The minimum average correlation between equivalent sets of uncorrelated factors | SpringerLink
or, 1.3 - 1.6
THx-RNMarsh
Last edited:
DPH, Sorry, late reply. No it didn't work when I got it. One channel marginally worked. This one probably should just burn in for a while before I refresh it. I also had no experience working with SS gear. So I went back to college to learn about it.
Three classes left to earn my little associates electrical engineering technology. I've had disagreements with most of my instructors too. Most of it is grading issues of a factual point of view, but as a student I guess you are supposed to cow down to the power's that be.
My last instructor said the following when I pointed out the OpAmp diagram he depicted was incorrect and that I solved it correctly based upon the faulty diagram. "Your wrong" he told me, "I copied it verbatum from Paynter's test bank."
The Diagram had the Vin to ground, and ground to the - input of the op amp. The + input of the opamp had a resistor to it and terminal but not connected to anything. The only thing I could think of like this might be a dedicated plane in a multi-layer board and the pos might actually be surrounding the isolated signal plane so it wouldn't be detected and free from interference. I solved the problem for an inverting OpAmp.based on what I saw on the test. Instructor said the answer was 1+ my answer.
I made a choice long ago that I wasn't going to be bullied by instructors, I'll fight that in due time. But that is another story.
Cheers,
PostScript - At least no one brought up the research from "The Bell Curve". As long as it only Dunning-Kruger's experiments it is okay to discuss.
Last edited:
@scott, A paper in 1963 from Tektronix's wrote about this and identified it as group delay and warned about some of it's measurement consequences.
I think it's based on the work of a German or Russian guy who first mapped/graphed out "Filters". It was one of those "grail" books.
My Bad - I should have read beyond the first sentence of your post and not just scan the quoted paragraphs.
Or, did you edit your original post adding the pricing information?
Enquiring Mindlessness Wants to Know.
I think it's based on the work of a German or Russian guy who first mapped/graphed out "Filters". It was one of those "grail" books.
My Bad - I should have read beyond the first sentence of your post and not just scan the quoted paragraphs.
Or, did you edit your original post adding the pricing information?
Enquiring Mindlessness Wants to Know.
Last edited:
This description of feedback is total nonsense, a circuit reaches a steady state condition there is no other description of what is going on. I just added a little info without naming names, it suffices to say this guy is well accepted in the subjectivist posse.
My Bad II,
Dates incorrect at least for the Book. Citation follows:
Zverev, A. (1967). Handbook of Filter Synthesis. Consulting Engineer, Westinghouse Electric Corporation. John Wiley and Sons, Inc. New York, New York. U.S.A.
I'm still pretty sure the Tek discussion is from 1963. At least that date is stuck in my head.
Cheers,
Post Script - I just realized mine is the First Edition.
Dates incorrect at least for the Book. Citation follows:
Zverev, A. (1967). Handbook of Filter Synthesis. Consulting Engineer, Westinghouse Electric Corporation. John Wiley and Sons, Inc. New York, New York. U.S.A.
I'm still pretty sure the Tek discussion is from 1963. At least that date is stuck in my head.
Cheers,
Post Script - I just realized mine is the First Edition.
Last edited:
Does this comedian have any other material we can read?
I can say that after playing with an amp that has adjustsble global feedback, I can see why so many people enjoy no or low feedback - there are obvious reasons. It is an experience that would be good for everyone.
Attached are a couple of the graphs from the citation in post #1407 for your viewing pleasure.
Cheers,
Post Script - So much for steep slopes if we want to minimize group delay.
See left pic, last paragraph in the second column.
Cheers,
Post Script - So much for steep slopes if we want to minimize group delay.
See left pic, last paragraph in the second column.
Attachments
Last edited:
Well, I mean, I'm not opposed to listening to new things, but it seems a gross generalization to expect that there'd be some kind of no-gnfb "sound" unless there's a characteristic trend between them (thinking most SE Triode families)
Sync, sadly it looks like you got to experience the effect I described (D-K effect) to its fullest extent. Reminds me of my statics teacher in undergrad (most of my profs were good, sorry yours weren't!) where we repeatedly fixed his errors in class, then he'd defend himself in-class only to slap up a revised solution (the parts we brought up) the next lecture and claim that's what he said the entire time.
Sync, sadly it looks like you got to experience the effect I described (D-K effect) to its fullest extent. Reminds me of my statics teacher in undergrad (most of my profs were good, sorry yours weren't!) where we repeatedly fixed his errors in class, then he'd defend himself in-class only to slap up a revised solution (the parts we brought up) the next lecture and claim that's what he said the entire time.
I am working on an all open loop phono preamp, like Charley Hansen did before me. AND an extremely low nfb I-V converter (I have to make the distortion slightly lower than the phono because of the different operating points), and I have high hopes. This is what serious audio designers do!
Well you read this here all the time, so it's no wonder that it seeps through to marketeers. The problem is that what he writes is very intuitive, while real understanding needs an effort put in. Intuition is so comfortable in comparison.
Jan
I'm not sure to have understood what you said Or, may-be it is you ?
The question was extracting the error signal of a device witch has gain using a comparateur connected to input and output pins.
What feedback are-you talking about ?
Actually it is fairly easy to take a guess at the sound... but these are comments with one specific amp, one where no one prefers over 30% gnfb, and most are at 0% or 10%.
No-gnfb, how about ngf for short... Consider that in an SS device this can mean that the higher hz phase can be stumbling around like a drunk. This may enhance 2HD, but it at least encourages a similar blur effect as purposely introducing high RF (like a grounding box). So it is beneficial to mask moronic mix/mastering mistakes like raw hard left/right panning that make you think a guitar player suddenly lives in your speaker cabinet. It also makes bass warmer and more realistic. Its more realistic because a dampened speaker and room doesnt vibrate, but ngf makes it sound like stuff is vibrating sense it isnt so tight in sound, and gets that blur effect on the higher hz information that accompanies the lower hz fundamental...
It does not seem to expand the soundstage like you would get with a grounding box.
Using hgf (100%) suddenly can make the bass sound defined, powerful, but small and isolated. It literally takes you out of the music, and makes you feel like you are examining something. Mistakes in the mix/master shout out "over hear, isnt it great how I sound shitty like I am half a reflection from a wall in the studio" or many others, that make you want to faceplant into palm. You may also find out just how tuned in a particular direction speakers or such could be, like higher tweeter levels...
Obviously this would be different on some hot tubes, and hot classA SS may not exhibit as much difference. I suspect with tubes the character changes may be pretty different. From the tube stereos I have heard, it would seem a little apple to orange for what gnfb sounds like.
- Status
- Not open for further replies.