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Questions tagged [guitar-pedal]

Electronics circuits design for guitar pedals

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Is the reason for guitar "tone suck", i.e. loss of high end frequencies with impedance mismatching, actually due to high reactance?

When connecting a guitar's output to an input with insufficiently high input impedance, the signal is undesirably filtered, which is referred to as "tone suck". To deal with this, it is ...
interoception's user avatar
0 votes
2 answers
145 views

Struggle with gated sound - Fuzz stompbox

I built my first fuzz pedal based on the Tone Reaper but I can't handle with gated sound. Whatever the fuzz pot is set the sound is gated. At low position the signal is very weak and chopped, even ...
Gwen Grand's user avatar
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1 answer
78 views

Gate switching - Guitar signal gate controlled by another signal

The circuit below is based on a noise gate and a JFET based switching circuits. The idea is to mute the guitar signal when another signal pases certain threshold of volume (like a reversed gate ...
Electrical Voyager's user avatar
3 votes
1 answer
481 views

Why am I not getting an output from this breadboarded phaser?

After following along with a hobbyist's video, I breadboarded a phaser. Unfortunately it seems my circuit is not achieving anything close to what the hobbyist achieved with his. I believe the issue is ...
Thxforhelping's user avatar
0 votes
1 answer
57 views

Switch to handle two inputs and switch between two sets of two outputs (guitar amp send and return switch)

I am looking to build a simple box, for fun, to switch the send and return signals from a guitar amplifier effects loop between two different amplifiers, depending on which amp I am using at the time. ...
jlbriggs's user avatar
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0 answers
33 views

Impedance matching: headphones out / hijacked op-amp pin -> guitar input

I have a Vox "amplug" pocket amp which has a female 1/4" mono input, it's supposed to be dangling directly from the guitar's output jack, and has 3.5mm TRS headphones out. I'd like to ...
delt's user avatar
  • 101
0 votes
1 answer
281 views

NE5532 as a Guitar Pedal Buffer

I’ve been trying to better understand the NE5532 and wanted to try designing some circuits with it. I wanted to do a dual-supply non-inverting guitar pedal buffer, but I’m concerned about the input ...
Eli Y's user avatar
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1 answer
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Why isn’t my overdrive circuit working?

I have attached an image of an overdrive circuit that I have designed for a guitar pedal. I have built the circuit and it isn’t working and I wanted to find out if there were any obvious design flaws/...
Dan Best's user avatar
1 vote
1 answer
248 views

Difference between tone control circuits in a simple op amp overdrive pedal

I am trying to understand the differences in operation and frequency response of the following tone control circuits. This question only applies to the sections circled in red. The rest of the ...
Dragonfruit1966's user avatar
0 votes
1 answer
558 views

Increase Input Impedance for Guitar Pedal

I'm designing a guitar pedal circuit. I've received feedback that my input impedance is way too low in regards to my output impedance and I was wondering how I could go about increasing it. To keep ...
Da Mahdi03's user avatar
1 vote
1 answer
86 views

Guitar Pedal Signal Delay and Background Noise

I am designing a guitar pedal for overdrive/distortion from scratch and the circuit creates a lot of noise. The circuit also doesn't immediately start working, there is a delay before the signal makes ...
Da Mahdi03's user avatar
0 votes
4 answers
174 views

Make guitar pedal power supply go from 120mA to 300mA

I have a power supply that takes 220V DC and provides five galvanic isolated 9V DC, 120mA sockets to power electric guitar pedals. Now I have a guitar pedal that consumes 300mA. I want to mod the ...
baumschubser's user avatar
1 vote
1 answer
138 views

Is there a momentary switch that cuts the signal only the very instant it is pressed?

I am trying to build a guitar kill switch that would behave like a typical momentary switch, but with a twist: I would like the audio signal to be interrupted only the very moment I press the button (...
SkyLagger's user avatar
2 votes
0 answers
76 views

Circuit simulation of a tremolo pedal not working

im a electrical engineering student here in Brazil and i have to build a tremolo effect for a electric guitar, but i'm not having luck in the simulation of my circuit and i dont know if im simulating ...
Jonatan Iaczinski's user avatar
1 vote
2 answers
133 views

Guitar pickup and headphones common ground

Trying to get rid of cables on stage. Is it possible to have a shared common ground for my guitar pickup and monitoring headphones (with a clip on headphone amp) without getting a signal loop? ...
maxo's user avatar
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1 vote
3 answers
235 views

