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
book
Tasks are ordered in accordance
with the outcomes listed
P1
Explain the purpose of two
different types of diode, each in
a different electronic circuit
application
Deadline:
Module Week 4
P2
Explain the operation of two
different types of transistor one
in an analogue and one in a
digital circuit
Deadline:
Module Week 4
P3
Explain the operation of three
different logic gates with
appropriate gate symbols, truth
tables and Boolean expressions
Deadline:
Module Week 6
P4
Build and test two different
types of analogue circuit using
operational amplifiers
Deadline:
Module Week 7
P5
Build and test a combinational
logic circuit that has three input
variables
Submitted
Achieved?
Referred
Re-submitted
(Date)
(Sign and date)
(Resubmit by?)
(Date)
Deadline:
Module Week 8
P6
Build and test a sequential circuit
using integrated circuit(s)
Deadline:
Covered in induction
P7
Use a computer software
package to simulate the
construction and testing of an
analogue circuit with three
different types of components
Deadline:
Module Week 10
P8
Use a computer software
package to simulate the
construction and testing of a
digital logic circuit with three
gates.
Deadline:
Module Week 10
M1
Modify an existing analogue
circuit to achieve a revised
specification by selecting and
changing the value of one of the
components
Deadline:
By the end of the module
M2
Modify a digital circuit to achieve
a revised specification by
selecting and changing up to two
logic gates.
Deadline:
By the end of the module
M3
Evaluate 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
D2
Compare 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.
2.
3.
4.
5.
6.
What type of transistor is the BC109?
Is this type of transistor a current controlled or voltage controlled device?
Briefly explain how the transistor operates using diagrams and graphs as appropriate
This transistor is connected in an emitter follower configuration, give two reasons for this
What type of circuit is formed by the zener diode and the BC109 transistor
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.
2.
3.
4.
5.
6.
The ANSI symbol for each gate
The Boolean expression for each gate
A two input truth table for each gate, excepting the NOT gate which only has one input
The range of input high and low voltages which are considered legal
The range of output high and low voltages which are considered legal
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.
2.
3.
4.
5.
A truth table showing the output states of both sets of traffic light
The full Boolean expressions for all of the output states
A full set of K maps showing how each of the output states was minimised
A screen dump of the completed circuit
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