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741 op-amp

TRElectronics

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

(*steve*)

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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.
 

Alec_t

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It will struggle to produce much of an output at 20kHz without significant distortion.
 
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TRElectronics

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

(*steve*)

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Ok thanks was just trying to make a comparison between its distortion and the distortion of an AD797 which is -120dB at 20KHz

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.
 

Audioguru

Sep 24, 2016
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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.
 

TRElectronics

May 15, 2017
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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.

Ok thanks (*steve*) I should be able to make a good comparison between them
 

TRElectronics

May 15, 2017
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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.

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.
 

Audioguru

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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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