EB-134 Complex Digital Circuits

Innovative Technologies in Education (ITE)

EB-134 Complex Digital Circuits

The EB-134 is a single board comprehensive instructional module designed to teach basic concepts of complex digital circuits to technology students. The module can be operated as a stand-alone unit or integrated to the newly developed EB-2000 Computer Managed Laboratory. The module contains experimental circuits with which the student performs a number of conceptual experiments at various levels of difficulty. Manual or computer driver fault-finding exercises and testing are available when the module is interconnected to the SB- 2000 system, providing valuable experience in the training and diagnosis of faults. Test equipment, when used, attaches to the board via 2mm jacks, placed at various points around the circuits. Students are required to do only a minimal amount of wiring so training time is maximised. A comprehensive student manual is provided with each training module. The manua1 correlates to the exercises to convey concepts relating to the technologies covered, allowing focus on specific performance objectives.

Description

The EB-134 module is designed so students will spend the maximum time on the experiments and practice drills for testing comprehension and troubleshooting. The module also ensures that students use their time more efficiently. The printed circuit boards are pre-wired so that set-up time is minimal. For operation the module is connected to a PUZ-2000. To facilitate the exercises, all the major signals are brought out on-board with 2mm jacks for tests and interconnections. The ICs and the transistors are mounted on sockets, enabling easy replacement. The student has only to plug-in the appropriate patching cords and shorting plugs in order to perform the recommended experiments. The boards also come equipped with "black boxes" containing components used in the fault-finding and practice modes, components that should not be visually identified by the trainee.

OBJECTIVES
Describe the functions of the 555 integrated circuit timer.

Calculate its output pulse width when operating as a monostable circuit.

Calculate frequency of oscillation when operating as an astable circuit.

Describe the functions of 4-bit binary ripple counter and draw the output waveforms.

Cascade counters to increase the count.

Use the counters as a frequency divider.

Know how to reset the counter, and how to parallel load a binary number into the counter, using it as a storage register.

Describe the function of a digital to analog converter.

Know how to calculate the output voltage for a known digital input.

Calculate the output voltage for a known digital input and calculate the step size.

Be able to test a digital to analog converter, and to check its linearity.

Know how to apply the multiplying characteristic of a digital to analog converter.

Construct and test an analog to digital converter.

Be able to describe its function and to measure its performance.

Describe the operation of a decoder and draw its output waveforms.

Be able to describe a multiplexer and explain its output waveforms when multiplexing several signals onto a single output.

Know how to use a decoder and a D flip-flop to demultiplex a multiplexed signal.

Be able to describe the functions and applications of an arithmetic logic unit.

Be able to explain how the arithmetic and logic functions or an ALU can be programmed by an input control word.

Troubleshoot complex digital circuits including timer circuits, counters, digital-to analog converters decoders and multiplexers.

RECOMMENDED EXPERIMENTS
555 Timer

Binary Ripple Counters

Analog to Digital Converter

Decoders, Multiplexers and Demultiplexers

The Arithmetic Logic Unit (ALU)

Troubleshooting

REQUIRED ACCESSORIES
DL-20 Standard set of 2mm Patching Cords and Shorting Plugs

REQUIRED MEASURING EQUIPMENT
20MHZ Dual Trace Oscilloscope Digital Multimeter 3-1/2 Digits [Model TK-DMM]

2.2MHZ AM/FM Function T Generator

OPTIONAL MEASURING EQUIPMENT
100 MHz Counter Timer TTL Logic Probe

MANUAL
Student and instructor manuals, written by pedagogues and electronics professionals, support every stage of the learning and teaching process.