Questions tagged [guitar-pedal]

Electronics circuits design for guitar pedals

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7
votes
1answer
563 views

Stompbox not working

Today I've soldered my clone of ZVEX Wooly Mammoth and when I started testing, it didn't give a sound. Hours of visual and multimeter inspections gave me no clue about a mistake. So, I appreciate any ...
7
votes
2answers
2k views

What does this circuit symbol mean? [duplicate]

I'm a student who is trying to build a wah pedal for a guitar. I came across this diagram for how to wire the circuit (from this site) : Within the diagram, I am not sure what the following symbol ...
5
votes
1answer
4k views

Eliminating the humming noise from a cheap SMPS

I am trying to build a power supply unit that powers eight 9V guitar pedals (usually pedals consume 10-100mA). So, I thought I'd buy 8 cheap 9V-1A SMPS adapters and probably fix some bypass capacitors ...
4
votes
2answers
2k views

Single supply non-inverting amplifier using op amp

I'm working on building a distortion guitar effect pedal for an analog electronics class I'm taking. I am struggling with building an amplifying circuit using an op amp (we just began learning about ...
4
votes
1answer
2k views

Reasons for choosing a transistor instead of an op-amp as a buffer

I have often seen circuits for guitar pedals that use an emitter-follower configuration as the input and output buffer (see example below). If an op-amp can provide a greater input impedance / lower ...
3
votes
4answers
2k views

Simple fuzz pedal using breadboard

Complete newbie here. I've been trying to reproduce a simple fuzz pedal using breadboard. Here is the scheme: And here is the current state of my breadboard: The only sound I hear is white noise ...
3
votes
3answers
771 views

Capacitor into resistor to ground

I recently started learning electronics on my own due to interest in audio effects because I play guitar so: I thought I'd start out with distortion pedals, they seemed the simplest to begin with. ...
3
votes
2answers
110 views

Does anyone know how the low tone control of the Boss Metalzone works?

https://electricdruid.net/boss-mt-2-metal-zone-pedal-analysis/ https://sound-au.com/articles/gyrator-filters.htm#s9 I have been using these websites to try and work out how the eq works, but I've ...
3
votes
1answer
1k views

Original cry baby wah wah analysis

I have been given to understand the original crybaby wah schematics. But I can barely understand anything regarding the circuit itself! Any kind of suggestion and help from anyone would be very ...
2
votes
2answers
2k views

Why does this circuit use a transistor buffer even though there is an high input impedance op amp afterwards?

Regarding this circuit I found on www.geofex.com detailing the famous Tube Screamer guitar pedal (source: geofex.com) I don't understand the purpose of the BJT input emitter follower transistor. ...
2
votes
3answers
1k views

My (single ended, class A) tube amp sounds great while it's shutting off. What's happening?

So, I have guitar direct in to a single-ended class A (12AX7 and 6V6) Champ-style amp. The amp is from the 60s and unbranded, it's likely a Pepco (Pine Electronics) Silvertone style circuit. It's been ...
2
votes
1answer
478 views

Opamp Design for Low Impedance Sources?

I am terribly confused ... I tried myself at building a low impedance guitar pickup some time ago. Quick LowZ Pickup Intro Basically just two loops of aluminium with two magnets, a humbucking guitar ...
2
votes
1answer
172 views

Why does a Pull down resistor not affect AC

I've been reading up and trying to learn about Guitar Pedal circuits. I have a very basic question about how a Pull Down resistor is used at the beginning and end of a circuit to avoid a popping ...
2
votes
2answers
277 views

viability of idea for low voltage signal clipping (distortion) for guitar effect

I want to create an guitar distortion effect. What I want is a unity gain buffer op-amp that clips the signal. In the drawing below there is a circuit found on this forum here which will clip a very ...
2
votes
3answers
2k views

Is there any real world difference in upgrading TL071 to OPA314?

I have a DIY made guitar amp in which there is a TL071 preamp section. I read various opinions about how upgrading op amp improves that sound and how it doesn't do anything really... I'm quite ...
2
votes
2answers
397 views

Gibson-style dual humbucker wiring with blend pot and integrated discrete MOSFET buffer using AAA batteries

I have been tinkering with creating a MOSFET buffer circuit for my guitar to boost the high impedance output from the pickups to help drive the signal through long cables and pedal boards. This also ...
2
votes
1answer
240 views

Audio Transformer output straight into an opamp?

