John, if you want a fully symmetrical design with asymmetrical properties, it is not a dilemma, it is a nonsense.
This is so ----. Wake up! I don't want to add a buffer! I want an op amp made properly for audio in the first place. Any FOOL can add a buffer, BUT it is more to pass through and more expensive as well.
john curl said:
I felt like a fool writing it too, but out of curiosity what is your source (eg turntable) and what is your minimum load (eg headphones).
Regards
Arthur
We've been here before, you would spec it, it would cost too much, and your Taiwanese build to print house would put something cheaper in the socket.
If it is made properly for audio, it is not an opamp. But if it is opamp, it is not made for audio... Probably for audio, but for the nearest consumer electronics' store, optimized for cost of a hamburger.
Hmmm... Trying to find some AD8010 to play with I opened 3 types of DSL modems I had in my barn, but did not find any... 🙁
The THS4275 has an open loop -3dB at about 50kHz - even good enough for me.
Kinda noisy, though: about 40nV/sqrt(Hz) @ 1kHz.....
And this is the dilemma as I see it: no OPAmp is perfect enough, so one often must design one's own amplifier.
Sigurd
Kinda noisy, though: about 40nV/sqrt(Hz) @ 1kHz.....
And this is the dilemma as I see it: no OPAmp is perfect enough, so one often must design one's own amplifier.
Sigurd
syn08 said:
Wavebourn said:
You won't find any in there. Most home units will have an integrated (CMOS) solution these days anyway. Even I don't have any of those.
A general warning, DSL drivers are packaged for the very high crest factor application i.e. they are very easy to burn up with full power sine waves. As a rule you must make good thermal contact to the heat tab, this is not an easy DIY. Find jcx's headphone stuff for hints.
This is pointless, and about as far from the CTC BLOWTORCH concept, as a typical Chevy is from a RUF-Porsche, in concept and execution.
It appears that no IC's are really, really good, and IC designers find no good reason to make them better for audio, just different.
I do know that the AD797 was used in some way by Dick Sequerra to make a phono stage, BUT he did significantly modify it from its original intent, and THAT is why he got extra special results. I just thought that using the 'best' for the stage IC's was a good idea, and it still will be, but it won't make a Porsche, only a VW, and NO tarting it up with output stages or load fets will change that. It is like taking a VW truck engine and putting it into a Porsche body. Been there and I know what that is all about.
Perhaps, we can discuss other details that made the BLOWTORCH so special to its owners, but with this intellectual climate, I don't see an easy direction. You see, subtlety is possible to be overlooked by typical designers, and jeered at when it is offered, even for free and with an open heart.
It appears that no IC's are really, really good, and IC designers find no good reason to make them better for audio, just different.
I do know that the AD797 was used in some way by Dick Sequerra to make a phono stage, BUT he did significantly modify it from its original intent, and THAT is why he got extra special results. I just thought that using the 'best' for the stage IC's was a good idea, and it still will be, but it won't make a Porsche, only a VW, and NO tarting it up with output stages or load fets will change that. It is like taking a VW truck engine and putting it into a Porsche body. Been there and I know what that is all about.
Perhaps, we can discuss other details that made the BLOWTORCH so special to its owners, but with this intellectual climate, I don't see an easy direction. You see, subtlety is possible to be overlooked by typical designers, and jeered at when it is offered, even for free and with an open heart.
john curl said:
Yes but a couple of folks have put stock Chevy drive trains into vintage Jaguars, nice lookin' cars that stay in tune for more than an hour at a time.
john curl said:
Q.E.D.
As expected, this is what all this noise about opamps was for: to help you concluding about yourself and your BT as surviving 40 years of technology advances. Perpetrating a myth at any cost, that's all you care about.
Elephant and Pug
Along the streets Big Elephant was led,
To show him off, most likely.
Since Elephants are not a common thing to see
A crowd of gapers followed on his heels.
All of a sudden Pug springs up in front of them.
And seeing Elephant, it raises a great rumpus,
It lunges, barks and howls
And does its best to pick a quarrel.
"Hey neighbor, stop the fuss,"
A mutt intones, "You? Deal with Elephant?
Look at you barking yourself hoarse, and he just strolls
Nonplussed
And doesn't care one bit about your noise."
"Ho ho!" Pug says,
"That's just what I enjoy,
Since I can be a real tough guy
Without a single blow or bruise.
That way, the other dogs will say:
"To bark at Elephant this Pug
Must be a real strong mug!"
--
A.I.Krylov, circa 1815
Along the streets Big Elephant was led,
To show him off, most likely.
Since Elephants are not a common thing to see
A crowd of gapers followed on his heels.
All of a sudden Pug springs up in front of them.
And seeing Elephant, it raises a great rumpus,
It lunges, barks and howls
And does its best to pick a quarrel.
"Hey neighbor, stop the fuss,"
A mutt intones, "You? Deal with Elephant?
Look at you barking yourself hoarse, and he just strolls
Nonplussed
And doesn't care one bit about your noise."
"Ho ho!" Pug says,
"That's just what I enjoy,
Since I can be a real tough guy
Without a single blow or bruise.
That way, the other dogs will say:
"To bark at Elephant this Pug
Must be a real strong mug!"
--
A.I.Krylov, circa 1815
I don't remember if Krylov wrote something about barking on the zoo full of of lions, cheetahs, leopards, hippos, etc... 😎
My thoughts about the BLOWTORCH this morning started by me independently realizing that no more BLOWTORCHES will ever be built, partially because Bob Crump, the guy who gave it most of its extra special quality, is deceased, and has been for years. I never learned how to make his line cords, so they never will be reproduced again, for example. However, that is my personal observation, and not important to the vast majority here. Bear understands, I'm sure.
It is interesting that Charles Hansen has made his own discrete version of an IC type design, recently, perhaps we can learn from him how to do it 'right'.
It is interesting that Charles Hansen has made his own discrete version of an IC type design, recently, perhaps we can learn from him how to do it 'right'.
Syn08, I don't know why you are so obnoxious, but enough is enough. Start a thread and show us what to do, but please don't do it here.
Scott, I am sure that German mechanical engineers are laughing themselves silly with your insight on great automobile designs. (and a few Americans, too!)
As far as I can tell syn08 has trumped you on MC noise and I think the effort stemmed from this running discussion.
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