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Discussion in 'General Electronics Discussion' started by n00b, Sep 16, 2014.

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  1. n00b

    n00b

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    Sep 3, 2014
    Hey, guys

    The circuit below is a standard buffer amplifier. Vin can be any voltage between 1-10v but i would also like it to increase Vin by an additional 0.5v when an input between 1-10v is applied so that, for example; if a signal Vin is 1v, the signal that will actually be inputted is 1.5v all the way to a signal Vin of 10v which will be 10 + 0.5v = 10.5v.

    IMG_20140916_153246.jpg

    thanks!
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    12,458
    2,986
    Nov 17, 2011
    Look at a difference amplifier (e.g. about half way down this page).
    Vout=(V2-V1)*Rf/Ri
    Set Rf=Ri for a gain of 1.
    Set V2=Vin, V1=-0.5V, therefore V2-V1= Vin+0.5V
     
  3. n00b

    n00b

    11
    0
    Sep 3, 2014
    Sweet, thanks Harald!
     
  4. n00b

    n00b

    11
    0
    Sep 3, 2014
    Is there a simple way to keep Vin @ 0v if Vin<1v?

    thanks~
     
  5. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Do you mean keep Vout=0V for Vin <1V?
     
  6. n00b

    n00b

    11
    0
    Sep 3, 2014
    wops, that's what i meant.
     
  7. Harald Kapp

    Harald Kapp Moderator Moderator

    12,458
    2,986
    Nov 17, 2011
    Have a look at this thread, it deals with a similar problem.
     
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