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Noise-free distortion pedal for electric guitars: Designing and constructing a unique distortion pedal for live playing guitarists
KTH, School of Electrical Engineering and Computer Science (EECS).
KTH, School of Electrical Engineering and Computer Science (EECS).
2019 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Guitarists using effect pedals to alter the way their guitar sounds often face the problem of loud noise when they want their guitars to be completely silent. This can be the result of using a distortion pedal which works well when you’re playing, but not when you have a brief pause. This project focuses on developing a complete prototype of a distortion pedal that has an adjustable mute circuit, also known as a noise gate, built into it. The project pedal consists of some functions which commercially available effect pedals have; 6.3 mm input jack, on and off switch, both a battery connector and a DC-jack, and adjustable knobs for the different effects like drive, tone and volume. The distortion circuit is inspired by the BOSS SD1 SUPER OVERDRIVE pedal and the muting function is constructed with Junction Field Effect Transistors.Two prototypes were constructed; one with hole mounted components, and one with surface mounted components. They both work largely as imagined. When the guitar is played, the desired distorted sound can be heard and adjusted with a drive, tone and volume control. When the guitar is not played, all unwanted noise is completely muted. A sensitivity adjusting knob allows for different signal strengths to be muted.The chosen method for muting the signal introduces a short and faint unwanted noise during the muting process. While it would have been better to eliminate this noise too, the prototype introduces something new and helpful for guitarists using distortion pedals. With more work, this way of integrating a mute circuit in distortion pedals could potentially set a new standard.

Abstract [sv]

Gitarrister som använder effektpedaler för att ändra hur deras gitarr låter stöter ofta på problemet där oönskat brus uppstår när de vill att gitarren ska vara helt tyst. Detta kan vara resultatet av att använda en distortionspedal som fungerar väl när man spelar på gitarren, men inte när man tar en kort paus. Detta projekt fokuserar på att utveckla en fulländad prototyp av en distortionspedal som har en justerbar mutefunktion, också kallad en brusgrind. Pedalen har några funktioner som vanligtvis finns hos de kommersiellt tillgängliga pedalerna; 6.3 mm ingångsoch utgångskontakter, av-/påknapp, strömförsörjning via både ett batteri och vägguttag, och justerbara kontroller för förvrängning, ton och volym. Distortionskretsen är inspirerad av pedalen BOSS SD1 SUPER OVERDRIVE och mute-funktionen använder sig av Junction Field Effect Transistorer.Två prototyper konstruerades; en med hålmonterade komponenter, och en med ytmonterade komponenter. De både prototyperna fungerar i stort sett enligt de uppsatta målen. När gitarren spelas så hörs det önskade förvrängda ljudet som kan justeras med kontrollerna. När gitarren inte spelas dämpas allt oönskat brus till en ohörbar nivå. En känslighetskontroll tillåter olika signalstyrkor att tystas.Den valda metoden för mute-funktionen introducerar ett kort och svagt oönskat ljud som uppstår under själva dämpningsprocessen. Medan detta oljud är något som bör lösas så ger prototypen fortfarande något unikt och hjälpsamt för gitarrister. Med mer arbete skulle detta kunna förbli en ny standard inom distortionspedaler.

Place, publisher, year, edition, pages
2019. , p. 47
Series
TRITA-EECS-EX ; 2019:591
Keywords [en]
Electric guitar; effect pedal; audio muting; noise removal; noise gate
Keywords [sv]
Elektrisk gitarr; effektpedal; ljuddämpning; brusbortagning; brusgrind
National Category
Computer and Information Sciences
Identifiers
URN: urn:nbn:se:kth:diva-259749OAI: oai:DiVA.org:kth-259749DiVA, id: diva2:1353365
Supervisors
Examiners
Available from: 2019-09-23 Created: 2019-09-23 Last updated: 2019-09-23Bibliographically approved

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