(CMM1) Digital Trainer

(CMM1)

Advanced Digital Applications Modules

item	:	Digital Trainer
Model	:	EFT-DTX	Advanced Digital Application Modules

This digital application modules trainer is designed to provide further and more extensive studies about some important digital circuits. The students are recommended to finish all experiments in Labtech Logic and Advanced digital trainer (EFT-DTL, EFT-DTA) before proceeding to this application trainer. The trainer offers wide range of most common digital application circuits that are used in digital electronics

The trainer consists of a number of individual modules that can be used with the Digital electronics Lab Base Station (EFT-LBS-3). Each application circuit module is printed on a special design PCB that shows the circuit layout on top of the PCB (component side). In addition, the circuit path is able to be observed from the bottom side of the PCB (solder side). During the exercises, the student makes essential connections by using 2 mm stackable connection leads. In this way the student is able to construct and to complete the circuit in each of the practical exercises.

While doing the practical circuit exercises, the students are also expected to take many electronic instrument measurements in order to understand and to study the circuit electrical characteristics and behavior. The measurements are taken at the test point locations that are purposely provided for this reason.

The circuit module is placed on a digital base station that facilitates other requirements for the module such as: digital data switches, digital logic indicator, pulse switches, clock generator, seven segment displays etc. See page EFT10 and EFT04 for detail base station which is ordered separately.

A comprehensive experiment manual is provided to guide the students in studying the various application modules. This manual includes step-by-step instruction to prepare the modules for the experiment as well as some theory to strengthen the student’s knowledge in areas that is important as a background which is needed before doing the experiment

1. ARITHMETIC LOGIC UNIT

MODEL : EFT-DTX-1

An Arithmetic Logic Unit is a device that does AND. OR, Add, Subtract functions and also performs a variety of other operations on binary word. This device is a very important part of the microprocessors and microcomputer systems.

- 74181 IC can be programmed with binary instruction on its selected inputs to perform arithmetic or logic operation on two 4 binary words.

- 7476 IC is used as data selector for logic operation in 74181

2. ENCODER AND DECODER APPLICATION

MODEL : EFT-DTX-2

The Encoder translates the 10 inputs generated from the switches to be inverted to BCD forms. The” latch enable” circuitry generates a short pulse for each keystroke, which then transfers the to Encoder output.

The 4-bit latch holds BCD data at the Decoder inputs. The Decoder translates from BCD to seven-segment code. This code lights the proper segment on the seven-segment output display.

3. DATA TRANSMISSION AND DIGITAL SWITCHING NETWORK SYSTEM

MODEL : EFT-DTX-3

This device is used for sending and receiving serial data and are called multiplexers (MUX) and demultiplexers (DEMUX). Parallel data from one digital device is changed into serial data by the MUX. A single wire transmits the serial data. The serial is reassembled into parallel data at the output by the DEMUX. Notice the control lines that must also connect the MUX and DEMUX. These control lines keep the MUX and DEMUX synchronized. So that the 16 input lines are cut down to only a few transmission lines.

4. FREQUENCY TO VOLTAGE AND VOLTAGE TO FREQUENCY CONVERTER

MODEL : EFT-DTX-4

The LM 331 is a monolithic circuit designed for accuracy and versatile operation when applied as a voltage to frequency (V to F) converter or as a frequency to voltage (F to V) converter. The operation of these circuit blocks is best understood by going through the operating cycle of the basic V to F converter, which consists of the simplified block diagram of the LM 331 and various resistors and capacitors connected to it.

5. USART Modules

MODEL : EFT-DTX-5

To send and receive serial data, there must be a circuit that converts the parallel data to serial data and convert the serial data to parallel data. The shift register is the basic logic element used to do this job. The shit register can be loaded with parallel data. The register is then clocked (shift), and the data comes out one bit at a time (one bit for each clock cycle). To convert serial data to parallel data, we reverse the parallel to serial converter. The serial data is clocked into the shift register. Once all of the data word is in the register, the data is read from the shift register’s parallel outputs. The device that does all of these functions is called a USART. The 8251 USART device is used in this application module.

6. ANALOG TO DIGITAL CONVERTER AND DIGITAL TO ANALOG CONVERTER

MODEL : EFT-DTX-6

The process of converting an analog voltage into an equivalent digital signal is known as “ analog to digital (A/D) conversion”. This operation is somewhat more complicated than the converse of D/A conversion. A number of different methods have been developed, the simplest of which is probably the simultaneous method.

The A/D circuit and D/A circuits help the students to understand various techniques in doing D to A and A to D conversion.

The Topics covered in this experiments are :

A) Weighed Resistances Ladder Network Converter

B) R-2R Ladder Network Converter

C) Fast 8-bit DAC

D) Fast 8-bit ADC

7. COMPUTER FUNDAMENTALS TRAINING MODULE

MODEL : EFT-DTX-7

This computer fundamentals training module provides excellent basic knowledge about microprocessor system. The module consist of medium side scale integrated circuits that are used in digital computer such as Arithmetic Logic Unit (ALU), Memory, Register, Data Selector decoder etc.

Topics of experiment covered :

1. Familiarization of microprocessor basic components

2. Registers

3. Decoders

4. Programmable Counters

5. Addition and Subtraction

6. Arithmetic Logic Unit (ALU)

7. Data Storage and Retrieval (Memory)

8. The Basic computer cycles

9. A Simple Complete Processor System

8. BREADBOARD MODULE

MODEL : EFT-DTX-8

This module is very useful for doing practical applications or some tests when building particular digital circuits or doing prototyping on some sections of the more complex digital circuit. The breadboard module is installed in such way so it can be inserted in to the railing system on the digital trainer base station.