Traced from a 2004 unit.

Clearly based on a tube screamer with some interesting addtions/changes. With my set up the Phat switch doesn't do much.

There is no pull down resistors. The Bias rail isn't at half the supply. The last half of the 2nd op-amp is not used.

I can't add the schematic so here is a link to my reddit post with it attached.

Hey everyone,

I wasn't sure if I should have posted in the old Hudson sidecar thread .

In 2024 Hudson Electronics introduced the Motorcycle as a limited edition:
The Motorcycle is a modified version of our Sidecar overdrive pedal – our take on the soft clipping overdrive circuit with the added versatility of a powerful two band EQ which draws inspiration from a vintage recording console.

I have built many pedals, but I have never drawn a schematic before. I did my best to identify all the...

Hello.
I traced a DemonFX Omicron Darkglass that appears to be a copy of the Omicron Darkglass Alfa. I ordered a few PCBs with the schematic I traced, and it works just like the original (Demonfx). The only thing I have changed is the switching bypass, which I have made truebypass (the original used a CD4003 and JFETS). The rest, as is. Here is the schematic, in case you are interested.

Helloooooo,

I checked the connections twice and also double-checked the values. The numbering doesn't follow the PCB at all because the PCB numbering is buried under the components.

Here the voltages, all measured against circuit ground (not DC adaptor ground), pedal on, switches off, knobs at 12 o'clock

U1
1 4.73
2 4.73
3 4.67
4 0
5 3.88
6 3.90
7 3.90
8 7.77

U2
1 3.82
2 3.82
3 3.79
4 0
5 4.51
6 4.74
7 4.74
8 7.77

U3
1 3.88
2 3.88
3 3.87
4 0
5 3.81
6 3.83
7 3.83
8 7.78

Q1 J175 Pedal ON
D...

Hello, for everyone that loves Tone Bender MKII, here's some new stuff from Sola Sound that can maybe help avoiding the germanium instability, at least for a good measure.

I've drawn the layout (which is the same of the classic layout) according to the photos I've found here and there. It shows with some bias resistors changed and some corrections on the frequency cut for compensate the silicon brighness.

More info at

Q1 is a germanium AC127 (supposedly quite leaky), no info around Q2 and...

This is vero schematic :D
I have 2 questions
1) DA 1.1 Whether it is an obligatory part of the circuit or just closes the second half of the chip
2) DA 2.2 The voltage divider is perfectly capable of operating without a chip, why is it here?
P.S.
JFET КП303А, D7,C12,R34,R42,LED,D11 Must be removed if you want true bypass.

20250129_125516.jpg 20250129_125539.jpg 20250129_125552.jpg

What in the world is this pedal? The housing is an EBK pedal, one where I can't even identify it. The guts are handwired, and I already removed a ton of silicone. I'm assuming some kind of compressor, but one of the switches doesn't even feel like it does much.

Hi all,

Here’s another traced Landtone (TTone, USDream) schematic This one is for the Landtone Fuzz.

LandtoneFuzz.png
LandtoneFuzzMarked.jpg

This one is component for component identical to the EHX Op Amp Big Muff Pi as drawn in this forum here , save the initial power noise shunting cap (C10 in my drawing, C13 in Gottfried Divos’), and the volume pot (10k-B instead of 100k-B). The pot is RK097 style if you would want to change it out. The cap is fine as it is.

I think the lack of a...

TLDR: Here is the schematic for the Landtone Delay pedal. It is a Tonepad Rebote 2.5 . I’m not sure you call it a clone if the original pedal is a DIY pedal.

This is my second trace here. I’m waiting for the paint to be finished on the first one I traced and built. It would be really nice if Landtone included the drawings with their pedals – but hey, cheap stuff from China, right?

I’ve physically traced the entire circuit.

I made sure to label the PT2399 U2. All delay chips should always be...

We usually include schematics in the user manual. We weren't able to do that this time because the user manual had to be small enough to fit into a box only slightly bigger than the pedal, and the schematic would have been illegible at that scale. I'll eventually get around to uploading the schematic on our website. In the meantime, here it is.

Wattson-EFY-6.jpg

Ok, so this is obviously the Shin-ei FY-6 circuit with a few relatively simple mods. I'll explain each of them.

First, you'll...

Merry day before Christmas and Happy Day before Hanukah everyone!

TLDR: Here is the schematic for the Landtone Distortion 1 pedal. It is based on the MI Audio Crunch Box V2 .

I’ll introduce myself a little first. I just built an AionFX Andromeda and I am hooked. I am not new to schematics, audio circuits, electronics, electronic and PCB board repair, or CAD. I am brand new to guitar pedals and EDA software.

I got some Landtone pedals on a Black Friday special on AliExpress and I’ll be...

I've been tinkering with my DHA VT dual custom for a while and thought I'd post some shots of the board to allow folks to have a look at Dave's lovely work.

VT1 Front JPEG.jpg

VT1 Back .jpg

I've rotated the pictures so that the Inputs are on the right hand side in each picture.

Considering only about 50 of the Rockman Ultimatum Distortion Generator pedals were ever released, and having gotten my hands on one for a time, I thought it wise to trace and verify the circuit. I spent a good amount of time, coincidentally with Robert (@PedalPCB) doing a trace of the same pedal at the same time, I took the time to breadboard the circuit based on the trace I made - but without the low-battery and buffered-bypass sections.

The complete set of notes, layouts and schematic is...

It didn't seem like anyone had attempted this one aside from the photos in this thread , so here you go.

Schematic:
keeley-compressor-plus-trace-schematic.png

Full tracing journal here:

PCB available here:

He sorts his germaniums into low, medium, and high gain. Just wondering if anyone knows what the gain ranges for each of those are? Is his low gain 20-30uA, 30-70uA? Seems like one person's low gain could be another person's medium.