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Upgrade / replace NE5534AP?

Richard Penrose
Prodigy 30 points
Other Parts Discussed in Thread: OPA1611, OPA1612, PGA2500, INA163, NE5534, OPA627

Hi,

Are there any opamps that would be a better drop in replacement for the NE5534AP chip?

I would like something that offers even lower noise and better general performance to use in a microphone preamplifier for recording.

 

What would you recommend?

  • 0
    Guru 21975 points

    Richard,

    OPA1611 and OPA1612 (dual version) are great for low impedance microphone inputs (500 ohms and lower). The OPA16xx op amp product numbers are specifically designed for high performance audio applications.

    We also have amplifiers intended for pro-type balanced microphone inputs, the INA163 (resistor controlled gain control) and PGA2500 (digitally controlled gain).

    Regards, Bruce.

  • 0 in reply to Bruce Trump
    Prodigy 30 points

    Hi Bruce,

     

    Thanks for the reply. I'll check out the OPA 1611. Should this work well in place of the NE5534? Will there be any oscillation?

    The manufacturer of the preamp I would like to modify recommends the OPA 627 BP or a LT 1357 from Linear Tech?

  • 0 in reply to Richard Penrose
    Guru 21975 points

    Richard,

    The NE5534 is a very old design that often needs external phase compensation components. It often requires knowledge and persuasion to keep it stable. The OPA1611 is internally compensated and is, in general, much easier to use. Its bandwidth, however, is much greater than the NE5534. Depending on the application and cap load, it may behave differently in the circuit.

    Sounds like you may be in a bit over your head making these modifications. Choosing the right op amp for an application can be tricky business. There is no "best audio op amp" that you can drop into a generic application and assure improvement. It all depends on lots of stuff.

    The OPA627 is an outstanding audio op amp but best used in applications with higher source impedance (it is a FET input device). If you have a very low source Z, you are better off with the OPA1611. I would not recommend the LT device. But then my comments would appear biased, wouldn't they?  :)

    Bruce

  • 0 in reply to Bruce Trump
    Prodigy 30 points

    Hi Bruce,

    Thanks for the reply and info. Yes I admit that I am in a bit over my head.

     

    The OPA627 BP has been used and tested in my preamp very successfully over the past few years and has been confirmed by the manufacturer so I know that this would be a safe choice.

    I may try the OPA1611's and see how they work out.