Half Adder Challenge

Discussion in 'The Projects Forum' started by TTLMaster, Jun 20, 2014.

  1. TTLMaster

    Thread Starter New Member

    Jun 20, 2014
    3
    0
    I have recently made a simple half adder circuit using TTL and RTL logic. The circuit totals 13 components (8 resistors and 5 transistors) minus the logic inputs and outputs, ground, and Vcc. I want to see if any other users can make a working half adder using less components. That is my challenge to you.

    P.S. For my circuit simulator, I downloaded it from here:
    http://www.falstad.com/circuit/
     
  2. dougc314

    Member

    Dec 20, 2013
    38
    11
    I submit a DTL AND function uses three parts rather than the 5 for the RTL AND.
     
  3. TTLMaster

    Thread Starter New Member

    Jun 20, 2014
    3
    0
    Thank you for your submission. Unfortunately, the circuit simulator I have does not have Schottky diodes. So, for all intensive purposes, I used normal diodes in the place of the Schottky ones.

    The circuit now has 11 components (6 resistors, 3 transistors, and 2 diodes).
     
  4. TTLMaster

    Thread Starter New Member

    Jun 20, 2014
    3
    0
    I ended up solving the problem myself. Unfortunately, LEDs have to be used since in the XOR Gate, it is only a logic HIGH when current passes through it. But anyways, here is the final circuit I have come up with. The circuit has 2 LEDs, 3 resistors, and 6 diodes. It uses diode logic rather than diode-transistor logic. Since it uses diode logic, it is not practical to combine to make larger circuits, but it is very simple.
     
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