Feedback Resistor values for OPAMP

Discussion in 'General Electronics Chat' started by chersam1176, Feb 11, 2014.

  1. chersam1176

    Thread Starter New Member

    Jan 15, 2014
    4
    0
    Hi Experts,
    Thank for all your support for my previous query.

    I have another one.I am presently constructing an OPAMP circuit.
    I am connecting IC 3130 A to the input of BC 548 Transistor in inverting mode.The Transistor would be connected in Common base configuration. Can any body tell me how to determine the feedback ressistor value for Opamp 3130 A.

    I only want to know what criteria will decide OPAMAP feedback resistor selection particularly if Output of OPAMP is connected to Transistor BC548.

    I want to construct a full circuit with Opamp 3130 A and BC 548. Can you also tell me how to determine the input resitor values for Opamps ,Rin

    Regards
    chersam
     
    Last edited by a moderator: Feb 12, 2014
  2. #12

    Expert

    Nov 30, 2010
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    There is so much information missing, like how do you make a common base inverting stage? How much gain do you want? Is it positive or negative? What is the source of the signal you are amplifying, or at least its impedance? etc.
     
  3. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
    348
    What's the matter, #12. Don't you have one of these?
     
  4. #12

    Expert

    Nov 30, 2010
    16,321
    6,818
    I loaned it to Karnac.:mad:
     
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