Replacing SOIC-14 opamps - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, 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 27th January 2011, 02:37 PM   #1
diyAudio Member
 
Join Date: Dec 2002
Location: Houston
Default Replacing SOIC-14 opamps

I am using a four channel digital interface. There is a stereo balanced volume control with a PGA4311. The unit sounds great now. A little power has been done on the power supply.
Looking inside, the four channels and headphone circuit all use a MC33179 quad opamp. These are 36 cent four channel opamps.
Looking, there are small ceramic bypasses at the power pins. The design appears competent enough to upgrade to a faster, higher bandwidth, lower distortion chip.
I ordered some OPA4132 and LME49740 chips yesterday. I hate to do too much boardwork with these SOIC-14 chips. The 4132 are close enough in BW and slew rate that they are no issue. The LME49740 is another animal. I worry about using a chip with 11 times higher BW.
The four channels are balanced, and two are subwoofer out and the other two everything else. My thoughts are to use the LME49740 for the 60 Hz and up and either the MC33179 or OPA4132 for sub. J never use the headphone and the stock chip is higher current for a heavy load.
Should I just stick the OPA in to avoid an issue with a screamer. Or if locally decoupled well enough, is the LME enough of an upgrade to gamble?

George
__________________
Cheapest is bestest
  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
Free Burr Brown Opamps OPA627AU SOIC if you can test them!!! LongJohnny Swap Meet 1 29th September 2007 09:31 PM
Replacing opamps on Pb-free board? macboy Parts 1 16th September 2005 03:17 PM
Any advice on replacing SMD Opamps PHilgeman Parts 5 1st April 2004 02:34 PM
sony scd555es and transformer replacing opamps Jaap Digital Source 0 31st December 2002 06:12 PM


New To Site? Need Help?

All times are GMT. The time now is 07:57 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