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• Members:Miles BlairCody DingesGreg EntzelDerek 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 on a 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.
Introduction
• Why tubes?• Tubes provide a range of tones from mellow to
gritty• Benefits to versatility in tone control appeal to
advanced guitarists
Background – Tube Amplifiers
• Complicated foot pedal board configurations
• Large number of effects needed with unique settings
Background – Filtering/Effects
• 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
Background – Filter/Effect Control
• 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
Implementation – Analog Board
Implementation – Android UI
Main UI Preset UI EQ/FX UI
• Also utilizes Android menu and back buttons:
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
Task Derek Glass Cody Dinges Greg Entzel Miles Blair
Build and test filters X X
Build power supply X X X
Build amplifier X X X X
Android initialization X X
Design User Interface X X X X
ARM data Interfacing X X
Foot Pedal Interfacing X X
Construction of Amp X X
Division of Labor