Why is Joe wasting so much time/effort reinventing the wheel.
Zobel network calculator - Impedance equalization circuit - Step by step
Zobel network calculator - Impedance equalization circuit - Step by step
One of my interns had 256 gigabyte usb stick, it looked like a usb connector with a blob of epoxy on the tip. Whoa, this tech stuff is going crazy..
I told him, don't bring it to the beach or near any sand. I suspect cells will be corrupted by the thorium at the beach. With such small cells, I would think it would be far easier to have single event upset failures.
jn
The original ILC beam dump was a 4 kilometer long water tube, with a 600 gallon per second water pump to replace the vaporized water..
Here, the beam dump kickers would occasionally misfire, they believe the semi switches sometimes are triggered by cosmic rays. The difficulty is when four are needed to get the proper beam bend, and only one triggers.. We lost a few hundred K$'s worth of electronics on one misfire..
The real scary machine is the neutron source being built in Lund, Sweden. When they asked me about wiring, I looked over the target...a really really large (many tons) cylinder of tungsten or moly spinning very fast to spread heat.
jn
I agree completely. Every decent undergrad EE program in the US teaches Bode. I was taught it 13 years ago and it was even required of Comp E. Whether the graduates absorbed any of it or not is a different question.
While I do agree in principle, I was quite dismayed that a reference to a Bode plot and phase margin was met with a "deer in the headlight" gaze. Which means one of two things, never taught, or never absorbed. The Phd physicist I'm working with, 45 give or take, had never heard of it..and he is one of the most brilliant guys I know here. He googled it, and took about two minutes to understand it, but was never exposed to the concept.
My bigger question is, is it part of the EE core, or is it an elective? If elective, then many could get through without exposure.
For me, I'm sure it was core..even though I cannot remember...too far back..
jn
About 15 years ago I was working at a US aerospace company as a technician.They hired
a new employee, a EE with a masters degree in electrical engineering. One day I showed
him a schematic of a current mirror, he said that he could not understand this as a transistor was a switch.
Another time I explained to him about hysteresis and suggested a 330k to the positive
input to the op-amp. He said " Thats a good idea, lets make in 10K".
Another time he came up to me and asked that if you have 2 power supplies in series do you add
the currents from each power supply? I said no, that they should both show the same current. He said that the power supplies had a different current reading, I said that he should put a meter in
series with the power supplies and send the one that disagrees back to calibration.
Yes with a masters in EE!
a new employee, a EE with a masters degree in electrical engineering. One day I showed
him a schematic of a current mirror, he said that he could not understand this as a transistor was a switch.
Another time I explained to him about hysteresis and suggested a 330k to the positive
input to the op-amp. He said " Thats a good idea, lets make in 10K".
Another time he came up to me and asked that if you have 2 power supplies in series do you add
the currents from each power supply? I said no, that they should both show the same current. He said that the power supplies had a different current reading, I said that he should put a meter in
series with the power supplies and send the one that disagrees back to calibration.
Yes with a masters in EE!
OOPS, just checking out the curricula of "my" Uni: they don't even have an EE department any more, only Computer Science remains. 🙁
3) Never needed.
It's mandatory at undergraduate level, AFAIK, at any decent university I've seen.
Overlapping Venn diagram..
Just checked the uni close to me. No mention at all on Bode, negative feedback, or even PID.
Could be it's in there somewhere, I just couldn't find it. And one of the interns goes there.
jn
I have to admit there's a lot of BS in the course titles at MIT these days. Machine learning, blah, blah, AI blah, blah, now that Minsky has been implicated in the Epstein debacle things might get very interesting (but then again probably not).
They booted it out of the required courses list and put it on the EE elective list (must take 6 EE electives from the list of ~12 to get the BSEE) at my undergrad school. I think this was probably to make room for their Design Project course which is required. They rank it as a senior-undergrad "400 level" course:
_
_
Attachments
I am warning everybody...
This is looking more and more like Asimov's "Profession".
