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Original effects with schematics, layouts and instructions, freely contributed by members or found in publications. Cannot be used for commercial purposes without the consent of the owners of the copyright.

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Stompboxes circuits published in magazines, books or on DIY electronics websites.
Topics: 810

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Last post Re: Shure - Level Loc Compres…
Jezzzer
24 feb 2025, 16:01
Original Tracer Layouts
A collection of original layouts for vintage guitar effects. If you want to build real replica's of vintage pedals, this is the forum you want to look at.
Topics: 20

20 Topics

111 Posts

Last post Re: MXR Dyna Comp - original …
mozz
09 nov 2023, 19:55

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Projects Index by type of effect

Last post by modman « 21 Jan 2008, 05:37

by modman » 21 Jan 2008, 05:37

Rating: 0.2%

About the projects index

This page tries to keep the available projects indexed.
If you want to share files to build a effect that's not yet (widely) available, it would be a pleasure for us to host it here.
The projects should be verified , though, and at least contain a schematic , some layout file (transfer, vero, perf) and a component layout file .
Incomplete or unverified projects will be moved to the Projects in Progress folder: if you fall upon such a project, please report the...

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View the latest post Projects Index by type of ef …
Last post modman
21 Jan 2008, 05:37

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THE ENGINEER'S THUMB... At last, a better compressor! [documentation]

Last post by jhergonz « 20 May 2018, 18:09
Replies: 101
by merlinb » 21 Apr 2012, 14:23
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Rating: 14.5%

For a long time I've felt guilty that my pedal board didn't include a compressor. Finally, after about a year of breadboarding, I have produced a circuit that can take on a Dynacomp and win , boasting:

Up to five times more headroom than a Dynacomp
Less noise than a Dynacomp
Same available sustain as a Dynacomp
Fewer parts than a Dynacomp
Cheaper than a Dynacomp
Feedforward side chain
Possibility for all five controls
Fits in 1590B
Millennium bypass

Despite its final simplicity, I went though...
101 Replies

261163 Views

View the latest post Re: THE ENGINEER'S THUMB... …
Last post jhergonz
20 May 2018, 18:09
Low voltage tube overdrive

Last post by Vitallka « 15 Mar 2025, 04:50
Replies: 14
by Vitallka » 02 Mar 2022, 10:35

Rating: 3.7%

Hi there. I am from Ukraine and I want to present you my project of low-voltage tube overdrive on a 6И1П (soviet analogue og ECH81).
Scheme:

Sound is recocrding on a blackberry q10 (tube overdrive - tube SE - 1x12 Seventy80):

14 Replies

6907 Views

View the latest post Re: Low voltage tube overdri …
Last post Vitallka
15 Mar 2025, 04:50
THAT Simple Mic Preamp

Last post by soulsonic « 12 Mar 2025, 08:52
Replies: 2
by soulsonic » 09 Mar 2025, 13:16

Rating: 1.3%

Here is a bare bones mic preamp project I designed based on the application notes published by THAT Corp for their THAT 1512 mic preamp chip. This was done at the behest of someone on the GroupDIY forum who was looking for a THAT chip board layout suitable for home etching, but I'm posting it here first for folks to check out and get a first look.

This design includes an option to have a switch for -6dB Line Mode, which takes advantage of a unique feature of the THAT 1512. If the switch is...

2 Replies

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View the latest post Re: THAT Simple Mic Preamp
Last post soulsonic
12 Mar 2025, 08:52
Need help fixing my FuzzFace clone type

Last post by Mikante « 09 Mar 2025, 13:30
Replies: 22
by Mikante » 03 Mar 2025, 12:34
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Rating: 0.9%

Hello,
I have built a fuzzface clone, with some variation of my licking.
The pedal sounds good for what i want but it behaves not as i expected.
I just want to understand.
The circuit is exactly the same, i have just added a pre gain 100k pot, right before the input 2.2uf capacitor and a 10k trim pot on the second transitor collector, this is very common.
Transistors are bc108a for q1 and bc109c for q2, i have two 3pin sockets so i can easily swap them and try different combinations with other...
22 Replies

