What is wrong with op-amps?

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#3,541
jan.didden said:
Many years ago, I demonstrated the difference between negative and positive feedback with a bike. The test subject was asked to reverse his hands on the handle bars (left hand to right handle and vice versa). That way, the phase of his feedback corrections was changed 180 deg making it pos feedback. He crashed within a few feet. 🙂

However, if you persevere, you can learn to ride this way relatively quickly; your brain needs very little time to internally reverse phase. Really works, I kid you not.

Jan
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Yeah, been there done that, agreed that it is a training/learning process and possible....also takes about 5 seconds.

Dan.
 
#3,542
vacuphile said:
...As a matter of fact, the gyroscopic forces at play are minute. The reason you don't fall off your bike are minute corrections made by steering. The front wheel paints a sine wave over the line drawn by your rear wheel. This is classic feedback.
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This sine wave or otherwise path is indication/manifesttion of feedback system error/delay.
Wheel gyroscopic action introduces interesting feedback/damping function.

Dan.
 
#3,548
scott wurcer said:
An RIAA has three (four sometimes) carefully defined time constants with a transfer function that is well known, expressed for instance in the s domain. It doesn't matter how you make it either it's an RIAA or it's not. The amplitude and phase conform the the RIAA or they don't.
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RIAA is nothing but a trade group that claims to represent the U.S. recording industry.

If you're referring to some standard published by them, please specify the exact document / version.
 
#3,550
vacuphile said:
And tram rails will bring you down, still walking on clutches from a mishap 4 weeks ago 😎

As a matter of fact, the gyroscopic forces at play are minute. The reason you don't fall off your bike are minute corrections made by steering. The front wheel paints a sine wave over the line drawn by your rear wheel. This is classic feedback.
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Oof, sorry to hear. Have had plenty of close calls and bumps and bruises from getting caught in a groove.

Just to clarify your point even further: the steering geometry on the bike has the tire contact patch behind the steering axis, and thus any deviation away from centered will be met with a reactive force trying to center the front wheel.

Another use for DIP opamps: throw a large number of them at a sheet of foam board. Voila, modern art.
 
#3,554
Kirchhoff said:
Do you even understand the difference between "signal analysis" and "system analysis"?

Or are you just trolling through equivocation?
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The real fun starts when you reach the sophistication level where you understand that, with nonlinear systems with memory, Fourier analysis is as useful as feathers on a horse. Then you will get labeled as "Fourier denier"....

This is what you wrote, Frank reincarnate!
 
#3,558
Kirchhoff said:
RIAA is nothing but a trade group that claims to represent the U.S. recording industry.
If you're referring to some standard published by them, please specify the exact document / version.
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Daniel has provided a good link some posts back. See pages 13- 14 for the answer to your ‘question’ (References 1, 2 on page 29)
http://www.analog.com/media/en/training-seminars/design-handbooks/Op-Amp-Applications/Section6.pdf

:cop:
Bell ringing
Being disrespectful toward members who contribute in a meaningful way here, won’t take you far. Neither trolling will.

George
 
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