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# Simple Calculator

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## Dianne Sarmiento

on 26 March 2013

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#### Transcript of Simple Calculator

In the present time wherein numbers play a big role in everyday life, the tools needed to make these tasks easier becomes a great necessity. One of those necessity is the calculator. A calculator is a device that performs arithmetic operations on numbers. The simplest calculators can do only addition, subtraction, multiplication, and division. Design and Methodology TTL Recommendations Schematic Diagrams This solution is already the best we had but we recommend for those who will make the same simulation like this that there is a shorter but excellent solutions. Try also to research some other operations that will be a great success in simulating it. If you were as a group, in doing this project, TRY TO SHARE all of your ideas with each other to have an excellent calculator. Transistor–transistor logic (TTL) is a class of digital circuits built from bipolar junction transistors (BJT) and resistors. It is called transistor–transistor logic because both the logic gating function (e.g., AND) and the amplifying function are performed by transistors (contrast with RTL and DTL). Simple Calculator Group 7 As Electronics Engineering students, it is highly important that the students know how a calculator work hence, this project entitled “Simple Calculator” is done. The aim of the simple calculator is to design and simulate a simple two- digit calculator. The main objective of this study is to design a simple calculator that can perform simple operations like addition, subtraction, multiplication and division. The circuit is composed of transistor-transistor logic ICs which is a class of digital circuits built from bipolar junction transistors (BJT) and resistors. TTL became the foundation of computers and other digital electronics. Even after much larger scale integrated circuits made multiple-circuit-board processors obsolete, TTL devices still found extensive use as the "glue" logic interfacing more densely integrated components. TTL devices were originally made in ceramic and plastic dual-in-line (DIP) packages, and flat-pack form. TTL chips are now also made in surface-mount packages. Successors to the original bipolar TTL logic often are interchangeable in function with the original circuits, but with improved speed or lower power dissipation. Materials 1. National Instruments Multisim 12.0
2. 7408 – AND Gate
3. 7404 – NOT Gate
4. 74194 – Shift Register
5. 7485 – Comparator
6. 74107 – JK Flip-Flop
7. 7432 – OR Gate
8. 7427 – Three-Input NOR Gate
9. 7483 – 4-bit Binary Adder
10. 7486 – Quadruple 2-Input XOR Gate Block Diagram of the Simple Calculator Testing and Results Summary Conclusions ADDER CIRCUIT SUBTRACTOR CIRCUIT MULTIPLIER CIRCUIT BCD TO BINARY CONVERTER FIRST INPUT BCD TO BINARY CONVERTER SECOND INPUT DOUBLE DABBLE Ardid, Clarissa Mae Calaluan, Maricar Samortin, John Patrick Hernandez, Raymond Chester We found out that a simple calculator is not a simple thing to do.
There are some processes that needs bigger area to implement it.
Correcting factor is also a need to correct what will be our output.
There are also something that we have learned in this subject by
exploring like the double dabble for having the converting output
of binary to BCD. Inputs and other operations must be fully
controlled in order to have a perfect simulation. The simulation is started on 2 inputs. Input A is implemented with the process of storing code by
using jk flip-flops and shift registering when it had implemented in 2-digits. An operation is also implemented when it has finished placing the first input. The operations that can be used are addition, subtraction, multiplication, division and every operation contains IC’s and other logic gates.
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