Hello everyone. I need your help. I finished this pedal from this schematic, and I have a problem. when i touch the tip of the plug the amp sounds, even when i move the potentiometers everything seems to work, always when i touch the tip. but when i put the plug in the bass, there is no sound. I double checked all the components and everything is fine. The only problem I noticed is that when I plug in the passive/active switch, the pedal doesn't sound at all (even when I touch the tip of the...

I have a unit where the Regen knob is going haywire. No matter how much I turn the Regen, it always product endless repeats. Any idea what could be wrong?

Hi,
I disassembled a Rocktron Surf Tremolo with the problem that you can see in the video:

The problem hapens even in bypass, it was just a kind of amplified when the compressor is on.

It was not an easy pedal to disassemble, and the board its heavy populated mainly SMD components....I will need some help, and if anyone have the schematic...

Thanks

Guitar Preamp HE 11-79.pdf

Guitar Preamp HE 11-79 01.jpg Guitar Preamp HE 11-79 02.jpg Guitar Preamp HE 11-79 03.jpg

Hello everyone, everything good? Does anyone have a PDF of the original Marshalll 1959 SLP PCB with values ​​and board design?
measurements too
I'm finishing drawing and I would like to have this PCB. grateful

ps: I will post here update.

Hey everyone!

First time poster here, just wanted to share my findings from tracing the new Orange Amps Vintage Reissue Distortion pedal.

Orange Vintage Reissue Distortion.png

Right off the bat, the actual distortion circuit here is very similar to ye olde Wampler Plexi Drive, but with a few tweaks. The tonestack circuit here is lifted from a Marshall amp (weird, considering this is an Orange Amps design) & there's a pretty neat buffered bypass switching system going on. Interesting to...

Hello, here's Juliusz from BCS. I thought I'll share some schematics of my discontinued pedals for anyone fancy diy.

Here is GT420 MK1 model (current MK2 version is completely different circuit-wise). It's a LM386 based distortion with a fat silicon Rangemaster in front. What was neat in this particular pedal was hitting 386 not with a boosted signal, but feeding it with already dirty and compressed signal. This caused a rich, powerful distortion with reduced typical farting-out sizzly sound...

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...

Hi, i have this headphone amp for a while and it was working fine until i plugged jfet boost into it. From that time it distorts signal in very bad way when i have bass on max, when i turn down volume it gets better but it lacks volume for headphones, i tried to change batteries but it didnt help. Any schematic or idea what could cause that problem?

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...

Hi all. I am having some issues with my Wolfgang 61 build. I posted on Reddit and I'm trying to repost here for help. There's a video posted over there that clearly shows the issue:

TLDR:
L channel seems fine, R channel seems ok until input gets too hot and then sounds blown out. Overall both channels have a noticeable volume drop from clean.

Hi guys,

I'm corrently working on the Chopper Party Device:

I was wandering what are the 6 lugs connection points (A-0; B-0; C-0) on the PCB next to the Rate Pot of the Phaser and A-T; B-T; C-T) on the Tremolo side. Is this for a normal stereo jack socket to change the rate via expression pedal?

How do I connect the stereo jack? Where is sleeve/ground, ring abd tip?

Thanks in advance

The schematic for the other bass preamp by Alembic, the F2b, can be found quite easily on the net, but I hadn't earlier seen the schematic for the F1x.
The product blurb mentioned something that to me pointed to integrated filter IC's like the UAF42 (although that is reported to sound not great ), but apparently not :)

Alembic F1x schematic.png

This one is not your usual stompbox, as it is designed to use with a vocal mic. I was looking for a death by audio echo master schematic, with no success.
And yesterday a friend of mine bring me this boutique clone edit: looking at this thread: I realised the term clone doesnt really apply here (use of transformers etc) but the main idea is the same. It´s basically a mic preamp with an effect loop for stompbox and a build in delay. I think the mic pre and loop could be interesting for everyone...

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,...

hey guys, first feel free to move to the correct location of this post.

I'm thinking of making a buffered volume pedal, is it correct to do it this way?

I put the 250k potentiometer between the buffers. which potentiometer ideal for this circuit?
thanks

see also:

Modify Guitar Sound.pdf

Modify Guitar Sound 01.jpg Modify Guitar Sound 02.jpg Modify Guitar Sound 03.jpg Modify Guitar Sound 04.jpg Modify Guitar Sound 05.jpg

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...

Intro

Hi everyone! I had the chance to get my hands on the MXR Doubleshot for a little while, and found out there are no available schematics anywhere. It's nice to do some selfless circuit tracing once in a while, in the true spirit of FSB.
Starting from what was known already, the Doubleshot is usually described as the dual channel version of the Dime, and we'll see this is accurate. That circuit already has something interesting in its own right, but this one builds upon it with the...

pls delete

Hello
Since high beta germaniums become so expensive Im searching for germanium transistors with low hfe and leakage. Do any of you know what russian models to search for??

Like like 1-10 hfe maybe at most 20
And 1-30ua leakage, the lower the better

Its for distortion pedals and the low leakage is the most critical since i use them in darlington configuration

I”’ve hade excellent results with af239 and a few other low leakage AFs with zero to 20ua leakage.

Sorry for my bad english

When I was in highschool in the mid-1990's, one of my bandmates got a brand new Turbo Rat. I was surprised to see that it didn't have the same kind of footswitch as my Rat 2 (also bought new around the same period, probably 1994). His Turbo Rat had a plastic soft touch footswitch like this:

I later saw this same style footswitch on my Roadkill. We now all know that the Brat/Roadkill used electronic FET switching like a Boss/DOD pedal. Now I'm very curious if there was a short-lived version of...

Radiopratica 1971_09 Camero Distortore.pdf

Radiopratica 1971_09 Camero Distortore 1.jpg Radiopratica 1971_09 Camero Distortore 2.jpg Radiopratica 1971_09 Camero Distortore 3.jpg Radiopratica 1971_09 Camero Distortore 4.jpg Radiopratica 1971_09 Camero Distortore 5.jpg

Figured I’d take a few pics of this before I let it to. Not a bad sounding unit at all. Darker than most pt2399s based delays I’ve used but it has a darker vintage analog delay tone “think dod FX90 or any old Reticon units pushed to their max. Modulation was also nice. Just have too many delays. Only changed I noticed with the chips is a tl072 used instead of a burr brown. Even has voltage regulator and preamp trim.

Tecnica Pratica 1965_12 Ampli transistore tremolo.pdf

Tecnica Pratica 1965_12 Ampli tra 01.jpg Tecnica Pratica 1965_12 Ampli transistore tremolo 02.jpg Tecnica Pratica 1965_12 Ampli transistore tremolo 03.jpg