TL072ACP and NE5532AN- Anything better out there?

[MaxBiela]

Hi,

I have a digital Cinema-Processor that is kind of noisy. It uses a TL072ACP after D/A for output and a NE5532AN before A/D for input. I think the D/A and A/D is just fine, CS5336 and CS4328. But is there anything better out there as a direct replacement for these OP amps? I've looked up for older Threats, but found nothing regarding the noise of these OPs...

Thanks a lot,

Max Biela

[richie00boy]

The NE5532 is a pretty quiet chip. Maybe you could try the AD8620.

[Nigel Goodwin]

I don't see as replacing the opamps would make any difference?, they are both excellent ones and (presumably?) are running at high signal levels, so noise from the opamps isn't likely to be a problem. I would suggest it's more probably a function of the digital processing?.

[sagarverma]

opa2134 series is a good alternative.replace tl072 with opa.ne is a good chip.tl0 is avg.

[richie00boy]

Originally posted by Nigel Goodwin
I don't see as replacing the opamps would make any difference?, they are both excellent ones and (presumably?) are running at high signal levels, so noise from the opamps isn't likely to be a problem. I would suggest it's more probably a function of the digital processing?.

That's what I was thinking too.

[Leolabs]

Or maybe the PSU problem.

[ashok]

What is the reason why the NE5534 and 5532 sound ( supposedly) inferior to the newer gen chips like OPA2134, AD826 etc.
Yes it is slower , has more distortion etc.

Is it possible to add external circuitry that could possibly improve its performance ? Additional input stage , lighter load by using a buffer and classA biasing ...anything ?
Or is the core so messed up that nothing else will work.
Cheers.

[Jay]

Althou opamps have noise figures, I don't think they are critical to ears. It could be from higher amplification stage. Circuit that comes with TL072/TL082/NE5532 usually comes with cheap capacitors. Circuits like this always have some caps in the signal path. Changing to more expensive opamp without changing the cap in the signal path is usually less preferable than keeping the cheap opamp while upgrading the cap in the signal path

[Ouroboros]

The 5532 and 5534 can still hold their own in comparison with more recent op-amps, provided that they are used correctly. They have poor dc performance and quite high input currents, so they should only be used in low-impedance circuitry. Provided that their limits are understood, the audio performance is very high.

[tschrama]

What is the reason why the NE5534 and 5532 sound ( supposedly) inferior to the newer gen chips like OPA2134, AD826 etc.

NE5534 is not slower and does not have higher THD than opa134, it's a opamp with marvelous performance and highly underestimated....in all my circuit's it's on par with opa627, and better than opa227, opa134, lt1007, easier to wotk with than and more economical than AD797, opa637..