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Old 4th April 2010, 05:52 AM   #1
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Default NJM4558L replacement

Looking to replace this on a sm pro audio Pr4v. Looking to improve the circuit. Any help much appreciated.
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Old 4th April 2010, 01:32 PM   #2
jethari is offline jethari  India
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You could try the NE5532. I've had pretty good results with those.
Hari
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Old 4th April 2010, 05:43 PM   #3
Mooly is offline Mooly  United Kingdom
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As Hari mentions the 5532 is fine although DC precision is not it's forte and it's a little power hungry (relatively speaking) compared to the 4558. If you are changing several then it's an important point. It also needs care with decoupling too for absolute stability.

IMO you honestly can't go far wrong with the TL072 as a drop in replacement, and as always it would help to see exactly what the intended application is (circuit diagram).
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Old 4th April 2010, 06:30 PM   #4
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Almost anything else would be an improvement
In your application (mike preamp?) I feel that a dual low-noise OpAmp will do. My favorite is LM4562 (it is unity gain stable so no surprises there, doesn't draw a lot of current like other higher-performance parts).
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Old 4th April 2010, 07:27 PM   #5
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4558!! and that crap is in production!
SM Pro Audio: PR4V - 4 Channel Microphone Preamp

Those conductive plastic pots must be the cheapest as well? Ergh..
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Old 4th April 2010, 11:08 PM   #6
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Isn't the marketing a powerfull tool?
Quote:
PR4v is a 4 channel microphone preamplifier specifically designed to enhance the front end of any multitrack digital recording system.
It is always amazing to me how the crappiest parts get in the "pro" or "hi-end" devices.
This days I woldn't use 4558 in a boom-box...
The JRC datasheet says all - it is based on the grandfather 741 OpAmp:
Quote:
Combining the features of the NJM741 with the close parameter matching and tracking of a dual device on a monolithic chip results in unique performance characteristics. Excellent channel separation allows the use of the dual device in single NJM741 operational amplifier applications providing density.

Last edited by SoNic_real_one; 4th April 2010 at 11:14 PM.
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Old 11th April 2010, 04:05 AM   #7
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Quote:
Originally Posted by SoNic_real_one View Post
Almost anything else would be an improvement
In your application (mike preamp?) I feel that a dual low-noise OpAmp will do. My favorite is LM4562 (it is unity gain stable so no surprises there, doesn't draw a lot of current like other higher-performance parts).
That there is fact. The 5532 sounds pretty awful also but not as bad as the generic 4558. Maybe a NJM2068 would work?
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Old 11th April 2010, 04:29 AM   #8
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I've replaced those chips with NJM4580s (same brand as your current NJM4558s) since they are also bipolar input op-amps and they are cheap as well. Try them and you'll notice a big difference and most likely you won't have to modify the existing circuit.

On the other hand you may try space age op-amps as well but I suggest trying those first.

A good idea is to install sockets and try different op-amps, then just go with what your ears tell you.
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Old 11th April 2010, 01:56 PM   #9
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I have tried in my gear NJM2068 and are pretty good too... I just liked (way) better LM4562 in my application (DAC I/V and filtering)
Now, I have LM4562 in all my audio - even where I had SMD OpAmps.
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Last edited by SoNic_real_one; 11th April 2010 at 02:05 PM.
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