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EE4446
Audio Group
Project Overview
 Breakdown of groups
 Quick overview of progress
 Current activities
 What remains to be done
4 Subgroups
 Power Supply Group
 Preamplifier Group
 Equalizer Group
 Power Amplifier Group
Circuit Selection
 All circuits have been selected.
 All parts ordered and are on hand.
 All circuits are built and currently being
tested.
Initial Testing Phase
 Circuits were initially constructed on breadboards.
 All initial circuit testing was done on breadboards.
 Most testing has gone smoothly with only minor
problems.
Current Activities
 Circuits are currently being soldered into
PC Boards
 After soldering is complete, circuits will be
individually tested again to ensure proper
operation.
Final Assembly
 After PC board testing, circuits will be
merged into one complete unit.
 After merging circuits, final testing will
take place.
Current Status
 Everything is on schedule.
 Plan to do final assembly sometime with in
the next week.
 Final testing and reports with final
specifications should be done by November
25th.
POWER SUPPLY
Supply Circuitry
Group Resources
 An Huynh
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Work with the power amplifier group to design the circuit.
Research the circuit schematic to reach the requirements.
Collect the voltage requirements from the other subgroups.
Planning for the circuit design
Order and pick up parts from manufacture (Alliance Electronic, Radio
Shack, Fry’s Electronics).
Set up the circuit in lab.
Using PCB software to draw a circuit with its real dimension. (trial)
Etch the circuit board. (trial)
Testing the circuit.
Modify the circuit to increase the efficiency.
Group Resources Cont’d
 Truc Duong
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Write report, documentation for subgroup.
Research the circuit schematic with its requirements.
Pick up parts from manufacturer
Set up the circuit in lab.
Draw the circuit on PC board for etching. (trial)
Test the circuit.
Power Supply Goals
 Power supply is required to convert voltage source
AC to DC, then provide the desired voltage for the
rest of the design.
 Designing is based on the power amplifier module
that requires the most highest voltage of the
project.
 Voltage will be stepped down from different level
of voltages for the pre-amp and equalizer.
Parts List
1.
2.
3.
4.
5.
6.
7.
8.
Transformer: VPS36-2200 from Magnetek (117V / 18.5V-2A parallel or
37V series). Price: $ 20.54
Bridge Rectifier: KBPC602 from Collmer manufacture. Price: $2.62
Voltage Regulator:
LM 7805 or NTE 960 (5V). Price: $4.10
LM 7808 or NTE 964 (8V). Price: $4.03
LM 7812 or NTE 966 (12V). Price: $4.32
MC7818CT
Heat sink for Voltage regulators.
Electrolytic capacitors: 3300uF _ 35VDC.
Price: $3.89 /each x 4 = $15.56
Fuse and holder (5A). Price: $5.19
Capacitors (4-6uF) from Lab.
Power Resistors.
Schedule of Task
 Sept. 12-19 Ready part list for ordering
 Sept. 21-Oct.4 Built prototype circuit
 Oct. 4-12 Final construction of circuit
 Oct. 12-19 Circuit testing
 Oct. 21-Nov. 14 Documentation, modification and
more circuit testing
 Nov. 16-21 System demonstration
 Nov. 23-Dec. 5 Final inspections and report
Procedures
 Build the circuit which to convert from AC
to DC with a step down from 25V to 5VDC.
 Modifying and re-arranging the prototype
circuit including adding the heat sinks for
voltage regulator.
Circuit for 4 Voltage
Regulators
Problems
 Power dissipates from 25V to 12V.
 Heat sinks spacing.
 18V Voltage regulator.
Circuit With Power Resistor
Advantage and Disadvantage
 Circuit 1: using all voltage regulators.
– Advantage: good quality, noise can be controlled.
– Disadvantage: voltage regulators are expensive, and take more
spaces on PC board.
 Circuit 2: using 2 voltage regulators and 2 power resistors.
– Advantage: cheaper, reliable.
– Disadvantage: cannot control noise because we not sure how noise
is produce.
Schedule
 Review of high-level schedule milestones
Research required circuit
Order part
Build and test prototype circuit
Retest and modify circuit
Test with the other modules
Sep
Oct
Nov
Dec
Current Status
 Modifying circuit and adding heat sink.
 Building new circuit that limits the numbers
of voltage regulators by using power
resistors.
 Testing and collecting data from new
circuit.
 Comparing new and old circuit for the final
circuit design.
Preamplifier
Control Circuit
Group Resources
Toan Thai.
• Organizing subgroup, networking with group
leader and other subgroup leader.
• Researching on the internet and library
materials for project.
• Writing-up Preliminary Design.
• Building up the circuit board.
• Setting up the circuit on Lab.
Group Resources Cont’d
Rob Galloway.
• Researching on the internet and library
materials for project.
• Contacting the distributors for components of
the project.