Bias voltage in non-inverting op-amp topology being pulled down

I decided to quickly put together a circuit today but found an issue that has sometimes happened when making circuits with TL072. Briefly, the circuit is a non-inverting amp with about 34dB gain in ...
CouchAnalysis's user avatar
4 votes
1 answer
99 views

I am rewiring my old guitar and I need help with the potentiometers

Is it possible to convert a 250 kΩ potentiometer to 500 kΩ or a 500 kΩ stereo potentiometer to mono? I am finding it difficult to locate a 500 kΩ mono potentiometer.
Ocean Man's user avatar
0 votes
1 answer
268 views

Why are there resistors after the potentiometers in a passive audio matrix mixer?

I'm going to build a passive matrix mixer using the information on this site and this schematic: This is the first time I have built any circuits, so I've been doing some research trying to work out ...
Rob's user avatar
  • 1
1 vote
1 answer
191 views

Instrument level to line level and mixing

I would like to convert an instrument level (guitar) to a line level in order to feed the isd1820 sampler chip. What are my option in order of doing so? In addition - I would like to mix the four ...
lon_ly's user avatar
  • 57
1 vote
1 answer
77 views

Electric guitar output not working

So I (foolishly) decided to try and build an effects pedal of sorts for an electric guitar. I'm running it through an Arduino, and the signal is received by the Arduino just fine, although I had to ...
Sam A's user avatar
  • 11
1 vote
2 answers
182 views

Guitar distortion pedal gain

I am working on a custom distortion pedal. Here is the circuit: As we can see, we have the following flow: Input buffer -> gain stage with hard clipping -> buffer -> tone control using ...
Marko Jurisic's user avatar
2 votes
2 answers
128 views

Common-collector gain for guitar pedal

I am currently working on a distortion pedal. I have just made the initial input buffer to prevent loading the source signal. It is simply an NPN transistor in an emitter follower (common collector) ...
Marko Jurisic's user avatar
1 vote
1 answer
251 views

Changing out a capacitor with a different tolerance

I am trying to replace a capacitor in an already existing circuit. The original capacitor was 473k 100V capacitor, so it had a ±5 tolerance, but I am only able to find 473k 100V capacitors that have a ...
Armando Osegueda's user avatar
0 votes
4 answers
186 views

Op-amp boost pedal tonal noise

I am working on a boost pedal, but I can't seem to find the cause of a humming noise in the circuit. I tried bigger caps for C5 and C6, but it didn't solve the issue. For power I use an 18V model ...
Johny5's user avatar
  • 19
2 votes
2 answers
146 views

E-Guitar / Bass amplifier Effects-Loop: Is there a standard for voltage levels & impedances? [duplicate]

Musical instrument amplifiers often have an "FX-loop" with a pair of jacks which can be used to interrupt the default connection between preamp & power amp, to put the preamplified ...
user1847129's user avatar
0 votes
0 answers
171 views

Buffered audio splitter too hot for volume chip

I'm building MIDI controlled effects pedal that autofades the blend amount of a send-return effect loop. Still pretty much a noob on the analog side, so bear with me. Firstly I need to split the ...
Jesper Kragh's user avatar
0 votes
3 answers
118 views

Distortion pedal volume and tone control messing up circuit

I have built a distortion pedal with 3 variable controls: gain, tone and volume. R8 is my gain control (it will be a potentiometer with 50k to 500k resistance.) R5 is the tone control, (low pass ...
Marko Jurisic's user avatar
1 vote
1 answer
490 views

Distortion Pedal Design

I am building a guitar pedal and came across a reference design here: https://www.wamplerpedals.com/blog/uncategorized/2020/05/how-to-design-a-basic-overdrive-pedal-circuit/ I'm not sure why the ...
Marko Jurisic's user avatar
0 votes
1 answer
149 views

How to enrich harmonics in audio?

I'm designing a guitar pedal to boost harmonics in the signal here: Falstad Link I'm wondering if there are ways to boost harmonics that don't clip the signal, as well as any adjustments I should make ...
Daniel Oren-Ibarra's user avatar
2 votes
0 answers
215 views

Use TRS jack as Mono + 5V power input

I'm trying to change this guitar wireless transmitter so that the audio input jack also becomes a charging/power source. The charger will be a separate box with "stereo" input socket. ...
nuclear X's user avatar
1 vote
1 answer
156 views

What's going on in these op amp feedback paths?

