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The Opamp thread - Page 290

post #4336 of 4757

Hi guys i need your experience in opamps.

 

i have a graham slee voyager that i really love.

 

recently i tried opening it up to take a look on the insides.

 

and i saw that it has a AD823AN op-amp which i could roll.

 

is there by any chance any one here has tried changing the op-amp?

 

or is there recommendations?

 

thank you.

post #4337 of 4757
So I've just found out there is a TI distributor pretty near my place. Thinking of stopping by to pick up some nice opamps and DACs from them.

Anything worth looking at, besides the OPA827, LME49710, LME49720 and LME49990? I know the 49710 and 49720 has metal can package. Any other LMExxxxx series that have this type of package?
post #4338 of 4757

don't believe the metal can hype IMO/IME, and OPA1641 should be on the top of your list if you can solder.

post #4339 of 4757
How does the OPA1641 stand against the OPA827? I have a boatload of OPA827s, just curious if there is anything else worth considering...
post #4340 of 4757
Quote:
Quote:
Originally Posted by leeperry View Post

don't believe the metal can hype IMO/IME, and OPA1641 should be on the top of your list if you can solder.

X2

1641 is amazing!
post #4341 of 4757
Quote:
Originally Posted by Lil' Knight View Post

How does the OPA1641 stand against the OPA827?


I really don't like 827(when rolled blindly rolleyes.gif) and just for the record this XMOS based DAC is using OPA1642 as DAC LPF wink_face.gif


Edited by leeperry - 1/11/13 at 9:53am
post #4342 of 4757
Quote:
Originally Posted by Lil' Knight View Post

How does the OPA1641 stand against the OPA827? I have a boatload of OPA827s, just curious if there is anything else worth considering...

 

827 rules, but needs extra bypass caps to shine.

Not as many as in that linked post, though, LOL!
post #4343 of 4757
Quote:
Originally Posted by leeperry View Post


I really don't like 827(when rolled blindly rolleyes.gif ) and just for the record this XMOS based DAC is using OPA1642 as DAC LPF wink_face.gif
That's a nice, little DAC. Love the teflon pcb.

I'll pick up some OPA1641s to see how they perform then. Mainly use these opamps in a super regulators and servos in my headamp though.
post #4344 of 4757
OPA1641 is decent if low quiescent current is a concern; I prefer the sound of OPA827. That said, I think that ADA4627-1 sounds better than both.
post #4345 of 4757
Yet another JFET input opamp... Thanks for the suggestion, gonna order some.

The way AD codename those xxx627xx and xxx637xx make me think they are direct replacement for the 627/637. Not really sure about this though, gonna dig deeper.
post #4346 of 4757

I'd be surprised if they were.

post #4347 of 4757

I think they are targeted at the same markets, intended to compete with the BB parts

 

one of the biggest advantages of the OPA627/37 is the AC CM input impedance linearity, no good measure is shown on standard datasheets so its hard to say if they're really competitive

post #4348 of 4757
Folks a little input please, i have a P4 warbler which i love and im just getting into rolling opamps?

Does anyone know of any fitting guides, or any do's and dont's?

I have ron's topkit on order, along with some OPA627BP

But im also thinking of getting OPA2111AM and OPA1641 to throw into the mix.

Im currently using AD797 with stock buffers and so far im liking the sq improvement, though i do tend to favour a darker presentation.
Edited by Huxley - 1/16/13 at 11:39am
post #4349 of 4757

A bit new to the thread, been lurking for a while though. I recently put 3 OPA1641's in a PPAv2 style amp, seems to work very well in this amp, but i notice a grainy-ness to the upper-mids, anyone else notice this?

 

joe
 

post #4350 of 4757

Maybe it was distortion?

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