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The Blue Box

The Blue Box. Introduction. Members: Miles Blair Cody Dinges Greg Entzel Derek Glass Abstract:

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The Blue Box

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  1. The Blue Box

  2. Introduction • Members: Miles Blair Cody Dinges Greg Entzel Derek Glass • Abstract: The aim of this project is to design and construct an analog guitar amplifier with integrated guitar effects filters that are configurable via a smartphone user interface. To this end, we hope to provide instrumentalists with desired analog guitar tones and effects accompanied with a modern take ona traditional amplifier and effect pedal knobs. In this way, we are able to bridge the gap between a retro amplifier design and devices commonplace amongst the general public today (smart phones). This design has serious impact on the way guitarists think about analog guitar effects; eliminating the need for a large effects board for desired sounds, and removing the tedious nature of changing settings on equalizers and effects pedals. By making tone modification cleaner and more manageable, players can explore and save new guitar sounds with ease, and ultimately focus more heavily on playing techniques.

  3. Background – Tube Amplifiers • Why tubes? • Tubes provide a range of tones from mellow to gritty • Benefits to versatility in tone control appeal to advanced guitarists

  4. Background – Filtering/Effects • Complicated foot pedal board configurations • Large number of effects needed with unique settings

  5. Background – Filter/Effect Control • Configuring analog effects is limited to pushbuttons and potentiometers • Large configurations have a huge number of settings and thus knobs • Lack of presets with the touch of one button • Digital alternatives exist • Lose tone with digital sampling

  6. Approach – Level 0 Decomposition

  7. Approach – Level 1Decomposition

  8. Implementation – Level 2 Decomposition

  9. Implementation – Analog Board • Effects and filtering implement digitally controlled analog passive components. • Digitally set potentiometers and resistors for various functionality • Amplification consists of pre-amplification and power-amplification • Pre-amp triode tubes provide signal amplitude required for power-amp • Power-amp provides high-gain

  10. Implementation – System Context Diagram

  11. Implementation – Android UI Main UI Preset UI EQ/FX UI • Also utilizes Android • menu and back • buttons:

  12. Implementation - Foot Pedal Interface • Effects buttons assigned by Android settings • Triggered buttons change color and engage analog effects via digitally controlled potentiometers/resistors • 7-Segment displays indicate preset • “Next” and “Previous” preset change buttons below display • Sequence of presets determined either in order or in performance mode

  13. Division of Labor

  14. Schedule

  15. Risks • Power supply – High Voltages • Tube power – Narrow design limits • Tube interference and sensitivity to noise • Pre-amp design limitations • Bluetooth transmission distance/reliability • Database complexity

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