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The Opamp thread - Page 3

post #31 of 4417
7/7/09 at 9:39am
Guys, I need some help because I just can't find any good info on the matter at hand..
I'm looking for a detaild, yet warm single channel SOIC opamp. It's for my Corda Move.
I had the AD8610's installed, then I replaced them with the LME49710's.
It is a serious upgrade in SQ, but a bit too cold for my taste.

Any recommendations?
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post #32 of 4417
7/7/09 at 9:52am
I'd go with AD744's (OBCA) or the AD843's.

Knowing you Sam, I think you would get a kick out of making up the OBCA adapters for the 744's.
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post #33 of 4417
7/7/09 at 10:14am
Quote:
Originally Posted by Bonthouse View Post
Guys, I need some help because I just can't find any good info on the matter at hand..
I'm looking for a detaild, yet warm single channel SOIC opamp. It's for my Corda Move.
I had the AD8610's installed, then I replaced them with the LME49710's.
It is a serious upgrade in SQ, but a bit too cold for my taste.

Any recommendations?
Try the OPA228UA, if the gain of the circuit is about 5 or more (or if it has a gain setting and you don't mind keeping it high). I think it has what you want.
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post #34 of 4417
7/7/09 at 10:16am
Quote:
Originally Posted by SpudHarris View Post
I'd go with AD744's (OBCA) or the AD843's.

Knowing you Sam, I think you would get a kick out of making up the OBCA adapters for the 744's.
Err sorry... The AD744 (especially if you bypass its output stage) surely can't drive headphones and the AD843 doesn't exist SOIC.
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post #35 of 4417
7/7/09 at 10:33am
Er sorry...... but I'm using them in my P3+ driving headphones. I didn't pay too much attention to the SOIC in Sam's post as I did not understand why it would need to be SOIC? Doesn't the move use DIP sockets?

Do you actually have the AD744's or are all your OpAmps Linear Technology?? we can all read data sheets but I like to hear them so don't comment unless I've actually used them.
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post #36 of 4417
7/7/09 at 10:35am
My CD player (an Ayre CX7e) uses the AD844's. Don't know if they can drive headphones either, but they do sound warm and inviting with plenty of detail. The music just flows. Very analogue like presentation with kick ass bass extension and drive.

Bob
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post #37 of 4417
7/7/09 at 10:35am
Quote:
Originally Posted by SpudHarris View Post
Er sorry...... but I'm using them in my P3+ driving headphones. I didn't pay too much attention to the SOIC in Sam's post as I did not understand why it would need to be SOIC? Doesn't the move use DIP sockets?

Do you actually have the AD744's or are all your OpAmps Linear Technology?? we can all read data sheets but I like to hear them so don't comment unless I've actually used them.
You're using them in your P3+ because there's a buffer in between the opamp and the headphones...

(though the AD843 would drive them well also alone)



And yep the Move uses SOIC opamps because the AD8610 only exists as SOIC.
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post #38 of 4417
7/7/09 at 10:39am
You don't say...... but the SOIC's are on a DIP adapter No?
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post #39 of 4417
7/7/09 at 10:39am
Nope, this is the room I have to play with

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post #40 of 4417
7/7/09 at 10:42am
Got ya, my bad, thanks Sam.....Understand why SOIC. Not the sort of job you want to be doing often though. Also forget about the adapters, the ones I make are on DIP sockets also.
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post #41 of 4417
7/7/09 at 10:46am
Very true. But with enough flux, a 225 degrees celsius soldering tip and a steady hand it's possible to do it enough times.
But lets say I want to improve the bass just a little, but keep this opamp. Would different signal caps do the trick? I currently have 3 Elna Cerafine 10v 220uF's installed.
Would replacing them with Elna Silmic II's change the sound enough?
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post #42 of 4417
7/7/09 at 10:47am
Quote:
Originally Posted by BobMcN View Post
My CD player (an Ayre CX7e) uses the AD844's. Don't know if they can drive headphones either, but they do sound warm and inviting with plenty of detail. The music just flows. Very analogue like presentation with kick ass bass extension and drive.

Bob
Thanks for the information. That is potentially interesting for a CMOY that supports bipolar opamps (such as mine ), except that it isn't clear if it's stable or not with any gain of less than +10. While it's specified as stable with G= -1 or more. Perhaps I'll try it if I can find it.

However, it doesn't seem to exist as SOIC, either. So not for the Corda Move.
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post #43 of 4417
7/7/09 at 10:50am
Quote:
Originally Posted by Bonthouse View Post
Very true. But with enough flux, a 225 degrees celsius soldering tip and a steady hand it's possible to do it enough times.
But lets say I want to improve the bass just a little, but keep this opamp. Would different signal caps do the trick? I currently have 3 Elna Cerafine 10v 220uF's installed.
Would replacing them with Elna Silmic II's change the sound enough?
Hmm, not quite sure but I don't think you can change the balance much by just changing the reservoir caps. It would be a different thing if they weren't there at all originally.

I would change the opamps with OPA228UA's. But since that's always a risk with SMD opamps... be it your choice entirely.
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post #44 of 4417
7/8/09 at 1:25am
Thread Starter 
What are some favorite opamps for I/V?
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post #45 of 4417
7/8/09 at 2:55am
Really should state the PURPOSE of the opamp you are recommending.

I/V - I've heard great things of the OPA1632 for I/V - TwistedPearAudio uses it and I must admit, I love their stuff.

Driving headphones directly - AD8397 is pretty damn good and rail-rail. AD825 is really good for that as well, but it doesn't swing rail-rail and runs nicer from 12V+.

Behind a buffer, I like AD825, AD8065, LME49710 among with a few others.
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