So with the release of the Lizard Queen, I decided to take it as a challenge and design my own octave fuzz in the same vein as something from the 70s, with minimal parts and following EHX design standards of the time. I decided to also go with the Green theme and used the Green Ringer circuit as a base for the design with some tweaks. I rather like how it turned out, and it does light octave to pretty gainy fuzz octave and it has a boat load of output too to drive your amp. I also added a tweak...

Hi everyone,

although I am already have a clone of the BOR, I wanted to build one without boost and I had created the pcb with the following wiring

Initially it didn't work then I looked at my clone's pcb and realized I had to reverse lugs 1 and 3 of the tone pot and it started working but with poor distortion, then I replaced Q1 with a 2N7000 and it worked fine, too if with slightly lower volume than my clone, but then the next day I don't know why but it suddenly stopped working, no...

Hello future home to my serious nerdy mind :)

I'm pretty new to circuitry. I have built some kits and recently re-housed and modified a JHF1 Dunlop Fuzz Face. Works awesome. I'm a germanium transistor collector and have learned a bunch over the past year. I just bought a Newmarket Transistor amplifier circuit (pre-made) from the 60's. The Reverb ad said something about being a Deacy amp. It has a basic schematic diagram for the wiring but I've tried a bunch of different things an I can't get...

I want to build a Tim using Dirtbox layout at and see conflicting informations on the JRC 4558 vs 4559:
According to this page , the only difference would be the slew rate (1 for the 4558 and 2 for the 4559), so that a 4558 would be a poor substitute for a 4559 in this application, right? If so, what would be a proper alternative?

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...

Peavey, Pavey, Pevy, or is it Pee-vee? One of my favorite amplifiers is still to this day the Peavey Bandit 112 I was gifted for a birthday. That was my first actual guitar amplifier, but even after having the chance of playing and owning fancier, more expensive, more tube amplifiers, I still come back to this one once in a while. Having made a cab sim, I thought it would be nice to have a pocket size version of the pre-amplifier to use with it without bringing the whole amplifier with me....

Hello all,
just to let you know, if like me you use eagle for pcb design and download a lot of footprints from snapeda. I noticed , already 2 errors:
1 the 2N5172 transistor footprint is wrong: EBC instead of ECB (the probably copied a generic 2NXXXX footprint)
2 I tried a 3 colors LED footprint, but when I open it on eagle the pads overlap...
So double check everything before making a PCB...

Cheers
Benoit

Shub-niggurath - Lovecraftian deity called also black goat of the woods with thousand young

Second one in series, based on the EQD Hoof traced by Kit Rae at
It has FET blend circuit and Mpsa18 placed in Q1, Leds are Green for Q2 and Orange for Q3, also it has some slight changes in tone stack.

Whole project with gerbers: Shub-niggurath project on GitHub
PCB was tested and assembled and its working.

schematic and assembled pcb:
shubniggurath_schematic.png
shubniggurath_assembled.jpg

Hello, this is my first time posting and I'm not sure if this is the right place to do it. I tried to register with DIYstompboxes but the registration confirmation email never got through despite many attempts.

I am an amateur circuit enthusiast. I designed the attached harmonic tremolo circuit from scratch. What makes it different from other harmonic trems I have seen is that rather than always having the high and low pass filter gains oscillating 180 degrees out of phase from each other,...

I've been inspired to create more stuff in the vein of EHX, this is my take on the LPB-1 circuit. It has a bit of bass roll-off to be less muddy with humbuckers but still be beefy enough for a tele or strat. It's an amp driver first and foremost with just slight coloration. I added an extra switch to add some compression with some current feedback, and a gain control to give some extra boost/dirt. I chose BC107B as they are still readily available, but you can also use 2n5133 for more EHX mojo,...

Hello Everyone,
I have been lurking here many years, actually thought I had registered, but anyhow, here I am.
I'm building this version of the ROG Supreaux Deux. I see there is a Hi-Lo switch there, what is this for?, saturation or EQ?
thanks!

King in Yellow - distortion based on Exar Super Fuzz sf-2 schematic by @VitaliiBobrov -> SF-2 tracing
Original pedal was created by Polish company Exar Electronix (Janusz Raczyk and Leszek Gruszka)

It was my favourite pedal in the past for both guitar and bass and it was even better after some mods - like germaniums as clipping diodes, changing opamp..

and what i promised - here is whole project with gerber files: King In Yellow Project on GitHub

PCB was tested and assembled and its...

hello guys!

i built one and sounds pretty good but there is not enough gain.... i measured the resistance across the gain pot and it shows around 45K (some parallel resistance?), after that i disconnected the gain pot entirely and measured the resistance between IC pin1 and pin2 with the same reading....what could be wrong here.....
Thanks in advance

bonson.PNG

Hello, this is a circuit based on the Benson Preamp, called the Bonson praemp, because I'm refusing to call it a preamplifier. This is part of a streak of me going through circuits I see and even like, to conform them more to my standards while trying to keep the same timbre and character. A more thorough explanation is give at the beginning of the Clown thread .

Up for some circuit analysis? The Bonchild (name changes every time, it's a rule) consists of the same building block...

A simple boost/preamp circuit I put together recently. The JFET starts to clip in a pleasingly smooth manner if you really dig in so the gain control allows you to set how hard you need to play to make this happen. The simple active two band EQ gives a nice range of tones for not many parts.

FETBoost_schem_nocentelli.bmp

Good morning or evening friends depending on how the case may be.
I have not been able to play for a while but I was digging up some of my old stuff while I was going through chemotherapy.

I've forgotten about this wonderful little practice amp that I built on a piece of purfboard.
I have a problem with my hands so please cut me some slack on the drawing.
It was the easiest way for me to do it and also hopefully it shows a little bit easier for people who are newer.
Before I get into the...

hey guys,
any help would be appreciated...
i built a Diaz Texas Ranger Treble Booster. i used the exact part values and i got the proper bias voltage but it sounded to me more like a mid boost with a volume boost rather than a treble boost. and it barely distorts by itself...why is that and is it normal?

MOSFETs, the incredible devices at the core of modern devices, computers, power supplies and… distortion pedals? For some reason, there’s this constant fascination with them: regardless of them being used as diodes, amplifiers, inside op-amps or inverters or even in output stages, the presence of MOSFETs somewhere confers the circuit a powerful charm and the inevitable association with the seemingly unrivaled sound of vacuum tubes.

That said, very few circuits have attempted to use active...

Hi all, this project was one that I wanted to do for a while. It's been pretty fun digging into how oil can delays work and sound. Don't Tell Ray has a front end that can get gritty and dirty, a sinusoidal LFO, modulation speeds that match the hardware, and a tone control that allows the delays to stay nice and clean or dark and mellow. I have a full rundown of how the circuit works on my page about it here: Here is the demo:

Hi Folks
Merry Christmas to all :thumbsup
Here is a little something that i have been working on for some time - it is very low noise, extremely easy to customise and it does not use an inductor.
I built mine on a piece of stripboard - I may design a pcb for this in the new year. I used a OPA4134 quad opamp but a TL074 or two TL072 opamps should work fine - the choice is yours :wink:
I have suggested components that can be altered to zoom in on your favourite wah response. (I am currently...