15. (R+E+S) HI+P
18.
Speed and confidence in the operations required for converting
16a. C+R+A
from a logic diagram to an output Boolean expression can best be
b. (C+R+A) Z
gained through practice. All problems should be solved
c. (C+R+A) Z+Y
systematically to develop the efficiency required of a technician.
17. (D+A) Y+Z+E
The diagram above is an example of a fourth-order-logic diagram
consisting of two AND gates and two OR gates. The logic diagram
is converted to an output Boolean expression by starting at the
inputs, using the step-by-step procedure, and working toward the
final output.
same manner as normal algebra to maintain proper
identity and separation of quantities. The quantity
(A+B+C) above is ANDed with D and must be shown with
parentheses. The quantity [(A+B+C) D+E] is ANDed with
FG and must be shown with brackets. If parentheses
were used again, the quantity ((A+B+C) D+E) would be
confusing.
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IT 0343
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