separate DC and AC?

Discussion in 'General Electronics Chat' started by fragrance2008, Nov 25, 2009.

  1. fragrance2008

    Thread Starter New Member

    Nov 18, 2009
    22
    0
    how to separate DC and AC with low frequency? here "low frequency", i mean, in 10Hz range. a simple inductor and capacitor seem not the solution.

    it may be a silly question, but i really have no idea right now. can anybody give me some hints? thanks in advance.
     
    Last edited: Nov 25, 2009
  2. Papabravo

    Expert

    Feb 24, 2006
    10,144
    1,791
    A series capacitor will pass AC and block DC
    A series inductor will pass DC and attenuate AC

    I'm not sure if that qualifies as separation. If not you need to refine the question.
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Did you want to reject any AC frequencies below 10Hz?

    If you're talking about something like an audio system, this would do it for a system designed for 4 Ohm impedance:

    [​IMG]

    DC levels would be blocked as well.

    A plot of the filter response is attached; transmission and return loss.
     
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