Unit 19: Electronic Devices and Circuits - Pearson BTEC Level 3 National Extended Diploma in Engineering

Learning aim: Explore the safe operation and applications of analogue devices and circuits that form the building blocks of commercial circuits

Analogue electronic devices and circuits

You have been offered your first job as a Junior Technician in a local company that specialises in repairing domestic electronic equipment.

As part of your new role the owner would like to provide opportunities for you to develop your skills and knowledge of electronic devices and circuits.

They would like you use a range of test equipment and software to investigate commonly used analogue electronic devices and the type of circuits in which they are used. They have asked you keep accurate records of everything you do so that you can refer to them later as you build up your skills and knowledge base.

Task 1: Carry out theoretical and practical investigations into analogue devices and circuits.

You need to investigate:

a. Diodes and how they are used in a full-wave rectified power supply with voltage regulation

b. Transistors and how they are used in a stabilised common emitter amplifier

c. Operational amplifiers and how they are used in an amplifier circuit

You need to provide evidence that you have consistently worked safely in accordance with relevant risk assessments.

To do this you will need to work systematically following the guide below:

a. Diode circuits

i. identify different types of diode and their uses
ii. construct a schematic diagram and simulate the operation of a diode as a half-wave rectifier
iii. develop the circuit schematic and simulation to a full- wave rectifier with capacitor smoothing and Zener diode voltage regulation.
iv. build a prototype of your final circuit
v. record the output voltage
vi. estimate the voltage ripple for different loads
vii. compare the results from theory, simulation and measurement

b. Transistor circuits

i. identify different types of transistor and their uses
ii. construct the schematic circuit of a common emitter amplifier in your ECAD package.
iii. use the schematic to simulate the behavior of the circuit with a low voltage sine wave input signal of frequency 1kHz. Adjust the amplitude of the input voltage to give the largest undistorted output voltage.
iv. investigate how the voltage gain changes with frequency between 1kHz and 1MHz.
v. build a prototype of the final circuit and measure the voltage gain for the same frequency range.
vi. compare the results from theory, simulation and measurements

c. Operational amplifier circuits

i. identify the pin-out of an operational amplifier and relate it to the schematic diagram
ii. simulate inverting and non-inverting amplifier applications of an operational amplifier, noting the effect of resistor values on the voltage gain.
iii. construct the schematic diagram of a non-inverting amplifier with gain [specify for learner]
iv. simulate the gain at frequencies between 1kHz and 1MHz
v. build a prototype circuit and measure the voltage gain over the same range of frequencies
vi. compare the results from theory, simulation and measurements.

Attachment:- Electronic Devices and Circuits.rar