand will not help me and many others. We are aware of the F = BLI, but the I here is the current passing through each speaker driver which has no relevance to a current drive with your proposed solution. And we are also aware that Force is not equal to Acoustic output. Perhaps it is simply better show the measurement of acoustic distortion of your solution to make your point.
Do I qualify? (63kA/120ms squirrel cage shunt, BW=5MHz)I am currently involved in interviews to hire several EE's and ME's, including my replacement. It is very clear where the teaching over the last 15 years or so have fallen flat with respect to analog. (and don't even get me started on high power electronics, the best candidate so far believes 200 amp 480 volt systems are high power..
Attachments
The actual difficulty is it requires experience in motion control, electronics, mechanical, soldering, epoxy, ultrasonic welding, superconductors, and magfield analysis/understanding and testing. It is neither EE nor ME, but a rather unholy combination of multiple disciplines. At this time, upper management is hoping for an overlap of at least 3 years, better 10. (edit: I'm just hoping to be alive that long...)
As per above, it's multidiscipline. Either one "jack of all trades", or multiple people doing half time. I've worked with someone with a masters in mechatronics, the holes in knowledge were quite significant.
As to throwing a bus, I have presented only what I am seeing in the candidates and interns. But I agree with all who have posted, it is a very big world, and those who do know Bode may indeed be culled out by a well meaning HR group..trying to meet the job posting as written.
The book I cited in fact does do a reasonable display of Bode plots, gain and phase margin, but you have to go 174 pages into the book, roughly halfway. Clearly written as a digital control system tome, so the emphasis is not on true analog.
You have hit the nail precisely on the head, well done. Trainability is by far the key..
jn
Last edited:
Get over it Joe, there are several folks here far more qualified by looking at what was said.
The metric is actually how many buildings can be destroyed by a single event...
That gives the SEU (single event upset) a completely new meaning.
But is it the width or depth of the smoking crater?
Edit: LS2 Report: New SPS beam dump takes shape | CERN
most of us wouldn't even thing of what to do with the beam when you've finished with it! Answer, shoot it at something BIIIIG
Edit: LS2 Report: New SPS beam dump takes shape | CERN
most of us wouldn't even thing of what to do with the beam when you've finished with it! Answer, shoot it at something BIIIIG
Last edited:
I noticed your signature. Joe didn't answer again, he shows a speaker and crossover connected directly to a voltage amplifier (he even allows it to be "ideal" now) with shunt networks to make the net load on the amplifier a pure resistance. So I've asked many times how does this relate in any way to the benefits of current mode driving of speakers or modify the current in the speaker in any way?
Let me ask you a polite question, Scott. What do you expect from that endless conversation with Joe? Do you expect for him to see the light as Tommy did?
- Status
- Not open for further replies.