digital report botak
TRANSCRIPT
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OBJECTIVES
y To investigate the behaviors of all the logic gates involved in the lab experiment.y To make comparisons between the input and output between different logic gates.y To enhance students in becoming a little bit more experts in constructing digital
electronic circuits.
y To explore the output of a combination of more than one logic gate in a circuit.y To ensure that the students have all the skills and adequate knowledge regarding
logic gates.
y To ensure that students can analyze the truth table of the logic gates used in thecircuits manually or theoretically.
y To compare the results of the logic gates circuits theoretically and practically.y To indentify the reasons to the problems of where the output of the logic gates
circuits does not match theoretically and practically sometimes.
y To ensure that students can describe the operation of logic gates well.y To ensure that the students can analyze Boolean algebra well.y To ensure that the student can design combinational logic circuits well.
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INTRODUCTIONOF LOGIC
GATE
A logic gate is a combination of different electronic components, which takes one or more logic-
level inputs and produces a single logic-level output. Presently, nowadays many electrical
appliances are found to be able to receive commands for carrying out their specific tasks.
The appliances takes in information from environment, make a decision on the
information and then give out the result as an output. An electronic device that can be
used to perform this operation is called as logic gates.
In logic gate, there may be one or more inputs however there can only be one output for
one logic gates, unless in a circuit there are more than one logic gate combined together
to produce more than one output. The inputs and outputs of this logic gates are mainly
consisting of the digit 1 and 0 only. It is only when the inputs or outputs are at
HIGH condition it is considered as 1 and when in LOW condition, it is considered as
logic 0.
There are several classes of significant logic gates. Namely they are the AND GATE,
OR GATE, NOT GATE, NAND GATE, NOR GATE, X-OR GATE and X-
NOR GATE. These different gates bring different outputs from one another when the
same inputs is inserted or applied. In other words, different gates bring different
characteristics.
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Explanations practical test for task 6
Question task 6
a chemical plant needs a microprocessor-driven alarm system to warn a critical condition
on one of its chemical tanks. The tanks have four HIGH/LOW (1/0) switches that
monitor temperature (T), pressure(P), fluid level(L), and weight(W). design a system that
notifies the microprocessor to activate an alarm when any of the following conditions
arise
i. High fluid level with high temperature and high pressureii. Low fluid system with high temperature and high weight
iii. Low fluid level with low weight and height temperatureiv. High fluid level with low weight and high temperature
Explanations task 6
Task 6 is a question that needs us to design our own truth table and circuits based on the
conditions that has been provided to us as stated in the job sheet. After finish doing the
truth table, a Boolean expression is needed to be written from the truth table so that logic
gates construction can be designed from the expression. Finally, simulate the logic gates
construction in multisim to test its validity whether the output obtained from the multisim
circuit is as the same as the theory made earlier. Thus, the result is compared and the
result is valid as it is the same practically and theoretically. The results can be observed at
the job sheet given.
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Task 6
In this task I design this circuit used AND gate (7408), OR gate (7432), NOT gate
(7404), LED and switch. This circuit has 4 inputs that are T (temperature), P (pressure), L
(fluid level) and W (weight). The LED is to present the output of this circuit. To check
the answer refers to truth table.
TRUTH TABLE
INPUT OUTPUT
T P L W X
0 0 0 0 0
0 0 0 1 0
0 0 1 0 00 0 1 1 0
0 1 0 0 0
0 1 0 1 0
0 1 1 0 0
0 1 1 1 0
1 0 0 0 1
1 0 0 1 1
1 0 1 0 1
1 0 1 1 0
1 1 0 0 1
1 1 0 1 1
1 1 1 0 1
1 1 1 1 1
KARNAUGH MAP
TP/LW 00 01 11 10
00
01
11 I I I I
10 I I I
EXPRESSION FROM K.MAP = TP + TL + TLW
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CIRCUIT DESIGN BASED FROM EXPRESSION, TP + TL + TLW.
