What does this opamp configuration do?

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Discussion Overview

The discussion revolves around identifying the function of a specific operational amplifier (op-amp) configuration. Participants explore the circuit's behavior, including waveforms observed at different nodes, and attempt to classify the circuit type, focusing on its theoretical and practical implications.

Discussion Character

  • Exploratory, Technical explanation, Homework-related

Main Points Raised

  • One participant suggests that the circuit with a capacitor resembles an integrator and describes the waveforms observed at various nodes.
  • Another participant hints at a term starting with "O" related to a family of systems, implying a connection to oscillatory behavior.
  • A subsequent reply proposes that the circuit might be an oscillator, specifically mentioning terms like "Triangle Wave Oscillator," "Hysteretic Oscillator," or "Relaxation Oscillator."
  • Further clarification is provided that the right-hand op-amp acts as an inverting integrator, while the left-hand op-amp functions as a comparator with hysteresis, producing a constant output.
  • One participant expresses appreciation for the explanation provided, indicating a positive reception of the information shared.

Areas of Agreement / Disagreement

Participants appear to converge on the idea that the circuit functions as some type of oscillator, though specific terminology and classifications remain open to interpretation and discussion.

Contextual Notes

The discussion includes assumptions about the circuit's configuration and behavior, as well as references to external resources for further exploration of the topic.

Who May Find This Useful

Individuals interested in operational amplifier circuits, waveform analysis, and oscillator design may find this discussion relevant.

dla
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Homework Statement


Trying to figure out what this opamp does but can't pinpoint it.

Homework Equations


The Attempt at a Solution


The one with the capacitor looks like an integrator. I attempted to build this circuit to see what it does. At node B I saw a triangle repeating waveform, node A gives a square oscillating waveform and C is some sort of horizontally flipped RC curve which can been seen with the file I attached. Anyone have any idea the name of this circuit?
 

Attachments

  • 555RCcurveGraph.jpg
    555RCcurveGraph.jpg
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  • lab1.JPG
    lab1.JPG
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Last edited:
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Hint: The word you are looking for begins with an "O" and is used to describe a family of systems including a pendulum.
 
I'm still quite not sure.. The only thing that comes to mind is an oscillator?
 
Oscillator will do :-)

I suppose "Triangle Wave Oscillator" or "Hysteretic Oscillator" or "Relaxation Oscillator" might get you another half mark.

The right hand op-amp is indeed an inverting integrator. It integrates the "constant" output of the left hand op-amp.

The left hand op-amp is configured as a comparator (with hysteresis) and it's output is a "constant" VCC or -VCC.

You can actually make one by merging the functions each op-amp performs into one op-amp. See wikipedia for that..

http://en.wikipedia.org/wiki/Relaxa...2.80.93based_electronic_relaxation_oscillator
 
Perfect explanation, thank you!
 

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