Substitute OPA637 for TL072?? - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, 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 1st March 2011, 05:43 AM   #1
diyAudio Member
 
Join Date: Mar 2011
Question Substitute OPA637 for TL072??

I have BK Butler Tube Driver with a TL072 in it. It's a little dark sounding and I'd like to try other opamps so I picked up a OPA637, AD8066 and a AD8620 all of which I think are direct replacements.

Luckily the TL072 is on a socket. I swapped in the OPA637 but when I hit the switch it doesn't work. Pulled it and no bent pins, looks fine. Went back to the TL072 and it works. Ok, maybe it's a bad chip. Got it from Digi-key so it should be alright but who knows.

I put the AD8066 on a Brown Dog adapter, plugged it in and same as the OPA637.

what am I missing here?

Thanks
  Reply With Quote
Old 1st March 2011, 06:04 AM   #2
diyAudio Member
 
Join Date: Dec 2005
Location: Kuala Lumpur
TL072 is a dual
OPA637 is a single, decompensated for gain >5
  Reply With Quote
Old 1st March 2011, 06:13 AM   #3
diyAudio Member
 
Join Date: Mar 2011
Ah, right.
The TL072 sounds veiled, lacks clearity to me so what would be a good sub.
  Reply With Quote
Old 3rd March 2011, 04:07 AM   #4
diyAudio Member
 
Join Date: Mar 2011
Alternative can be used OPA2604
  Reply With Quote
Old 3rd March 2011, 06:52 AM   #5
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
"Ah right". Trying to mix single and dual opamps indicates that you did not check any datasheet which implies you don't know what you are doing. This is not meant negatively but simply doing things to see what happens will cost you money, time and grief. Always check specifications before even thinking of swapping parts.

OPA2604 is better than TL072 and relatively cheap. It is a direct replacement but I would decouple the power pins for best results. OPA637 is much better but then you would have to use an adapter for 2 x single DIL to DIL8. So you would need 2 x OPA637.

But OPA637 can only be used if the amplification is more than 5 x. Otherwise its "unity gain stable" brother OPA627 should be used.
__________________
It's only audio. Official member of the Norske Brillegeit Gang.
  Reply With Quote
Old 3rd March 2011, 07:19 AM   #6
diyAudio Member
 
Join Date: Oct 2004
Default opa2134 or opa2132

opa2134 or opa2132 way better than a tl072 and cheaper than a 637 / 627 and dual same pinout
  Reply With Quote
Old 3rd March 2011, 08:41 AM   #7
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
If you find the TLO72 "dark" try the LM4562 or even an NE5532 although it would help to see the circuit. I'm assuming any offsets (or lack of) due to the original being a DIFET device are of no concern here.

Just try them...
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 3rd March 2011, 09:18 AM   #8
diyAudio Member
 
nelsonvandal's Avatar
 
Join Date: Nov 2006
AD8620 and AD8066 are both dual opamps. OPA072 is good for 36V, AD8620 26V and AD8066 24V. What's the supply? OPA072 is slow, AD8620 is fast and AD8066 is very fast. It could be a "bad" circuit layout not suitable for fast opamps. Decoupling caps in close proximity to the opamp's power pins often solve this problem.

If you can get those Analog opamps to work in your circuit, you'll certainly wont find them veiled. They're on the harsh side, I think.

If it doesn't have to be a FET input opamp you should try LME49720 (=LM4562). I think it'll have the clarity you want.
  Reply With Quote
Old 16th December 2011, 11:16 AM   #9
diyAudio Member
 
formula 22's Avatar
 
Join Date: Sep 2011
Location: El Triunfo
Hi all!
What can be substituted in this circuit for the OPA637?
Thanks
Attached Images
File Type: gif RIAA phono amplifier with OPA637.gif (37.1 KB, 192 views)
  Reply With Quote
Old 16th December 2011, 11:26 AM   #10
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
The OPA134 should be be good as too the OPA604.

A TL071 will work although not optimal.

You have to stick with FET input device as the input is DC coupled and you want to ensure no bias current flows in the cartridge not to mention offset problems.
__________________
-------------------------------------------------------
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
by what to replace the TL072? seb83 Analog Line Level 13 1st January 2012 06:44 PM
TL072 or NE5532 (or TL074) Which is best? pekinin Analog Line Level 1 24th April 2009 11:14 PM
TL071 and TL072 upgrades paba Solid State 7 10th October 2008 03:23 PM
TL072 vs. 4560? kubeek Parts 8 14th July 2006 08:42 PM
TL072 replacement Smiffy Digital Source 1 26th October 2003 10:39 AM


New To Site? Need Help?

All times are GMT. The time now is 09:13 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