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-   -   Preamp using MC33172N instead of OPA2134 (http://www.diyaudio.com/forums/construction-tips/229971-preamp-using-mc33172n-instead-opa2134.html)

Sh00pus 13th February 2013 06:52 PM

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.

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 14th February 2013 01:58 AM

1 Attachment(s)
Quote:

Originally Posted by yajnaS (Post 3368893)
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 :confused:
http://www.ti.com/lit/ds/sbos006/sbos006.pdf

Made for audio
+-24V
drive 600ohm

Attachment 330289

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 (Post 3369084)
. . . 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


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