3046 Views

View the latest post Re: Need help fixing my Fuzz …
Last post Mikante
09 Mar 2025, 13:30
Toaster - from warm overdrive to charred distortion

Last post by earthtonesaudio « 28 Feb 2025, 14:50
Replies: 1
by earthtonesaudio » 15 Feb 2025, 18:35

Rating: 1.5%

I've been on a quest to make a distortion pedal that suits the instruments I have and my playing style and so far I like this one the most. I'd been playing with non-inverting soft clip type of circuits (e.g. Tube Screamer) and didn't hate them, but when I tried stacking a boost in front I got an unexpected result - instead of more saturation I got more clean blended in with the signal. That might work for some people but it's not what I was going for.

So I switched to an inverting...

1 Replies

856 Views

View the latest post Re: Toaster - from warm over …
Last post earthtonesaudio
28 Feb 2025, 14:50
2fet2furious - CMOS octave fuzz

Last post by earthtonesaudio « 28 Feb 2025, 14:48
Replies: 2
by earthtonesaudio » 18 Feb 2025, 01:22

Rating: 1.5%

Nothing fancy here just an antilog amplifier. Inspiration came from here and of course the classic Tube Sound Fuzz from Electronic Projects for Musicians. I think the oct control needs a better name. I want to call it splat because that's what it sounds like to me.

Schematic:
2fet2furious.png

Sound sample. Each phrase repeated 3 times, with oct control at min, then 50%, then full:
cmos_square_octave.mp3

2 Replies

798 Views

View the latest post Re: 2fet2furious - CMOS octa …
Last post earthtonesaudio
28 Feb 2025, 14:48
Single Pole Pickup design.

Last post by Jarno « 26 Feb 2025, 17:57
Replies: 3
by Ferniff » 19 Feb 2025, 23:17

Rating: 0.4%

I'm working on a quad pickup, which involves 4 single pole pickups for each string. Is there a way to improve the design by adding another magnet, side by side? I0,000 winds is almost at the limitation due to the size and material (3D print). I do have a working prototype using one magnet per string, with the added bonus of a buffer with a gain trimpot wired after. But I'm curious if adopting something from a humbucker design would help in anyway.

3 Replies

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View the latest post Re: Single Pole Pickup desig …
Last post Jarno
26 Feb 2025, 17:57
Looking for schematic of: TL072 High Impedance Audio Board Instrument Preamplifier Module For Guitar 12V

Last post by Lani « 23 Feb 2025, 16:09
Replies: 4
by haebbe58 » 22 Feb 2025, 13:34

Rating: 0.6%

Hi Folks,

I am a member since 2017, regarding a lot of the interesting contents here all the time and now I decided to ask the community for the first time. I am 66 years old and living in Germany, playing guitar & bass and built a lot of little tube amps, cabs and some fx units.

So, my question is:

please have a look at this

I am looking for the circuit/schematic, on which this pcb is based on. I am not able to trace the circuit. So maybe there is a member who built and analysed it?...

4 Replies

745 Views

View the latest post Re: Looking for schematic of …
Last post Lani
23 Feb 2025, 16:09
BAJA EVH overdrive pedal project 090218 [documentation]

Last post by Lestad75 « 21 Feb 2025, 22:20
Replies: 22
by bajaman » 09 Feb 2018, 09:00
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Rating: 5.4%

Here it is at long last - the Peavey EVH 5150 preamp section in a nice friendly 9v overdrive pedal format.
You can build it with or without the tone stack and recovery stage or make it switchable - the choice is all yours :wink:
This circuit is my attempt to mimic the frequency and phase response characteristics of the original Peavey EVH 5150 head preamp section.
I also paid close attention to the clipping behaviour which occurs asymmetrically in the 5th gain stage first and then in the 4th...
22 Replies

