Beginner Circuit Diagram Question

Discussion in 'General Electronics Chat' started by seal308, Jul 10, 2016.

  1. seal308

    Thread Starter New Member

    Jun 30, 2012
    11
    0
    Hello I designed a circuit that uses adders and made equations for their sum bits.
    S0 = 0
    S1 = X1
    S2 = ...
    etc
    I've drawn the circuits for S1,S2 etc but what does the S0 = 0 equation look like?
    It doesn't have any inputs, is it a wire, and from what?

    Thanks
     
  2. BobTPH

    Active Member

    Jun 5, 2013
    782
    114
    Assuming positive logic, it is a wire to ground (or more likely a resistor, also known as a pulldown)

    Bob
     
  3. WBahn

    Moderator

    Mar 31, 2012
    17,737
    4,789
    You might first as yourself if it makes sense that S0 is always 0. Maybe for your application it does, but whenever an output turns out to be a constant, it is worth asking if that makes sense.
     
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