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5.5 LOGIC CIRCUIT
LOGIC SYSTEMS
• System performs calculation or makes decisions
• A logical operation on one or more logic inputs
  and produces a single logic output to make
  decision.
• Using electronic component that can conduct
  electricity based on a rule either analog or digital.
• Primarily implement using diodes or transistor
  acting as electronic switch
POSITIVE AND NEGATIVE LOGIC
• Binary digits are use for the input in logic gate
• Positive logic : Low voltage = 0
                   High voltage = 1
• Negative logic : Low voltage = 1
                    High voltage = 0
* Normally use positive logic
OR GATE
       IF GOT 1 = RESULT MUST BE 1


   X        A     B     X
            0     0     0
            0     1     1
            1     0     1
            1     1     1
           X = A + B
AND GATE
       IF GOT 0 = RESULT MUST BE 0


            A     B     X
            0     0     0
            0     1     0
            1     0     0
            1     1     1
           X = A.B
NOT GATE


       A X
       0 1
       1 0
NAND GATE

            A   B   X
            0   0   1
            0   1   1
      X
            1   0   1
            1   1   0
NOR GATE

           A   B   X
           0   0   1
    X
           0   1   0
           1   0   0
           1   1   0
EXCLUSIVE OR GATE

                    A   B   X
                    0   0   0
                    0   1   1
                    1   0   1
         X
                    1   1   0
EXCLUSIVE OR GATE
                                       C   B   A   X
                                       0   0   0   0
                                       0   0   1   1
                                       0   1   0   1
                                   X   0   1   1   0
                                       1   0   0   1
Any ODD number of Inputs gives X       1   0   1   0
                                       1   1   0   0
                                       1   1   1   1
EXCLUSIVE NOR GATE

A                    A   B   X
             X
B
                     0   0   1
                     0   1   0
             X       1   0   0
                     1   1   1
GATE TABLE

                                        EX-   NOT
A   B   OR   NOR   AND   NAND   EX-OR
                                        NOR    A

0   0   0    1     0      1      0      1     1
0   1   1    0     0      1      1      0     1
1   0   1    0     0      1      1      0     0
1   1   1    0     1      0      0      1     0
UNIVERSAL GATE
• NAND gate is universal gate
• It can make another gate
     NOT GATE                   AND GATE




                     OR GATE



            B
IC - INTEGRATED CIRCUIT

     Quad 2-input AND Gate 7408
ADDERS
• An adder or summer is a digital circuit that
  performs addition of numbers.
• For new processor, adder are use to calculate
  addresses, table indices (database).
• The most common adders operate on binary
  numbers
HALF ADDER CIRCUIT
• Required 2 input and provide 2 output
• Combination of an exclusive OR and an AND
  gate
                            A   B   SUM CARRY
                            0   0    0    0
                            0   1    1    0
                            1   0    1    0
                            1   1    0    1

                           SUM = A B
                           CARRY = A . B
FULL ADDER CIRCUIT
• Required 3 input provide 2 output
• Combination of 2 half adder and OR gate.
                               INPUTS          OUTPUTS

                           A     B      Cin   Cout   S
                           0     0      0      0     0
                           1     0      0      0     1
                           0     1      0      0     1
                           1     1      0      1     0
                           0     0      1      0     1
                           1     0      1      1     0
                           0     1      1      1     0
                           1     1      1      1     1
AIRCRAFT LOGIC CIRCUIT
• LANDING GEAR WARNING CIRCUIT
AIRCRAFT LOGIC CIRCUIT
• FLIGHT DIRECTOR GYRO FLAG
   - drop when gyro system malfunction either
    loss of vacuum or electrical signal


        Error Flag
GYRO FLAG SYSTEM
SERVO ALTIMETER OFF FLAG
• Correct operating when sin outputs (‘0’) and the cos
  outputs (‘1’).
• When total output is 1, it will energising the OFF Flag
  coil, removing the flag from view.

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EASA Part 66 Module 5.5 : Logic Circuit

  • 2. LOGIC SYSTEMS • System performs calculation or makes decisions • A logical operation on one or more logic inputs and produces a single logic output to make decision. • Using electronic component that can conduct electricity based on a rule either analog or digital. • Primarily implement using diodes or transistor acting as electronic switch
  • 3. POSITIVE AND NEGATIVE LOGIC • Binary digits are use for the input in logic gate • Positive logic : Low voltage = 0 High voltage = 1 • Negative logic : Low voltage = 1 High voltage = 0 * Normally use positive logic
  • 4. OR GATE IF GOT 1 = RESULT MUST BE 1 X A B X 0 0 0 0 1 1 1 0 1 1 1 1 X = A + B
  • 5. AND GATE IF GOT 0 = RESULT MUST BE 0 A B X 0 0 0 0 1 0 1 0 0 1 1 1 X = A.B
  • 6. NOT GATE A X 0 1 1 0
  • 7. NAND GATE A B X 0 0 1 0 1 1 X 1 0 1 1 1 0
  • 8. NOR GATE A B X 0 0 1 X 0 1 0 1 0 0 1 1 0
  • 9. EXCLUSIVE OR GATE A B X 0 0 0 0 1 1 1 0 1 X 1 1 0
  • 10. EXCLUSIVE OR GATE C B A X 0 0 0 0 0 0 1 1 0 1 0 1 X 0 1 1 0 1 0 0 1 Any ODD number of Inputs gives X 1 0 1 0 1 1 0 0 1 1 1 1
  • 11. EXCLUSIVE NOR GATE A A B X X B 0 0 1 0 1 0 X 1 0 0 1 1 1
  • 12. GATE TABLE EX- NOT A B OR NOR AND NAND EX-OR NOR A 0 0 0 1 0 1 0 1 1 0 1 1 0 0 1 1 0 1 1 0 1 0 0 1 1 0 0 1 1 1 0 1 0 0 1 0
  • 13. UNIVERSAL GATE • NAND gate is universal gate • It can make another gate NOT GATE AND GATE OR GATE B
  • 14. IC - INTEGRATED CIRCUIT Quad 2-input AND Gate 7408
  • 15. ADDERS • An adder or summer is a digital circuit that performs addition of numbers. • For new processor, adder are use to calculate addresses, table indices (database). • The most common adders operate on binary numbers
  • 16. HALF ADDER CIRCUIT • Required 2 input and provide 2 output • Combination of an exclusive OR and an AND gate A B SUM CARRY 0 0 0 0 0 1 1 0 1 0 1 0 1 1 0 1 SUM = A B CARRY = A . B
  • 17. FULL ADDER CIRCUIT • Required 3 input provide 2 output • Combination of 2 half adder and OR gate. INPUTS OUTPUTS A B Cin Cout S 0 0 0 0 0 1 0 0 0 1 0 1 0 0 1 1 1 0 1 0 0 0 1 0 1 1 0 1 1 0 0 1 1 1 0 1 1 1 1 1
  • 18. AIRCRAFT LOGIC CIRCUIT • LANDING GEAR WARNING CIRCUIT
  • 19. AIRCRAFT LOGIC CIRCUIT • FLIGHT DIRECTOR GYRO FLAG - drop when gyro system malfunction either loss of vacuum or electrical signal Error Flag
  • 21. SERVO ALTIMETER OFF FLAG • Correct operating when sin outputs (‘0’) and the cos outputs (‘1’). • When total output is 1, it will energising the OFF Flag coil, removing the flag from view.