• Rechecking Preliminary Design Write-up, the
document inspection write up.
• Setting up the circuit on the Lab.
• Simulating the circuit on Pspice.
Group Resources Cont’d
Suong Lam.
• Researching on the internet and library
materials for project.
• Rechecking Preliminary Design Write-up.
• Writing up the document inspection.
• Setting up the circuit on Lab.
• Simulating the circuit on Pspice.
Advantages of LM1036
 Offers volume control
 Offers balance control
 Offers tone control
 Tone response can be modified based on
application
 Low Cost
 Few external components required
Features of the LM1036
 9V to 16V supply voltage range
 75 dB volume control range
 ±15 dB tone control range
 Low distortion, .06%
 High signal to noise ratio, 80 dB
 Maximum performance occurs with an
input voltage of .3V rms
Pin Assignments for the
LM1036
Tone Response
.00065 1
1
ab
j Cb
Bass_Response
.00065  ab
1
j Cb
1
5500 j  1
Treble_Response
1
at  Ct
5500  j  Ct  ab
ab at 0
for maximum bass and treble boost
ab at 1
for maximum cut
Schematic of Control Circuit
Status of the Control Circuit
 Finalized Design
 Purchased Parts
 Fabricated Circuit
 Ready to Begin Testing
Equalizer
Tone Control Circuitry
Group Resources
 Eric McCullar
• Researched EQ circuitry options
• Soldered circuit to PC board
• Assembly of finished EQ circuit for
implementation
Group Resources Cont’d
 Scott Lazo
• Located chip to be used
• Soldered circuit to PC board
• Assembly of finished EQ circuit for
implementation
Group Resources Cont’d
 Chris Tribble
• Ordered EQ chip
• Soldered circuit to PC board
• Assembly of finished EQ circuit for
implementation
Group Goals
 10 band total, 5 band/channel equalizer
 Center frequencies at 100, 300, 1k, 3k, and
10kHz (both channels)
 Boost/Cut range of +/-10dB
Completed Tasks
 Developed a plan to implement
 Built EQ’s using op-amps and gyrator
circuits
 Tracked down IC-BA3823LS
 Built a preliminary model for testing
 Preliminary testing
 Began Soldering circuit onto PCboard
Unresolved Issues
 Casing/housing the EQ
 Learning how to use the audio analyzer
machine
 Further testing (calculating THD, Control
range, etc.)
 Determining boost and cut range
 Begin integration of the different
subsections
Frequency Response
Expectations:
 Cut/Boost in required
frequency band.
 Low distortion effects
from circuit.
(before & after)
 Similar response in
every selected
frequency.
Measurement Results
Cut/boost: (the good and the bad)
 Gain and reduction was realized in every band.
 Measurements reflect expected control range.
 Output followed the input.
 Experienced “unwanted” influences….
 Maximum boost creates low-end distortion.
Milestones and Schedule
 10/19/00--Tracked down IC
 10/24/00--Group meets and builds circuit on
breadboard, preliminary testing done by group
 10/27/00--Scott and Eric discuss casings and
possible implementation of LED display
 10/29/00--Group meets and begins soldering
 11/2/00--Group meets to discuss the direction of
the project
 11/6/00--Eric and Scott meet for testing
Milestones and Schedule
 11/9/00--Entire EQ circuit should be soldered into
PC board
 11/16/00--Finalize testing and begin integration
into overall system
 11/23/00--Integrating and troubleshooting
problems
 11/25/00--Systems Integration
 12/5/00—Design Configuration Due
Power Amplifier
Power Circuitry
Group Resources
 Group consists of Scott Nguyen and Andy
Gibson
 Research, design, and build the circuitry
– Internet, audio books
– Materials from Fry’s and Allied Electronics
 Use electronic lab equipment for testing
 Self-financial support, about $60
Group Goals
 Goal is to design a 68W/channel power amplifier
 <1% THD from 20-20kHz
 Module will be connected to the power supply,
pre-amp, and equalizer as a system
Milestones and Schedule
 10/12/2000 – Completed prototype circuit
 10/26/2000 – Completed the power amplifier
module
 11/21/2000 – Inter-module Connection
 11/28/2000 – Packaging and layout configuration
 12/05/2000 – Design configuration due
Design Parameters
 Use LM3886 chip for the amplifier
– Low signal to noise ratio
– Has thermal protection feature
– Pulling low current supply of 0.5A
 Delivering 68W to a 4 speaker
 Has 0.1% of THD from 20-20kHz
 Requiring 25V from voltage supply
Design Circuitry
V+
100uF
10k
pot
700nH
1k
LM3
886T
10
250pF
1k
20k
100uF
Mute
1k
10uF
100uF
V-
Current Status
 Achieved 25% more power than rated
 The module is on-track to meet schedule
 Working on the module housing
 Not expecting any delays or unsolved issues