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Which of these ICs can be swapped out with the OPA2134?
Which of these ICs can be swapped out with the OPA2134?
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Old 20th July 2021, 10:59 AM   #11
Mark Tillotson is offline Mark Tillotson
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Originally Posted by saabracer23 View Post
So the OPA2134 will not need the decoupling then is what youíre saying?
No, just that this is one of the many things you need to check before substituting opamps - you can't just expect any opamp to work in a particular circuit, you have to read the datasheet carefully (just like any active component).
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Old 20th July 2021, 12:23 PM   #12
kn0ppers is offline kn0ppers  Germany
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Originally Posted by saabracer23 View Post
Out of curiosity, is there a matching single op amp for the 1656? As in for the OPA2134 there is the OPA134.
I think there were plans from TI but I haven't heard anything in a while...
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Old 20th July 2021, 05:50 PM   #13
saabracer23 is offline saabracer23  United States
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Originally Posted by Mark Tillotson View Post
No, just that this is one of the many things you need to check before substituting opamps - you can't just expect any opamp to work in a particular circuit, you have to read the datasheet carefully (just like any active component).
Oh okay, thank you for the clarification.

By looking at the schematic, what devices would benefit from being changed? Should I do all of the LF353N? All of the RC4558P? Should I get some OPA134 for the LF351N?

Dan
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Old 20th July 2021, 07:15 PM   #14
00940 is offline 00940  Belgium
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Originally Posted by saabracer23 View Post
Out of curiosity, is there a matching single op amp for the 1656? As in for the OPA2134 there is the OPA134.
No but you have an OPA1641 which is quite a bit better than the OPA134. As already suggested by Jean-Paul... There is a whole family of opa1641-1642-1644, just as for the opa134.
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Old 21st July 2021, 01:33 PM   #15
saabracer23 is offline saabracer23  United States
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Originally Posted by 00940 View Post
No but you have an OPA1641 which is quite a bit better than the OPA134. As already suggested by Jean-Paul... There is a whole family of opa1641-1642-1644, just as for the opa134.
Okay perfect, thank you.

Dan
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Old 21st July 2021, 01:34 PM   #16
saabracer23 is offline saabracer23  United States
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Is anybody able to look at the schematic at determine what device numbers should be the ones replaced?

Dan
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Old 21st July 2021, 03:29 PM   #17
saabracer23 is offline saabracer23  United States
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Originally Posted by jean-paul View Post
OPA2134 is good ... but it consumes more power than normal (8 to 10 mA per IC) and it is not rail to rail output. OPA1642 is its replacement despite the lower type number. It needs an adapter though.

Easiest is to replace LF351N and LF353N for the OPA134 and OPA2134 just like the shop in Idaho did. To judge things right with the other opamps the schematic is a must.
Iím not certain thatís what the shop did, I couldnít even venture a guess. Do you believe that is likely what they did, are those the ICs you would replace?

Dan
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Old 22nd July 2021, 01:49 PM   #18
Mark Tillotson is offline Mark Tillotson
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Originally Posted by saabracer23 View Post
Is anybody able to look at the schematic at determine what device numbers should be the ones replaced?

Dan
My question again: what performance is currently lacking that you want? Do you have any means to measure it?
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Old 22nd July 2021, 02:04 PM   #19
Kay Pirinha is offline Kay Pirinha  Germany
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Full of conviction I assume the guys at DBX knew very well what they were doing and why they chose the 4558 at which position in their circuitry. Yes, I know of the not-so-good fame of this device. Anyway, there are applications where it simply is hard to outperform it. Last but not least don't forget that we're discussing a FX device here, not a high end reproducer.
Best regards!
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Old 22nd July 2021, 02:05 PM   #20
jean-paul is offline jean-paul  Netherlands
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They likely chose the opamps for their low price as usual. Same reason NJM4580 is found in abundance.
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