Below is a circuit I'm working on. It's a guitar input buffer featuring transformer isolation. The transformer I'm using is pretty expensive and should be fairly linear, but I decided to add a graphic ...
2
votes
2answers
220 views

Digital Audio Effects Design [closed]

I've recently graduated university with an MEng degree in Electrical and Electronic Engineering. As a third year project, I've used an ST-Microelectronics ARM Cortex-M4 based Nucleo microcontroller ...
2
votes
1answer
708 views

Help Needed with Voltage Controlled Synth Circuit

I am building a somewhat out-of-the-ordinary guitar pedal that involves some synth elements, namely controlled voltage. I'm a little confused by something that I suspect is actually pretty basic. I ...
2
votes
1answer
147 views

Analog Switch times for popless audio

If I am using a CMOS switch, how much do I have to slow down the switch time so that I don't experience a pop in my audio signal out of my amplifier and how would I accomplish that? The switch time ...
2
votes
1answer
391 views

Routing Audio Ground - needed or not?

I'm trying to build a guitar pedal switcher (efectively a box that provides multiple effect loops that can be independently bypassed from a single microprocessor) and while building a working ...
1
vote
3answers
163 views

How to determine what capacitance is required for eliminating humming noise?

I've got power supply (transformer based) 9V powering modelling guitar effect processor. That noise gets amplified and it hurts. Humming noise is 100Hz rectified mains. Processor takes 300mA 9V (...
1
vote
2answers
910 views

MXR Distortion + guitar pedal schematic - meaning of +4.5V

I found this schematic of the "MXR Distortion +" guitar pedal. I am trying to rebuild it, but I have some doubts about this +4.5V in the bottom left corner. What does it mean? I mean, I have only 1 ...
1
vote
3answers
1k views

Guitar pedal input stage buffer

In the below schematic for the Tube Screamer guitar pedal input buffer, there is a 1k resistor (R1) after the coupling capacitor (C1). What is the purpose of this resistor? It has no effect on the DC ...
1
vote
3answers
5k views

Audio Signal Switching - “DPDT switch vs. 4066”

I've got a signal coming from an electric guitar and I need to switch it. Basically it's a distortion circuit. I need to switch between the distortion and clean (directly connected to the output) My ...
1
vote
1answer
735 views

Guitar signal with opamp boost

Hi just having some issues understanding what's happening with my opamp circuit. Vin is a Sine wave at 1kHz and VG is 4.5V. From what I understand this circuit should boost the signal I provide it ...
1
vote
1answer
1k views

Switching capacitors in a guitar effects pedal

I've built a linear power booster - schematic here: http://pedalparts.co.uk/docs/LPB-V3.pdf I did it on veroboard: You'll note that it gives you the option of having different capacitor values to ...
1
vote
1answer
1k views

What is wrong with my guitar amp?

I found this 1W guitar amp design on the Internet: http://www.diale.org/punch.html And I am trying to build it on the protoboard. I could not find the IC TDA7052, instead I've got the a TDA7052B. ...
1
vote
1answer
52 views

Low Voltage AC as power source for Audio Equipment?

When might an AC (not DC) voltage be used as a power source for an audio device - most every guitar pedal I've ever owned converted line voltage - 120VAC to some lower DC voltage - often 9v or 12v DC. ...
1
vote
1answer
96 views

Where to include Stomp Switch on this Boost Pedal Schematic?

I'm new to electronics and I am having trouble figuring out this schematic. I understand the circuit but I do not see where the foot switch would come into play and or would be connected. Any help ...
1
vote
1answer
129 views

Dynamic Range Compressor Pedal Operation

A Dynamic Range Compressor works by "clamping" an incoming signal. Above a certain input threshold, the gain of the device is reduced to a lower level. This has the effect of making quieter sounds ...
1
vote
1answer
788 views

Headphone amplifier for guitar with stereo MP3 input - mixing

I'm building a practice amplifier for my girlfriend who is learning to play the bass guitar. I'm a reasonably experienced electronics builder so building something to plug a guitar and headphones into ...
1
vote
1answer
280 views

Op-Amp circuit: Check understanding

Please check my understanding of the components in the following guitar pedal audio circuit and elaborate/ fill in missing knowledge where necessary. Left of the op-amp inputs R1 & C1 presents ...
1
vote
2answers
2k views

