moley1390

OPA4134UA vs. LM837 as replacement for TL074
« on: June 21, 2012, 12:41:30 PM »
Just a quick question, wondered if anybody would like to weigh in on this?

I know there are countless opamp threads, but I'd really be interested in a direct comparison. Datasheets:
http://www.farnell.com/datasheets/1361012.pdf
http://www.national.com/ds/LM/LM837.pdf

Hopefully someone out there may have had some experience with both.

Note: OPA4134 is the 4 amp version of 1134, 2134

Thanks!


JohnRoberts

Re: OPA4134UA vs. LM837 as replacement for TL074
« Reply #1 on: June 21, 2012, 01:05:01 PM »
While it is difficult to answer such questions without looking at the application, from a distance the 4134 with a FET input is more similar to the TL074 than the LM837 with pnp transistor input.

JR
John Roberts
http://circularscience.com
Tune it, or don't play it...

pucho812

Re: OPA4134UA vs. LM837 as replacement for TL074
« Reply #2 on: June 21, 2012, 01:45:52 PM »
for what it's worth, it's common to replace tl071 with opa134 chips. Results are often said to be more pleasing to ones ear. So I could see replacing a tl074 with opa4134 in terms of it would work but I cannot comment on the sonics as I have never done it. 
Every mic has a purpose it might be a door stop or a hammer, but every mic has a purpose.

usekgb

Re: OPA4134UA vs. LM837 as replacement for TL074
« Reply #3 on: June 22, 2012, 01:17:57 AM »
I've done it a few times.  It works pretty well. 
Zach Griffen Audio
EvilTone

moley1390

Re: OPA4134UA vs. LM837 as replacement for TL074
« Reply #4 on: June 22, 2012, 01:36:13 AM »
Great, thanks guys. Those were my thoughts as well. I think I'll go with the 4134

usekgb

Re: OPA4134UA vs. LM837 as replacement for TL074
« Reply #5 on: June 22, 2012, 11:53:09 AM »
Just remember that the OPA4134 is not available in a DIP14 format, only surface mount.  You will have to get an adaptor if your existing PCB is DIP.  If it's a new design, no problem.  Also, I believe the OPA4134 uses more current than the TL0 stuff.  If you are replacing a whole bunch of them, make sure your power supply can handle it.

Cheers,
Zach
Zach Griffen Audio
EvilTone

moley1390

Re: OPA4134UA vs. LM837 as replacement for TL074
« Reply #6 on: June 25, 2012, 10:58:09 AM »
Hey all,

How about the OPA4228 (OPA228 family)
I've just had a listen to a 2228 vs. a 2134, and I find the 2228 to be a little more "accurate" in the highs, while the 2134 is quite warm and fluffy (in a good way!).

Application is microphone preamplifier, have to be compatible with TL074 for a mod - Noticed that the 4228 has less current draw...? Datasheet http://www.farnell.com/datasheets/1361030.pdf

It's also more than twice the price of the 4134 - I assume this is because of the increased slew and GBW?

If money was no object, would this be the way to go?

Also, starting a poll!

timshel!

Re: OPA4134UA vs. LM837 as replacement for TL074
« Reply #7 on: June 30, 2012, 01:49:39 PM »
I voted for other... no opinion on the 4134, but 837s like to explode if you sneeze within twenty feet of them. I'd avoid them if at all possible.