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741 op-amp

Discussion in 'Datasheets, Manuals and Component Identification' started by TRElectronics, May 15, 2017.

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  1. TRElectronics

    TRElectronics

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    May 15, 2017
    Need help with some data for a 741 op-amp - can anyone tell me the distortion at 20KHz?
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    There is no simple answer.

    It will depend on the signal level, the gain, the power supply voltage, and a plethora of other factors.

    It is reasonable to say though, that the venerable 741 is by no means low noise or low distortion by today's standards.
     
  3. Alec_t

    Alec_t

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    Jul 7, 2015
    It will struggle to produce much of an output at 20kHz without significant distortion.
     
    Last edited: May 15, 2017
  4. TRElectronics

    TRElectronics

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    May 15, 2017
    Ok thanks was just trying to make a comparison between its distortion and the distortion of an AD797 which is -120dB at 20KHz
     
  5. TRElectronics

    TRElectronics

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    May 15, 2017
    OK trying to get a rough idea of distortion value to compare to AD797
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    There AD797 will blow it out of the water.

    But be careful reading the specs. That -120dB will be for the most favorable set of parameters. For example, unless otherwise specified, it will be for a gain of 1 and it will rise for higher gain.
     
  7. Audioguru

    Audioguru

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    Sep 24, 2016
    A 741 was introduced 49 years ago. It was not intended for hifi audio. It is noisy and with a gain of only 100 its output level drops above only 10kHz. Its poor slew rate causes distortion at high output levels above 10kHz.

    Why do you care about distortion at 20kHz? Are you an audiophool or a bat?
    Can you hear its 40kHz 2nd harmonic or its 60kHz 3rd harmonic?

    I have used TL07x audio opamps for most of my audio career. The OPAx134 is much better.
     
    Harald Kapp likes this.
  8. TRElectronics

    TRElectronics

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    May 15, 2017
    Ok thanks (*steve*) I should be able to make a good comparison between them
     
  9. TRElectronics

    TRElectronics

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    May 15, 2017
    Mate like I said I had a value at 20KHz for an AD797 and was trying to compare not physically going to use them in circuit thank you for the information it is really helpful for my comparison.
     
  10. Audioguru

    Audioguru

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    Sep 24, 2016
    Don't forget to compare their prices. The AD797 is the most expensive opamp I have ever seen. Maybe they make thousands and test them all then throw away (sell them on ebay) most of them that are not absolutely perfect.
     
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