A short, simple answer is: Use as little feedback as will make a circuit perform well. Design a good circuit to start with, and it will not need much feedback.
Like so many things in engineering, you need to use feedback with care and it can be of huge benefit. Ages ago in the early days of transistor amps feedback lead to talks about slew rate and Transient Intermodulation Distortion but nowadays those are mostly gone issues in good audio designs. Class-D amplifiers are particularly tough to manage with feedback as the output is pulsed with a speaker load that changes the signal shape.
@Douglas Blake Yeah, feedback can make an amplifier almost perfect in terms of clean voltage amplification at all audible frequencies. Checking the amp with a square wave can help show how well the feedback tracks against the input but nowadays it's easy to avoid TIM issues.
The only evil of negative feedback is that it will broaden the frequency response by taking away the higher gain as you go lower in frequency.. that’s how it broadband’s frequency range, by taking away the higher gain as you go lower in frequency, depending on the feedback factor employed.. also useful for modifying the input and output impedances of an amplifier depending on how it’s applied and can supply what’s actually required as per the amp’s application requirements. You can call it evil all you want, but it’s a necessary evil, and you never get something for nothing in physics. Don’t lose sleep over it.
Of course what Paul fails to mention is going from from a balanced to unbalanced signal typically involves the use of Op-Amps with lots of negative feedback. Not to mention the buffer op-amps that are part of most high-end D->A systems. ALL analog tone controls EQ's and analog filters (including RIAA) are based on the creative use of negative feedback principles. What's the purpose of the "whispers"?. Too much feedback maybe ?
It's not true that all top hi-end systems use balanced connections. Why? Because eventually you need to output an unbalanced signal to loudspeakers, and such conversion isn't lossless. Examples: Most tube amps, such as Kondo or Jadis. Even many solid-states like Reimyo.
Of course, not all "anything" is true but what I am referring to is the vast majority. And, to set the record straight, there are plenty of balanced output power amplifiers. All PS Audio power amplifiers, for example, have balanced outputs to the loudspeakers.
No crazy is when you are a steel erector on night shift and one of the directors of the company you work at phones you up at 3 in the morning to ask you how the job is coming along and he is on day shift.
Paul-many of us love to hear you ramble and rant. Its why we watch.
Let's drag 1/4 of a drum kit into the set to make it appear we're actually doing something with them.
A short, simple answer is: Use as little feedback as will make a circuit perform well.
Design a good circuit to start with, and it will not need much feedback.
Feedback sets the damping factor ... phase cohesion is of vital importance.. ref to Nyquist Criterion about feedback ...
What happened with feed forward? Some years ago, Sansui experimented with it on a receiver or integrated amplifier model.
I have that exact Yamaha hybrid maple drum set! its amazing
Lets Go XLR !! So lets say our Pre-amp has balanced inputs but single ended
pre outputs will the 'noise' still be cancelled going to the amp ?
Yamaha AHM, excellent choice of drums
Balanced cables make a world of difference. I never hear anything on my system but music against a
Quiet background.
Like so many things in engineering, you need to use feedback with care and it can be of huge benefit. Ages ago in the early days of transistor amps feedback lead to talks about slew rate and Transient Intermodulation Distortion but nowadays those are mostly gone issues in good audio designs. Class-D amplifiers are particularly tough to manage with feedback as the output is pulsed with a speaker load that changes the signal shape.
@Douglas Blake Yeah, feedback can make an amplifier almost perfect in terms of clean voltage amplification at all audible frequencies. Checking the amp with a square wave can help show how well the feedback tracks against the input but nowadays it's easy to avoid TIM issues.
Not everyone in Australia hates Hendrix
lol Paul, sounds spooky, can't wait for tomorrow thanks Paul.
It's really weird to see a single head kick drum.
The only evil of negative feedback is that it will broaden the frequency response by taking away the higher gain as you go lower in frequency..
that’s how it broadband’s frequency range, by taking away the higher gain as you go lower in frequency, depending on the feedback factor employed.. also useful for modifying the input and output impedances of an amplifier depending on how it’s applied and can supply what’s actually required as per the amp’s application requirements. You can call it evil all you want, but it’s a necessary evil, and you never get something for nothing in physics. Don’t lose sleep over it.
Of course what Paul fails to mention is going from from a balanced to unbalanced signal typically involves the use of Op-Amps with lots of negative feedback. Not to mention the buffer op-amps that are part of most high-end D->A systems. ALL analog tone controls EQ's and analog filters (including RIAA) are based on the creative use of negative feedback principles. What's the purpose of the "whispers"?. Too much feedback maybe ?
Hello Paul! I noticed a Wegmans Supermarket shopping bag against the wall behind you. What is that? Wegmans in Colorado now?😀😀😀
It's not true that all top hi-end systems use balanced connections. Why? Because eventually you need to output an unbalanced signal to loudspeakers, and such conversion isn't lossless. Examples: Most tube amps, such as Kondo or Jadis. Even many solid-states like Reimyo.
Of course, not all "anything" is true but what I am referring to is the vast majority. And, to set the record straight, there are plenty of balanced output power amplifiers. All PS Audio power amplifiers, for example, have balanced outputs to the loudspeakers.
No crazy is when you are a steel erector on night shift and one of the directors of the company you work at phones you up at 3 in the morning to ask you how the job is coming along and he is on day shift.
Global feedback being *evil* is not a mystery. The real mystery is *HOW DID PAUL GET A WEGMANS REUSABLE SHOPPING BAG???*
Está bem então
Yes yes yes FIRST again I get 🥇🏆🍾🥂👏🇳🇱 and everlasting fame I was so fast to click!
LOL! Viewer #16 and also from The Netherlands! 🇳🇱
Poor soul when that's an achievement for you
@@Harald_Reindl I'm waiting all day long... Refreshing and refreshing TH-cam for the latest PS Audio video
@@hugoromeyn4582 well, if you have no music to hear - no time to wait for anything with 90000 tracks waiting to hear