• Register
  • Login
  • This audio noise filter circuit is a bandpass filter for audio frequency band. It filters unwanted signals that are lower or higher than the audio frequencies.
    It has 2 filters: a low pass filter and a high pass filter in a cascade configuration.
    Both filters are second-order filters with a 24 dB/octave fiter capability. The 3 dB cut-off freq. are 11.8 Hz and 10.7 kHz.

    The bandpass characteristic can be changed by changing the values of the capacitors and resistors. If you want to raise the bottom cut-off freq., you must reduce the values of C1 up to C4. For lowering the bottom cut-off freq. you must increase the values.

    If you want to reduce the top cut-off f you must raise the values of R5 up to R8 and decrease it in order to increase the top cut-off frequency.

    Noise Filter circuit diagram

    noise filter diagram

    Audio Noise Filter Parts List

    R1 = R2 = 56kΩ
    R3 = 39kΩ
    R4 = 100kΩ
    R5 = R6 = R7 = R8 = 3.3kΩ
    C1 = C2 = C3 = C4 = 0.33µF ceramic
    C5 = C6 = 0.0033µF ceramic
    C7 = 0.0047µF ceramic
    C8 = 0.0018µF ceramic
    IC1 = IC2 = NE5532N

    
    subscribe to newsletter

    5 Responses to "Audio Noise Filter Circuit"

    1. FENIX FROM DESERT says: on June 23, 2012 at 7:28 am

      Não entendi nada.
      Poderiam me explicar algo mais simples por exemplo um filtro com elementos passivos.

    2. hiba nadeem says: on November 12, 2012 at 5:58 pm

      i want digital filter

    3. hiba nadeem says: on November 12, 2012 at 5:59 pm

      i want to add digital filter in this circuit

    4. i want full report of the audio noise filter circuit please send to my mail ID…

    5. GOKULA RAMANAN says: on February 6, 2014 at 12:26 pm

      DO THIS CIRCUIT IN SOFTWARE SIMULATION?

    What do you think about this article? Leave a comment!

    You may add a picture too