capacitors design

Discussion in 'The Projects Forum' started by bocvaroskiriste, Oct 12, 2012.

  1. bocvaroskiriste

    Thread Starter New Member

    Oct 31, 2009
    4
    0
    I have made plc program for one machine and is working on simulator.
    Now i want to make same thing but in a different way with multiplexers.
    I teseted and is working with logicsim.
    One thing i dont known for inputs i must to put capacitors but i do not known how to design it( which capacitor to take it and how to make the input circuit to multiplexer) . Can you help me.
    BEST REGARDS

     
  2. DickCappels

    Moderator

    Aug 21, 2008
    2,647
    632
    You can probably get help if you post a schematic and a description of the signals. The input to the simulator would probably be a great help.
     
  3. bocvaroskiriste

    Thread Starter New Member

    Oct 31, 2009
    4
    0
    Dear Sirs
    I send attacmenat in zip file.
    I made some schematic of digital design with mux'es and i do not known to put in input circuit some capacotors or not and how to calculate the capacitors and resitors valvues .
    Please send me some instructions
    BEST REGARDS
     
  4. bocvaroskiriste

    Thread Starter New Member

    Oct 31, 2009
    4
    0
    Dear Sirs
    It is not the problem with inputs they can be one or zero but the problem is in the capacitor see the attacment .
    BEST REGARDS
     
  5. wayneh

    Expert

    Sep 9, 2010
    12,089
    3,027
    Why do you believe you need a capacitor there? I'll guess that it is to act as a low pass filter, to send high-frequency noise to ground?

    If that guess is right, the answer will depend on the frequency cutoff you need, and on the impedance of mux. The capacitor works with the resistance as an RC tank to absorb pulses.
     
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