Guitar signal input to Arduino UNO ADC - alternative part for TL972 op-amp

I'm trying to make a guitar pedal with atmega328 in Arduino but I've had trouble with input stage. I found this circuit from electrosmash.com, but I can't find the TL972. Are there any replacement for ...
1
vote
1answer
845 views

Safely shutting down 19V mini PC when power fails

I am adding an Intel NUC (4"x4" i5 PC, 12-19V, 10A@19V) to my guitar effect pedalboard for all kinds of fun signal processing with Ableton Live and Max/Msp. I'm building a 12V 20A power supply using ...
1
vote
2answers
89 views

TL072 based circuit generates loud noise

This circuit, designed as a bass scream, keeps generating a low noise about the same loudness as the guitar signal on the output.
1
vote
1answer
56 views

Electromagnetically shield guitar pedal

I've built a few guitar pedals using op-amps, transistors, etc. (with supporting resistors & capacitors of course), and I've generally 3D printed the housing for the components for custom designs. ...
1
vote
1answer
154 views

Trying to make fuzz factory with CV inputs

I'm trying to construct some kind of fuzz factory modular from regular fuzz factory pedal. Circuit of the original pedal is pretty easy, but I've tried to add some VCAs based on LM13700. Honestly, I'...
1
vote
1answer
131 views

Noise in portable power supply to guitar effects pedals [closed]

I am constructing a battery powered power supply for a guitar effects pedal board. There are 5 pedals and I am using a phone charging battery and a boost converter to supply 9V (centre negative) to ...
1
vote
2answers
54 views

Signal leakage when volume is turned all the way down

I was hoping I could get help with a design I have breadboarded/diagrammed with regards to a low level signal still present when I have my volume pot turned all the way down. When I turn my volume ...
1
vote
1answer
87 views

Can I use network cable for low voltage DC power?

I'm a guitar player with a crazy idea for a 2 part bypass looper: Enclosure A is just big enough to house 4 footswitches and an ethernet jack. Enclosure B has 9V DPDT relays to route audio ins and ...
1
vote
1answer
1k views

Soft diode clipping for 'controlling' amplifier levels and avoiding harsh distortion

The title might be misleading/confusing. I'm building an amplifier with TDA2003 IC's which could be both suitable as a guitar amplifier and as a music amp. Where diodes come into this circuit? As ...
1
vote
1answer
232 views

How To Eliminate Amplifier Squeal When PreAmp Power is Turned Off

I have a bass guitar that has a built-in pre amp, which is switched ON whenever the cable is plugged into the bass. I typically use the bass all day, and leave the amp on and the bass plugged in - ...
1
vote
1answer
417 views

Circuit step-by-step check

I've soldered a stompbox for guitar and stuck into having no sound on the output. Visually I checked everything about the soldering and it seems good. As I am not so good at electronics I wish getting ...
1
vote
1answer
211 views

How to control the amplification of a Transistor? [closed]

I'm currently building a very simple overdrive/distortion pedal using a 2N5089 transistor. I want to be able to have a potentiometer control the "drive" which I assume is the voltage amplification. ...
1
vote
1answer
159 views

Pass line level signal through electric guitar

I have an idea for a project where I want to pass a line level signal through my electric guitar. The idea is to have a 3.5mm jack input on my guitar, to which I can input a line level signal. Then ...
1
vote
1answer
65 views

Issues with guitar effect loop switch pedal

I've developed a circuit and custom PCB for use in a guitar pedal effects chain. This takes the input signal and switches it between 3 distinct external loops, (A, B, C) such that you can arbitrarily ...
1
vote
0answers
65 views

“Anti-Pop” Circuit For Guitar Pedals

I want to add resistors to my guitar pedal circuit to remove any popping noise when switching the pedal on and off (actually on and to bypass). Found an article about that, but the values for ...
1
vote
1answer
197 views

Drive transistor harder for more distortion

I've been working on a distortion circuit for a guitar pedal and so far I like the tone but I was wondering if I could get some insight on how I might drive the transistor (T1) harder, increase gain ...
1
vote
0answers
63 views

Emulating guitar pickup loading effects with a floating gyrator?

I'm looking to construct a high impedance buffer which emulates the loading effects of an electric guitar connected to a nonlinear, low input impedance amplifier such as the Dallas Rangemaster (...