Voltage Follower with LM386

Discussion in 'General Electronics Chat' started by Cosmin Traicu, Apr 6, 2017.

  1. Cosmin Traicu

    Thread Starter New Member

    Jan 6, 2017
    12
    0
    Hi! I am triyng to make a voltage follower using LM386 ( i did conected the "Inverting input" to the output "Vout"), but the output doesn't look the same as the input. Even then input has 0V the output is about 500mV.

    I would like to mention that "+INPUT" and "-INPUT" doesn't have the same potential.

    Thanks for reading.
     
  2. bertus

    Administrator

    Apr 5, 2008
    19,705
    4,066
    Hello,

    The LM386 is a power amplifier.
    You can not use it in the same way as an opamp.
    Why do you want to use the LM386 as voltage follower?
    There are some power opamps available if you need the higher output current.

    Bertus
     
    Cosmin Traicu likes this.
  3. Cosmin Traicu

    Thread Starter New Member

    Jan 6, 2017
    12
    0

    I tried to use LM386 because i had this one, but i will look for another one.

    Thanks a lot.
     
  4. AnalogKid

    AAC Fanatic!

    Aug 1, 2013
    7,936
    2,241
    What is the signal you are trying to buffer (voltage, frequency)?
    What is the load or downstream circuit you are driving?

    ak
     
    Cosmin Traicu likes this.
  5. Cosmin Traicu

    Thread Starter New Member

    Jan 6, 2017
    12
    0
    I am using a AD7390 ( DAC converter) to drive an MOS gate, but AD7390's output current is too low (1mA). SO i am trying to boost my DAC output current capabilities with an voltage follower.
     
  6. AnalogKid

    AAC Fanatic!

    Aug 1, 2013
    7,936
    2,241
    SO what is the output current you need?

    ak
     
    Cosmin Traicu likes this.
  7. Cosmin Traicu

    Thread Starter New Member

    Jan 6, 2017
    12
    0
    I think 10 mA should be enough for me. Perhaps even slightly lower.
     
  8. dl324

    AAC Fanatic!

    Mar 30, 2015
    8,562
    2,067
    Most/all generic opamps will provide around 20mA.

    Post a schematic so we don't have to guess or play 20 questions.
     
    absf likes this.
Loading...