Op-amp Replacement for 4580 (JRC) - diyAudio
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Old 23rd January 2009, 04:36 PM   #1
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Default Op-amp Replacement for 4580 (JRC)

Hey all -

I've just taken my first step into the much larger world of audiophilia (not a very attractive name, really) by purchasing a nice sound card for my computer - it's an HT Omega Claro Halo.

The documentation says that it is meant to have the op-amps switched out as the stock ones are low-end, but of course I'm pretty lost in this situation.

It says the current ones are 4580 (JRC) - which ones can I even look at that would replace that one?

And I know it's all subjective, but can anyone recommend a good one that would work in this implementation?

Thanks a lot!
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Old 23rd January 2009, 06:36 PM   #2
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4580 is generic audio dual opamp (see NJM4580 for datasheet). Aside from working at very low voltages (+/- 2V ?) there is nothing special here. For better relacement see LME49720 (National Semiconductor).LME49720
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Old 24th January 2009, 02:15 AM   #3
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Other options are:

TI # OPA2134
TI # NE5532
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Old 24th January 2009, 03:00 AM   #4
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Are the current opamps DIP-8 or surface mount?

What voltage is available at the power pins of the opamps?
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Old 24th January 2009, 03:18 AM   #5
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someone know where can i get performace comparation of diferents OPamps?
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Old 24th January 2009, 04:39 PM   #6
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Quote:
Originally posted by samsagaz
someone know where can i get performace comparation of diferents OPamps?
What requirements are you looking for in an op-amp?
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Old 24th January 2009, 06:20 PM   #7
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Hmmm, I'm not sure what the difference between DIP-8 and surface mount is. I know that they're designed specifically to be popped in and out for experimentation, so I won't need to wrestle with getting them in and out. They look like all the schematics, but unfortunately that probably doesn't help you

Again, I'm not sure about the voltage, but it's a PCI card so I believe it's max voltage would be about 5v - that would jive with the current op-amps and their low voltages.

How would these things affect my choices? What should I be looking for?

The best part about it is the support for the card is really great, so once I get a few op-amps I'm thinking about I can e-mail them to make sure they're compatible.
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Old 26th January 2009, 10:08 PM   #8
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OK, socketed means they're DIP-8.

Well, at +/- 2.5V, or a single ended 5V, depending on how it's set up, I'd be looking at Analogue Devices AD823.

If you're up to soldering surface mount chips to adaptors (if you're unsure, that's a no, but maybe you know some-one who can) also consider AD8066.

You could also try LM4562 (same chip as LME49720 as recommended below). It's only just barely rated for +/- 2.5V operation, but it's a very good chip.
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Old 27th January 2009, 03:37 PM   #9
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Well awesome! Thanks so much for all the replies.

It looks like I've got a good list of options. Now can anyone tell me where I can read about the sonic qualities of the different chips? If it is all subjective, is there any way to know which one I would prefer without purchasing them?

Thanks again!
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Old 27th January 2009, 04:17 PM   #10
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Quote:
Originally posted by TheSeekerr
OK, socketed means they're DIP-8.
They indeed are DIP-8 in sockets.
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