Project Help - Design of an op-amp circuit.

Discussion in 'The Projects Forum' started by Ricky Sum, May 6, 2016.

  1. Ricky Sum

    Thread Starter New Member

    May 6, 2016
    13
    0
    Hi Everyone I got a project but I dont understand and also where to start with.

    DESIGN OF AN OP-AMP CIRCUITS


    Given that the pressure sensor produces an output voltage (Vs : sensor output voltage) according to the equation Vs = (P x 0.131 )+ 1.683. This equation can be expressed in
    terms of pressure (P) versus sensor voltage (Vs). ie. P = (Vs - 1.683)/0.131 You are to design the amplifier circuit for this sensor using any combination of
    inverting amplifiers, non-inverting amplifiers, summing amplifiers together with a 1V
    reference voltage source. The two input signals of this circuit are sensor voltage (Vs ) and an 1V reference
    source (Vref ) and the circuit should produce an output voltage (Vo) indicating the pressure (psi) according to the equation Vo = P (psi)
    i.e When P = 0 psi , Vo = 0V and P = 10 psi, Vo = 10V. P = -10 psi, Vo = -10V.
     
  2. Bordodynov

    Active Member

    May 20, 2015
    637
    188
    I decided to have fun.
    See
    Draft287.png
     
    Ricky Sum, frpr666 and wayneh like this.
  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,969
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    What sensor are you using, which op amps, voltage, pressure range?
     
    Last edited: May 7, 2016
  4. Ricky Sum

    Thread Starter New Member

    May 6, 2016
    13
    0
    Normal pressure sensor

    Hi, are this is the step of doing this project.
     
    Last edited by a moderator: May 7, 2016
  5. dannyf

    Well-Known Member

    Sep 13, 2015
    1,775
    360
    It looks like a summer, and a gain stage, at a minimum.

    All you need to do is to break that equation into formats that can be handled by a typical opamp block.
     
  6. Ricky Sum

    Thread Starter New Member

    May 6, 2016
    13
    0
    How can break the equation
     
  7. Ricky Sum

    Thread Starter New Member

    May 6, 2016
    13
    0
    How do you break the equation?
     
  8. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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  9. AlbertHall

    Well-Known Member

    Jun 4, 2014
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    This pressure sensor reads down to -10psi? Given that a vacuum is 0psi, how do you get lower pressure than that?
     
  10. wayneh

    Expert

    Sep 9, 2010
    12,094
    3,033
    The "g" for gauge in psig is often dropped. Endless confusion versus psia, "a" for absolute.
     
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