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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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Printed/Published Online Designs
Stompboxes circuits published in magazines, books or on DIY electronics websites.
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Last post Re: Engl e530 Fet
lutor
yesterday, 19:09
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.
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20 Topics

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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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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

220761 Views

View the latest post Re: THE ENGINEER'S THUMB... …
Last post jhergonz
20 May 2018, 18:09
Simple BBD Delay/Flanger

Last post by Lani « 19 minutes ago

by Lani » 19 minutes ago

Thought this may interest some of you.

0 Replies

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View the latest post Simple BBD Delay/Flanger
Last post Lani
19 minutes ago
EMG Active Pickup Circuit?

Last post by EddieTavares « Today, 16:28
Replies: 216
by soulsonic » 03 Nov 2007, 19:19
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Rating: 6.7%

I was wondering, does anyone have a schematic for the basic circuit EMG uses in their active pickups? It looks like it would be a hard trace since it's totally encapsulated in epoxy, but maybe someone has a factory scheme?

I've been looking at their website, and it seems like they give enough basic info to be able to reverse engineer a workalike. I'm gonna start messing with it this weekend. I have this idea for a project I want to do about DIY EMG-ing a passive pickup to work like an EMG. I...
216 Replies

114717 Views

View the latest post Re: EMG Active Pickup Circui …
Last post EddieTavares
Today, 16:28
Yet Another Rat (Rat with mods and blend knob)

Last post by EddieTavares « Yesterday, 11:29
Replies: 4
by CanisMajor » 08 Dec 2024, 21:42

Rating: 0.9%

I’m not a huge fan of the RAT, but I really like the circuit design and have built a few clones for people over time. I decided, however, that I’d build one for myself, incorporating all the basic modifications I know and adding a Blend knob as well. The result turned out quite nicely, and since I’ve been mainly playing bass lately, the Dry Blend seems to work great.

It’s still not my tone, tho :lol:
Here's the schematic with some comments (it might not be 100% accurate because I did a lot of...

4 Replies

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View the latest post Re: Yet Another Rat (Rat wit …
Last post EddieTavares
Yesterday, 11:29
The Nurse Quacktitioner: Nurse Quacky advances her career

Last post by lykwydchykyn « 09 Dec 2024, 06:04
Replies: 2
by lykwydchykyn » 27 Jul 2024, 02:17

Rating: 0.9%

The Nurse Quacky is a classic, fun-to-build envelope filter that requires no special parts and sounds great. There are a few mods out there like release time switching and whatnot, but I had a few additions I wanted to figure out:

- Filter Drive: Wanted to see if dirtying up this filter was an option.
- Q control: Nurse quacky gets a bit too sharp when used with fuzzed or waveshaped sounds, so I wanted a control to tame that.
- Inverted envelope: This was a stretch goal, but I'd used the NQ...

2 Replies

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View the latest post Re: The Nurse Quacktitioner: …
Last post lykwydchykyn
09 Dec 2024, 06:04
Buffer/Splitter with direct output and balanced output

Last post by ppluis0 « 09 Dec 2024, 01:32
Replies: 3
by cocnut » 07 Dec 2024, 02:33

Rating: 0.9%

Hi, I'm working on a project of simple DI Box with splitter/buffer functionalities.
The idea is to have a direct unbuffered output and some buffered outputs and ballanced output to send the signal directly to the mixer/audio interface. I want to plug it in somewhere at the beginning of my pedal chain using an input and a direct output, to affect the tone as little as possible, then use buffered output for some other purposes like recording clean signal on my laptop and an XLR output to send...

