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Audio amplifier

Discussion in 'Audio' started by Karthik rajagopal, Apr 3, 2017.

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  1. Karthik rajagopal

    Karthik rajagopal

    203
    6
    May 9, 2016
    Hi all,
    Recently I made an audio amplifier circuit using lm 386 IC. It works well. The thing that I noticed while changing the 10 microfarad capacitor across the pins 1 and 8 ( gain pins) with a lower valued capacitor (0.1 micro farad) was an obvious change in the sound. I got all the high pitched tones amplified with a suppressed low pitched tone. Why is there an amplification of a particular tone with regards to capacitance. Can anyone explain this?


    Thanks in advance
     
  2. davenn

    davenn Moderator

    13,497
    1,830
    Sep 5, 2009
    because you have changed the freq response of the audio path in the chip the smaller value capacitor 0.1uF instead of the recommended 10uF
    is producing a high pass filter.

    There is no reason to be using a 0.1uF in that position
     
  3. Karthik rajagopal

    Karthik rajagopal

    203
    6
    May 9, 2016
    What do you mean by frequency response?
     
  4. davenn

    davenn Moderator

    13,497
    1,830
    Sep 5, 2009
  5. Karthik rajagopal

    Karthik rajagopal

    203
    6
    May 9, 2016
    davenn likes this.
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