Upgrading ICs in headphone amps - diyAudio
Go Back   Home > Forums > Amplifiers > Headphone Systems

Headphone Systems Everything to do with Headphones

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 26th September 2012, 12:08 AM   #1
batty is offline batty  Australia
diyAudio Member
 
Join Date: Jan 2010
Location: Adelaide South Australia
Default Upgrading ICs in headphone amps

I am considering buying some Moon modules from Audio-gd to replace the OPA 2134 I have in my headphone amp, has anyone tried this, I also have ordered an AD823AN as it was cheap.
__________________
Townshend Rock II, My new TT since 1986.
  Reply With Quote
Old 26th September 2012, 12:56 AM   #2
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
it might be handy to know what amp specifically you are talking about…
  Reply With Quote
Old 26th September 2012, 01:00 AM   #3
diyAudio Member
 
Join Date: Jul 2008
Location: Ames, Iowa
Waste of time and money. Unless the amplifier was designed incorrectly in the first place and is not meeting the requirements of the op-amp; it is unlikely that the performance would increase.

If you are going to:
-Measure the before and after performance with test equipment.
-Modify the amplifier to the requirements of the new op-amp.
-Use a proper audio op-amp and not one designed for something else.

Then you may be able to net a performance increase but at that point you had might as well just design your own amplifier.

If it sounds different after you changed the op-amp it will be because:
A)The amplifier incompatible with the original op-amp
B)The new op-amp is more compatible than the old op-amp
C)You think it sounds different when it really doesn't (NOTE: the above two are more likely in this circumstance).

So again, waste of time and money.
__________________
o2 PCB Stragglers
  Reply With Quote
Old 26th September 2012, 02:32 AM   #4
batty is offline batty  Australia
diyAudio Member
 
Join Date: Jan 2010
Location: Adelaide South Australia
I have 2 amps, both built from kits, the CMoy and one from Oatley Electronics.

Edit: I have a pair of OPA627s coming too
__________________
Townshend Rock II, My new TT since 1986.
  Reply With Quote
Old 26th September 2012, 03:41 AM   #5
jcx is online now jcx  United States
diyAudio Member
 
Join Date: Feb 2003
Location: ..
the 1st question is always - what headphone? - impedance, sensitivity numbers

headphones vary by orders of magnitude in these parameters, impacts amp requirements
  Reply With Quote
Old 26th September 2012, 04:08 AM   #6
batty is offline batty  Australia
diyAudio Member
 
Join Date: Jan 2010
Location: Adelaide South Australia
HD414 at the moment looking at 595s
__________________
Townshend Rock II, My new TT since 1986.
  Reply With Quote
Old 26th September 2012, 08:04 AM   #7
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
Quote:
Originally Posted by BionicSniper View Post
Waste of time and money. Unless the amplifier was designed incorrectly in the first place and is not meeting the requirements of the op-amp; it is unlikely that the performance would increase.

If you are going to:
-Measure the before and after performance with test equipment.
-Modify the amplifier to the requirements of the new op-amp.
-Use a proper audio op-amp and not one designed for something else.

Then you may be able to net a performance increase but at that point you had might as well just design your own amplifier.

If it sounds different after you chClick the image to open in full size.anged the op-amp it will be because:
A)The amplifier incompatible with the original op-amp
B)The new op-amp is more compatible than the old op-amp
C)You think it sounds different when it really doesn't (NOTE: the above two are more likely in this circumstance).

So again, waste of time and money.
I know you are just towing the party line, but this is rather incomplete and one line didnt fit your conclusion, but you simply ignored that and made it fit.

Quote:
B)The new op-amp is more compatible than the old op-amp
which can relate to fitting the amp, or the headphone load better, how pray tell would that be a waste of time and money? sorry but this is most certainly not a perfect model of a world we live in, design mistakes, as well as unexpected load interactions can and do happen. your model for reality is flawed (oversimplified) and thus useless

a simple CMOY is never going to meet your expected model, but youre correct, while you may make some changes by choosing a better opamp for it, it would be better to just choose a properly designed amp and build it

Last edited by qusp; 26th September 2012 at 08:08 AM.
  Reply With Quote
Old 26th September 2012, 08:29 AM   #8
Mooly is online now Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
You can sweat the technical stuff ad-infinitum... the reality is that opamps can and do sound different although those differences escape being qualified in the normal sense.

Try the wild card... the TLE2072 excalibur FET opamp which as excellent drive ability.

And as always,
Swapping Op-Amps... you have checked to see it's stable haven't you ?
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 26th September 2012, 01:54 PM   #9
diyAudio Member
 
Join Date: Apr 2010
the TLE2072 is nothing more then a slightly quieter tl072 they sound the same they can be pleasing in the right circuit but nothing amazing
  Reply With Quote
Old 26th September 2012, 03:07 PM   #10
Mooly is online now Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by doulos24 View Post
the TLE2072 is nothing more then a slightly quieter tl072 they sound the same they can be pleasing in the right circuit but nothing amazing
Not so

There are many differences. The TLE2072 has a -/+ 80ma output capability (per opamp in the dual package) which puts it way ahead of the competition.
Slew rate of around 35V/us, a wider operating voltage range.......
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  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
headphone amps vs headphone inputs? awangotango Headphone Systems 7 13th October 2012 01:36 AM
Upgrading/repairing vintage amps jooch Solid State 22 24th December 2011 02:54 PM
Panasonic DVD-H1000 op amps worth upgrading? dkhsu Digital Source 6 14th January 2011 05:01 PM
Upgrading op amps in a Denon DCM-460 CD player stank0 Solid State 0 18th January 2010 05:47 PM
Need some advice rebuilding/upgrading 2 power amps. SuperKris Solid State 31 26th May 2009 04:24 AM


New To Site? Need Help?

All times are GMT. The time now is 06:27 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