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Old 4th March 2012, 03:24 PM   #1
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Default OPA2134 replacement

Hello,

I'd like to change the OPA2134 in my Prodigy Cube DAC with some other OPAMP. I'm just casual user and not sure which one can I use. User manual says:
Quote:
Texas Instrument's socket-type and replaceable OPAMP2134 allows user to enjoy user's own sound taste by replacing OPAMP with another.
...Regular OPAMP, DIP8 type, that can be driven by more than +-5V (for 627 series, 8620,8610 series, 5532 series etc.)
Could you post some suitable choices for my Prodigy Cube, please? I've thought about OPA2228...
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Old 8th March 2012, 07:29 PM   #2
zlac is offline zlac  Croatia
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OPA2228 sounds like an alternative try, not much better or worse on paper.
LME49720 and LME49860 do have better characteristics on paper and a lot of people enjoy the transparency so you might also try those.
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Old 8th March 2012, 07:48 PM   #3
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Try LM4562 - is avail in DIP capsule (LME49720 is the same product with newer name).
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Old 9th March 2012, 07:28 AM   #4
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Quote:
Originally Posted by SoNic_real_one View Post
Try LM4562 - is avail in DIP capsule (LME49720 is the same product with newer name).
Ok, I'll give it a try, it's cheap anyway. Another one which I'd like to try is OPA2107. According it's specs, it can work even with 4,5V, so it's covered witch the USB 2.0 specification.
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Old 24th July 2012, 11:12 PM   #5
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I just A/Bed OPA2134 and LME49720 in the input buffer & output stages of a Bozak ISO-X. (TL072 was the original.)

I wasn't expecting to hear any difference but couldn't believe the improvement in clarity with the LME49720 chip. The OPA2134, in this application, was not nearly as striking an improvement.

rs
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Old 24th July 2012, 11:43 PM   #6
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LME49990 on dual DIP adapter.
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Old 25th July 2012, 04:47 AM   #7
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Quote:
Originally Posted by ryansupak View Post
I just A/Bed OPA2134 and LME49720 in the input buffer & output stages of a Bozak ISO-X. (TL072 was the original.)

I wasn't expecting to hear any difference but couldn't believe the improvement in clarity with the LME49720 chip. The OPA2134, in this application, was not nearly as striking an improvement.

rs
When I hear 'striking' improvements I tend to get out the scope just to verify there isn't something 'funny' going on.

G
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Old 25th July 2012, 03:03 PM   #8
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Everything seems OK electronically. In this case, I think the opamp choice was made to give a "forgiving sound" since the unit is intended to be a playable instrument.

Indeed, the original opamp in all its "warmth" (tee hee) was hiding a minor resonant peak in the high midrange that comes out in certain circumstances. So, TL072 might have been chosen as a cover-up in addition to being inexpensive.

rs
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