Electronics. Module Descriptor

Transcription

1 The Further Education and Training Awards Council (FETAC) was set up as a statutory body on 11 June 2001 by the Minister for Education and Science. Under the Qualifications (Education & Training) Act, 1999, FETAC now has responsibility for making awards previously made by NCVA. Module Descriptor Electronics Level 4 C

2 1 Title Electronics 2 Code C Level 4 4 Value 1 credit 5 Purpose This module introduces the learner to electronics. It is designed to provide the learner with the appropriate skills to interpret, construct and evaluate basic electronic circuits.. 6 Preferred Entry Level Level 3 Certificate or Junior Certificate or equivalent 7 Special Requirements None 8 General Aims Candidates who successfully complete this module will: 8.1 understand the role of a range of electronic components and their functions when combined in basic circuits 8.2 build basic electronic circuits 8.3 explain and modify the operation of basic electronic circuits 8.4 use test equipment to measure values and carry out calculations on electronic components in circuits 8.5 develop safe working practices 8.6 develop manual dexterity and acquire skills in using hand tools. 1

3 9 Units Specific Learning Outcomes are grouped as six Units. 1 Electronic Components 2 Soldering 3 Circuit Construction 4 Current Electricity 5 Electrical Measure ment 6 Safety and Health 10 Specific Learning Outcomes Unit 1 Electronic Components The learner should be able to: 1.1 identify the following electronic components: resistor variable resistor potentiometer capacitor (different types) diode (junction) light emitting diode light dependent resistor thermistor transistor (bipolar) relay fuse integrated circuit (standard DIL e.g. 555 timer) 1.2 recognise the symbols for the components listed in describe the action of the components listed in 1.1, when each is placed in a simple circuit 1.4 interpret the resistor colour code 1.5 identify the terminals of the following components: electrolytic capacitor transistor junction diode light emitting diode 1.6 source and price components 1.7 identify a range of common switches 2

4 1.8 explain the term transducer and give examples 1.9 describe the function of a transformer 1.10 distinguish between npn and pnp transistors. Unit 2 Soldering The learner should be able to: 2.1 list the properties of solder 2.2 explain the role of flux in solder 2.3 explain the need for tinning 2.4 solder and de-solder discrete components on a stripboard 2.5 solder and de-solder wires and cables 2.6 identify the different types of boards used to hold components 2.7 use a variety of hand tools to cut and strip wires and cables 2.8 use a crimping tool to attach terminals to cables 2.9 explain the need to use heat sinks when making thermal contact 2.10 maintain soldering iron 2.11 locate dry joints. Unit 3 Circuit Construction The learner should be able to: 3.1 select appropriate components 3.2 test selected components 3.3 devise a component layout from a given circuit diagram 3

5 3.4 construct a variety of electronic circuits using discrete components on prototyping board stripboard single sided printed circuit board 3.5 explain the operation of basic electronic circuits 3.6 modify electronic circuits by replacing components 3.7 use basic fault-finding techniques. Unit 4 Current Electricity The learner should be able to: 4.1 distinguish between conductors and insulators 4.2 describe current flow through conductors by means of an appropriate analogy 4.3 explain the term electric circuit 4.4 distinguish between open and closed circuits 4.5 explain current flow using the simple atomic model 4.6 distinguish between current, potential difference and resistance 4.7 specify the units of measurement of current, potential difference and resistance 4.8 state and apply Ohm's law 4.9 distinguish between ohmic and non-ohmic devices 4.10 distinguish between a series and a parallel circuit 4.11 analyse simple resistance networks 4.12 calculate electrical power in components 4.13 distinguish between A.C. and D.C list sources of E.M.F describe the operation of a simple p.s.u. 4

6 Unit 5 Electrical Measurements The learner should be able to: 5.1 use an analogue meter to measure current and voltage 5.2 check and adjust an analogue meter for zero error 5.3 measure voltage, resistance and current using a multimeter 5.4 calculate the time constant of an RC circuit 5.5 calculate the r.m.s. value of an A.C. signal 5.6 identify the basic controls on an oscilloscope 5.7 adjust an oscilloscope to measure DC voltage AC voltage periodic time of a signal 5.8 calculate the frequency of a signal 5.9 measure the mark to space ratio of the output of a 555 stable circuit using an oscilloscope. Unit 6 Safety and Health The learner should be able to: 6.1 identify the hazards of working with electricity 6.2 follow correct procedures when operating devices connected to the mains supply 6.3 use basic first aid to deal with small burns, small cuts and electric shock 6.4 recognise common hazard signs and labels 6.5 list the duties of employers and employees as specified in the Safety, Health and Welfare at Work Act, 1989 and in the Safety, Health and Welfare at Work (General Applications) Regulations,

