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Op-amp circuit of an electronic card for a turbine flow meter (m3 Counter)

Discussion in 'Troubleshooting and Repair' started by Dadou, Feb 24, 2018.

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  1. Dadou


    Feb 24, 2018
    This circuit is part of an electronic card used as an interface in a flow meter. An inductive sensor which operate without being powered counts the rotations of the turbine; then transmits the signal to the pins 24,pin25 and shield of the circuit (Refer to the picture). The output of the op-amp drives a "Nand" Cmos gate. Note that there are two similar circuits as there are two sensors:eek:ne on the x-axis and the other to the y-axis. Each sensor is connected to a separate circuit similar to the one shown.
    I whould like to know if the circuit is a linear or a non-liear op-amp application and the operation of this circuit?
    Thank you in advance for your time and consideration.

    Attached Files:

  2. duke37


    Jan 9, 2011
    There is no DC connection to the op-amp -input so the output could be anything.
  3. kellys_eye


    Jun 25, 2010
    Yes there is.

    The components at the bottom of the (poorly drawn) schematic are effectively across the op-amp inputs and there is a connection to Vcc through R5
  4. duke37


    Jan 9, 2011
    As I see it, C3 blocks any DC connection.

    D1 and D2 are back to back diodes, presumably to limit the differential voltage across the op-amp input, but they are not connected there.

    Agree with a very poor schematic layout.
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