OPA827 available

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#22
Re: Opa1611???

QSerraTico_Tico said:



Sorry, there were no matches for opa1611.
Please revise your search and try again.

😕 :bigeyes: :bawling:
Edit:
http://www.diyaudio.com/forums/showthread.php?postid=1624573#post1624573

According to TI numbering system the single opamp would be the OPA611 and the dual OPA2611. I will seach again....Nothing on the TI site.:dead:
Click to expand...

No, the single one will be 1611, the dual one will be 1612. Probably they will anounce them in 2009. Sngles are available in a preview mode, while doubles are still out of specs.
 
#23
Re: Re: Opa1611???

Wavebourn said:


No, the single one will be 1611, the dual one will be 1612. Probably they will anounce them in 2009. Sngles are available in a preview mode, while doubles are still out of specs.
Click to expand...


Sorry, I dunno if your information is reliable but I could not found any OPA1611 on the TI site or with Google. Only the link to your post came up.
:bawling:
 
#24
lineup said:
About opamp "sounds".
It is my firm belief that any device in an audio chain
with a Signal Distortion les than 0.1 - 0.05 %
will not effect signal quality in a a way any man can hear.
Personally, I do not believe in ghosts either ....... 😀 😀
If I get valid proof of the contrary, I will change my mind.

Now, some nice people are born with a very vivid imagniation.
There is not much we do about this.
They are created not to be guided by any logical thinking.
It is probably something with what half of brain we use.

[/B]
Click to expand...
I very much disagree to this statement. I've said it before - if there's no difference between "good" opamps, and they're totally flawless, we can all stop our quest for the perfect sound. When I can hear a clear difference between transistor A and transistor B, why wouldn't I hear the difference between opamp A and B when they consist of many transistors? Does all amps sound the same? Allmost all have very low distortion. THD isn't all. I've used many different opamps in many different setups, and I know they all have a sound of their own, including LME49710/20/LM4562. You're not very consistent when you say you regard the LME as your favourite and then say all opamps with a distorton less than 0.1% sound the same. I'm not a ghosthunter and I wish I had a more vivid imagination.

Back to the topic. I know some of you have tried OPA829. How does it sound?
 
#25
Nelson I agree with your statement I can also hear differences even between transistors. I think we can do this because of the use of high quality headphones, which is much more sensitive and closest to what we can get to perfect speaker. When I use my floor standers I find it much harder to pick up differences.

Age plays a factor here too. Hearing degrades with age. Just a couple of days ago on these threads one could read, the following.

<Although THD measured higher using the CCS, both younger engineers partaking in the experiment agreed that the CCS amp sounded crisper.
I am 50+ and a bit disappointed, because I could hear no difference between the two>.
 
#27
Re: Re: Re: Opa1611???

QSerraTico_Tico said:



Sorry, I dunno if your information is reliable but I could not found any OPA1611 on the TI site or with Google. Only the link to your post came up.
:bawling:
Click to expand...

I dunno if scanning of a flyer from AES is a copyright violation or not.

homemodder said:
Nelson I agree with your statement I can also hear differences even between transistors. I think we can do this because of the use of high quality headphones, which is much more sensitive and closest to what we can get to perfect speaker. When I use my floor standers I find it much harder to pick up differences.

Age plays a factor here too. Hearing degrades with age. Just a couple of days ago on these threads one could read, the following.

<Although THD measured higher using the CCS, both younger engineers partaking in the experiment agreed that the CCS amp sounded crisper.
I am 50+ and a bit disappointed, because I could hear no difference between the two>.
Click to expand...

I have a different opinion: with age some people may learn something useful, the same they learn to ignore differences.

Speaking of low THD and audibility, what is often misunderstood, is dynamic of change of errors that is more significant than errors themselves.
 
#29
There are definetley differences in sound between amplifiers and op-amps. No question, because I've heard them. Of course, we know today how to design circuits that avoid common pitfalls that affect the sound in a bad way. This is why audio op-mps for example have slew rates of typically 20V/uS, low noise and in a lot of cases, quite good output drive capability (e.g. many are spec'd driving 600 Ohm loads - and they still perform well). Even after ensuring good design practice is 100% met though, amplifier circuits do sounf different ('sonic signature')

The debate that rages on this forum in general is one around the statement 'IC op-amps can never sound as good as discrete designs'

In my view (having heard both), IC solutions are very, very good. I won't say either is best, but I do not agree with the position 'IC op-amps can never sound as good as discrete designs'.

However, back to the topic. I have finished laying out my pre-amp and the main gain element is a LME4562 (2 per channel configured in unbalanced input to balanced output . I'm ordering the boards in a few weeks - looking forward to trying them out. I'll socket the op-amps initially, then I can swap them out and try a few of the others I have not tried yet (duals only I am afraid).

Might be an idea in the future to build a board where one could switch between different op-amps in a direct AB comparison.
 
#31
Hi Forr,

And some nice people are not born with very vivid imagination just very good and sensitive ears that can distinguese between small sound differences. Everyone is born with some particular talent ie high intelligence, manual dexterity, physical strenght, well developed verbal cords for singing while others can just croak etc, this is natures way. Senses can be developed to a extent as well according to need, ie ever notice how a blind person can pinpoint where a friend is in a room of 50 people all chatting away or, recognise a person by hearing the way they walk. Some people can even hear a dog wistle while to others no sound that can be heard has been emited.

Im sorry to say but in your and Lineups case nature wasnt kind with your ears and\or it has been affected by age <Google search presbycusis>. When was the last time you visited a audiologist???.

Wavebourn could you show us a discreet circuit of your design without these errors. BTW your headphone amp sound very good similar to Kumisa III, very nice design with half the complexity.
 
#32
homemodder said:

Wavebourn could you show us a discreet circuit of your design without these errors. BTW your headphone amp sound very good similar to Kumisa III, very nice design with half the complexity.
Click to expand...

Design "without these errors" means no such topologies like diffstage+VAS+complementary emitter followers. That headphone amp was still suboptimal: too small headroom, though more than enough for headphones. It was an exercise to show how using parts from Lineup's design to build better sounding device.
 
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