correction to "The NOT Gate"

Discussion in 'Feedback and Suggestions' started by optomist1, Mar 23, 2011.

  1. optomist1

    Thread Starter New Member

    May 5, 2010
    9
    0
    I believe Volume 4 Chapter 3 The NOT Gate s/b "This circuit is composed exclusively of resistors, diodes and bipolar transistors." instead of

    "This circuit is composed exclusively of resistors and bipolar transistors."

    Good site...

    Marty
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    http://www.allaboutcircuits.com/vol_4/chpt_3/2.html

    Good call.

    This is a TTL gate. A RTL gate would be a bit different. A TTL gate can be built without diodes, but since the author chose to use this schematic it is a false claim. D1 isn't really needed, and R4, Q3, D2, and Q4 is a classic TTL totem pole output, fairly standard on most TTL gates.
     
    Last edited: Apr 2, 2011
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