· Web viewAssignment 1 SAFE WORKING PRACTICES IN ELECTRONICS Complete the figure below by...

BTEC FIRST CERTIFICATE IN ENGINEERING

UNIT 19 ELECTRONIC CIRCUIT CONSTRUCTION & TESTINGELECTRONIC CIRCUIT CONSTRUCTION & TESTING

UNIT 19UNIT 19

ELECTRONIC CIRCUIT CONSTRUCTION &ELECTRONIC CIRCUIT CONSTRUCTION & TESTINGTESTING

WORKBOOKWORKBOOK

ASSIGNMENT CHECKLIST

ASSIGNMENT TITLEComplete

Y/N CRITERIA ACHIEVED

ASS 1P1, P2 & P6

SAFE WORKING PRACTICES IN SAFE WORKING PRACTICES IN ELECTRONICSELECTRONICS

ASS 2P3,

P4, P5 & M1

ELECTRONIC COMPONENTS & ELECTRONIC COMPONENTS & CIRCUIT CONSTRUCTIONCIRCUIT CONSTRUCTION

ASS 3M2, D1

ELECTRONIC CIRCUIT TESTING ELECTRONIC CIRCUIT TESTING TECHNIQUESTECHNIQUES

MODULEGRADE AWARDED

Student declaration I declare that all the work submitted for this assignment is my own work or, in the case of group work, the work of myself and the other members of the group in which I worked, and that no part of it has been copied from any source. I understand that if any part of the work submitted for this assignment is found to be plagiarised, none of the work submitted will be allowed to count towards the assessment of the assignment Signed ……………………………… Date Submitted……………………………


UNIT 19UNIT 19


Assignment 1Assignment 1

SAFE WORKING PRACTICES INSAFE WORKING PRACTICES IN ELECTRONICSELECTRONICS



Complete the figure below by correctly identifying and colour coding the ‘Live’, ‘Neutral’ and ‘Earth’ cables and filling the labels where required.

In the space below, write a simple instruction guide that illustrates how to fit a plug to a 240V Mains Electrical Appliance


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………………………………………………

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The Figure below shows a simple wiring diagram for a home lighting circuit.

Complete the diagram by identifying the Live, Neutral and Earth cables.

In the space below, explain why it is necessary to ensure that this type of circuit is ‘Earthed’ correctly.


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In electronics and electrical engineering a fuse is a type of sacrificial over current protection device. Its essential component is a metal wire or strip that breaks when too much current flows, which interrupts the circuit in which it is connected. Short circuit, overload or device failure is often the reason for excessive current.

In the space provided below explain why it is important to ensure that the correct value of fuse is fitted to an electrical appliance

We can calculate the current of an Electrical Appliance and therefore determine the fuse size required using the following formula,

P = I X V (power = current x voltage)

For example,

Kasim has to travel abroad as part of his work. Knowing that not all hotels provide a 'Welcome Tray' he buys a travel kettle so he can always make coffee for himself. On checking the Kettle he realises that there is no plug attached and therefore no fuse. In order to determine the correct fuse value Kasim must first work out the CURRENT used by the appliance.

The kettle is marked 720 Watts at 240 Volts.

Assuming that the kettle is to be used on mains 240 volts the calculation is as follows,

P = I X VI = P / VI = 720 / 240

I = 3 amps


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Calculate the current used by the following Household Electrical Appliances then specify the correct fuse value assuming that they are to be operated on a 240 volts mains electric supply

1. Electric Kettle 3KW at 240 Volts

SUGGESTED FUSE VALUE……………………………………………………

2. Steam Iron 2.2KW at 240 Volts


3. Portable Electric Heater 2KW at 240 Volts


4. Washing Machine 1.02KW at 240 Volts




Describe the procedures that are to be followed in the event of discovering someone who is suffering an electric shock


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The images below show a range of the tools and equipment used in the stages in manufacturing a PCB in a school workshop. In the spaces provided, write any safety precautions, which should be taken when using the equipment,

i.e. when using ‘developer’ and the ‘etching solution’ the operator should always wear protective clothing such as gloves and apron.


