Preamp using MC33172N instead of OPA2134 - diyAudio
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Old 13th February 2013, 06:52 PM   #1
Sh00pus is offline Sh00pus  United States
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Lightbulb 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.
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Old 13th February 2013, 08:55 PM   #2
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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
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Old 13th February 2013, 10:25 PM   #3
Sh00pus is offline Sh00pus  United States
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Should I just connect a positive and negative voltage regulator to the supply lines and then run those to the op amp?
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Old 13th February 2013, 10:28 PM   #4
yajnaS is offline yajnaS  India
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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.
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Old 14th February 2013, 01:58 AM   #5
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Quote:
Originally Posted by yajnaS View Post
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

Last edited by AudioLapDance; 14th February 2013 at 02:03 AM.
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Old 14th February 2013, 02:05 AM   #6
Sh00pus is offline Sh00pus  United States
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Wow thats almost perfectly the same! Thanks, I think I'll use that instead so I don't have to buy voltage regulators
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Old 14th February 2013, 05:56 PM   #7
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Quote:
Originally Posted by AudioLapDance View Post
. . . 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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