Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Simple amplifier, lm386

  1. Oct 23, 2008 #1
    hi guys,
    i'm doing the testing amplifier for my DIY project,
    and i using LM386 IC, i found that is a lot of noise at the output.
    i saw an example putting a capacitor at the output to reduce the noise, it work!
    the value of capacitor is 47uF. it not work well for other value capacitor.
    But i not sure why behaviors like that? help please...

    Attached Files:

    Last edited: Oct 23, 2008
  2. jcsd
  3. Oct 26, 2008 #2


    User Avatar

    Staff: Mentor

    The LM386 is not an opamp. It is a power amp, and you do not connect feedback around it like it was an opamp. Download the datasheet from National Semiconductor's website to see how it should be used.
  4. Oct 26, 2008 #3
    Needs a zobell (spelling?) network.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook