common mode and differential mode noisy

Discussion in 'General Electronics Chat' started by massi, Mar 16, 2017.

  1. massi

    Thread Starter New Member

    Mar 16, 2017
    10
    0
    Hi,
    using magnetic probe (it's 20 turn coil with a diameter of 2cm) I get much noisy of common and differential mode. To suppress the common mode noisy I used a ferrite ring with the wire twisted around it. To reduce the differential mode noisy what can I do?
    Thanks in advance
    Regards
    Massi
     
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    4,158
    1,125
    Would be nice to see a schematic, or a picture of your project to help you diagnose the problem.

    Differential signal processing should totally remove Common mode noise.

    The differential noise may actually be more common mode noise picked up by your circuit after the difference amp.

    We really need more info about how you are viewing your noise signals, where the signals are in the circuit you built, and what electrical devices are nearby your work space. You may just need shielding. Troubleshooting transient signals by remote conference while blind is not easy or accurate. Help us help you
     
  3. massi

    Thread Starter New Member

    Mar 16, 2017
    10
    0
    Hi I think this sketch synthesize more or less the situation

    upload_2017-3-16_15-36-56.png
     
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