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Instrumentation Amplifier Breadboard layout

  1. Feb 16, 2014 #1

    Maylis

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    1. The problem statement, all variables and given/known data
    I need to set up a blueprint for my instrumentation amplifier on a breadboard shown on page 5 of the attached document

    2. Relevant equations



    3. 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.
     

    Attached Files:

  2. jcsd
  3. Feb 16, 2014 #2

    gneill

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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.
     
  4. Feb 16, 2014 #3

    Maylis

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    From reading the lab, it doesn't seem to give the op-amp part number
     
  5. Feb 16, 2014 #4

    gneill

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    Perhaps the part number was mentioned in class? Or was used in a previous lab?
     
  6. Feb 16, 2014 #5

    Maylis

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    Perhaps, then it would be the TLC277 which we used in the previous lab
     
  7. Feb 16, 2014 #6

    gneill

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    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.
     
  8. Feb 16, 2014 #7

    Maylis

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  9. Feb 16, 2014 #8

    gneill

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  10. Feb 16, 2014 #9

    Maylis

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    No. I am not comfortable with breadboard layouts, so I am not certain if my set up is the same as the figure.
     
  11. Feb 16, 2014 #10

    gneill

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    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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