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In-Line Headphone Amplifier

In-Line Headphone Amplifier. Advisor Dr. Inan, Dr. Albright Industry Representative Mr. Howard Voorheis Fluke Manufacturing (Ret.). Authors Jim Bosak Casey Hughes Jeff Sharp. Agenda. Introduction Jeff Sharp Background Jeff Sharp Methods Casey Hughes Results Casey Hughes

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In-Line Headphone Amplifier

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  1. In-Line Headphone Amplifier • Advisor • Dr. Inan, Dr. Albright • Industry Representative • Mr. Howard Voorheis • Fluke Manufacturing (Ret.) Authors Jim Bosak Casey Hughes Jeff Sharp University of Portland School of Engineering

  2. Agenda • Introduction Jeff Sharp • Background Jeff Sharp • Methods Casey Hughes • Results Casey Hughes • Conclusions Jim Bosak • Demonstration Jim Bosak University of Portland School of Engineering

  3. Introduction • Team Members: Jeff Sharp, Casey Hughes, and Jim Bosak • Thanks to Dr. Aziz Inan, Mr. Howard Voorheis, Dr. Robert Albright, and Dr. Peter Osterberg • Our project amplifies output signals from personal listening devices • As a result, the sound is louder and more clear at high volumes • You will learn how we did it University of Portland School of Engineering

  4. Background • Some personal listening devices lack the power • Amplification of sound • Powered by (2) 9V Batteries • Selectable Gains 2X, 3X, and 4X University of Portland School of Engineering

  5. Methods • Determine what we need • Bandpass filter (20 Hz – 20 kHz) • Audible sound • Switchable Gain (2,3,4 X amplification) • Plan of action • Bandpass Filter = Buffer + LPF + HPF + Current Boost • Gain Control = Switchable feedback resistors on HPF University of Portland School of Engineering

  6. Define LPF University of Portland School of Engineering

  7. Define HPF University of Portland School of Engineering

  8. Define Current Booster IN OUT University of Portland School of Engineering

  9. Methods Cont… • Previous equations  component values • Transfer function  Bode Plots • Gain and phase margin analysis • Confirmed functionality of design University of Portland School of Engineering

  10. Results (Block Diagram) Look here University of Portland School of Engineering

  11. Results (Schematic) HPF LPF Buffer Stage Current Boost Headphones CD Player University of Portland School of Engineering

  12. Results (Bode Plot) University of Portland School of Engineering

  13. Conclusions • Headphone Amplifier • Cheap • Versatile • Long battery life • Signal is clear • Anyone can use it University of Portland School of Engineering

  14. Conclusion Continued • To change in the future • CMOS Chip • Level of the gains University of Portland School of Engineering

  15. Demonstration University of Portland School of Engineering

  16. Demonstration (2X) University of Portland School of Engineering

  17. Demonstration (3X) University of Portland School of Engineering

  18. Demonstration (4X) University of Portland School of Engineering

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