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Forum I'm still struggling to apply my limited knowledge of op amps... so I've created a problem to solve... but need your help.
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I'm still struggling to apply my limited knowledge of op amps... so I've created a problem to solve... but need your help.

BigG
BigG over 3 years ago

I can follow along other peoples projects but it quickly becomes apparent that I do not fully grasp the fundamentals when I try and solve a problem of my own.

So here is my own problem I'm trying to solve, as shown below:

image

I have two scenarios. I think the first one is fairly easy, but it is knowing how to achieve the 2nd that is more challenging, especially if you wish to say use the same op amp and even the same circuit the 1st.

How does one go about this?

As per usual, I very quickly try and over-complicate matters... like when spotting these types... Transresistance amplifiers... and wondering whether I should/could use these...

Anyway, no doubt this is a very straightforward problem for the experts.

I look forwards to getting some tips.

Thanks.

C://

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  • beacon_dave
    beacon_dave over 3 years ago +7
    This might be of help ? 'Designing Gain and Offset in Thirty Seconds' https://www.ti.com/lit/an/sloa097/sloa097.pdf
  • scottiebabe
    scottiebabe over 3 years ago +6
    .
  • beacon_dave
    beacon_dave over 3 years ago in reply to fmilburn +4
    More in-depth coverage in this book: Op Amps for Everyone https://www.elsevier.com/books/op-amps-for-everyone/carter/978-0-12-811648-7 The calculators don't appear to be on ti.com anymore but can be…
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  • dougw
    0 dougw over 3 years ago

    Good references. Figure 7 can be modified to use a pot to adjust the offset:

    R1 adjusts the voltage swing, R3 adjusts the offset.

    image

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  • BigG
    0 BigG over 3 years ago in reply to dougw

    Could I use a variable input voltage instead of a fixed input voltage or variable resistor to achieve the right outcome.

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  • BigG
    0 BigG over 3 years ago in reply to dougw

    Could I use a variable input voltage instead of a fixed input voltage or variable resistor to achieve the right outcome.

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