CHEMICAL ETCHING TANK

…………………………………………………………… ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

PCB DRILLING STATION ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

SOLDERING IRON……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

HAND TOOLS……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………


UNIT 19UNIT 19


ASSIGNMENT ONEASSIGNMENT ONE

SAFE WORKING PRACTICES INSAFE WORKING PRACTICES IN ELECTRONICSELECTRONICS

This assignment covers P1 & P6 of unit 19

CompleteY/N ASSESSOR FEEDBACK

TASK 1P1

TASK 2P1 & P6


NAME…………………………………………………………………………….


Task 1 – Using tools and equipment safely.

The images below show examples of the tools and processes used when manufacturing Electronic circuits. For each of the examples you need to list TWO safety aspects that should be followed when using the equipment or carrying out the process.


USING A PCB DRILLING STATION TO DRILL HOLES IN A PCB

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USING A CHEMICAL ETCHING TANK

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USING HAND TOOLS

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USING A SOLDERING IRON AND SOLDER

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Task 2

555 Monostable circuit prototyping experiment

REPORT



555 Monostable circuit prototyping experiment

Task ____________________________________________________________________________________________________________________________________________

Method _____________________________________________________________________________________________________________________________________________________________________________________________

Equipment / Materials / Components_____________________________________________________________________________________________________________________________________________________________________________________________





Findings / Results / Problems /Conclusions___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

555 Monostable Prototyping Experiment Photographs of experiment



PCB Assembly

Report of assembly including safety points

______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Photographs of Assembly


Engineering Department

Witness Statement

Student Name

Programme BTEC first certificate in Engineering

Unit Number / Title 19 / ELECTRONIC CIRCUIT CONSTRUCTION & TESTING

Which part(s) of the unit have been met? Observation notesHow student’s performance met the

requirements of the specification

P1 use safe working practices in thelaboratory/workshop

P6 construct a given electronic circuit

Through the manufacture of a 555 Monostable Electronic Circuit using a wide range of tools and equipment including, snips, strippers, soldering iron and PCB drilling station.

..............................................

Has clearly demonstrated that he/she is able to fulfil the assessment criteria shown.

This witness statement is supported by the written answers and the evidence shown through the ‘monostable experiment report’ in this assignment brief.

How and where the activity(s) took place?

Through the manufacture of a monostable Electronic Circuit, using a wide range of tools and equipment including, snips, strippers, soldering iron and PCB drilling station.

DateUNIT 19 ELECTRONIC CIRCUIT CONSTRUCTION & TESTINGELECTRONIC CIRCUIT CONSTRUCTION & TESTING


Witness signature

Witness name Tel. No 01254 59055



UNIT 19UNIT 19

ELECTRONIC CIRCUIT CONSTRUCTION & TESTINGELECTRONIC CIRCUIT CONSTRUCTION & TESTING

MODULE TWOMODULE TWO

ELECTRONIC COMPONENTS & CIRCUIT CONSTRUCTION



ELECTRONIC COMPONENTS

Fill in the spaces in the table below by stating the component name and sketching its electronic symbol

Component Symbol Actual/Real Life




…………………………………….. are found in almost every .. are found in almost every electronic circuit. Their jobs include protecting electronic circuit. Their jobs include protecting …………………….. such as ……………………………….. such as …………

Resistors are components which Resistors are components which ………………………… the …………….. of ………………………… the …………….. of ………………………………… through a …………………………………………… through a …………

RESISTORSRESISTORS

There are three main types of There are three main types of resistor.resistor.

………………………….... ……………………………………………………………………..

This is the circuit symbol The …………… of a …………….. The …………… of a …………….. tells us how much the current tells us how much the current will be slowed down. The value will be slowed down. The value is given by the is given by the …………………………… on the…………………………… on the …………………………………………………………

The value of a Resistor is The value of a Resistor is ………………… in ……………… ………………… in ……………… This is represented by this This is represented by this symbol symbol




a. Using the resistor colour band chart above, Determine the colour bands for the following resistors

R1= 10k

Band 1 ………………………………………………………………………………….

Band 2 ………………………………………………………………………………….

Band 3 ………………………………………………………………………………….



R2= 180R

Band 1 ………………………………………………………………………………….

Band 2 ………………………………………………………………………………….

