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Has anyone experienced with these OPamps? LME49990NA and LME49860NA

post #1 of 13
Thread Starter 
Heard lots of praise for LME49720NA, whether be it pair in I/V or 1 in buffer, or even all three, it was said to sound amazing.

Has anyone had experience with the following?

LME49990NA
LME49860NA

I'm still running the JRC stock, kinda wanted to try different opamps, not sure what combination/one to go with. Would love to hear your opinions! biggrin.gif

Edit: Asus Xonar Essence STX, JRC
Edited by Sxcerino - 4/5/12 at 8:37am
post #2 of 13
Well, for what it's worth, I'll have to say I haven't tried those. For many reasons I don't really see the point in swapping op amps in these circuits in general, unless the original choice just doesn't make sense, which generally doesn't happen for commercial products designed by people who know anything.

Just to clarify things, you mention a "JVC stock" so I'm interpreting that you're not designing your own circuit based on these things or building some design? Also, do you mean to say JVC or JRC? JRC is pretty common for audio op amps, since they have some low-priced options with very good performance. What device (sound card?) are you looking at, and which JRC (JVC?) op amp is currently being used?

These LM4xxxx op amps you're talking about have really great performance, anyhow. It's just that in these applications, the original op amps are really not the limiting factor at all, in terms of the electrical performance. The rest of the circuit, stray interference, your headphones, and your ears are going to be a lot more relevant anyway.
post #3 of 13
Thread Starter 
Quote:
Originally Posted by mikeaj View Post

Well, for what it's worth, I'll have to say I haven't tried those. For many reasons I don't really see the point in swapping op amps in these circuits in general, unless the original choice just doesn't make sense, which generally doesn't happen for commercial products designed by people who know anything.
Just to clarify things, you mention a "JVC stock" so I'm interpreting that you're not designing your own circuit based on these things or building some design? Also, do you mean to say JVC or JRC? JRC is pretty common for audio op amps, since they have some low-priced options with very good performance. What device (sound card?) are you looking at, and which JRC (JVC?) op amp is currently being used?
These LM4xxxx op amps you're talking about have really great performance, anyhow. It's just that in these applications, the original op amps are really not the limiting factor at all, in terms of the electrical performance. The rest of the circuit, stray interference, your headphones, and your ears are going to be a lot more relevant anyway.

Oh crap, I forgot to mention that this was for my Xonar Essence STX.

You're correct, I meant JRC, specifically JRC2114 tongue.gif
post #4 of 13
You may find this of interest:

http://brainbit.wordpress.com and the custom unified drivers for the asus sonar stx. This work has been in process for over (4) yrs and is now quite evolved. There is also information on component modding of xonar and titanium cards.

There is nothing offered for sale - only driver downloads and active forum.
post #5 of 13
LME49990NA is good for it's price. I think it was 15 dollars? Can't remember anymore. Messed about with it a few months ago.

Depending on the rest of your hardware the opamps can definitely change the sound.
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post #6 of 13
Thread Starter 
Quote:
Originally Posted by buildtoexcess View Post

You may find this of interest:
http://brainbit.wordpress.com and the custom unified drivers for the asus sonar stx. This work has been in process for over (4) yrs and is now quite evolved. There is also information on component modding of xonar and titanium cards.
There is nothing offered for sale - only driver downloads and active forum.

Yeah I looked into it, unfortunately on the discussion for hardware amp upgrades, there doesn't seem to be a common theme frown.gif
Quote:
Originally Posted by Simca View Post

LME49990NA is good for it's price. I think it was 15 dollars? Can't remember anymore. Messed about with it a few months ago.
Depending on the rest of your hardware the opamps can definitely change the sound.

afaik, LME 49990NA is the sucessor to 49720NA, is that correct? Might just get the 49990 ones if so. Higher the number the better right tongue.gif
post #7 of 13
Thread Starter 
Hmm I could only find LME49990MA on ebay, is that the same?
post #8 of 13
I'm not finding mention of a LME49990NA. It seems to be a typo of LME49990MA. Regardless, the trailing letters are usually not that important; even if there are differences, it's often in things like DC specs that may not matter to your application. Even the starting letters are often not important--different companies can make more or less the same thing.


You just need to make sure to have something that fits in the DIP-8 socket, with the 8 pins sticking downwards. Many devices are only available as SOIC-8, which is a smaller package with the 8 legs perpendicular to the surface, for (automated) surface mount soldering.

Digikey (also Mouser) has these for about $5 each, but they are in a SOIC-8 package, so you'd need to solder them into an adapter for DIP-8.
post #9 of 13
Thread Starter 
I see, so I would need something like these:http://www.ebay.com/itm/2x-LME49990-DIP8-ADAPTERS-/190640593494?pt=LH_DefaultDomain_0&hash=item2c63109a56#ht_938wt_1396

Seems like they're really big on the adapters (compared to their original size); would they fit on an essence STX?
image of xonar STX with default JRCs: https://lh5.googleusercontent.com/-BEqOlgxNqck/TjuO0Igqk0I/AAAAAAAAGhc/EXllNxWM8xM/s1255/EY019212.JPG
Edited by Sxcerino - 4/7/12 at 11:53am
post #10 of 13
That's got to be a weird optical illusion lol. Yes it should fit. It's DIP-8 form factor and pin spacing you're looking for, and that's DIP-8.

You can see the 5532 op amps (U5 and U8) near the bottom are SOIC-8.

With the added height from the adapter, it's still going to be less tall than the electrolytic capacitors to the right, so there's no problem there? Or maybe slightly taller. Anyway, the height doesn't matter unless there's another expansion card in the slot right next to the sound card.

Again, I'd expect 0 audible difference making the switch and maybe not even a difference in measured performance, but feel free to do what you want.
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