Overview of experiments and projects

Pathways: ExperimentsExperiment EE ECE Media Eng

D: Op Amps 1 1

F: Digital Communications 1 1 1

S: Pulses and Bandwidth 1

J: Transformers 1

K: Wave Propagation 1

Software Project (Linux) 4

Loudspeaker Response 1

Audio-Visual Production Project 5

Acoustic Noise Measurement 1

Room Impulse Response 1

FM Receiver Project 5 5

Location of Labs In the main Elec Eng UG laboratories or the Tels Lab

Op-Amps Digital Communications Pulses and Bandwidth Transformers Wave Propagation Software Project FM Receiver Project

In the Media Lab Loudspeaker Response Audio-Visual Production Project Acoustic Noise Measurement Measurement and processing of room impulse responses

Lab Web Page Web Page http://info.ee.surrey.ac.uk/Teaching/Courses/ee2.labb/

Online lab manual Videos about experiments

Timetables, group lists etc.

Experiments not in the lab manual, only on web Software Project

Loudspeaker Response

Audio-Visual Production Project

Acoustic Noise Measurement

Remote Access to Web Page Access to some parts only via university IP address

Copyright issues with some material

Use http://remote.surrey.ac.uk when off-campus

FM Receiver Project Objective

Create a prototype FM receiver

Basic design

PIC controls

FM Receiver Chip

LCD Display

Programme PIC in C using MPLAB

Work in groups of 3-4

FM Receiver: System OverviewDevelopment

Platform

Debugger

Serial Converter Microcontroller

PIC18LF6490

Tuner /

DemodulatorAudio

Amplifier

Frequency Readout

LCD Display

Channel Change

Push Buttons

Antenna

D1: Operational Amplifier Objectives/aims

Investigate non-ideal properties of op-amps Bias current, offset voltages, slew rate, etc. Gain vs. frequency plots Integrators

Preparation tips Study Clayton book in particular Look at data sheet for 741 op-amp Try some example calculations using data sheet values, particularly

for part 1 Sketch out the circuits required Predict the results, sketch some example graphs Briefly describe necessary experiment steps – instructions do not

say absolutely everything

Experiment Part 1•Find offset voltage, bias currents using circuits like this one

•Too small to measure directly

•How?

•Try putting values from the data sheet into equations (a),(b),(c)

•Are some values much smaller than others?

Experiment Part 1 Measure gain and

frequency response

How do different Rfvalues change the response?

How to use log-linear graph paper?

How to find cut-off frequency?

J: Transformers Objectives/aims – Learn…

The construction of low frequency transformers The relationship between magnetic flux, induced EMF and

magnetising current The idea of a magnetic circuit The limitations of iron as a magnetic material One of the simplest equivalent circuits for the transformer Sources of loss in a transformer and the effect of frequency on the

relative magnitude of these losses

Preparation tips Basic transformer principles – try Wikipedia? Books are usually better… Read material in lab manual Answer questions in lab manual Predict results

Transformers: Method Goal

Design secondary winding to give exactly 6A in the 0.11Ω load resistor, with the primary voltage adjusted to exactly 12V

First

Analysis of transformer

See video for more details

Transformers Video

K: Wave Propagation Aims/objectives

Study standing waves in

Coaxial cable

Waveguide

Free space

Learn about standing wave and transmission theory

Preparation

Read suggested reading material

Answer questions in lab manual

Part b: Waveguide

Gunn Diode Source

Cavity Wave Meter

Crystal Detector

Variable Attenuator Crystal Detector*

To CRO

Standing wave detector

Load

To CRO

S: Pulse And Wide Bandwidth Measurements Aims/objectives

Demonstrate loading and mis-match problems associated with oscilloscope leads and probes

Show the effect of parasitic resonances in decoupling circuits.

Observe the variation in "ground" potential at different points on a PCB

Preparation

Answer questions

May be able to predict some results based on theory

F: Digital Communications Aims/objectives

Familiarise you with some of the concepts and problems involved in transmitting digital data from a remote transmitter to a receiver

Familiarisation Different pulse shapes, effects of filtering pulse

Covers material not in telecoms lectures

Preparation Lab manual specifies exercises

Equipment manual contains exercise details Available online via web page, also in labs

Preparation as specified in lab manual

Group Software Design Project: Online publications database Aims/objectives Implement a publications database Record and display summary of university conference and

journal publications

Work in teams (3-5 people)

Learn about MySQL, Perl, CGI

Final technical report

Preparation Read web page, follow links

MySQL reading

Look for example publication databases on the web

S4: Loudspeaker Frequency Response Objectives/aims Determine the frequency response of a loudspeaker use recordings of the voltage and current, and sound pressure

using a measurement microphone

Observe the resonant properties of the loudspeaker enclosure, and account for these in the loudspeaker response measurements

Preparation Read experiment instructions

Can you predict results?

How does the Matlab script work?

S5: Audio Distortion Measurements Aims/objectives

To characterise an audio processing algorithm using various audio distortion measurements

To gain familiarity with frequency representations of audio

Preparation

Read experiment and “required reading”

Study matlab scripts

Predict results

Summary Experiments likely to start in week 1

Keep checking your e-mail, lab web page for updates

Printed manual provided in week 1

All material will be placed online during Xmas holidays

All labs located in main L2 labs

Apart from Media Eng experiments

Lab groups should be same as previous semester

Check web page for updates