22167 Views

View the latest post Re: BAJA EVH overdrive pedal …
Last post Lestad75
21 Feb 2025, 22:20
Baja B K Butler Tube Driver [documentation]

Last post by shredder « 21 Feb 2025, 09:08
Replies: 330
by bajaman » 12 Dec 2007, 07:22
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Rating: 11%

This is NOT a beginner's project.
This was traced from a recent B K Butler pedal and has the bias pot modification which alters the voltage on the cathodes of the 12AX7 tube.
You will need a suitable 12vAC power pack for this pedal - the original has a small toroidal mains transformer fitted internally near the front of the case.
The input and output sockets are isolated from the chassis by plastic insulating spacers. The earth pin on the input socket is connected by a parallel connected 100...
330 Replies

184660 Views

View the latest post Re: Baja B K Butler Tube Dri …
Last post shredder
21 Feb 2025, 09:08
Experimentalists Anonymous - Analog Bitcrusher

Last post by ~arph « 20 Feb 2025, 19:18
Replies: 17
by grrrunge » 09 Jan 2012, 05:28

Rating: 1.5%

Here you go! Vero is verified and all ;)
Sounds awesome...

I used 1N4148's and a 2N5457 instead of 1N914's and a J201. For some reason, using a 2N5457 seemed to let more sound through than a J201.

EA-analog-bitcrusher.png

17 Replies

5309 Views

View the latest post Re: Experimentalists Anonymo …
Last post ~arph
20 Feb 2025, 19:18
Clean on 2n7000

Last post by Vitallka « 16 Feb 2025, 17:17

by Vitallka » 16 Feb 2025, 17:17

Rating: 0.9%

Hello. I wanted to create a preamp on field-effect transistors so that I could connect various overdrives and fuzzes to it.
It turned out something like this:

To get 30V I used a module on XL6009. For now, this is an intermediate version, because I plan to try it with a bass guitar and, perhaps, some other moments.

0 Replies

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View the latest post Clean on 2n7000
Last post Vitallka
16 Feb 2025, 17:17
Peavey EDB1 active DI (verified)

Last post by andybot « 14 Feb 2025, 20:49
Replies: 7
by diskovolos » 22 Sep 2024, 12:02

Rating: 1.3%

Hi all,

My first try at tracing a circuit and third layout.
The circuit has an input + buffered output and an xlr ofc.
Versatile as it can be powered 9-16VDC or by phantom power.

The layout is verified , as I built it a few hours ago and works perfectly !

Peavey-EDB1-schematic.png

Row H can be ommited as it is not connected to any component.

Peavey-EDB1-layout.jpg

Cheers !

7 Replies

5544 Views

View the latest post Re: Peavey EDB1 active DI (v …
Last post andybot
14 Feb 2025, 20:49
Mystery Pedal (Overdrive?)

Last post by Manfred « 13 Feb 2025, 23:13
Replies: 13
by Sfincs120 » 14 Dec 2024, 19:33

Rating: 1.7%

Hello guys! 😄
I found this pedal sitting around in my drawer, something I got a while back from a friend who told me it was some kind of overdrive.

The pedal came with one knob missing and no labels at all. I tried to figure out what the knobs do and wrote down some labels I applied, but honestly, I’m not sure if I got everything right since I’m kind of a noob with this stuff...

Could someone help me figure out if my guesses are correct? In particular, I’m really curious about what the two...

13 Replies

3948 Views

View the latest post Re: Mystery Pedal (Overdrive …
Last post Manfred
13 Feb 2025, 23:13
Bagel - a soft but lightly toasted boost/buffer

Last post by earthtonesaudio « 12 Feb 2025, 22:29

by earthtonesaudio » 12 Feb 2025, 22:29

Rating: 1.3%

This is the most recent refinement of a generic boost/buffer circuit I've been using for a while. It's a soft clipping boost with a subtle crunch, like a perfectly toasted bagel. Bypass scheme inspired by Valve Wizard , diodes-to-ground soft clipping inspired by Thunderbird (and discussed in this thread ).

