CS-EE 480 Fall 2003

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University of Portland School of Engineering

Project Brown TroutIn-Line Headphone Amplifier

TeamCasey Hughes

Jeff Sharp

Jim Bosak

AdvisorDr. Inan, Dr. Albright

Industry RepresentativeMr. Howard Voorheis, John Fluke Mfg. (ret)

CS-EE 480 Fall 2003

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University of Portland School of Engineering

Overview

• Block Diagram (Refresher)• Schematic• Milestones• Accomplishments• Plans• Issues/Concerns

CS-EE 480 Fall 2003

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University of Portland School of Engineering

Brown Trout

CS-EE 480 Fall 2003

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University of Portland School of Engineering

Brown Trout

CS-EE 480 Fall 2003

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University of Portland School of Engineering

Bode Plots

CS-EE 480 Fall 2003

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University of Portland School of Engineering

Matlab Plots

CS-EE 480 Fall 2003

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University of Portland School of Engineering

MilestonesNumber Description Original

11/25/03Previous1/27/04

Present2/24/04

1 Product Pre-Approval 9/05/03 9/05/03 9/05/03

2 Functional Spec 1.0 10/3/03 10/3/03 10/6/032 Plan Approval 11/7/03

11/23/0311/7/03 11/7/03

3 Hand Design    11/23/0311/25/03

 11/23/034 Software Simulation  11/25/03    11/25/045 Design Release 12/5/03

1/19/0412/5/03 12/5/03

6 Obtain Parts    1/29/04  2/1/047 Test Parts 1/22/04 

1/26/041/30/04    2/3/04

8 Battery Interface    2/5/04  2/10/049 Cable Connector Interface  1/28/04  2/5/04 2/10/04

10 Amplifier Layout Complete  2/06/04  2/25/04 2/25/04 11 TOP’s Approval 2/13/04

2/13/042/13/04 2/19/04

12 Amplifier Tested/Debugged   3/15/04   3/15/0413 Device Housing   2/13/04

2/23/043/7/04   3/15/04

14 Prototype Completion    3/23/04  3/23/04

15 Prototype Tested/Debugged 4/9/043/29/04

4/9/04 4/9/0416 Demo Design   3/29/04 3/29/04 17 Prototype Release 4/09/04   4/09/04  4/09/04

18 Founder’s Day 4/13/04 4/13/04 4/13/0419 Final Report 4/23/04 4/23/04 4/23/0420 Post Mortem 4/30/04 4/30/04 4/30/04

CS-EE 480 Fall 2003

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University of Portland School of Engineering

Accomplishments

• Parts Received / Tested for Functionality

• Theory of Operations Approved

• Initial Amplifier Layout Complete– Passing high quality sound– Problem in final stage (high pass)

CS-EE 480 Fall 2003

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University of Portland School of Engineering

Plans For March

• Fully Functional Amplifier

• Device Housing Completed

• Full Prototype Built– All parts brought together

• Demonstration Designed

CS-EE 480 Fall 2003

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University of Portland School of Engineering

Issues / Concerns

• High-Pass Stage Clipping (next slide)– Half-amplification

• Passing Original Signal– Leave device plugged, but powered off– Researching switch types to compensate

CS-EE 480 Fall 2003

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University of Portland School of Engineering

High-pass Issue

CS-EE 480 Fall 2003

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University of Portland School of Engineering

Conclusion

• Block Diagram• Schematic• Milestones• Accomplishments• Plans• Issues/Concerns

CS-EE 480 Fall 2003

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University of Portland School of Engineering

Questions?