Help with circuit components

Discussion in 'Electronics Resources' started by Ali250, Aug 6, 2014.

  1. Ali250

    Thread Starter New Member

    Aug 6, 2014
    I'm trying to interface an RJ-45 connector with a standalone ENC28J60 ethernet controller IC and the manufacturer provided the attached circuit diagram in the datasheet.

    I've encircled the bits I need some help with. Firstly the symbol at the bottom is something I've never seen before. I'm guessing it's something similar to a ground but I'm not quite sure? Secondly what's the use of the 1:1 current transformers? Can I simply omit them since they aren't altering the current or voltage in anyway? Or are they a safety precaution to physically isolate the RJ-45 connector from the ethernet controller?

    Thanks in advance.
  2. mitko89


    Sep 20, 2012
  3. Lyncheese

    New Member

    Jun 28, 2014
    In my opinion, your guess is right.

    I thought the same way.
    The second ground symbol is different from another to show that it's the RJ-45 ground, not the main circuit ground.

    The CT transformer simply just to make the insulation. And maybe to reduce the EMI/noise at the same time.

    By the way, It's just my personal opinion. CMIIW.

    Warm regards.