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Old 4th March 2003, 12:01 PM   #1
pundip is offline pundip  Australia
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Default Best Power op amp

I am currently undecided on which power op amp to use in my amp. I am looking at lm3886, lm3875, OPA 549, I have a couple of opa541's but I have seen no info regarding its use in audio. From a purely construction point of view I would like to use the TO-3 packs. I would appreciate any comments on the which power op amp is most suitable, and any specific info on the opa541 and its use in audio. I have +-35v unloaded supply @6A and a 2u rack case.
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Old 4th March 2003, 12:09 PM   #2
audioPT is offline audioPT  Portugal
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Hi!

2U case can held a good heatsink.
Why don´t you try the LM12?
You can bridge two of them and have about 160W with your PSU. Be carefull with the high temperature they can go!!
Don't be afraid, it turns off automaticaly if it gets very hot!

I like the LM3886, it has a good sound quality.

About the opa541, the TO3 - OPA541SM is better. It can go to more than 100ºC without blow up.
In audio applications, it has some THD. If you are using it as a subwoofer amplifier, it's ok.

Pedro Martins
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Old 4th March 2003, 12:18 PM   #3
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You could also check Apex but I think they are a little bit expensive.
http://www.apexmicrotech.com/
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Old 4th March 2003, 12:32 PM   #4
Mad_K is offline Mad_K  Norway
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Have you searched?

http://diyaudio.com/forums/showthrea...ghlight=opa541
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Old 4th March 2003, 03:16 PM   #5
pundip is offline pundip  Australia
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Quote:
Originally posted by audioPT
Hi!

2U case can held a good heatsink.
Why don´t you try the LM12?
You can bridge two of them and have about 160W with your PSU. Be carefull with the high temperature they can go!!
Don't be afraid, it turns off automaticaly if it gets very hot!

I like the LM3886, it has a good sound quality.

About the opa541, the TO3 - OPA541SM is better. It can go to more than 100ºC without blow up.
In audio applications, it has some THD. If you are using it as a subwoofer amplifier, it's ok.

Pedro Martins
I have considered LM12 but I cannot affoard it and its pretty hard to come by in ireland. Unless NSC has started doing samples on it again. I am leaning towards the lm3886. Unless there is something better out there. I would also like to hear from someone who has build a working opa541.
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Old 4th March 2003, 04:30 PM   #6
audioPT is offline audioPT  Portugal
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Quote:
Originally posted by pundip


I have considered LM12 but I cannot affoard it and its pretty hard to come by in ireland. Unless NSC has started doing samples on it again. I am leaning towards the lm3886. Unless there is something better out there. I would also like to hear from someone who has build a working opa541.

Yes, you are right.
In portugal a LM12 costs about 50€

So, try the LM3886. it's cheaper and have goos results.
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Old 4th March 2003, 05:35 PM   #7
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Anyone compared the ST’s TDA7293 and it's sister TDA7294 with a LM3875 by listening? I am considering the TDA7293 for a sub because it looks it can supply more current into a complex load.


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Old 4th March 2003, 05:40 PM   #8
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http://www.apexmicrotech.com/product...amps/pa16.html
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Old 6th March 2003, 07:28 PM   #9
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Default Power OpAmps in Class A???

Just though about this...

I have heard of forcing regular opamps into Class A output by tieing a resistor or CCS to + or -.

Can this be done with a power opamp output stage?

Of course limited by internal heat dissapation....

TXS!
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Old 7th March 2003, 08:01 AM   #10
argo is offline argo  Estonia
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Quote:
Originally posted by Pjotr
Anyone compared the ST’s TDA7293 and it's sister TDA7294 with a LM3875 by listening? I am considering the TDA7293 for a sub because it looks it can supply more current into a complex load.



For sub - go with either TDA
For an example Hypex http://www.hypex.nl/ HS80 sub amp uses single TDA7294
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