Band 3 ………………………………………………………………………………….

R3 = 1K

Band 1 ………………………………………………………………………………….

Band 2 ………………………………………………………………………………….

Band 3 ………………………………………………………………………………….

R4 = 100K

Band 1 ………………………………………………………………………………….

Band 2 ………………………………………………………………………………….

Band 3 ………………………………………………………………………………….

b. Determine the value of the resistors in Ohms with the following color codes:

Red, red, red & gold …………………………………………………………

Brown, black, red & gold…………………………………………………………

Yellow, violet, orange & gold…………………………………………………………

Brown, black, green & gold…………………………………………………………

Brown, black, black & gold…………………………………………………………




THE DIODE___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

CIRCUIT SYMBOL

THE LED (LIGHT EMITTING DIODE)___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

CIRCUIT SYMBOL



THE TRANSISTOR___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

CIRCUIT SYMBOLS

THE CAPACITOR___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

CIRCUIT SYMBOLS



SWITCHES_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

CIRCUIT SYMBOLS

AUDIO OUTPUTS_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

CIRCUIT SYMBOLS



INTEGRATED CIRCUITS_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________


CIRCUIT MODELLING

When designing electronic circuits the correct operation of the circuit has to be tested before manufacture. The figure below shows two ways of testing a circuit.

b. List three advantages of using computer simulation and three advantages of using prototype bread boarding to test and model electronic circuits.

(i) Advantages of computer simulation

c. Advantages of prototype bread boarding


Testing of a circuit through computer simulation

Testing of a circuit by ‘Bread-boarding’.

1.……………………………………………………………………………………

2. .……………………………………………………………………………………

3. .……………………………………………………………………………………

1.……………………………………………………………………………………

2. .……………………………………………………………………………………

3. .……………………………………………………………………………………


Types of circuit boards


BREADBOARDS________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

STRIPBOARDS________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

PCB (PRINTED CIRCUIT BOARDS)________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________


INVESTIGATING THE ASTABLE CIRCUIT

Study the electronic circuit diagram below. Identify and describe the function of the components A to I in the circuit and suggest what this circuit might be used for.

Name of component

Function of component

A

B

C

D

E

F


A

BC

F

EG

D

H

I


G

H

I

b. Name the three components that make up the timing part of the circuit.

c. Complete the following statements by selecting the answer from the list of components below:

Transistor Thyristor Diode Light Dependant Resistor

Capacitor Thermistor FET

i) A ……………………………………………… conducts current in one direction only.

ii) A ……………………………………………… has a drain, gate and source.

iii) A ……………………………………………… is used to detect temperature.

d. Indicate pin 3 and pin 7 on the 555 timer IC shown below:


1. …………………………………………………………………………….

2. …………………………………………………………………………….

3. …………………………………………………………………………….


e. Name two ways in which Pin 1 of the 555 timer IC, shown below, could be identified.

f. Name two ways in which the Cathode can be identified on an LED (light emitting diode).

g. Using notes and sketches, describe how you could stop the two legs of an LED from touching and explain why this is important.


1.…………………………………………………………………………………………………………2. .…………………………………………………………………………………………………………………

1.…………………………………………………………………………………………………………2. .…………………………………………………………………………………………………………………


Study the circuit diagram shown below,

a. Circle the correct name for this type of circuit

MONOSTABLE ASTABLE BISTABLE

b. Name the two components that make up the timing part of the circuit

c. What is meant by the term ‘Polarised’?

…………………………………………………………………………………………………..

…………………………………………………………………………………………………..


1.………………………………………………………………………………

2..……………………………………………………………………………


d. Identify and list THREE polarised components from the above circuit.

1. ……………………………………………………………………………

2. ……………………………………………………………………………

3. ……………………………………………………………………………

e. When connecting a battery snap to a PCB the red wire is the ………………………connection. The black wire is the ……………………… connection.



PCB STAGES OF MANUFACTURE

a. The images below show the stages in manufacturing a PCB in a school workshop. Write a short explanation to accompany the image for each of the stages. Include any safety precautions, which should be taken i.e. when using ‘developer’ and the ‘etching solution’?


