Questions tagged [guitar-pedal]

Electronics circuits design for guitar pedals

Filter by
Sorted by
Tagged with
1
vote
1answer
119 views

Why does this opamp have a diode on v+

I was working on a layout for a guitar effect, and noticed on the schematic that 1 opamp has a 1N4148 diode on V+. IC6 on the schematic below. Given it has an internal power supply, I'm assuming ...
1
vote
0answers
46 views

Can arcing in IEC 60320 C13/C14 connectors damage a device?

I have a 'guitar effects power supply' built to supply 9v/12v/18v power to 🎸 guitar effects pedals. It is powered using a IEC 60320 C13/C14 power receptacle and cable. After using this device for the ...
0
votes
1answer
71 views

Can I use a bench power supply as a substitute for a 9V DC adapter?

I want to test a guitar pedal but I don’t have a 9V adapter around - but I do have access to a DC power supply. Is it possible* to alligator clip the +ve to the power terminal and ground to the ...
0
votes
1answer
17 views

Switched Mono jack + battery: Make circuit when plugged in

I would like to replicate the functionality inside the Ampoids guitar amp (9v battery) in which the circuit is turned on only when you plugin a male 6.3mm mono jack to it I believe that the most ...
0
votes
0answers
71 views

Using an NPN transistor as a signal switch

I'm using this NPN switch to turn on and off a clean guitar signal (as part of a much bigger circuit not seen.) The base is connected to the switch, which gives the base 9V through a 1 megaohm ...
0
votes
0answers
28 views

Potentiometer bypassing for guitar pedal UI

Firstly, I'm an electronics/hardware noob. I'm working on a project using a Raspberry PI pico to collect UI inputs for a digital guitar pedal. I'd like to use the 3 ADC pins to measure 3 ...
1
vote
2answers
93 views

Purpose of 100 ohm resistor on guitar pedal output buffer

On the schematic for an Ibanez "Tube Screamer" there is a 100 ohm resistor in series with the output emitter follower: The output impedance of this pedal is 1.2K: It looks like RB has a ...
1
vote
1answer
64 views

Band-pass op-amp structure with parallel diodes in feedback?

It's been a while since I've done analog circuit theory, and I'm trying to interpret the 2nd gain stage sub-circuit in this schematic for a guitar pedal: I'm not sure if I'm approaching the circuit ...
0
votes
1answer
81 views

Loud hum emitting from output stage of Raspberry Pi guitar pedal

I've been trying to implement the electrosmash Pedal Pi project using a Raspberry Pi 4 Model B, breadboards, and parts purchased from DigiKey. For reference, here is the overall schematic of the build:...
0
votes
0answers
54 views

DIY Distortion Pedal Part 2

i'm having trouble with my distortion pedal. I believe I've fixed the input problem with the last design, but it still has the same problem. Currently, any distortion comes from the second op-amp, ...
1
vote
1answer
68 views

DIY distortion pedal help

I'm trying to design a guitar distortion pedal, though it is not working as expected. The built circuit behaves differently than the simulated LTspice model. I currently do not have access to a scope, ...
0
votes
0answers
48 views

Can I replace a music toy speaker with a 6.3mm jack?

This toy keytar gas an 8 ohm speaker and adjustable output volume. If I simply replaced the speaker with a 6.3mm jack to use it with guitar pedals and speakers that can handle the line level, would I ...
1
vote
2answers
91 views

I am building my own distortion pedal but every time I connect it to a 9V power source it does not seem to work?

I am trying to build my own distortion pedal. I initially built this on a breadboard and connected it to a 9V power supply and it seemed to work fine when I connected it to my electric guitar. So I ...
0
votes
3answers
226 views

Can I use 18AWG wire instead of 22AWG when doing guitar pedal modifications?

I'm planning on doing some modifications to my Dunlop GCB95 Cry Baby wah pedal. As far as I can tell, the hookup wire in the pedal is 22AWG (it's difficult to read what's printed on the side). The ...
0
votes
1answer
182 views

DIY guitar pedal schematics

I'm trying to build these 2 pedals: http://byocelectronics.com/lilgrayodschematic.pdf http://byocelectronics.com/lilcompschematic.pdf both circuits have these parts separated from the "main&...
1
vote
3answers
139 views

Need help for troubelshooting a modification to a reverb circuit on a guitar amp to an FX loop circuit

Sorry if I am redundant here. I am totally new to this type of site so I apologize in advance. I found a similar question on the site but I didn't know if it was still active and I think my question ...
0
votes
1answer
78 views

Switching polarised capacitors in a guitar effects pedal

I'm building a basic guitar distortion pedal, the Two-Transistor Fuzztone from the book Snip, Burn, Solder, Shred. I want to add a multi-throw rotary switch to select between input capacitors, and so ...
0
votes
1answer
29 views

Can I use a buffer on my bias voltage net?

I'm a french stompbox / bass guitar pedal hobbyist, probably very bad at designing them. I've been thinking about bias voltage nets for some time, and how inefficient they sometimes are. I've studied ...
1
vote
1answer
154 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
2answers
126 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.
0
votes
0answers
88 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 ...
1
vote
1answer
181 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. ...
0
votes
2answers
149 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.
0
votes
1answer
121 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 ...
1
vote
1answer
177 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 ...
1
vote
1answer
436 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'...
0
votes
1answer
815 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 ...
2
votes
2answers
468 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
259 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 ...
1
vote
2answers
2k 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
1answer
385 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 ...
0
votes
1answer
36 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 ...
1
vote
0answers
90 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 (...
1
vote
1answer
183 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
59 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 ...
0
votes
2answers
162 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 ...
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 ...
0
votes
1answer
113 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 ...
3
votes
4answers
3k 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 ...
0
votes
1answer
237 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
votes
2answers
3k 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 ...
2
votes
1answer
118 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
0answers
453 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 ...
0
votes
1answer
68 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 (...
0
votes
3answers
774 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 ...
0
votes
2answers
385 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 ...
0
votes
1answer
240 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 ...
3
votes
2answers
161 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 ...
1
vote
1answer
56 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. ...
4
votes
1answer
3k 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 ...