Set Number 2"MK7502"

The main purpose of this set is to teach you Basic Digital science as the first step toward the world of advanced hard wares such as microcontrollers' memories and processors. It's been attempted to familiarize those who are excited in designing with the function of basic IC's such as logical gates uni-bit memories, counters, dividers, dividers and etc, leaning on mathematical theories discussions and enable them to design some simple circuits in the end. The following is a summary of what you will study and learn in this set.

In its firs part, mathematical basis and their function in relating hardwares together is described. The discussed bases are 10 and 2 and converting numbers from one base into another and the main four mathematical acts in each base. In addition to that you will learn the code definition, and how to make a truth table and display binary numbers by the help of some LED's.

In the second part you will learn about a device which is called board. The device that generally is used by the designers for the preliminary examination of their designed circuits is used in each experiment to free you from soldering. You can see the image of provided board below.

In the end you will learn how to read the numbers that are printed on an IC.

For the first practical step you will become acquainted with Butter gate. Basic logical gates such as butter gate, AND gate and so on are described by the help of truth table, key circuits and transistor circuit.

In further steps we will only use truth table or IC function table to analyze circuits due to complexity of IC inner structure. You will do some practical experiments with IC4050 that is a CMOS IC. The CMOS IC is used because its voltage is between 3.5 to 18v, so those who are interested in can do these experiments with any kind of adaptor that works with this range of voltage.

In the fourth part you will became familiar with simple inverter gate or simple NOT and optimized NOT which is called (Schmitt trigger) practically and will learn how to build a pulse generator by the help of these two gates. The introduced IC's of this part are: 4049 as simple NOT and 40098 as 3-state NOT and 4584 as Schmitt trigger NOT.

In the fifth part you will learn about the function of or gate as logical OR and also creating NOR gate by combining as OR gate and a NOT one, through doing practical experiments of this part. In this part the IC4071 is introduced and you can see a sample circuit of this part.

In the experiment you can change the input voltage of an OR gate according to the truth table by SA and SB double-throw switches and see the result by using a LED in output.

In the sixth part you will become familiar with the function of AND gate as logical "and", and producing a NAND gate and will study the related circuits. NAND gates are also available in two simple and Schmitt trigger types in the markets. Here we will study both of them and their differences IC4081 and IC4093 are introduced in this part. The telephone ringer is an interesting and practical example of the circuits of this part. You will find a summary of what you've learnt through the previous chapters and something about {Bole Algebra} and compound circuits.

In the seventh part OR-exclusive gate structure and the method of creating it by using previously mentioned basic gates and its related experiments are introduced. Then you will study about digital switch gate IC's that are introduced here are 4030 as EX-OR gate and 4016 as controllable switch gate. You can see the design of an EX-OR gate as well as its truth table.

In the eighth chapter you will learn how to set a flip-flap gate by using previously mentioned gates and different kinds of flip-flaps and the procedure of optimizing this gate to produce master-slave flip-flap gate and D flip-flap and etc. Flip-flap gate which is the base of memory circuits, shift register, and divider is fully described by suitable and practical circuits and experiments. The introduced IC's of this part are: 4013 as D flip-flap gate and 4015 as an eight-one numbered shift register. Producing noise on ordinary circuits and the way of reducing it by a denouncer circuit, that you can find its circuit below, are of interesting parts of this chapter.

At the end of this part you will find some points about data transmission in series and parallel forms in addition to something about seven-segment and its starter as a digit display and some new things about digital decoders. In the workshop of this part you will be familiarized with a decode counter and 4017IC and you will do its related experiments.

The ninth part is to familiarize you with some binary counters. In this part 4016 IC's as simple plan able counters and also 4020 counters are studied and some relevant experiments are provided. In the end of this part you are acquainted and worked with 4008 collector, 4512 multiplexer, 4063 digital comparative and 4311 seven segment starter. Here you can see the numbers that it can display and the order of its basis.

In tenth part of this set you will study how to connect CMOS and TTL IC's together, introducing some IC's such as 4050 as connection medium between CMOS and TTL, Analog to digital converter, plan able counters and some books. In the end you will study V.C.O CIRCUIT AND 4046 IC and something about 79xx and 78xx IC stabilizers, matrix key sets and multiplexing the number display for multi-digit displays and will do the relevant experiments.

In the eleventh part of this set the 5 kits that are provided together with this set are studied. You can examine what you've learnt up to now through assembling their parts:


1- MK7502A: it consists of two simple and compound pulse generators that are adjusted to create special pulses. In addition, it can create a clear and noiseless pulse to be sent to various appliances by pressing a key. Here you can see the design of its components.

2-MK7502B: with its 2 IC's is designed to compare two 8 bit digits. When the two 8-Bit (one bite) numbers are equal, its output starts and can be used to instigate the other circuits. You can see its design in this image.

3-MK7502C: consists of two 0-99 digit counters. In one of them numbers begin to increase by pressing a key and in the other counter, the act of counting is done by the controlled pulses that are created through another system. You can see its plan here.

4-MK7502D: is designed for a two digit display. This set consists of two boards to set the system that is provided at the end of this educational pamphlet. You can use these two kits in every other system in which digital numbers are needed to be seen. You can see the plan of one of them here.