Questions tagged [guitar-pedal]
Electronics circuits design for guitar pedals
111
questions
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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 ...
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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 ...
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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
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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
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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
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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
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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
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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 ...