7 11 Assessment Summary Portfolio of Coursework 70% Written Examination 30% 11.1 Technique Portfolio of Coursework Mode Centre-based with external moderation by FETAC. Weighting 70% Components 7 assignments each with a value of 10% as follows: Assignment Title Evidence Required 1 Construct a light sensor circuit on a prototype board construction of circuit outlined on page 7 measurements and calculations as outlined on page 8 2 Construct a heat sensor circuit on a stripboard 3 Construct a constant current source on a stripboard 4 Construct a low frequency oscillator on a stripboard 5 Construct a high frequency oscillator on a printed circuit board 6 Construct a long delay timer on a printed circuit board 7 Assessor s discretion; A brief for the assignment should be designed by the Assessor in accordance with identifiable performance criteria construction of circuit outlined on page 7 measurements and calculations as outlined on page 10 construction of circuit outlined on page 7 measurements and calculations as outlined on page 12 construction of circuit outlined on page 7 measurements and calculations as outlined on page 14 construction of circuit outlined on page 7 measurements and calculations as outlined on page 16 construction of circuit outlined on page 7 measurements and calculations as outlined on page 18 The performance criteria must provide specific guidelines on the evidence to be presented for assessment and describe the standard that this work should attain. These should be available for examination by the external Authenticator. 6

8 11.2 Technique Written Examination Mode Centre-based with external moderation by FETAC. Weighting 30% Duration Format 1 hour Examination to consist of 20 short answer questions. All questions carry equal marks. 12 Performance Criteria 12.1 Portfolio of Coursework Performance Criteria for Portfolio of Coursework Assignments 1-6 must be carried out to specified standards in: construction measurements and calculations Construction Each circuit constructed for Assignments 1-6 should satisfy the following criteria: Correct components selected Assembly carried out in correct sequence Circuit diagram followed correctly Circuit is functional Testing and modifications carried out using recognised processes All processes carried out with sufficient dexterity All relevant safety procedures observed 7

9 Measurements and Calculations Assignment 1 Construct a light sensor circuit on a prototype board (use a multimeter as required) The candidate must correctly: 1. measure the supply voltage 2. measure the voltage on pin 2 3. measure the voltage on pin 3 when the LDR is exposed to bright light and shade and interpret the effect of light on the voltage on pin 3 4. measure the voltage on pin 7 when the LED is lighting 5. measure the voltage on pin 7 when the LED is off 6. measure the voltage drop across the 560Ω resistor when the LED is lighting 7. calculate the current in the 560Ω when the LED is lighting 8

10 Assignment 1 Construct a light sensor circuit on a prototype board + V ( 5-15V ) LDR 4k7 560Ω R 4k LM311 _ Note Pins 5 and 6 in the LM311 voltage comparator may be left unconnected. The LED should light when the LDR is shaded. The appropriate value of R will depend on how bright the room is. Try 1k to start with. 0 V 9

11 Measurements and Calculations Assignment 2 Construct a heat sensor circuit on a stripboard (use a multimeter as required) The candidate must correctly: 1. measure the maximum value of the voltage on pin 2 when varied with the potentiometer 2. measure the minimum value of the voltage on pin 2 when varied with the potentiometer 3. check if the voltage on pin 3 rises or falls when the thermistor is warmed 4. measure the voltage on pin 7 when the buzzer is off 5. measure the voltage on pin 7 when the buzzer is sounding 6. measure the voltage drop across the 10kΩ resistor when the buzzer is sounding 7. calculate the base current in the transistor when the buzzer is sounding 10

12 Assignment 2 Construct a heat sensor circuit on a stripboard + 12V 4k7 3k9 1k 100k 1k _ LM k ZTX 300 Thermistor n.t.c. 4k7 e.g. RS or Farnell t o 3k9 0 V Buzzer 12V Note On the LM311 connect pin 8 to 12V, pin 1 to 0V, pin 4 to 0V, pin 6 to 0V. Pin 5 and 6 may be left unconnected. The buzzer sounds when the thermistor is warmed gently (no need for matches!). The potentiometer will need to be adjusted to set the temperature at which the circuit trips. 11

13 Measurements and Calculations Assignment 3 Construct a constant current source on a stripboard (use a multimeter as required) The candidate must correctly: 1. measure V R short the output terminals when making the measurement 2. measure the output current for 0Ω (short) load 3. measure the output current for 22Ω load 4. measure the output current for 100Ω load 5. measure the output current for 220Ω load 6. measure the output current for diode ( forward biased) load. 7. calculate the constant current output using the formula I = V R /R 12

14 Assignment 3 Construct a constant current source on a stripboard +12V IN 7805 OUT R + 1µF COM V R LOAD ma OV - Note The 7805 is a voltage regulator I.C. It is designed to keep the OUT pin 5V above the COMMON pin Use R = 100Ω 13

