Preamp using MC33172N instead of OPA2134

[Sh00pus]

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]

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]

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

 

[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.

 

[AudioLapDance]

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



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

 

[Sh00pus]

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

 

[dchisholm]

. . . 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