LM833 amplifier project

Discussion in 'The Projects Forum' started by jimmyho08, Nov 5, 2013.

  1. jimmyho08

    Thread Starter New Member

    Oct 7, 2013
    16
    0
    Hi, I am to use a lm833 amplifier to amplify a electret microphone. The problem I've run into is there is some sort of static noise from the lm833 circuit. At first I thought it was the microphone, but I disconnected the microphone and the noise is still heard. I've isolated it down to the lm833 circuit. It seems that the noise gets louder as the gain is set higher, when the circuit has a gain of 1, the noise isn't there, but the volume isn't loud enough. This is with no audio going through the amplifier, just simply the amplifier being powered on. A power supply is being used to power the circuit. Could someone help me out, maybe my values are out of sorts. Here is my schematic.

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  2. bance

    Member

    Aug 11, 2012
    315
    34
    Try a decoupling cap... 100 nanoFarad from pin8 to ground.


    HTH Steve.
     
  3. #12

    Expert

    Nov 30, 2010
    16,355
    6,852
    You might just have to decide the chip is noisy and either change to a different part number or give it a pre-amp.
     
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