OP_AMP...replacement...? - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

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 19th April 2006, 01:31 PM   #1
Lyra is offline Lyra  Norway
diyAudio Member
 
Lyra's Avatar
 
Join Date: Nov 2003
Location: Norway
Question OP_AMP...replacement...?

I've got a Phoenix Gold QX4150 4 ch. car-amp and this are using the "old" HA4741 op-amp in the input/ filter stage.
The sound from this amp is so and so...

Considering the "741-family" not very good for audio-use, I want to replace theese op-amps...

I was thinking about MC33079. I can get theese from SGS-Thomson, and ON-semi, would the manufacturer have an inpact on the sound ?

Is there any other Quad op-amp's available that would be better than the MC33079 ??

Lyra
  Reply With Quote
Old 19th April 2006, 07:25 PM   #2
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Unless the old op-amps have failed, don't look for a significant change in the overall sound of the amp. You may get slightly less noise but there should be no change in sound.

I've used both the MC33079 and the OPA4227. The 4227 has lower noise figures but is not always a good direct replacement due to instability in some circuits. If you don't have an oscilloscope to check for oscillation, I would suggest that you use the 33079.

Don't use the OPA4228 in a buffer or filter circuit. It's a good op-amp but it is not stable in a unity gain circuit.
  Reply With Quote
Old 19th April 2006, 11:15 PM   #3
Eva is offline Eva  Spain
diyAudio Member
 
Eva's Avatar
 
Join Date: Oct 2003
Location: Near the sea
Send a message via MSN to Eva
MC33079 is a quad version of LM833 and it's quite a good low-noise op-amp for its price (it's also available as "LM837").

Anyway, there are thousands of op-amps that will show better specs on paper than a 741. You could even just put a TL074 as well... But, is a change really required?
  Reply With Quote
Old 21st April 2006, 08:16 AM   #4
Lyra is offline Lyra  Norway
diyAudio Member
 
Lyra's Avatar
 
Join Date: Nov 2003
Location: Norway
....required....I don't know...but my thoughts was "no chain is stronger than the weakest link"...and in this equation the 741 is the most likely weak link...

I like the sound of the old 5532...what is the nearest quad-equivalent similar to this ?

Lyra
  Reply With Quote
Old 21st April 2006, 08:31 AM   #5
diyAudio Member
 
Join Date: Jul 2001
Location: The Netherlands
OPA4227,

the OPA227 series is my favorite opamp these days... the outperform the OPA627, AD797, NE5534, LT1007 in terms of THD and noise..
  Reply With Quote
Old 22nd April 2006, 08:24 AM   #6
diyAudio Member
 
cartman's Avatar
 
Join Date: May 2005
Location: Europe
Send a message via ICQ to cartman
Hi,

I have 4pcs OPA227 in cermaic socket - have you datasheet for this?

My other question:

I found 2pcs LM833N OPAs in my Philips CD940 CD-player, and I don't know this OPA.
What is the best recommended OPA instead of this LM833N for improvement?

Thx in advance!
cartman
  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
Replacement LED DreadPirate Parts 11 14th November 2009 05:45 PM
Old Amp Pot Replacement DeadSpeaker Solid State 0 10th December 2008 10:39 PM
Replacement amp for A-Bus? Greg911 Class D 0 16th November 2008 03:33 PM
Replacement for 5R4 Ralph Tubes / Valves 8 16th December 2003 11:02 AM


New To Site? Need Help?

All times are GMT. The time now is 02:00 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