- Details
- Parent Category: Engineering Assignments' Solutions
We Helped With This Electrical Engineering Homework: Have A Similar One?
| Category | Engineering |
|---|---|
| Subject | Electrical Engineering |
| Difficulty | College |
| Status | Solved |
| More Info | Electrical Engineering Help |
Short Assignment Requirements
Assignment Description
Department of Computing, Engineering and Technology
EAT119 Electrical and Electronic Principles
(Coursework 1 of 1)
Electrical and Electronic Circuit Design
Hand-in Date : To be announced on Sunspace
The following tasks are the practical element of the module and it is expected that students will perform them in their own time in the timetabled laboratory session and keep a record of your results.
At certain points in time of the modules operation you will be asked to submit a crosssection of the tasks in the form of a report detailing your solutions to the individually allocated tasks. The report(s) will contribute 50% to your overall module mark. The marks identified below indicate the maximum possible marks that each task contributes to the final mark and the actual mark awarded will depend upon your solutions and the quality of their reporting.
The finished report should be submitted to the resource centre (Prospect Building, St Peter’s) on, or before, the hand-in date(s) stipulated on sunspace.
The assignment requires you to use an individual load resistance whose value is based upon the last 3 digits of your University of Sunderland Student ID number, where
|
|
|
|
|
Student ID x y
z where RL 200§¨¨©5©§¨'
999xyz' ·¸¹ 1·¸¸¹
RL
i.e. ‘xyz’ = 291 gives RL 491.29:
I. Fletcher
Module Leader
Load Resistance Construction/Testing 10%
Calculate your individual load resistance value.
2. Having evaluated your individual load resistance, RL , then you are required to design it as accurately as possible using no more than two E12 resistors.
Note : i) Resistor Codes
Most Significant 2nd Most Significant Number of Tolerance
Digit Digit following zeros
0 BLACK 5 GREEN 1 BROWN 6 BLUE 2 RED 7 MAUVE 3 ORANGE 8 GREY 4 YELLOW 9 WHITE |
| 1% BROWN 2% RED 5% GOLD 10% SILVER |
 |
ii) The E12 resistor range is ( or multiples of 10 of ) :
1, 1.2, 1.5, 1.8, 2.2, 2.7, 3.3, 3.9, 4.7, 5.6, 6.8, 8.2, 10
iii) Each resistor can therefore be a single value, or created from two resistors in series or two resistors in parallel.
3. Construct your design and measure its resulting value with a multi-meter and explain any errors that are found.
Note : i) Use the resistance range on the multi-meter.
ii) Use ‘breadboard’ to construct the circuits that follow, i.e.
‘Common’ Column Connection lines
Potential Divider Circuit 20%
1 = 470: and your individual value for the load resistance, RL, in the following potential divider circuit, calculate :
a. the load voltage, VL, that appears across RL.
b. the total current drawn from the 9V supply, IS .
_
9V Battery
2. Construct the circuit in the lab and measure the load voltage and circuit supply current and compare your findings to the theoretical values, explaining any discrepancies between them.
Note : i) You may use a 9V battery or the 0-30V variable DC power supply provided to obtain the 9V supply.
ii) The current should not exceed 15mA during the experiment Current Divider Circuit 20%
1 = R2 = 470: and your individual value for the load resistance, RL, in the following current divider circuit, calculate :
a. the total current drawn from the 9V supply, IS .
b. the load current, IL, that passes through RL.
2. Construct the circuit in the lab and measure circuit’s supply current and load current and compare your findings to the theoretical values, explaining any discrepancies between them.
Note : i) You may use a 9V battery or the 0-30V variable DC power supply provided to obtain the 9V supply.
ii) The current should not exceed 15mA during the experiment Thevenin’s Equivalent Circuit and Maximum Power Transfer 20%
1 = 1k:, R2 = 470: and your individual value for the load resistance, RL, in the following circuit, calculate :
R1 R2
Determine the Thevenin equivalent circuit. Show all calculations and show the final circuit diagram.
Note : The load has already been removed and will appear across the terminals A and B.
2. Explain the maximum power transfer theory and show, via circuit simulation, how this will relate to your final Thevenin circuit.
