Supporting cast is getting worse -
I wouldnt be surprised. Few people get to hear systems without some fairly high 2nd harmonic (at least). And, my own experience has been that lay people who rarely even listen to music do not like a system with bass much below what they have always heard -- saying, it has too much bass or it is bass heavy. Sometimes say the same about highs they never knew existed when hearing them for the first tiime. So, designing to others tastes and likes is a disaster zone unless it makes money for you. For myself, I am tired of listening to distortion in 'high-end' systems.
Now that the world is going mobile + small/tiny stuff.... the passive parts are getting worse... esp caps used in sm/tiny sizes. -50-60dB? While the IC's are very good, the supporting cast is getting worse. I dont want to see them used on a high-end pcb where analog is being processed. See
www.AVX.com/docs/techninfo/tantbench.pdf.
Thx-RNMarsh
I wouldnt be surprised. Few people get to hear systems without some fairly high 2nd harmonic (at least). And, my own experience has been that lay people who rarely even listen to music do not like a system with bass much below what they have always heard -- saying, it has too much bass or it is bass heavy. Sometimes say the same about highs they never knew existed when hearing them for the first tiime. So, designing to others tastes and likes is a disaster zone unless it makes money for you. For myself, I am tired of listening to distortion in 'high-end' systems.
Now that the world is going mobile + small/tiny stuff.... the passive parts are getting worse... esp caps used in sm/tiny sizes. -50-60dB? While the IC's are very good, the supporting cast is getting worse. I dont want to see them used on a high-end pcb where analog is being processed. See
www.AVX.com/docs/techninfo/tantbench.pdf.
Thx-RNMarsh
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RNMarsh,
For those people just put on an MP3 and they will be so happy........... I don't think that most people under 50 these days know what good audio sounds like. They are using their phones to play music and they don't own any except for bootleg MP3's anyway. Have you had a chance to get over to Hollywood and go to Amoeba Records? So much new vinyl, perhaps music quality will return to the masses some day.
For those people just put on an MP3 and they will be so happy........... I don't think that most people under 50 these days know what good audio sounds like. They are using their phones to play music and they don't own any except for bootleg MP3's anyway. Have you had a chance to get over to Hollywood and go to Amoeba Records? So much new vinyl, perhaps music quality will return to the masses some day.
And you are correct. The result of tests on LM4562 (more than 1 pc) was a permanent damage. The parts got higher Vos, above 10mV, but still working. OPA2134 and NE5532 survived the tests without damage.
The question is if the reason and explanation would be that simple. It would be nice if it was that simple, right?
You may try to add distortion (2nd harmonic or any other) to the music by maths. It is not that difficult. Let me know if it sounded "better" then, for anyone.
The second explanation is that the All-Mosfet design is pretty immune against EMI/RFI (no rectification, no demodulation) and the higher distortion is just a result of very simple circuits.
Listening tests of "distortionless" opamps like LT1028 x OPA627 would support my suggestion, IMO. LT1028 is on of those very sensitive to RFI. BTW, AD797 is NOT too sensitive to RFI, though not that immune as JFET opamps.
Yes, it sounds like discrete JFET circuit. It would be nice if it had lower voltage noise. But for low gain or buffer stage it is perfect.
250V/µs.
With AD826, that is the ones i use when i need diff inputs. But not so transparent than my current feedback OPAs and more noisy.
Look carefully at the ordered list of the OPA's you prefer, don't you find a correlation with their slew rates ?
When I worked with Walt in '94/'95 on the Audio Amateur superreg series I had considerable difficulty to keep the 797 stable in that application.
I was not able to convince Walt at the time, partly because the 797 measured the best of all the opamp tried.
Later on Walt appears to have abandoned the 797 (in the superreg app) also, but I am not sure which one he is now recommending.
@PMA: Yes the 844 is a well-kept secret in audio ;-)
jan
So it is true that there are secrets in audio
Just following my logic. I don't know much about audio, but there are things I know that I don't want to share. Logically, the experts know much more and may only want to share what is already in public domain.AD844: CFB, 2000V/µs
I have a plan to use a 3553 buffer, driven by 3554. They are fast but I didn't find current feedback has been mentioned in the datasheet. But I think it is. Not for audio, but why not? Any good comment to motivate me finishing the project?
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The 3554 is an old hybrid voltage feedback amp: http://www.datasheetcatalog.org/datasheet/BurrBrown/mXyzywq.pdfSo it is true that there are secrets in audio
I have a plan to use a 3553 buffer, driven by 3554. They are fast but I didn't find current feedback has been mentioned in the datasheet. But I think it is. Not for audio, but why not? Any good comment to motivate me finishing the project?
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