Unit 8 Scheme of Work
Unit introduction
Learning aim A: Know about electronic systems design
Topic A1: Input componentsIdentification, function and application of input components used in electronic circuits, including:

  • light dependent resistor (LDR)
  • thermistor (negative temperature coefficient – NTC)
  • moisture sensor
  • piezoelectric sensor.

Identification, function and application of input components used in electronic circuits, including:

  • switches – toggle, slide, rocker, push-to-make, push-to-break, key, micro, tilt
Topic A2: Process components
Identification, function and application of process components used in electronic circuits, including:

  • transistor (NPN and PNP)
  • Darlington Pair
  • Thyristor
  • field effect transistor (FET).

Identification, function and application of process components used in electronic circuits, including:

  • 555 timer – in monostable and astable modes
  • operational amplifier (Op-Amp)
  • Peripheral Interface Controllers (PICs): how to program PICs using flowcharts to switch outputs on and off from input signals, create routines to control outputs with delays, and repeat loops and counts.
Topic A3: Output components
Identification, function and application of output components used in electronic circuits, including:

  • lamp/bulb
  • buzzer
  • light emitting diode
  • loudspeaker
  • motor
  • 7-segment display.
Topic A4: Passive components
Identification, function and application of passive components used in electronic circuits, including:

  • fixed resistor (including resistor colour code and British Standard BS 1852/BS
    EN 60062), coding method to determine resistor values and tolerance

variable resistor.

Identification, function and application of passive components used in electronic circuits, including:

  • polarised capacitors
  • non-polarised capacitors
  • diode – used as a protective device against back voltage from electromagnetic components
  • relay – used as an interface between primary and secondary circuits.
Topic A5: Power
Power supplies, units of measurement and calculations for electronic circuits.Identification, characteristics, application and advantages/disadvantages of power supplies used in some electronic circuits, including:

  • batteries – zinc-carbon, alkaline, NiCad rechargeable, button cells
  • low-voltage power supply units – PSUs

solar power – when powering low-current circuits.

Units of measurement:

  • current (amp)
  • resistance (ohm)
  • voltage (volt)
  • power (watt).

Application of the units and formulae when calculating values relating to electronic circuits, including:

  • simple calculations:

Ohm’s law – V = I x R in parallel circuits consisting of two resistors

resistors in series – Rtotal = R1 + R2 + R3 etc.

time period – t = R x C

power – W = I x V

  • complex calculations:

Ohm’s law – V = I x R in series circuits consisting of two resistors

resistors in parallel – Rtotal = (R1 x R2)/(R1 + R2).

Assignment 1
Tasks for 2A.P1, 2A.P2, 2A.M1 and 2A.D1Use centre-devised assignment.
Learning aim B: Design and construct electronic circuits using electronic building blocks
Topic B1: Circuit design
Design an electronic circuit using input, process and output components, for example:

  • a low temperature alarm that will give a warning when the temperature falls below
    a pre-set level, including:

    • input – thermistor and fixed/variable resistor
    • process – single transistor/Darlington Pair/
      Op-amp

output – buzzer/LED/lamp.

Design an electronic circuit using input, process and output components, for example:

  • a timing circuit that gives a flashing LED or pulsing sound output after a set time period, including:
    • input – capacitor and variable resistor
    • process – 555 timer (monostable), 555 timer (astable)

output – LEDs/loudspeaker.

Design an electronic circuit using input, process and output components, for example:

  • a circuit to count people passing through a sports stadium barrier, including:
    • input – push-to-make switch and fixed resistor
    • process – programmed PIC
    • output – 7 segment display.
Topic B2: Circuit board construction
Applications, advantages/disadvantages and construction of a circuit using an appropriate circuit board, including:prototyping board (breadboard).Applications, advantages/disadvantages and construction of a circuit using an appropriate circuit board, including:stripboard (veroboard).

Applications, advantages/disadvantages and construction of a circuit using an appropriate circuit board, including:

printed circuit board (PCB).

