filter circuit

Discussion in 'The Projects Forum' started by nasayaya88, Nov 10, 2012.

  1. nasayaya88

    Thread Starter New Member

    Nov 10, 2012
    1
    0
    i want to create filter circuit but i dont know how to do this..
    now i have 1 project SIGNAL CONDITIONING SOIL MOISTURE USING CAPACITANCE SENSOR.
    what should i do is,must create amplifier>buffer>filter>buffer>linearization>display LCD.
    for amplifier,i used non inverting circuit(1k ohm to get unity gain because i want to maintain the input.input at range 1-5 v.)
    my problem is,how should i do to built filtering circuit?...how the calculation must have to show to get the value of resistance & capacitance into the circuit? :confused::confused::confused:plez help me....:cool:
     
  2. ScottWang

    Moderator

    Aug 23, 2012
    4,854
    767
    The below has the formular calculation of OP Amp HPF/LPF .

    You can look the fourth circuit and press [a] on the left side to choose HPF/LPF.

    Active Filters
    OpAmp Low-pass/High-pass Circuits
    http://www.et06.dk/analogue_filters/
     
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