Feedback OpAmp Question

[Havenwood]

Hi!

When we make a buffer opamp, like:


Use TL082, we have a global NFB factor of 110dB, with 0dB gain,
now, what about the musicality? What about TIM distorsion?
This is a 100% error amplifier?

Douglas Self use a NFB factor of 30dB @20kHz

From LCAudio: 100% non-feedback = 100% musicality!
L C Audio Technology/The End Millennium

From Altmann Splif:The Feedback is what my idea deals with

Feedback is good. Especially negative feedback. Especially global negative feedback. It makes the amplifier linear. It makes the amplifier fast. It lowers distortion. It must be used at all cost. Its just a great invention, maybe the greatest in audio.
How true!

Feedback is bad. Especially negative feedback. Especially global negative feedback. It enables the loudspeaker to speak back into the amplifier. It messes everything up. There is no more music coming out. It must be avoided at all cost. It is just a great culprit, maybe the greatest in audio.
How true!
The ALTMANN SPLIF Amplifier Topology

And we have zero feedback amp, low feedback amp, etc.

I am interested in other opinions, and I know that this is controversial and subjective.

Is bad idea use buffer opamp with audio signals?

[Telstar]

No reply... interesting

[Juergen Knoop]

Originally Posted by Havenwood

Is bad idea use buffer opamp with audio signals?

no!
Regards

[jcx]

it is not possible to design a significant range of signal processing electronics without any negative feedback

the "no feedback" crowd either:

trys to deny the types of (local) negative feedback they use are feedback at all

or some allow for recognizing local feedback and reserve their definition of "bad feedback" as only refering to multiple stage or global feedback


it's also a trollish setting up of a straw man to use a 30 yr old op amp as your example - monolithic op amp performance has hugely improved since the TL084 was released while small signal discrete semiconductors for audio have mostly seen discontinued parts rather than improvements

[Telstar]

Originally Posted by jcx

or some allow for recognizing local feedback and reserve their definition of "bad feedback" as only refering to multiple stage or global feedback

The second, with one addition - no feedback in the OPS.

[Bonsai]

"Feedback is bad. Especially negative feedback. Especially global negative feedback. It enables the loudspeaker to speak back into the amplifier. It messes everything up. There is no more music coming out. It must be avoided at all cost. It is just a great culprit, maybe the greatest in audio.
How true!"

Have you been at the mushrooms again with Lumbar?

[scott wurcer]

Originally Posted by Havenwood

Hi!

Feedback is bad. Especially negative feedback.

Positive feedback better!

Are you sure it's not Altmann SPLEEF topology.

[traderbam]

Originally Posted by scott wurcer

Positive feedback better!

Are you sure it's not Altmann SPLEEF topology.

Spleef - Minepedia - The Minecraft Wiki!
You need to get out more, Scott.

[scott wurcer]

Originally Posted by traderbam

Spleef - Minepedia - The Minecraft Wiki!
You need to get out more, Scott.

Thinking more of the urban dictionary version

[nigel pearson]

Some op amps are not very good used as buffers . NE5534 is typical of one needing care , there is good advice in data sheets concerning this . I once asked the mathematician Micheal Geurzon ( spelling? ) what he thought about negative feedback . " I never have , if I had I might have said this . Some amplifier need a lot , some very little . You can bet most have the wrong amount " Michael went on to say an amplifier might have 3 or 4 stages , ideally it might have 3.5 stages . Michael died some time ago , his contribution to audio was filter design and improved microphone designs . I wanted to post his reply for all to read . Some may think it obvious , think carefully about that !