Questions tagged [guitar-pedal]

Electronics circuits design for guitar pedals

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59 views

12-15V to 9V power supply required to power audio equipment

I have a 12-0-12 transformer with output after filtering 15-16V. It's for audio equipment uses. I want to power a guitar pedal with 9V. I tried L7809 but it's making a whistling noise, so I tried ...
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1answer
52 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. ...
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2answers
32 views

Feedback Loop Filters?

In the pictured schematic, is there a band pass filter in place? I’m having trouble understanding the function of R4, R6, C3 & C4. Any help or resources would be appreciated.
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1answer
93 views

Reducing the number of expensive capacitors in an audio opamp circuit

I'm designing a guitar effect (simple booster) which uses a CD4053 cmos switch as outlined here (http://www.geofex.com/Article_Folders/cd4053/cd4053.htm) As you can see from the second diagram, RG ...
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1answer
67 views

Why Does the Input Voltage Drop When a Linear Regulator is Added as Load

Why does adding a linear regulator to this circuit cause the input voltage (V_c) to drop? The 9V input coming in is regulated. The voltage measured at the branch between D5 and R22 is ~8.7 V, so it ...
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0answers
60 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 ...
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1answer
122 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'...
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1answer
186 views

12AX7 Valve Overdrive/Distortion Effect Pedal

I'm following the schematic below using the recommendations plus a couple of extra LEDs. With the footswitch in the enabled position, I'm not getting any sound. In the bypass position, the input and ...
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2answers
390 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
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1answer
142 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 ...
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2answers
816 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 ...
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1answer
187 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 ...
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1answer
32 views

Advice on power section circuit

I'm designing a power section for my guitar pedal circuit that will supply power to my pedal using either a 9V power supply or a 9V battery. I'm using a switched barrel jack but I'm not sure if I have ...
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0answers
58 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 (...
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1answer
125 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 ...
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2answers
53 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 ...
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2answers
91 views

Increasing diode clipping influence

I'm working on a guitar pedal distortion circuit and I've been experimenting with introducing diode clipping into the signal. My question is, how can I increase the influence this diode clipping has ...
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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 ...
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1answer
71 views

Powering up second LM386N results in screaming squeal

So I'm definitely a newcomer in the audio electronics realm but I've been really digging into circuits and experimenting with sounds. I've been focusing alot of time working through examples that use ...
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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 ...
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1answer
126 views

How to measure the output impedance of a valve preamp?

I was trying to measure the output impedance of a DIY preamp for the past couple of days without any luck. Each time, I got to the same result of around 3K3 ohm, which is unbelievably low. This is ...
4
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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 ...
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1answer
82 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 ...
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0answers
225 views

How to make a guitar amp switcher?

So I'm trying to build a guitar amp switcher (and I don't really know what I'm doing =)). The idea is that guitar out is connected to X4 jack and then switched to either X1, X2 or X3 jack, which ...
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1answer
55 views

Basic circuit to turn on LED when input detects signal (for guitar)

I'm looking for a basic circuit snipping which can either turn on an LED or give a positive voltage when input signal from a guitar is detected. Basically, I have an existing circuit where an effect (...
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3answers
454 views

How to get +6V and -6V out of 12V PSU [duplicate]

I am designing a guitar pedal using OpAmps, and i need to feed them with +6V and -6V (beucase the musical signal is senoidal centered in 0V). I need to use a 12V DC PSU for the pedal, and i need to ...
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2answers
264 views

Ticking noise from guitar pedal attempt

I am working on a tremolo guitar pedal circuit. A tremolo pedal basically attenuates the guitar signal using a pattern. Most tremolos use a combination of LEDs and LDRs to do this, but since I do not ...
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1answer
182 views

Does anyone know how the Boss Metalzone sweepable mids affect the bandpass?

https://electricdruid.net/boss-mt-2-metal-zone-pedal-analysis/ https://sound-au.com/project150.htm Like in the original question - I'm struggling to understand the relationship between the op-amp on ...
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2answers
106 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 ...
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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. ...
3
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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 ...
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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 ...
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1answer
462 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 ...
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1answer
243 views

MOSFET analog switch, Transmission Gate, Bilateral switch circuit questions

Below is an LTSpice simulation of two attempts at a Mosfet bilateral switch or 'transmission gate'. The plot shows the switch (onoff) going from 0 to 5v (in blue) and a sine wave audio signal being ...
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1answer
186 views

EHX LPB1 circuit not working

I am very new to making circuits and have tried to make an EHX LPB1 circuit: When powered and plugged in, the 9v battery overheats and all I can hear in my amplifier is static noises and no output. ...
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1answer
232 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 ...
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1answer
84 views

Can I use a capacitor which has 275v +-10% tolerance in a 9V circuit?

I am trying to get parts for a circuit i want to make and I'm very new at making circuits. As a result i'm unsure if i can use a 150nF capacitor with 275v+-10% tolerance in the following circuit or ...
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2answers
165 views

What does this RC network do in this audio transformer output stage?

This is a relatively well known ABY circuit available on the internet. CLICK HERE, REMOVED IMAGE FOR COPYRIGHT REASONS I have two questions about this circuit : 1) What does the RC network (in the ...
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1answer
708 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 ...
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1answer
167 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 ...
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2answers
216 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 ...
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1answer
126 views

Guitar Dual Volume Control Not Working Correctly

I'm not sure if this is the correct place to ask this, please notify me if there is a better place. I have just created my first guitar pedal and thought i would go simple with a basic passive ...
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1answer
3k views

Can I plug a 12v DC in to a 9v Pedal? [closed]

pretty much as the title goes.. is it okay to plug an 12v DC power supply to 9v pedal? Power Supply >> Voodoo Lab ISO-5's Manual for reference Pedal >> ADA GCS-5's Manual for reference p.s deeply ...
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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 ...
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1answer
768 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 ...
3
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3answers
746 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. ...
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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 ...
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4answers
496 views

How does the power switch of an active noise canceling headphone work? [closed]

I have a noise cancelling headphone that still works as a passive headphone when turned off, even with the battery removed. How does this work? In my mind noise cancelling is basically adding ...
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3answers
158 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 (...
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1answer
92 views

Sound amplification

A few months ago I built myself a cigarbox guitar. I built all myself, including the pickup and I have wired it with a volume potentiometer and a jack output. It works well but I have to use a pedal ...