………………………………………………………………………………………

………………………………………………………………………………………

………………………………………………………………………………………

………………………………………………………………………………………

………………………………………………………………………………………

………………………………………………………………………………………

………………………………………………………………………………………

………………………………………………………………………………………



555 Astable Counter Prototyping Experiment

Task ____________________________________________________________________________________________________________________________________________

Method _____________________________________________________________________________________________________________________________________________________________________________________________

Equipment / Materials / Components_____________________________________________________________________________________________________________________________________________________________________________________________




Findings / Results / Problems /Conclusions___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

INSERT PICTURE OF BREADBOARD HERE




METHOD OF MANUFACTURE_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Photographs of manufacture


UNIT 19UNIT 19


ASSIGNMENT TWOASSIGNMENT TWO

ELECTRONIC COMPONENTS & CIRCUITELECTRONIC COMPONENTS & CIRCUIT CONSTRUCTIONCONSTRUCTION


This assignment covers P3, P4, P5 & M1 of unit 19

CompleteY/N ASSESSOR FEEDBACK

TASK 1P3

TASK 2P5

TASK 3P4

TASK 4P5

TASK 5M1

NAME…………………………………………………………………………….


TASK 1

Write a description for each of the electronic components given below; your description should briefly explain what the component is and an example of its use within a simple circuit.

Component Symbol Component Function

Power Cell

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LED

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Resistor

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Capacitor

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Diode

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PTM Switch

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Transistor

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Integrated Circuit

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TASK 2

The images below show the main three types of circuit board used in Electronic Circuit Construction. In the space provided write a description that illustrates how that type of circuit board is used


STRIPBOARD

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….

BREADBOARD

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….

PRINTED CIRCUIT BOARD

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….


TASK 3

Study the electronic circuit diagram below. Identify and describe the function of the components A to I in the circuit and suggest what this circuit might be used for.

Name of component

A

B

C

D

E

F


A

BC

D

FE


TASK 4

The images below show the stages in manufacturing a PCB in a school workshop. Write a short explanation to accompany the image for each of the stages. Include any safety precautions, which should be taken i.e. when using ‘developer’ and the ‘etching solution’?


………………………………………………………………………………………

………………………………………………………………………………………

………………………………………………………………………………………

………………………………………………………………………………………

………………………………………………………………………………………

………………………………………………………………………………………

………………………………………………………………………………………

………………………………………………………………………………………


TASK 5

Describe the advantages and disadvantages of a method used to design and construct an electronic circuit safely


……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………


UNIT 19UNIT 19


MODULE THREEMODULE THREE

ELECTRONIC CIRCUIT TESTING TECHNIQUES



THE MULTIMETER

A meter is a measuring instrument. A multimeter is used to make various electrical measurements, such as AC and DC voltage, AC and DC current, and resistance and possibly some additional ones as well, into a single instrument.

Complete the diagram below by adding an short explanation that illustrates what each section of the multimeter is used to test;



In the space provided below, explain how the value of the resistor can be measured using a multimeter as shown.

State all necessary precautions which should be taken when using this instrument on this test


…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………


The diagram below shows a prototype board set up for the measurement of current. Note that the current must flow through the multimeter (which is set to read current A) in order to reach the circuit.

a. Using circuit wizard, create the test as shown above.b. Measure the current through the circuit with all three resistors (of value 1K each) in place as shown above.

Record your findings in the table below.c. Remove resistor R3 and record your findings in the table belowd. Remove resistor R2 and record your findings in the table belowe. Explain what happens to the current value as the resistance in the circuit is decreased

TOTAL RESISTANCE CURRENT (mA) EXPLANATION

3K (all resistors in circuit)

2K (R3 removed)

1K (R3 & R2 removed)



The diagram below shows a prototype board set up for the measurement of voltage. Note that the volt meter must be connected across the resistor for voltage measurement.

a. Using circuit wizard, create the test as shown above.

b. Measure the voltage across the resistors with both resistors of value 1K each. Record your findings in the table below.

c. Change the values of resistors R1 and R2 as shown in the table below and record your findings

RESISTOR VALUE R1 RESISTOR VALUE R2 Voltage (V)1K 1K1K 10K1K 100K


R2

R1

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