BTEC National Diploma in Engineering

Unit 35

Principles and Applications of Electronic Devices and Circuits

Unit Name and Number Student Assessor

Task book issue date Completion date (pass outcomes) Learner Signature

The following grid gives details of the submission and referral deadlines for each of the pass outcomes listed. The deadline for each outcome will be indicated in the same box as the outcome criteria.

Outcomes included in this task bookTasks are ordered in accordance with the outcomes listed

Submitted

(Date)

Achieved?

(Sign and date)

Referred

(Resubmit by?)

Re-submitted

(Date)P1Explain the purpose of two different types of diode, each in a different electronic circuit applicationDeadline:Module Week 4

P2Explain the operation of two different types of transistor one in an analogue and one in a digital circuitDeadline:Module Week 4P3Explain the operation of three different logic gates with appropriate gate symbols, truth tables and Boolean expressionsDeadline:Module Week 6

P4Build and test two different types of analogue circuit using operational amplifiersDeadline:Module Week 7P5Build and test a combinational logic circuit that has three input variables

Deadline:Module Week 8P6Build and test a sequential circuit using integrated circuit(s)Deadline:Covered in induction

P7Use a computer software package to simulate the construction and testing of an analogue circuit with three different types of componentsDeadline:Module Week 10P8Use a computer software package to simulate the construction and testing of a digital logic circuit with three gates.Deadline:Module Week 10

M1Modify an existing analogue circuit to achieve a revised specification by selecting and changing the value of one of the componentsDeadline:By the end of the moduleM2Modify a digital circuit to achieve a revised specification by selecting and changing up to two logic gates.Deadline:By the end of the moduleM3Evaluate and minimise a three input combinational logic circuit containing three gates.Deadline: By the end of the module

D1

Using a simulation package, analyse the effects of changing the values of circuit parameters on the performance of an analogue circuit containing an operational amplifier or transistors.Deadline:By the end of the module

D2Compare and contrast two different types of logic family with reference to five characteristics

Deadline:By the end of the module

Learner Declaration

I confirm that the work submitted to complete the given tasks is my own. I have indicated where research and other resources have been used to confirm the conclusions reached within the submission and listed those resources in a bibliography

Sign and date for each task

P1 P2 P3 P4

P5 P6 P7 P8

M1

M2 M3 D1 D2

Task 1 (P1 & P2)

For all tasks use diagrams, illustrations and graphs as appropriate.

Tasks for P1

1N4001 Diode

1. Briefly explain the function of a diode in forward and reverse bias mode

2. What is the purpose of the 4 diodes outlined in red in the circuit, and what is this configuration known as?

3. Do the diodes operate in forward or reverse bias mode?

Generic 5 volt Zener

1. Briefly explain the difference between a general purpose diode and a zener diode

2. What is the normal mode of operation for a zener diode?

3. Briefly explain the purpose of the zener diode in this circuit.

Tasks for P2

BC109

1. What type of transistor is the BC109?

2. Is this type of transistor a current controlled or voltage controlled device?

3. Briefly explain how the transistor operates using diagrams and graphs as appropriate

4. This transistor is connected in an emitter follower configuration, give two reasons for this

5. What type of circuit is formed by the zener diode and the BC109 transistor

6. What is the output voltage of this circuit measured from the emitter?

2N2609 P Channel FET

1. Briefly explain the difference between a bi-polar transistor and a FET using diagrams and naming terminals as appropriate

2. What is meant by the term unipolar

3. What is meant by the term ‘normally on’ and how does this relate to the FET in this circuit?

4. What is the purpose of the FET in this circuit?

Task 3 (P3)

Explain the operation of three different logic gates with appropriate gate symbols, truth tables and Boolean expressions.

For the TTL family, AND, OR and NOT gates include the following:

1. The ANSI symbol for each gate

2. The Boolean expression for each gate

3. A two input truth table for each gate, excepting the NOT gate which only has one input

4. The range of input high and low voltages which are considered legal

5. The range of output high and low voltages which are considered legal

6. A brief written explanation of how each gate functions

Task 4 (P4)

Build and test two different types of analogue circuit using operational amplifiers

Task 5 (P5)

Build and test a combinational logic circuit that has three input variables

Task 6 (P6)

Build and test a sequential circuit using integrated logic circuit(s)

Task 7 (P7)

Use a computer software package to simulate the construction and testing of an analogue circuit with three different types of components.

This requires that you choose either of the op amp circuits for P4 and use Multisim to simulate and prove the operation of the circuit.

As evidence you should provide:

1. A fully annotated screen dump of the simulated circuit

2. Oscilloscope or grapher screen dumps showing the input and output waveforms to and from the circuit.

Task 8 (P8)

Use a computer software package to simulate the construction and testing of a digital logic circuit with three gates.

This requires you test the traffic light circuit using Multisim. This should prove that your design works as intended and should be completed before the physical construction of the

circuit begins.

As evidence you should provide:

1. A screen dump of the completed circuit which is fully signposted and annotated as appropriate.

2. A screen dump of the output of each of the three LED’s compared with the output of the 74LS93 counter. This is best accomplished using the logic analyser in the

program.

Task 9 (M1)

Modify an existing analogue circuit to achieve a revised specification by selecting and changing the value of one of the components.

1. Using the either op amp circuit from P4 select and change a component to achieve a revised specification. Note it is not enough to merely change a component and

observe a change in circuit behaviour. To achieve this outcome you must explain how and why changing the component changes the circuit specification.

Task 10 (M2 & M3)

M2 Modify a digital circuit to achieve a revised specification by selecting and changing up to two logic gates.

M3 Evaluate and minimise a three input combinational logic circuit containing three gates

To achieve this outcome you are required to modify the original traffic light circuit so that the counter controls two sets of traffic lights so that for example when one set of traffic

lights shows red, the other shows green thus avoiding crashes and accidents.

You must provide the following:

1. A truth table showing the output states of both sets of traffic light

2. The full Boolean expressions for all of the output states

3. A full set of K maps showing how each of the output states was minimised

4. A screen dump of the completed circuit

5. A screen dump showing the output of all six LED’s compared with the output of the 74LS93 counter

Task 11 (D1)

Using a simulation package analyse the effects of changing the values of circuit parameters on the performance of an analogue circuit containing an operational amplifier or

transistors.

You could use either the amplifier circuit from P4 or the power supply circuit from P1/P2 to accomplish this task. You need to:

1. Simulate either circuit

2. Change various parameters for example the frequency and amplitude of the input signal to the amplifier

3. Explain the change in circuit behaviour with reference to theory

Task 12 (D2)

Compare and contrast two different types of logic family with reference to five characteristics.

Compare TTL with CMOS with respect to the following:

1. Power supply ranges

2. Legal input and output voltages

3. Power requirements related to frequency

4. Propagation delay

5. Fan out