Filter, Lowpass, Bandpass or ?

Discussion in 'The Projects Forum' started by nolacagsr, Nov 24, 2009.

  1. nolacagsr

    Thread Starter New Member

    Nov 17, 2009
    7
    0
    I am trying to filter some unwanted noise from a low frequency DC Signal and was wondering the best way to do this. I was thinking of going along the lines of a low pass filter. I am however worried about the gain in the circuit. Any other ideas I am new to the electronics field and was just wondering if anyone out there had ideas or examples out there.
    Thanks in advance.
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    What is the signal? Before we can help we have to have an idea, to keep what is important in the signal before throwing away the rest.
     
  3. bertus

    Administrator

    Apr 5, 2008
    15,646
    2,345
    Hello,

    The type of filter to use depends on the type of wanted signal versus disturbing signal.
    When the disturbing signal lies within the frequency range of intrest a notch filter may be applicable.

    Greetings,
    Bertus
     
  4. nolacagsr

    Thread Starter New Member

    Nov 17, 2009
    7
    0
    I am looking at a DC signal the frequency range is betweeen 10Hz and 20Hz. Low frequency.
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Is the interfering noise below, at, or above that range of frequencies?
     
  6. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    What is the output impedance of your signal source?

    If you don't know that, then please post a schematic of what your signal source is, so that we can figure it out.

    A filter on your signal will cause a phase delay. The lower the cutoff frequency, the worse the phase delay will be.
     
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