More and more, the new ones are using blocks of code and diagrams to build objects, with less and less knowledge of what's under the hood.
jn
This is looking more and more like Asimov's "Profession".
More and more, the new ones are using blocks of code and diagrams to build objects, with less and less knowledge of what's under the hood.
jn
I can't get into all this infighting, but I am reminded of a fundamental historical case where global negative feedback was first used in making practical electrical power amps.
It didn't come with the first power amps, they had made many for at least 20 years, before Black (the man), working for the telephone company went on a quest to make an even more effective (lower distortion) power amp, in order to facilitate better long distance phone calls. He is known to have come up with the basic idea, while on a ferry, and he hastily wrote it down on whatever paper he had around.
He worked for the telephone company, but he was not directly told to work on negative feedback, and he got permission to do so, but only on his own time, after hours of his usual work, (sound familiar anybody?), and the company would quietly lend some of their resources. He developed the first relatively high global negative feedback amplifiers, and they were quietly added into the system. He kept his ideas SECRET from Bode and Nyquist, because he knew they would either take credit for his ideas, or trash them prematurely. They were allowed access, AFTER his amps were proven to work and shown to improve over existing designs. Why? For the same reason that Joe cannot make his case here, because of all the 'experts' telling him how 'backward' he is, how what he says can have no merit, (because they either don't understand it or have never bothered to try it), and these 'experts' are tying to discourage Joe from further contributing here on the subject.
In my opinion, his input is just about the only new thing that has been discussed here for some time. But we must remember the rules:
1. It can't exist.
2. It exists, but it is not important
3. We invented it.
That's all there is to it folks! '-)
It didn't come with the first power amps, they had made many for at least 20 years, before Black (the man), working for the telephone company went on a quest to make an even more effective (lower distortion) power amp, in order to facilitate better long distance phone calls. He is known to have come up with the basic idea, while on a ferry, and he hastily wrote it down on whatever paper he had around.
He worked for the telephone company, but he was not directly told to work on negative feedback, and he got permission to do so, but only on his own time, after hours of his usual work, (sound familiar anybody?), and the company would quietly lend some of their resources. He developed the first relatively high global negative feedback amplifiers, and they were quietly added into the system. He kept his ideas SECRET from Bode and Nyquist, because he knew they would either take credit for his ideas, or trash them prematurely. They were allowed access, AFTER his amps were proven to work and shown to improve over existing designs. Why? For the same reason that Joe cannot make his case here, because of all the 'experts' telling him how 'backward' he is, how what he says can have no merit, (because they either don't understand it or have never bothered to try it), and these 'experts' are tying to discourage Joe from further contributing here on the subject.
In my opinion, his input is just about the only new thing that has been discussed here for some time. But we must remember the rules:
1. It can't exist.
2. It exists, but it is not important
3. We invented it.
That's all there is to it folks! '-)
It's all a conspiracy John.
We are all here to prevent advancement. You're on to us..
jn
ps...you said ""He is known to have come up with the basic idea, while on a ferry,""
Didn't Paul Voigt patent a negative feedback amplifier in January 1924? If so, seems Black may have "stolen" (or worked upon) the basic idea of Voigt.
We are all here to prevent advancement. You're on to us..
jn
ps...you said ""He is known to have come up with the basic idea, while on a ferry,""
Didn't Paul Voigt patent a negative feedback amplifier in January 1924? If so, seems Black may have "stolen" (or worked upon) the basic idea of Voigt.
Last edited:
It's going to fall under a signals and systems type class. The likelihood is probably pretty low of students fully grasping PM and realizing how to go from Laplace transform space abstractions to real systems. So I do wonder if they're learning it but not retaining and/or knowing the verbiage.
I probably was a little too harsh on the term "throwing under the bus" but I'm at a loss for a milder term in the same vein.
I probably was a little too harsh on the term "throwing under the bus" but I'm at a loss for a milder term in the same vein.
My school also stopped requiring the course in "steam tables" (thermodynamics for Mech.E's) to get a BSEE. Thank Buddha.
- Status
- Not open for further replies.