Health and Safety 10%
You are required to complete a risk assessment for working with the electronic test equipment in room DG202.
Your risk assessment must include at least 3 and no more than 5 hazards. The hazards must be relevant to the lab, for example you will not be working with rotating machines.
This is also part of EAT100 Health and Safety Passport. You may use the same risk assessment.
You must also have a fully
completed Safety Passport.
Light Emitting Diode (LED) Operation 20%
1. Obtain an LED from the laboratory technician and connect the variable voltage supply to the LED as shown in the circuit below. Using this circuit determine the forward bias voltage at which 20mA flows through the diode by carefully increasing the supply voltage from 0V. Do not exceed 5V supply !
_
Variable 0-30V DC Voltage Supply
Note : LED Package Connections :
Anode
Cathode
Anode Cathode
2. Repeat Task F1 again but now with your load resistance in series with the LED.
i.e. _
Variable 0-30V DC L Voltage Supply
Note : You no longer need to limit the supply to 5V but still start from zero volts.
3. Use your previous findings, and circuit theory, to confirm the result you found in Task F2.
4. From your findings of Task F1 design a circuit that uses as many LED’s, identical to your own, connected in series and safely operating at 20mA to indicate the presence of a 10V fixed supply with maximum intensity.
Diode Characteristics
1. Obtain an 1N4001 Diode from the laboratory technician and construct the following circuit :
_
Variable 0-30V DC Voltage Supply RL
Record the currents that flow for input voltages of -10V to +10V in one volt steps.
Note : i) The 1N4001 is a silicon diode in the DO-41 package :
Anode Cathode
ii) For negative values of voltage you will need to reverse the supply connections shown.
iii) The current should not exceed 100mA during the experiment
2. Use your findings from Task G1 to plot the diodes characteristics and comment upon the validity of the experiment.
3. Compare your characteristics in Task G2 with theoretical ones and explain any discrepancies between them.
4. How do your results from Task G1 confirm that the 1N4001 is a silicon diode ?
5. Use your findings from Task G1 to indicate the output you would expect to see from the circuit when it is supplied by a 50Hz sine wave of peak voltage 10V and thereby identify the circuits operation.
NPN Transistor ’Inverter’ Driver
0V
1. Construct the circuit using a 2N3904 BJT NPN transistor and a 100k: 20 turn Cermet potentiometer for RB. With a 5V input voltage, Vin , adjust the value of RB until a collector current of 20mA occurs in the load.
Record the corresponding values of Vout and RB.
Note : i) The BJT 2N3904 NPN transistor uses a TO-92 package, where
(viewed from below) :
Collector Base Emitter
ii) The Cermet potentiometer is connected as a variable resistance via (ensure that RB is set to 100K: before beginning adjustment):
RB
iii) Once Vout has been recorded then remove the potentiometer RB
from the circuit and measure it using a multi-meter in resistance mode.
2. Use your results from Task H1 to estimate IB and hence evaluate the transistors current gain, E.
3. Comment upon your findings from Task H2 and compare them to the manufacturers specifications on their data sheet.
Logic System Implementation
Obtain a logic tutorial kit from the laboratory technician and connect a 5V supply to it :
Output LED’s
Input Switches
1. Having tested that a particular output LED is working (by supplying it with 5V directly) record the outputs of all the logic gate types but with no logic inputs connected. What does this tell you about the status of the gates logic input when left unconnected ? Note that a logic ‘high’of 5V and logic ‘low’ of 0V is assumed.
2. One simple solution to Task I1 is to connect any unused inputs to a logic gate to any used input. Provide 2 inputs ( A and B ) to a 4-input OR gate, using the switches provided, to demonstrate this. Why does this work for all gate types ?
Note : Test that all the switches are operating by connect each input
switch to an output LED and confirming it switches the LED on and off.
3. Using the switches as inputs A and B, construct the following circuit and derive its truth table. Use any theoretical method to confirm your findings and design a minimal gate structure to provide the same logic function.
A F
B
4. Design, construct and test a circuit that is capable of identifying any situation
(by producing a logic high alarm output) when all 3 inputs are not the same logic.
