What is the bypass means in LM386 amplifier circuit?

Discussion in 'General Electronics Chat' started by dante_clericuzzio, Feb 14, 2017.

  1. dante_clericuzzio

    Thread Starter Member

    Mar 28, 2016
    213
    4
    Can anyone advise what is the BYPASS means in this circuit and how do we connect it? and is it necessary

    LM386.jpg
     
  2. bertus

    Administrator

    Apr 5, 2008
    19,587
    3,997
    Hello,

    The bypass capacitor is there to reduce noise at the input.

    Have a look at the internal schematic where the connection is made:

    LM386_internal_schematic.png

    And to the graphs on the effect of the bypass capacitor:

    LM386_efect_of_bypass_capacitor.png

    Bertus
     
    dante_clericuzzio likes this.
  3. dante_clericuzzio

    Thread Starter Member

    Mar 28, 2016
    213
    4
    Thanks i will try to add the cap and see if the noise goes away currently i am using coupled inductor to reduce noise to the speaker so when it is no sound the noise greatly reduce but i havent try the bypass capacitor.
     
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