3 Replies

472 Views

View the latest post Re: Buffer/Splitter with dir …
Last post ppluis0
09 Dec 2024, 01:32
Germanium and Silicon diodes comparison [documentation]

Last post by Cub « 03 Dec 2024, 19:00
Replies: 44
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...
44 Replies

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View the latest post Re: Germanium and Silicon di …
Last post Cub
03 Dec 2024, 19:00
Pelota 2: PT2399 delay [documentation]

Last post by chip- « 30 Nov 2024, 17:49
Replies: 12
by dylan159 » 21 Jan 2023, 11:51

Rating: 6.3%

It’s been a couple of years since I’ve made the first Pelota delay: from the very name, it was a circuit inspired by a few popular PT2399 delays, such as the Rebote series, the Deep Blue Delay, and many others that aren’t that different to be worth mentioning.

Even then, with my more limited experience and knowledge, I knew I could try to do better, starting from the awful, noisy, high resistance inverting input stage you find in the vast majority of them that makes you wonder who did it first...

12 Replies

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View the latest post Re: Pelota 2: PT2399 delay
Last post chip-
30 Nov 2024, 17:49
Fred Briggs - Super OCD

Last post by blackboarcult « 30 Nov 2024, 11:09
Replies: 67
by briggs » 28 Feb 2012, 16:39
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From my blog:

The Fulltone OCD has been an overdrive favourite for many years now. It's got a really nice tone when your amp is set right (I prefer it with Marshalls I must say). Well, I've always thought about modifiying the basic circuit (which itself is based around the old Voodoo Labs Overdrive) to give it a little more variety and use over a wider spectrum of tones.

As you can see the Super OCD has a few extra controls:

- Firstly the Bass control - it's nicked from Paul C's Timmy pedal...
67 Replies

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View the latest post Re: Fred Briggs - Super OCD
Last post blackboarcult
30 Nov 2024, 11:09
Baja B K Butler Tube Driver [documentation]

Last post by Manfred « 22 Nov 2024, 21:10
Replies: 327
by bajaman » 12 Dec 2007, 07:22
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Rating: 10.4%

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...
327 Replies

155173 Views

View the latest post Re: Baja B K Butler Tube Dri …
Last post Manfred
22 Nov 2024, 21:10
I can't find information about this blues driver anywhere

Last post by thomasbe86 « 22 Nov 2024, 13:44
Replies: 8
by Serya » 18 Jan 2024, 08:03

No information at all, please help me.

8 Replies

2281 Views

View the latest post Re: I can't find information …
Last post thomasbe86
22 Nov 2024, 13:44
BAJA AC30TB overdrive pedal project 110218 [documentation]

Last post by イシカワ « 11 Nov 2024, 02:41
Replies: 73
by bajaman » 11 Feb 2018, 01:43
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Rating: 30.7%

You asked for it and here it is :wink:
The Vox AC30 Top Boost amplifier including driver and output stage in a convenient 9v dc overdrive pedal format :lol:
There are three places in the AC30 where clipping occurs at different signal levels - with input gain and tone controls on maximum reasonably symmetrical occurs first on the output stage at approximately 1.3mV 1kHz sine wave signal input level. At 2.8mV signal input the driver stage goes into asymmetrical clip at first and eventually...
73 Replies

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View the latest post Re: BAJA AC30TB overdrive pe …
Last post イシカワ
11 Nov 2024, 02:41
PUP: a host of Perfectly Usable Phasers [documentation]

Last post by Glad-Row4809 « 09 Nov 2024, 08:50
Replies: 69
by dylan159 » 22 Oct 2022, 09:52
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Rating: 8.2%

I’ve always liked phasers, in fact one of my first pedals I’ve ever built was a Phase 45 clone. Not only I liked how it sounded, another main reason for choosing it (other than the complexity) was that I only needed two matched JFETs instead of, for example, four for a four-stage phaser.
I’ve been sitting there, content with my box, for some years, until recently I’ve heard of the Project 447 phaser on an old ETI magazine. It wasn’t perfect by most accounts (the long string of 741 op-amps in...
69 Replies

15116 Views

View the latest post Re: PUP: a host of Perfectly …
Last post Glad-Row4809
09 Nov 2024, 08:50
Amp for sustainer

Last post by Jarno « 05 Nov 2024, 09:16
Replies: 1
by vprjs » 02 Nov 2024, 02:49

Hi. I still want to make a sustainer for my guitar.
I bought a single coil to use as a sustainer and some wire to wrap the coil to the required resistance.

