Preamp using MC33172N instead of OPA2134

Sh00pus · 13th February 2013, 06:52 PM

I wanted to put a preamp in my amplifier and stumbled upon the High Quialty Preamp on this page.

But it uses the OPA2134 and the problem is that my amplifier uses a +/- 20V power supply. I was wondering if I could replace the OPA2134 with the MC33172N because this op amp can run on +/-20V.

dchisholm · 13th February 2013, 08:55 PM

The MC33172 may tolerate higher supply voltages but the Data Sheet specs are inferior to the OPA2134 in the areas that matter to audio. You can probably find a high-performance audio opamp that is rated for +/-22V supplies, but I'd look into regulating your +/-20V rails down to a lower voltage.

Dale

Sh00pus · 13th February 2013, 10:25 PM

Should I just connect a positive and negative voltage regulator to the supply lines and then run those to the op amp?

yajnaS · 13th February 2013, 10:28 PM

This is very bad advice, BUT... In my experience, Ti's products are very conservatively rated. The OPA2134 is rated up to +-18V, I'm pretty sure it will work fine at 20V.

AudioLapDance · 02:03 AM

Quote:

Originally Posted by yajnaS

This is very bad advice, BUT... In my experience, Ti's products are very conservatively rated. The OPA2134 is rated up to +-18V, I'm pretty sure it will work fine at 20V.

EEeeek! Make sure you have some spares!

Can't believe no one mentions OPA2604

http://www.ti.com/lit/ds/sbos006/sbos006.pdf

Made for audio
+-24V
drive 600ohm

opa604 2604 sound quality.png

from
http://www.ti.com/lit/ds/symlink/opa604.pdf

Sh00pus · 14th February 2013, 02:05 AM

Wow thats almost perfectly the same! Thanks, I think I'll use that instead so I don't have to buy voltage regulators

dchisholm · 14th February 2013, 05:56 PM

Quote:

Originally Posted by AudioLapDance

. . . Can't believe no one mentions OPA2604

A very good choice! I knew there were some suitable parts out there but I was too lazy to wade through several selection guides when I suggested regulating the supply rails down to lower voltages. I think there are one or two "high-voltage" parts in the (formerly) National LMExxxx series, and I believe the time-tested NE5534/NE5532 can live with +/-20V supplies. And, they are cheap and easy to get!

Dale

13th February 2013, 06:52 PM	#1
Sh00pus diyAudio Member Join Date: Mar 2011	Preamp using MC33172N instead of OPA2134 I wanted to put a preamp in my amplifier and stumbled upon the High Quialty Preamp on this page. But it uses the OPA2134 and the problem is that my amplifier uses a +/- 20V power supply. I was wondering if I could replace the OPA2134 with the MC33172N because this op amp can run on +/-20V.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Can i make a balanced preamp only using OPA2134 ?	PuccioQM	Analog Line Level	17	8th November 2012 07:36 PM
Class A LM4562 (or OPA2134) preamp layout with groundplane	Groundloops	Solid State	11	27th February 2008 09:53 AM
OPA2134 with BUF634 preamp	mnaglik	Chip Amps	12	26th December 2005 01:16 AM
Preamp - Massive DC Offset (OPA2134)	DrSplodge	Chip Amps	21	10th January 2004 11:49 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

13th February 2013, 08:55 PM	#2
dchisholm diyAudio Member Join Date: Mar 2011 Location: St Louis, Mo	The MC33172 may tolerate higher supply voltages but the Data Sheet specs are inferior to the OPA2134 in the areas that matter to audio. You can probably find a high-performance audio opamp that is rated for +/-22V supplies, but I'd look into regulating your +/-20V rails down to a lower voltage. Dale

13th February 2013, 10:25 PM	#3
Sh00pus diyAudio Member Join Date: Mar 2011	Should I just connect a positive and negative voltage regulator to the supply lines and then run those to the op amp?

13th February 2013, 10:28 PM	#4
yajnaS diyAudio Member Join Date: Jan 2011	This is very bad advice, BUT... In my experience, Ti's products are very conservatively rated. The OPA2134 is rated up to +-18V, I'm pretty sure it will work fine at 20V.

14th February 2013, 02:05 AM	#6
Sh00pus diyAudio Member Join Date: Mar 2011	Wow thats almost perfectly the same! Thanks, I think I'll use that instead so I don't have to buy voltage regulators