Slew rate value

Luke123 · 6th April 2005, 12:54 PM

Just curious about this...
For preamp puposes, what slew rate value could be considered as optimal?
5,10,20, 40V/µSec or more? Or less?
What to think about two opamps that have same GBW product ,but with different slew rates? Like comparing OPA227 (2.3V/µS) and OPA134 (20 V/µS) while both have 8MHz BW.

Luke123

homer09 · 6th April 2005, 10:23 PM

i dont think slew rate is a critical spec when looking for sound quality. other more important factors at play

jackinnj · 6th April 2005, 11:31 PM

Quote:

Originally posted by homer09
i dont think slew rate is a critical spec when looking for sound quality. other more important factors at play

i think you have just thrown the fat in the fire for one of those mega-threads.

mr jung would probably disagree with you:
"bandwidth, compensation, and slew-rate considerations are some of the most important sources of error that will be encountered in op amp circuitry" -- Jung, Walt, IC OPAMP COOKBOOK, 3rd Edition, pg 58.

homer09 · 7th April 2005, 12:04 AM

Quote:

Originally posted by jackinnj

i think you have just thrown the fat in the fire for one of those mega-threads.

mr jung would probably disagree with you:
"bandwidth, compensation, and slew-rate considerations are some of the most important sources of error that will be encountered in op amp circuitry" -- Jung, Walt, IC OPAMP COOKBOOK, 3rd Edition, pg 58.

oops, wasnt my intention. maybe i was too harsh with my judgement, lemme rephrase:

slew rate may be a critical spec when looking for sound quality, but other factors are also at play and should be considered

Luke123 · 7th April 2005, 12:16 AM

Homer

"...but other factors are also at play and should be considered
"

Tell me about the other factors...I'm just curious.

Luke

homer09 · 7th April 2005, 12:30 AM

well jackinnj mentioned another two for starters...

and i think the real test is your personal listening preference. i always find that best specs dont equal best sonics for me. a visit to a HIFI show last weekend confirmed it for me. the systems for which the creators were defending with specs did not sound best to me.

so maybe you should poke around and see what people's listening impressions are of those different opamps, or maybe try them yourself

6th April 2005, 12:54 PM	#1
Luke123 diyAudio Member Join Date: Jan 2004 Location: Quebec	Slew rate value Just curious about this... For preamp puposes, what slew rate value could be considered as optimal? 5,10,20, 40V/µSec or more? Or less? What to think about two opamps that have same GBW product ,but with different slew rates? Like comparing OPA227 (2.3V/µS) and OPA134 (20 V/µS) while both have 8MHz BW. Luke123

6th April 2005, 10:23 PM	#2
homer09 diyAudio Member Join Date: Jan 2004 Location: Montreal	i dont think slew rate is a critical spec when looking for sound quality. other more important factors at play __________________ Most people wouldn't know good music if it came up and bit them in the ***. - Frank Zappa

7th April 2005, 12:30 AM	#6
homer09 diyAudio Member Join Date: Jan 2004 Location: Montreal	well jackinnj mentioned another two for starters... and i think the real test is your personal listening preference. i always find that best specs dont equal best sonics for me. a visit to a HIFI show last weekend confirmed it for me. the systems for which the creators were defending with specs did not sound best to me. so maybe you should poke around and see what people's listening impressions are of those different opamps, or maybe try them yourself __________________ Most people wouldn't know good music if it came up and bit them in the ***. - Frank Zappa

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7th April 2005, 12:16 AM	#5
Luke123 diyAudio Member Join Date: Jan 2004 Location: Quebec	Homer "...but other factors are also at play and should be considered " Tell me about the other factors...I'm just curious. Luke

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