Help selecting a linear gain op amp (20-20Khz) for a portable device

Discussion in 'The Projects Forum' started by arenwi, Apr 21, 2015.

  1. arenwi

    Thread Starter Member

    Dec 29, 2014
    Hi to every body,

    Im´m working on a new project, I need to amplificate the output signal of a sensor.
    I have asembled a lot of different amplifier configuration but I ´didnt find the correct configuration I think that the problem is the op amp taht i had used (op270, tlv 2262 ...).

    This is what I need:

    an op amp with linear amplification betwin 10 hz to 20khz (the sensor is an electret microphone)
    Vcc must be like 0-5v or something like this. It will be a portable device, and I can´t work with negative Vcc.

    many thanks for your help

  2. #12


    Nov 30, 2010
    GBW = 6Million
    Slew rate 1.7 V/uS
    SR = 2 Pi Vp F
    Vp =< 2.5 volts
    Your limit with the OP270 is 108 KHz.
    You are barking at the wrong tree.
    Can you post a schematic of what did not work?
    Then maybe I can figure out why.
  3. arenwi

    Thread Starter Member

    Dec 29, 2014
    Thank you very much #12 as you told I have enaf leneality woth all of this op amps, I was wrong interpretation of the data sheets.

    Many thanks