Here is the schematic to my new Behringer UM300 guitar distortion pedal. Most of the circuitry is pretty straightforward (a lot for the $22 I paid!) but can someone explain what the emitter follower ...
Rob Lewis's user avatar
  • 299
5 votes
3 answers
2k views

Overdrive guitar pedal sounds better without a clipping diode

I built a guitar pedal which looks like this (the schematic is a clone of a Tube Screamer) and I have a question regarding something unusual I discovered. There are two diodes, D1 and D2, which ...
Max Walczak's user avatar
0 votes
3 answers
503 views

Behavior of a common emitter BJT with diode from collector to base

This is the schematic for a popular fuzz pedal. I'm struggling to comprehend the mechanism. For the DC signal V1, the forward drop of the diode VF and VBE are both overcome, but when the positive part ...
PotatoBoy's user avatar
0 votes
0 answers
133 views

I'm tryin' to build my own fuzz but when I plug it in my amp it just makes too much noise

If you need the schematic, just tell me and I'll draw it for you as soon as I'm home again. Anyway, it consists of 3 transistor stages with the first one having the boost control by regulating emitter ...
Operatore_Nabla's user avatar
2 votes
2 answers
804 views

Pedal circuit not working on 9 V battery or 9 V AC adapter

I built a simple NPN fuzz pedal (negative ground) and soldered it up on some perf board. It works just as expected using my power supply but when hooking up to a 9 V battery or a 9 V DC adapter the ...
Scott's user avatar
  • 21
17 votes
3 answers
4k views

Why NPN and PNP in parallel in this distortion pedal circuit?

I've come across a guitar pedal circuit called a "Tube Sound Overdrive". The schematic is shown below. It looks like a typical common emitter transistor circuit with an adjustable bias (RV1),...
Dave H.'s user avatar
  • 510
-1 votes
3 answers
274 views

Analog Delay Guitar Pedal?

I just finished designing an analog 10-band EQ guitar pedal, and it works really well in simulation. I'll be breadboarding it shortly but another idea popped into my head and I can't stop thinking ...
Michael Beckwith's user avatar
8 votes
2 answers
983 views

Please help me debug my circuit

I am trying to build a guitar pedal but am unfortunately failing. I have about a high school physics understanding of electronic circuits, but the readings I am getting seem impossible to me. I might ...
Linus's user avatar
  • 183
0 votes
1 answer
932 views

What is a proper circuit for a variable low pass filter that can be controlled with a potentiometer?

I have some 100k digipots (MCP41100) and I want to make a lowpass filter controlled with an ATmega328P. I want a variable cutoff between 20 Hz - 20 kHz with unity gain. 1st order is enough, but it can ...
Jomonger's user avatar
  • 101
1 vote
1 answer
651 views

Absolute value single supply op amp circuit on TL072 or MC4558

I would like to obtain an absolute value of input signal with TL072 or MC4558 op amps (or other amp) with single supply. When I connect the circuit upper one follows the signal and adds noise and ...
Jomonger's user avatar
  • 101
0 votes
1 answer
74 views

What makes two power supplies equivalent? [duplicate]

Let's say I want to power a Digitech Obscura altered delay pedal. The recommended power supply is a PS0913DC-01. Now let's say it is impossible to get this specific power supply but we do know the ...
thanat0sis's user avatar
2 votes
0 answers
851 views

Active low pass filter built around an LM386

I have some theoretical electronics knowledge from uni, but when it comes to applying it in practice, things can get a little bit complicated. I've built simple stomp box, basically a piezo transducer ...
Jakub Mazur's user avatar
2 votes
2 answers
742 views

Diode in feedback path of transistor (collector-base)?

This is the schematic for a fuzz circuit. Even knowing that the diode is probably what's providing the signal clipping, I still can't figure out how I'm supposed to analyze the circuit. When V(...
Nick Nagy's user avatar
1 vote
1 answer
157 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 ...
Andrew Hopkins's user avatar
2 votes
0 answers
222 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 ...
Xunie's user avatar
  • 185
0 votes
1 answer
309 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 ...
kevidigi's user avatar
1 vote
1 answer
675 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 ...
Javier Mejias's user avatar
2 votes
2 answers
596 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 ...
andowt's user avatar
  • 1,008
1 vote
1 answer
415 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 ...
Nick Nagy's user avatar
0 votes
1 answer
188 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:...
Keith Choa's user avatar