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Old 31st August 2009, 11:35 AM   #21
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Quote:
Originally Posted by Borat View Post
well op-amps do use tons of NFB ...

but can anybody actually hear the sound of an individual op-amp ?
Yes, they all have a flavor.
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Old 31st August 2009, 11:48 AM   #22
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Nelson,
a bitter, acrid flavor...
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Old 31st August 2009, 12:38 PM   #23
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Originally Posted by Lumba Ogir View Post
Nelson,
a bitter, acrid flavor...
Läkerol Salmiak?
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Old 31st August 2009, 01:05 PM   #24
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Originally Posted by Lumba Ogir View Post
Nelson,
a bitter, acrid flavor...
Yes, and I've spat most of them out. I think I could live wtih OPA627 and AD797 and maybe LME49720, but I haven't heard them all. There are some new ones I haven't heard that might be even better like OPA211, OPA827 and ADA4627.

I've found that by blending opamps I can almost get the sound I want.

Borat, a word of warning: the world of opamp rolling is addictive.
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Old 31st August 2009, 01:22 PM   #25
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[

Borat, a word of warning: the world of opamp rolling is addictive.[/QUOTE]

You bet just take a look at the guys at headfi
Becareful what you say on those threads too you might just end up
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Old 31st August 2009, 01:33 PM   #26
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Quote:
Originally Posted by Borat View Post
i mean can anybody reliably tell an op amp ( with gain set to zero ) from straight wire in double blind testing ?
The "gain set to zero" part is rather amusing.

Back in the early NE5534 and OP27 days, DIY folks even easily managed to distinguish between Signetics/Philips, TI, or Burr Brown manufacture for the same part number.
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Old 31st August 2009, 01:47 PM   #27
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Originally Posted by Wavebourn View Post
How would you define a high-end op amp?

And what is the differences between high-end an an ultra high-end?
high end op amp is one that has best performance.

ultra-high-end implies out of reach. no op-amp is out of reach so it doesn't really apply there.
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Old 31st August 2009, 01:52 PM   #28
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Originally Posted by mctylr View Post
Perhaps one downside amongst amateurs is that IC op-amps do require care and modest amount of complexity in circuit design and construction that may not be necessary or the same techniques as found in other circuit designs.
are you trying to say that its harder to build an amp using an IC than without one ?

how so ?
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Old 31st August 2009, 02:20 PM   #29
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Opamps have intrinsically high gain - far more than most amps need. To get rid of it, you have to burn it as negative feedback. High negative feedback can lead to stability problems.

Have fun, Hannes
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Old 31st August 2009, 02:44 PM   #30
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Originally Posted by h_a View Post
Opamps have intrinsically high gain - far more than most amps need. To get rid of it, you have to burn it as negative feedback. High negative feedback can lead to stability problems.

Have fun, Hannes
you can't get an op-amp with something like 40 db gain ?

how much gain would you ideally want in an op-amp for an amplifier with 30 db of gain ?
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