Preamp OP-AMP...help. - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 9th November 2012, 07:00 PM   #1
Izuall is offline Izuall  Romania
diyAudio Member
 
Join Date: Aug 2012
Default Preamp OP-AMP...help.

So ive rolled a few OP-AMPs on my soundcard..and ive found that the AD8599 to
offer the best sound for my ears.Only complain i have its that its a bit rough around the edgets more on the high end of the freq range.
I wonder if i can smoothen those rough edges without loosing any of the benefits this IC has to offer.
Will changing the NE5532P in the preamp stage of my active speaker sistem with another help in this mater?Im thinking the OPA2134 witch seems to be close in specs to the NE5532 but sounds smoother,cleaner(in the soundcard at least,i have no idea how it will sound on another circuit).

Thank you in advance.
  Reply With Quote
Old 9th November 2012, 07:12 PM   #2
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Moved to Analogue Line Level

First you need to understand that swapping opamps isn't always a case of "plug and play". How do you know its not oscillating at HF and that that is the cause of the "rough" sound at HF ?

Swapping Op-Amps... you have checked to see it's stable haven't you ?

As to replacing the NE5532 with the OPA2134. Well that is one swap that does stand a good chance of not just working but also being a noticeable sonic improvement. But as allways... you should check and confirm all is well.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 9th November 2012, 08:26 PM   #3
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

You can't roll op-amps like you can (to an extent) valves.

Its very difficult to improve on op-amps well chosen for purpose,
if the choice has a cost constraint, then it is possible, at expense.

rgds, sreten.

Correct choice is far more important than cost or reputation.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
  Reply With Quote
Old 9th November 2012, 09:31 PM   #4
Izuall is offline Izuall  Romania
diyAudio Member
 
Join Date: Aug 2012
1st. well i might have missused the term rough...the op am seems stable(i have a very sensitive ear..so i can hear even the smallest of changes),there are no oscilations as far as im aware ..what i ment by "rough around the edges" was actulaly the fact that this chip delivers a slithly sharp HF range ..and id like to "soften the edges" a bit.

"Correct choice is far more important than cost or reputation."

That is true..like i previously stated ive tried a few OP-ams on my soundcard the first one was the National LME49720..and i dont like it..like i said ive picked the AD8599 as i like it the most out af the chips i tryed and i tried a few..
  Reply With Quote
Old 9th November 2012, 09:39 PM   #5
diyAudio Member
 
Join Date: Sep 2011
Location: Texas
Quote:
Originally Posted by sreten View Post
Hi,

You can't roll op-amps like you can (to an extent) valves.

Its very difficult to improve on op-amps well chosen for purpose,
if the choice has a cost constraint, then it is possible, at expense.

rgds, sreten.

Correct choice is far more important than cost or reputation.
I have to disagree with you when age comes into play. The 4558s in my Biamp equalizer were one of the few afforable options in the late 1970's. Now they are more than deprecated.

Here the question isn't whether there is a better replacement (even for the same price). The question is how and with what?...
__________________
2X Com-tech 400, Improved Headphone Amplifier
  Reply With Quote
Old 9th November 2012, 10:19 PM   #6
Izuall is offline Izuall  Romania
diyAudio Member
 
Join Date: Aug 2012
Well mostly its about what sounds better to you.Every op-amp has its own flavor if used corectly.I like the AD8599 as a buffer for my souncard as i enjoy the sound it produces.
What i wanted to know and check(as i havent tampered with my active speakers yet)was that if the OPA2134 would be a good idea to replace the 5532P in the preamp stage.(i found that they share similar traits..when used in the soundcard with the OPA2134 delivering more detail and having a smoother sound ovarall).
  Reply With Quote
Old 10th November 2012, 01:17 AM   #7
Jay is offline Jay  Indonesia
diyAudio Member
 
Join Date: Feb 2003
Location: Jakarta
Yes, when you design an opamp circuit you will know that most other opamps will not work optimally in the same circuit. Some, even better opamps, will just not work.

When I roll opamps (we don't always have reliable models for opamps, do we?), I expect to get better result from high quality build opamp, especially from Analog Device, which has more or less the same (or slightly more) slew rate than the original.

I don't know, AD opamps are just good.
  Reply With Quote
Old 16th November 2012, 10:33 AM   #8
diyAudio Member
 
Join Date: Sep 2004
Location: New Zealand
Hi Izuall
To get a better sound from op amps you need to improve the power supply to each rail. whilst traditional decoupling using capacitors is always good and necessary the use of transistors as shown at blog: opamp - opamp construction under section power supplies and opamps, is worthwhile trying.

Cheers / Chris
  Reply With Quote
Old 30th November 2012, 05:42 PM   #9
Izuall is offline Izuall  Romania
diyAudio Member
 
Join Date: Aug 2012
Thx everyone for the help.Ive done some testing and went for the AD8599 in the preamp stage of the active speaker system and the OPA 2228 in the sondcard the result is very satisfying keeps the tonal wormth of the OPA and ads the life and involvement of the AD IC.
  Reply With Quote
Old 30th November 2012, 08:20 PM   #10
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Quote:
Originally Posted by Izuall
1st. well i might have missused the term rough...the op am seems stable(i have a very sensitive ear..so i can hear even the smallest of changes),there are no oscilations as far as im aware ..what i ment by "rough around the edges" was actulaly the fact that this chip delivers a slithly sharp HF range ..and id like to "soften the edges" a bit.
You would need a very sensitive ear to hear supersonic oscillation as such. What it can sometimes do is present itself as slight roughness in the audio range. Other times it is completely inaudible, or produces obvious distortion.

Quote:
Originally Posted by Chris Daly
To get a better sound from op amps you need to improve the power supply to each rail. whilst traditional decoupling using capacitors is always good and necessary the use of transistors as shown at blog: opamp - opamp construction under section power supplies and opamps, is worthwhile trying.
I thought we had seen off that transistor nonsense a couple of years ago. Please don't make us go through the pain again of trying to explain it to you.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need help choosing op amp for active crossovers and preamp Jonathan Z Solid State 20 1st September 2010 12:49 AM
Tube+OP My headphono & preamp soro Tubes / Valves 0 17th July 2010 10:57 AM
Op amp based preamp with discrete output hags Solid State 11 17th September 2007 10:24 AM
Discrete Op Amp Ideas for a Preamp analog_guy Solid State 16 16th June 2007 05:18 AM
op-amp based preamp advice needed Adam Solid State 11 18th November 2002 03:14 PM


New To Site? Need Help?

All times are GMT. The time now is 03:30 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2