Digital analog guitar effects processor
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Digital/Analog Guitar Effects Processor. Team 17 Mike Burns, Mark Rovedo, Eric Harter. Overview of Project. Digital echo, modulation, and distortion effects Two types of analog distortion effects (Fuzz, Overdrive) Analog buffers and gain stages. Goals of Project.

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Digital analog guitar effects processor

Digital/Analog Guitar Effects Processor

Team 17

Mike Burns, Mark Rovedo,

Eric Harter


Overview of project
Overview of Project

  • Digital echo, modulation, and distortion effects

  • Two types of analog distortion effects (Fuzz, Overdrive)

  • Analog buffers and gain stages.


Goals of project
Goals of Project

  • Easy user customization of digital effects

  • Warm distortion tones through analog circuitry

  • Buffered input and output to avoid high frequency attenuation of guitar signal


Advantages of mixed circuitry

Digital

Provides versatility

Ease of implementation for some effects

Analog

“Warmer” sound

Cheaper to implement for single effects

Advantages of Mixed Circuitry



Analog section
Analog Section

  • Fuzz Circuitry

  • Overdrive Circuitry

  • JFET Buffer


Fuzz

  • Dual BJT Design

  • Square wave clipping

  • Buffered output



Overdrive circuit
Overdrive Circuit

  • Emulates overdriven vacuum tube through asymmetrical diode clipping

  • Dual op-amp design

  • Op-amp output provides adequate buffering at the output



Jfet buffer
JFET Buffer

  • Simple unity-gain JFET amplifier

  • Flat frequency response across wide frequency band

  • Provides “gentle” clipping if overdriven



Comparator
Comparator

  • Four-LED indicator to signal when input of DSP may be clipping

  • Circuitry consists of 4 op-amps running open loop



Digital section
Digital Section

  • Flange

  • Tremolo

  • EQ

  • Reverb

  • Distortion


Motorola 56302 dsp
Motorola 56302 DSP

  • Provides 24-bit processing

  • Serial interface

  • Ideal for audio applications


Flange
Flange

  • Frequency Modulation

  • Rate

  • Depth



Tremolo
Tremolo

  • Amplitude Modulation

  • Depth

  • Rate



EQ

  • Low and High band

  • FIR filters



Reverb
Reverb

  • Feedback from previous samples

  • Delay control



Distortion
Distortion

  • Hard Clipping

  • Pre-Gain

  • Post-Gain



GUI

  • Matlab Interface

  • Sliders for each function

  • On/Off Switch per function

  • Outputs to Serial Port


Cost analysis
Cost Analysis

  • Parts………………………………………..……….$348.00

  • Labor (at $40.00 / hr, 10 hr/wk, 15 wk)

    • Development and Design…………….$15,000.00

    • Manufacture………………………………..$3,000.00

    • Test and Verification……………………$22,000.00

  • Total…………………………………….$40,348.00


Problems
Problems

  • Mixer and series/parallel switch ineffective

  • Poor tone out of Fuzz circuitry

  • JFET buffer and input gain stage somewhat redundant


Changes made
Changes made

  • Removal of output gain stage

  • Removal of series parallel switch

  • Addition of distortion bypass switch


New block diagram
New Block Diagram

GUI

Impedance bypass

switch

Distortion bypass

switch

JFET Buffer

Gain Stage

DSP

Distortion

Effects

Input

Output

Comparator


Future enhancements
Future Enhancements

  • Redesign and retest Fuzz circuitry

  • Add more analog effects

  • Fine-tune DSP’s user interface

  • Headphone amplifier


Conclusion
Conclusion

  • Tone of Overdrive and DSP exceeded our expectations

  • Developed into a useful, versatile tool

  • DSP distortion not nearly as “pleasing” as analog distortion


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