Instrumentation Amplifier Breadboard layout

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Discussion Overview

The discussion revolves around setting up a breadboard layout for an instrumentation amplifier, specifically addressing the configuration of op-amps and connections as outlined in a provided document. Participants are exploring the practical aspects of implementing the circuit design, including component identification and layout strategies.

Discussion Character

  • Homework-related
  • Technical explanation
  • Exploratory

Main Points Raised

  • One participant expresses uncertainty about how two op-amp chips can provide three op-amps for the instrumentation amplifier and questions the connection of grounds.
  • Another participant suggests that the op-amps might be dual chips, prompting a look-up of the part numbers and their specifications.
  • There is a discussion about the absence of the op-amp part number in the lab instructions, with a suggestion that it may have been mentioned in class or previous labs.
  • A specific part number, TLC277, is proposed as a likely candidate based on previous usage, with an emphasis on checking the data sheet for pinout information.
  • One participant indicates discomfort with breadboard layouts and uncertainty about matching their setup with the provided figure.
  • A suggestion is made to use the two op-amps from the first chip for the first two op-amps and one from the second chip for the third, highlighting flexibility in arrangement and the importance of keeping a diagram of the chip pinout handy.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the exact configuration or layout for the instrumentation amplifier, as there are varying levels of comfort and understanding regarding breadboard setups and component arrangements.

Contextual Notes

Participants express uncertainty about specific connections and configurations, indicating a reliance on external documents and prior knowledge that may not be fully detailed in the current lab instructions.

gfd43tg
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Homework Statement


I need to set up a blueprint for my instrumentation amplifier on a breadboard shown on page 5 of the attached document

Homework Equations


The Attempt at a Solution



I'm not sure how 2 op-amp chips will make 3 op-amps for the instrumentation amplifier. I'm also not sure how the figure on page 2 comes into play when creating the circuit on page 4. I don;t know where to attach grounds

here is what I have drawn so far for my amplifier circuit, I don't know where R4 should connect if there are only 2 omp amps and the diagram has 3.
 

Attachments

  • Lab+4+Instrumentation+Amplifier+3.1.pdf
    Lab+4+Instrumentation+Amplifier+3.1.pdf
    553.7 KB · Views: 829
  • Instrumentation Amplifier Diagram attempt 1.png
    Instrumentation Amplifier Diagram attempt 1.png
    17.4 KB · Views: 914
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Do you have the part numbers of the chips that will be used? It could very well be that they are dual op-amp chips, each containing two op-amps. If you have part numbers, go online and look up their spec sheets for the pinout.
 
From reading the lab, it doesn't seem to give the op-amp part number
 
Maylis said:
From reading the lab, it doesn't seem to give the op-amp part number

Perhaps the part number was mentioned in class? Or was used in a previous lab?
 
Perhaps, then it would be the TLC277 which we used in the previous lab
 
Maylis said:
Perhaps, then it would be the TLC277 which we used in the previous lab

Well, the TLC277 would fit the bill: Each chip has two op-amps. It's likely that you'll be using the same chip as previously used unless otherwise instructed. I would assume that you have its data sheet for the pinout? If not, it can be easily found on the web.
 
No. I am not comfortable with breadboard layouts, so I am not certain if my set up is the same as the figure.
 
  • #10
You might want to use the two op-amps in the first chip for op-amps 1 and 2. Then use one op-amp from the second chip for op-amp 3. You have a certain amount of flexibility in how you arrange the parts. Some people plug all the parts into slots in some orderly fashion and then run jumpers to connect things. Others use the leads of the parts themselves and plug the components from point to point. Some mix and match.

It's good to keep a diagram of the chip pinout handy, and to assign buses for the -Vdd, +Vdd, and GND rails first.
 

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