I used a 10k linear pot but a different taper (log or audio I suppose) would let you omit R6.
My schematic says opamp_quad but feel free to ignore that and use a TL071 or similar.
D5/D6...

0 Replies

1161 Views

View the latest post Bagel - a soft but lightly t …
Last post earthtonesaudio
12 Feb 2025, 22:29
BAJA Ampeg SVT bass amplifier pedal 9v 010418 [documentation]

Last post by boris_O « 12 Feb 2025, 13:51
Replies: 86
by bajaman » 01 Apr 2018, 08:40
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Rating: 16.2%

Here is the second installment of my bass amplifier series - the Ampeg SVT in 9v pedal friendly format.
Plug this pedal into any high wattage power amplifier and experience the Super Valve Technology sound without tubes :wink:
This design is based on the original Ampeg SVT but with the 5 frequency bands mid boost / cut rotary switch used in the later SLM MkII model.
I left the bass cut option in the ultra bass switch control out as well just as they did in the MkII :wink: However I modeled the...
86 Replies

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View the latest post Re: BAJA Ampeg SVT bass ampl …
Last post boris_O
12 Feb 2025, 13:51
Another modification of fuzzface

Last post by Vitallka « 11 Feb 2025, 16:55
Replies: 5
by Vitallka » 28 May 2023, 17:30

Rating: 3.7%

Hi to all.
Fuzzface has undergone so many modifications, so only mine is missing :D
I set out to redo the fuzzface in a way that would be easy to repeat and not sound as sharp as the silicon transistors. Therefore, I decided to add zener diodes between the base and the collector and it softened the sound. Also, the capacitor at the input is also of reduced capacity so that there is no excess of low frequencies.
Here is the modification scheme:

And here is the video:

Criticism and...

5 Replies

3473 Views

View the latest post Re: Another modification of …
Last post Vitallka
11 Feb 2025, 16:55
Core Shaper Parametric Eq [documentation]

Last post by szukalski « 10 Feb 2025, 13:20
Replies: 53
by dylan159 » 25 Mar 2021, 20:12
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Rating: 8.4%

After showing you a couple of not-clones, here's a more original circuit I'm proud of. It's a parametric mid frequency eq with also bass and treble controls.
I think equalizers are very very powerful effects, altough they shouldn't be overestimated when post production is an option. Usually diy-ing a graphic eq is hindered by the amount of controls needed for a decent amount of bands, being them pots or worse, sliders. So I wanted to look for an alternative, and one which didn't feel like a...
53 Replies

76476 Views

View the latest post Re: Core Shaper Parametric E
Last post szukalski
10 Feb 2025, 13:20
Wah wah footswitch "dead spot"?

Last post by Manfred « 09 Feb 2025, 23:29
Replies: 1
by soma89 » 09 Feb 2025, 22:12

Hey there,
Ive just recently got a Crybaby gc95 wah. Ive noticed that, when the wah is almost fully pressed toe down (trebly end) , just before clicking the footswitch and turning effect OFF - theres a space there that causes silence - no bypass tone or wah tone. I can sometimes hear it when rocking the pedal and getting too close to the trebly end or when turning off the pedal - theres a little brief cutting of the sound. A couple of time it actually was stuck there even after continuous...

1 Replies

554 Views

View the latest post Re: Wah wah footswitch " …
Last post Manfred
09 Feb 2025, 23:29
Shin-ei companion fuzz filter

Last post by Pirooz « 07 Feb 2025, 18:46
Replies: 5
by Pirooz » 05 Feb 2025, 17:57

Rating: 0.6%

Hi! I've found an interesting tone filter in the shin-ei companion fuzz, but i don't seem to understand how it works and what it exactly does. Could someone help me?