Is the best value for a sustainer coil 8 ohms?

And I have questions, what amp should I try to use?

In the most famous page on the subject, the author uses a Fetzer/Ruby amp

Then I found modified version of Fetzer/Ruby amp
photo_2024-11-02_03-29-54.jpg

Also there is another site about sustainer, and author uses more complicated...

1 Replies

416 Views

View the latest post Re: Amp for sustainer
Last post Jarno
05 Nov 2024, 09:16
Keeley Katana Clean Boost (layout)

Last post by heyveno « 04 Nov 2024, 13:37
Replies: 6
by numaxim » 03 Sep 2018, 07:07

Rating: 1.7%

Goodmorning everyone!
I made a layout for the keeley katana. if any of you were to serve, I share the layout ..

have fun!

schematic&pcb_download

6 Replies

4407 Views

View the latest post Re: Keeley Katana Clean Boos …
Last post heyveno
04 Nov 2024, 13:37
Noisegate "Rauschgift"

Last post by toxonic « 29 Oct 2024, 12:50
Replies: 17
by toxonic » 21 Oct 2024, 17:39

Rating: 2.4%

Hi folks,
it's already nearly two years ago, when I bought my first pedal kit and made my first steps in building my own effects.
Since I have not so much time to practice i'm still a noob but i'd like to upload a circuit I've been working on.
I wanted to build my own noisegate and on my way I stumbled across some circuits to get started, but none of them really satisfied me completely.
Most of them suffer on an unnatural decay behaviour at higher release times.
I now built one by my own but...

17 Replies

2020 Views

View the latest post Re: Noisegate "Rauschgi …
Last post toxonic
29 Oct 2024, 12:50
BAJA boss PH-1 phaser build [documentation]

Last post by Gypsy Roadie « 23 Oct 2024, 04:22
Replies: 6
by bajaman » 20 Sep 2019, 01:31

Rating: 2.8%

Hi folks
A good friend asked me to build a replica of the BOSS PH-1 phaser recently - he had one of these back in the 70s and always regretted selling it. It is only a four stage phaser similar to the MXR Phase 45 and consequently is a very subtle effect and similar to a mild tremolo, but this is exactly what he was looking for. I set to work by resizing the Boss pcb layout to enable it to fit inside a 1590B enclosure. Here are some pictures of the finished product including schematic and board...

6 Replies

4745 Views

View the latest post Re: BAJA boss PH-1 phaser bu …
Last post Gypsy Roadie
23 Oct 2024, 04:22
Analog cab sim

Last post by J4mes « 22 Oct 2024, 00:51
Replies: 1
by caspercody » 14 Oct 2024, 16:41

Hello

I want to build an analog cab sim, anyone know a really good accurate schematic?

Also, anyway to create an analog cab sim based on a IR one might use the most?

Thanks
Rob

1 Replies

1105 Views

View the latest post Re: Analog cab sim
Last post J4mes
22 Oct 2024, 00:51
"That" compressor - good, easy, adjustable DIY compressor [documentation]

Last post by aquataur « 21 Oct 2024, 18:41
Replies: 10
by dylan159 » 01 Jul 2023, 22:36

Rating: 3.9%

I had wanted to make a compressor circuit for a long time, because it's a popular and somewhat easy to make effect, but the existing DIY offer left something to be desired. You should be ready to accept some compromise, in the form of: noisy and hard to find OTA chips; expensive and hard to find (in THT at least) VCA chips; hard to find (again in THT) and fiddly JFETs; circuits that underperform in some way or another, or; circuits that aren't well translated to instrument input and stompbox...