Applications, advantages/disadvantages and construction of a circuit using an appropriate circuit board, including:

  • mass production, miniaturisation and surface mount technology (SMT).
Assignment 2
Tasks for 2B.P3, 2B.M2 and 2B.D2Use centre-devised assignmentAlternatively, use the authorised assignment from Edexcel: Electronic Timer Design and Prototyping
Learning aim C: Know how to populate circuit boards permanently and construct electronic circuits safely
Topic C1: Circuit soldering techniques
Use appropriate techniques for soldering components into an electronic circuit and dealing with exposed component legs, including:soldering using multi-core lead-free soldering technique to avoid dry joints.Use appropriate techniques for soldering components into an electronic circuit and dealing with exposed component legs, including:tinning component legs and multi-strand wire using heat sinks and shunts.

Use appropriate techniques for soldering components into an electronic circuit and dealing with exposed component legs, including:

  • using IC sockets and heat shrink sleeving or insulation tape.
Topic C2: Risk assessments
Specify risks and control measures appropriate to the engineering activity (handling soldering equipment), including:

  • identifying hazards
  • deciding who might be at harm and how
  • evaluation of the risks and appropriate control measures

recording of findings and implementation.

Full Health and Safety Executive (HSE) risk assessment

Assignment 3
Tasks for 2C.P4, 2C.P5, 2C.M3, 2C.M4 and 2C.D3
Use centre-devised assignment
Learning aim D: Test and evaluate electronic circuits
Topic D1: Testing electronic circuits
Testing and evaluating electronic circuits to check voltage levels, continuity and current, and to identify and diagnose faults, including use of:
a voltmeter or multimeter to measure voltage levels across components and power supplies in a circuit.Testing and evaluating electronic circuits to check voltage levels, continuity and current, and to identify and diagnose faults, including use of:
an ohmmeter or multimeter to check for continuity in circuit tracks and wires, and to detect breaks and bridges in connections.Testing and evaluating electronic circuits to check voltage levels, continuity and current, and to identify and diagnose faults, including use of:
an ammeter or multimeter to measure current levels in a circuit.Testing and evaluating electronic circuits to check voltage levels, continuity and current, and to identify and diagnose faults, including use of:

  • a logic probe to test digital signal levels when using PICs.
Assignment 4 Tasks for 2D.P6, 2D.P7, 2D.M5 and 2D.D4

Use centre-devised assignment

TOTAL: 60 hours

Unit No.
& TitleAssignment No.
& TitleLearning AimAssessment CriteriaHand Out DateFormative Feedback DateHand In Date Unit 8: Electronic Circuit Design and ConstructionElectronic systems design, power supplies and calculating valuesA: Know about electronic systems design2A.P1
2A.P2
2A.M1
2A.D127/2/15 13/3/15

Assessment Plan
Programme Number & Title Edexcel BTEC Level 1/Level 2 First Award in Engineering
Assessor Name Mr J DINNEN IV Name Miss S BETHWAITE
Unit 2 : Investigating an engineered product 1:technical specification criteria for an engineered product A: understand the performance requirements of an engineered product 2A.P1
2A.M1
10/9/14 19/9/14 24/9/14
Unit 2 : Investigating an engineered product 2:Materials used in an engineered product B: Understand the selection of specific materials for the use in the components that make up an engineered product. 2B.P2
2B.M2
2B.D1
24/9/14 3/10/14 16/10/14
Unit 2 : Investigating an engineered product 3:Manufacturing Processes for an engineered product C: Understand the selection and use of manufacturing processes in an engineered product. 2C.P3
2C.M3
2C.D2
16/10/14 5/11/14 12/11/14
Unit 2 : Investigating an engineered product 4: Quality issues for an engineered product D: Understand the quality issues related to an engineering product. 2D.P4
2D.P5
2D.M4
2D.D3
12/11/14 26/11/14 17/12/14
Unit 1 THE ENGINEERED WORD 14/1/15
Unit 8: Electronic Circuit Design and Construction Electronic timer design B: Design and construct electronic circuits using electronic building blocks 2B.P3
2B.M2
2B.D2
17/3/15 31/3/15
Unit 8: Electronic Circuit Design and Construction Designing a permanent circuit C: Know how to populate circuit boards permanently and construct electronic circuits safely 2C.P4
2C.P5
2C.M3
2C.M4
2C.D3
20/4/15 11/5/15
Unit 8: Electronic Circuit Design and Construction Checking circuit function D: Test and evaluate electronic circuits 2D.P6
2D.P7
2D.M5
2D.D4
13/5/15 15/6/15

 

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