5 Replies

2016 Views

View the latest post Re: Shin-ei companion fuzz f …
Last post Pirooz
07 Feb 2025, 18:46
ross phaser in 1590a - SMD content

Last post by rocklander « 04 Feb 2025, 09:46
Replies: 9
by rocklander » 02 Mar 2012, 08:40

Rating: 1.5%

okay.. I was struggling to figure out how to make this happen, but Seiche helped out with his suggestion to flip the image (for fitting the SMD) and Fender3D helped out with his pulse LED mod (not included in the layout below, but this link explains it) .. there's a spot on the PCB for that trigger ...so thanks to you both.
here's the pics..
outs incl an LED to show it's enabled, and the right one pulses with the rate.

and the guts.. you can't see it from here, but because I had to flip the...

9 Replies

2989 Views

View the latest post Re: ross phaser in 1590a - S …
Last post rocklander
04 Feb 2025, 09:46
Soul Sonic - Crackle NOT Okay! [documentation]

Last post by Ayra « 01 Feb 2025, 00:49
Replies: 202
by soulsonic » 04 Jan 2009, 06:30
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Rating: 8%

Alright, I got it finally figured out... an SHO-style MOSFET boost with NO CRACKLE!!!
I came up with a new gain control for it that allows for the same range of gain adjustment without having to adjust the Source. Since the Source stays fixed, there is no crackling.
While thinking about how to solve this problem, I realized I could treat the basic gain stage as an inverting opamp. So, I set a fixed max gain and tried a variable resistance in series with the input and voila , works perfectly....
202 Replies

76042 Views

View the latest post Re: Soul Sonic - Crackle NOT …
Last post Ayra
01 Feb 2025, 00:49
Small Stone Clone LFO Question

Last post by Lani « 31 Jan 2025, 11:02
Replies: 1
by dbranger94 » 31 Jan 2025, 00:15

I'm designing on a Small Stone clone and I'm planning on using the LFO from a Tonepad Ropez. But, I am also using a vintage V1 Small Stone housing, so I want to reuse the C1M pot. If I'm reading the schematic correctly, all I need to do to keep the same rate is double the values of the two resistors coming from IC4b pin 9? The 4k7 and the 10k to ?

1 Replies

790 Views

View the latest post Re: Small Stone Clone LFO Qu …
Last post Lani
31 Jan 2025, 11:02
Precision Fuzz: TL431 based fuzzes

Last post by blackcorvo « 31 Jan 2025, 02:57
Replies: 16
by dylan159 » 24 Oct 2021, 10:25

Rating: 3.7%

Do you know what I like to do in my free time when I'm not making new circuits? Abusing for audio parts not meant for the purpose! Turns out the ubiquitous TL431 precision programmable reference (I have to thank that for how many I've salvaged so far) answers the can it fuzz? question with a surprisingly bold YES.
The idea came to me from the datasheet itself, showing a test circuit for voltage amplification. That looked surprisingly close to a common emitter amplifier, bias and all, which...

16 Replies

5472 Views

View the latest post Re: Precision Fuzz: TL431 ba …
Last post blackcorvo
31 Jan 2025, 02:57
Germanium and Silicon diodes comparison [documentation]

Last post by =AK= « 29 Jan 2025, 12:10
Replies: 45
by thomasbe861 » 13 Oct 2023, 10:01
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Long story short, I ended up testing and measuring a good part of all odd diodes I have had accumulated over the decades of tinkering.
Some are modern, widely available, some are more rare and not produced anymore, germanium, silicon, including Schottky, silicon carbide, Zener, LEDs, IR, etc.
Here are the graphs, showing the forward voltage drop for a given current (I-V curve) for different types of diodes. Hope this is helpful to anyone. All were measured using a Peak Atlas DCA75 Pro.

The...
45 Replies

44928 Views

View the latest post Comparison or Ge, Schottky a …
Last post =AK=
29 Jan 2025, 12:10

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