When L= 1 T=1 P= 1 W= X OUTPUT= 1
When L= 0 T=1 P= x W=1 OUTPUT= 1
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When L= 0 T=1 P= x W=0 OUTPUT= 1
When L= 0 T=1 P= x W=0 OUTPUT= 1
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Explanations practical test for task 7
Question task 7
Design a combinational circuit that uses only NAND gates to implement a security
system for a TEXAS factory. The circuit has two inputs A (that is high when the
system is armed, low else) and D (that is high when the door is open, low else) and two
output G (green LED) and R (red LED). The circuit will operate as follows:
i. When the door is closed and the system is armed the green LED will beilluminated and the red LED will not be illuminated.
ii. When the door is open and the system is armed the red LED will be illuminatedand the green LED will not be illuminated.
iii. When the system is not armed, both red and green LED will be illuminated.
Explanations task 7
Task 7 needs me to design a combinational circuit that uses only NAND gates to
implement a security system for a factory. This task needs me to design and create the
circuit of logic gates based on the question that given on the job sheet. After that, a truth
table is written in theoretically. From the Boolean expression, construct the logic circuit.
This circuit is then simulated in multisim to test its validity. Lastly, the result that
obtained from multisim is valid as the theory results.
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Task 7
In task 7, I design this circuit used OR gate (7432), NOT gate (7404) as a combinational
gates for NAND gates, LED and switch. This circuit has 2 inputs that are inputs A (that
is high when the system is armed, low else) and D (that is high when the door is open,
low else). The LED is to present the output of this circuit. To check the answer refers to
truth table.
TRUTH TABLE
INPUT OUTPUT
D A G R
0 0 1 1
0 1 1 0
1 0 1 1
1 1 0 1
KARNAUGH MAP
A / D 0 1
0 1 1
1 1 0
G = A + D R= A + D
EXPREESION FROM KARNAUGH MAP, G = A + D, R= A + D
A / D 0 1
0 1 0
1 1 1
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CIRCUIT DESIGN BASED FROM EXPRESSION, G = A + D, R= A + D
When A = 0 D = 0 OUTPUT R=1 G=1
When A = 1 D = 0 OUTPUT R=1 G=0
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When A = 0 D = 1 OUTPUT R=1 G=1
When A = 1 D = 1 OUTPUT R=0 G=1
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CONLUSION
When I finish this assessment lab, I learn how to produce a logic gate using switch,
resistance and LED to determine the output. In this job sheet, I also learn about how to
describe the logic operation for logic that has 2 inputs and 3 input. The other thing that I
learn in this practical test that is how to design the circuit and how to understand the
operation of logic circuit by using the formula that we have learn in class before do the
practical test. To analysis the problem I have do using Boolean algebra to answer the
question and to find the problem at the circuit. I also learn a little why the circuit
sometime not fully functions. This happen because a problem by using the older project
board or the another equipment was broken. This assessment is good because it can give
the student very skillful after finish the practical. As in conclusion, this practical test and
lab assignment is to test the credibility and creativity of the students to describe the
characteristics of various logic gates and how to identify them. Apart from that, students
must also know how to analyze Boolean algebra and how to design combinational logic
circuits. By doing this assessment, all those criteria has been satisfied, however, there are
some circuits that the outputs are quite different from theory. This might due to some
reasons such as the flaw and slack of the project board and also the condition of the
electronic components used. Nevertheless, a comparison of the theory result and also the
practical is needed to be recorded so that the flaws of the practical circuit can be detected.
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REFERENCE
BOOK:
y Digital electronic (third edition) prentice hally Digital system (sixth edition) tocci prentice hally Longman Essential Physics SPM book by Yap Eng Keat and Khoo Goh Kowy Digital Fundamentals fifth book by Floyd
WEBSITE:
y www.wikipedia.comy http://www.geocities.com/templarser/gates.htmly http://www.technologystudent.com/elec1/dig3.htm
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