Spike supression using ferrite bead

Discussion in 'General Electronics Chat' started by jkj123, Nov 5, 2008.

  1. jkj123

    Thread Starter Member

    Nov 5, 2008
    22
    0
    Hi,
    I have a ferrite bead circuit to filter out noises.
    But when I did a worst case test with a tube light On/OFF continuously, I got spikes on CRO which has 20mS duration and around 300mV amplitude.
    I think this is coming from AC mains, because it is 230V/50Hz.

    Can anybody give some idea to suppress this spike.


    Thanks n Regards
    Jaison
    [​IMG][​IMG]
     
  2. theamber

    Active Member

    Jun 13, 2008
    318
    0
    You could use a snubber circuit.
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Why are these artificially-induced spikes significant? What is the function of the circuit that causes problems with the spikes?
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Hi Jaison,
    We can't see the pictures you tried to post.

    Please edit your original post, and click on the "Advanced" button on the bottom.

    Then click on the "Manage Attachment" button, and select the files to upload. Currently, they are in your
    C:\Documents and Settings\Administrator\Local Settings\Temp
    directory.
     
  5. jkj123

    Thread Starter Member

    Nov 5, 2008
    22
    0
    Thanks a lot for your answers.
    I am giving here my circuit diagram and spike waveform observed(AC coupled channels)for your reference as asked by SgtWookie.
    This circuit is connected to the output of an SMPS which has 12V, 2A DC output.
    Again I think it may be possible if I could filter out 50Hz hum, because it is seen from the spike that it is of around 20mSec width.

    (CRO Channel-1 connected to the input and Channel-2 to the output of this circuit).

    Hoping a good solution,
     
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