Electronics > Beginners
Function Generator and OpAmp
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AngraMelo:

--- Quote from: Audioguru on June 11, 2018, 11:42:06 pm ---What are you using an old 741 opamp for? Its design is 50 years old and there are much better opamps available today.

--- End quote ---

Im a beginner, I dont know much about opamps, I chose the 741 because it is so popular and there are lots of experiments and information about it.

Im just trying it out to see if I can make it work correctly.

It is just a study.,

Also, I live in Brazil, we dont have access to all the ICs you guys from north america have.
Besides, even if I get my hands on the new stuff, what is the purpose? If I dont know how it works there is not point.
bd139:
741 is absolutely fine to learn with. No nasty surprises and it’s far from ideal so you can learn about the limitations of opamps easily.
JS:
Here is a list of my conventional opamps to go.

NE5532 and NE5534 (the first dual opamps in dip8, the second is the same thing but single, but it has some caveats, it's faster and it must be slowed down if used at gains under 10dB) All audio related stuff as long as it not super high impedance like instrument input. BJT input devices.

OP27 for precision, low noise applications. BJT input devices.

LM358 for low voltage or single rail applications. BJT input devices.

TL07X (71, 72, 74) are quite common and very useful. Low input current which makes it ideal for high input impedance circuits. JFET input devices.

CA3140 is MOSFET input, low noise and low input current, reasonable fast, good for high impedance low noise applications.

I do have a bunch of LM741 I bought for some reason some time back, when you need an opamp just to work are fine, super stable and reliable. CA1458 is the dual version.

For experimentation, 741 are fine, you can learn a lot from them, the only thing you would be missing when you jump to more modern ones are stability issues, as it's slower it doesn't have those, so, you could call it a feature for your situation. The input offset is high but you can trim it, the noise, well, you won't be learning opamps with low noise applications, those are quite bitchy.

JS
Old Printer:
Thank you all to those who responded with suggestions. My question was a bit tongue in cheek. When someone in a beginners forum criticizes a beginners choices, I would hope they would at least include a few suggestions of what that poster's opinion of a good choice would be. Otherwise it is just criticism for criticism sake.
In Vacuo Veritas:

--- Quote from: bd139 on June 12, 2018, 06:45:04 am ---741 is absolutely fine to learn with. No nasty surprises and it’s far from ideal so you can learn about the limitations of opamps easily.

--- End quote ---

Also less likely to oscillate at 500MHz on a breadboard with 6 inch long wires everywhere.
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