15 Measurements and Calculations Assignment 4 Construct a low frequency oscillator on a stripboard (use a stopwatch as required) The candidate must correctly: 1. measure the mark i.e. the length of time the LED is on 2. measure the space i.e. the length of time the LED is off 3. measure the period 4. calculate the frequency 5. calculate the mark/space ratio 6. calculate the period (T) using the formula T = 0.7 (R A +2R B )C 7. compare the different values obtained for the period and suggest possible reasons for the difference 14

16 Assignment 4 Construct a low frequency oscillator on a stripboard + 12 V R A R B 560Ω C Note Pin 5 may be left unconnected C=100µF R A =22k R B =47k The LED should flash slowly 0 V 15

17 Measurements and Calculations Assignment 5 Construct a high frequency oscillator on a printed circuit board (use an oscillator as required) The candidate must correctly: 1. measure the mark 2. measure the space 3. measure the period 4. calculate the frequency 5. calculate the mark/space ratio 6. calculate the space using the formula: SPACE = 0.7R B C 7. observe the waveform on pin 2 and reproduce this waveform on graph paper. 16

18 Assignment 5 Construct a high frequency oscillator on a printed circuit board + 12 V R A R B output V C Note Pin 5 may be left unconnected. C=10nF R A =10k R B =10k Use an oscilloscope to observe the square wave at the output 17

19 Measurements and Calculations Assignment 6 Construct a long delay timer on a printed circuit board (use a stopwatch, an oscilloscope and multimeter as required) The candidate must correctly 1. measure the time delay (T) in seconds for the red LED to come on when the switch is pushed 2. calculate the time delay (T) using the formula: T = 2736R T C T 3. measure the period of the signal on pin 13, using an oscilloscope 4. measure the voltage across the 220Ω resistor when the green LED is lighting 5. measure the time delay when R T is changed to 10kΩ 6. calculate the current in the green LED when it is lighting 7. Observe the waveform on pin 13 (when R T = 10kΩ) and reproduce this waveform on graph paper. 18

20 push to make Assignment 6 Construct a long delay timer on a printed circuit board 0 start timing 10 nf V R T 13 2 ZN C T 0 V D1 D2 220Ω 0 V NOTE D1 (red) ON timing over D1 (green) ON timing in progress Pins 5, 6, 8, 9, 10 may be left unconnected Use R T = 1M Ω Use C T = 1µF 19

21 Assignment 7 (Assessor s discretion) The performance criteria are to be devised by the Assessor and available for examination by the external Authenticator. 13 Grading Pass 50-64% Merit 65-79% Distinction % 20

22 Individual Candidate Marking Sheet Electronics (C10016) Portfolio of Coursework Candidate: PPSN: Performance Criteria MAXIMUM MARK Assignment 1: Construct a light sensor circuit Construction 16 Calculations and measurements (7 x 2marks) 14 Assignment Total 30 Assignment 2: Construct a heat sensor circuit Construction 16 Calculations and measurements (7 x 2marks) 14 Assignment Total 30 Assignment 3: Construct a constant current source Construction 16 Calculations and measurements (7 x 2marks) 14 Assignment Total 30 Assignment 4: Construct a low frequency oscillator Construction 16 Calculations and measurements (7 x 2marks) 14 Assignment Total 30 Assignment 5: Construct a high frequency oscillator Construction 16 Calculations and measurements (7 x 2marks) 14 Assignment Total 30 Assignment 6: Construct a long delay timer Construction 16 Calculations and measurements (7 x 2marks) 14 Assignment Total 30 Assignment 7: ( Assessor devised ) CANDIDATE MARK SUBTOTAL Assignment Total 30 Portfolio of Coursework TOTAL 210 Weighted Total (=Total 3) 70% Assessor s Signature: Date: External Authenticator s Signature: Date: 21

23 Individual Candidate Marking Sheet Electronics (C10016) Written Examination Candidate: PPSN: Performance Criteria MAXIMUM MARK CANDIDATE MARK 20 questions to be answered (5 marks per question) 100 TOTAL 100 WEIGHTED TOTAL (=TOTAL X 0.3) 30% Assessor s Signature: Date: External Authenticator s Signature: Date: 22

24 FETAC Module Results Sheet Module: Electronics Module Code: C10016 Elements of Assessment Portfolio of Coursework Written Examination Total Marks Maximum Marks per element of assessment 70% 30% 100% Grade* Candidate Name Exam No Signed: Teacher/Assessor: Date: This sheet is for teachers/assessors to record the overall marks of individual candidates. It should be retained in the centre. The marks awarded should be transferred to the official FETAC Module Results Sheet issued to centres before the visit of the external Authenticator. Grade* D: % M: 65-79% P: 50-64% U: 0-49% W: students who did not present for examination 23