10 Replies

6159 Views

View the latest post Re: "That" compres …
Last post aquataur
21 Oct 2024, 18:41
JTEX Shockman - my modern take on the classic Rockman [documentation]

Last post by J4mes « 21 Oct 2024, 12:21
Replies: 21
by JTEX » 06 Aug 2021, 19:32
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I'm posting this here for the benefit of the community. It's my own idea of what a Rockman headphone amp should be like, made with modern, easily available components. It is intentionally not an exact clone of any specific Rockman model, because my aim right from the beginning was to make it better. I'd say it's closest to an X100 without the Echo part, but with a nice feature from the Soloist (the Doubler mode), and another really nice feature from the Ace series: single 9V battery power. I...
21 Replies

13050 Views

View the latest post Re: JTEX Shockman - my moder …
Last post J4mes
21 Oct 2024, 12:21
Soul Sonic - Folk Driver, The Honey Bee Challenge!

Last post by ding127063 « 17 Oct 2024, 11:52
Replies: 72
by soulsonic » 19 Apr 2009, 07:52
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Rating: 3.9%

Hi everyone, as I'm sure many of you know, Björn Juhl sent me a Honey Bee pedal to play with. The idea was to listen to the sound and see if it can inspire a nice DIY project. Well, after spending some time with it, I've come up with something that sounds good and will certainly remind people familiar with the sound of the Honey Bee.
My goal was to keep the design as simple as possible, but still try to fit in some tricks. This uses both positive and negative feedback to get its sound. R8 is...
72 Replies

20617 Views

View the latest post Re: Soul Sonic - Folk Driver …
Last post ding127063
17 Oct 2024, 11:52
Demo amp

Last post by mauman « 07 Oct 2024, 18:41
Replies: 4
by vprjs » 07 Oct 2024, 00:27

Rating: 0.9%

Hi there. I want to build a sort of demo amp . I want to use it to try circuits on a breadboard. I found 4 inch regular speaker. And want to put a ruby amp inside. Do I need to add a low pass filter to this circuit to cut non-guitar high frequencies?

4 Replies

859 Views

View the latest post Re: Demo amp
Last post mauman
07 Oct 2024, 18:41
BAJA REACTOR 010119 [documentation]

Last post by tuck « 07 Oct 2024, 07:39
Replies: 78
by bajaman » 01 Jan 2019, 06:47
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Rating: 22.5%

Happy New Year to all the good folks here at freestompboxes.org.
Here is a new design that I have been working on over the last few years - a pedal designed to mimic the performance of a typical negative feedback tube amp power stage driving a Celestion quad box or similar.

The pedal has the negative feedback presence and depth (resonance) controls typical of Soldano, Marshall, Fender, Peavey etc.

Tube power amplifiers have a high output impedance compared to solid state class AB and digital...
78 Replies

83697 Views

View the latest post Re: BAJA REACTOR 010119
Last post tuck
07 Oct 2024, 07:39
Another modification of fuzzface

Last post by Vitallka « 06 Oct 2024, 18:11
Replies: 2
by Vitallka » 28 May 2023, 17:30

Rating: 3.2%

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...

2 Replies

2349 Views

View the latest post Re: Another modification of …
Last post Vitallka
06 Oct 2024, 18:11
Simple Buffered Splitter

Last post by J4mes « 02 Oct 2024, 18:00
Replies: 14
by culturejam » 30 Aug 2011, 15:29

Rating: 2.6%

This is a very simple buffered splitter project. You can use it to create two equal outputs for your guitar or another pedal. This is handy for running a stereo amplifier setup, splitting a single signal into two effects pedals, or any of several other applications in which you need to have two equal, buffered outputs. The circuit consists of a simple transistor input buffer that feeds a pair of parallel op amp-based output buffers.

From an EE perspective, this isn't a perfect circuit. From a...

14 Replies

6645 Views

View the latest post Re: Simple Buffered Splitter
Last post J4mes
02 Oct 2024, 18:00

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