Electronics > Beginners

What's the use of OpAmps?

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tggzzz:

--- Quote from: vk6zgo on April 29, 2019, 02:29:27 am ---Interestingly, "scale of 2" binary dividers ( plain old bi-stables) were made in an almost identical format.
Apparently they used them in tube type computers.

I never saw any "in the flesh", all the TV SPGs used individual 12AT7s or similar.

Some early SPGs used special "black magic"  divide by 5 or 10 stages, but they had to be "babied" to get them to work properly.

--- End quote ---

I have a Tek 184 time mark generator. It uses nuvistor valves for the 10MHz crystal oscillator and multipliers up to 500MHz. It divides the 100ns crystal output down to 5s in divide by two and divide by 5 stages.

Each division is done with three transistors and some discrete components - including some tweakable components to "baby" the stage. The basic principle of operation is that each stage is an analogue divider: the input injects "glugs" of charge onto a capacitor, and when sufficient glugs have been received a pulse is output and the capacitor discharged.

djnz:
Instead of having 20 transistors all over your PCB, you now have a neat little package that has those in silicon, and they are all connected nicely in the tiny little package.

What's not to like?

Wilksey:
If you know what one is and what it can do then you wouldn't be asking the question, but making the presumption that you do not know what it is or what it does then it is a very valid question.

It's easy to say stuff like "why wouldn't you use one" but if you didn't know how they worked then you probably wouldn't?  I know it took me a while to determine what the point of them are, but when you understand it "clicks" into place.

I think most people have answered your original question already, but here is a webpage with a small video that might help:
https://www.allaboutcircuits.com/video-lectures/op-amp-applications/
It tells you the applications for an op-amp.

There are also plenty of websites and videos that go into them.

EEVblog:

--- Quote from: Darkwing on April 27, 2019, 09:51:40 pm ---Well, I don't get it ... I've now read a lot of times about OpAmps, but I don't see the use of them

--- End quote ---

It's in the name, "operational", the opamp can do mathematical operations among all your basic amplifier stuff. They also make it easier to implement active filters and other blocks.

tggzzz:
To give the OP a direct answer to his question, I suggest he looks at the opamp applications in
https://www.analog.com/en/education/education-library/op-amp-applications-handbook.html

That should keep him going and answer his questions.

Op Amp Applications Handbook, Edited by Walt Jung, Published by Newnes/Elsevier, 2005, ISBN-0-7506-7844-5 (Also published as Op Amp Applications, Analog Devices, 2002, ISBN-0-916550-26-5).

This may well be the ultimate op amp book. It is brimming with application circuits, handy design tips, historical perspectives, and in-depth looks at the latest techniques to simplify designs and improve their performance. But this is more than just the last word on applications. A brief but fascinating History section outlines the early development of the feedback amplifier, starting with H. S. Black’s invention of seventy years ago—and provides priceless insights into the application needs, technological developments, and creative personalities that drove the many generations of op-amp designs.

The Op Amp Applications book is available for download:
    Section H: Op Amp History (pdf)
    Section 1: Op Amp Basics (pdf)
    Section 2: Specialty Amplifiers (pdf)
    Section 3: Using Op Amps with Data Converters (pdf)
    Section 4: Sensor Signal Conditioning (pdf)
    Sections 5-1 to 5-4: Analog Filters (pdf)
    Sections 5-5 to 5-8: Analog Filters (pdf)
    Section 6: Signal Amplifiers (pdf)
    Section 7: Hardware and Housekeeping Techniques (pdf)
    Index (pdf)

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