The research folders: please contribute whatever little piece of information you might have on stompbox circuits new or old. Discussion should be civil and to the point.
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Vintage Stompbox Corner ( ... - 1975) Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
Boutique Stompboxes dissected... General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
DIY Projects 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. Subforums:
Printed/Published Online Designs,
Original Tracer Layouts
Analysis Requests Folder Before you launch a request, please a) search the forum; b) search the web and c) share whatever you did find and where you searched.
I've recently noticed that Tim's great site at is coming up as a virus, trojan horse, or other bad things in my browser. So I thought I'd grab all the circuit images and zip them up for safe keeping. I have emailed him in the recent past, but there has been no reply. :hmmm:
Attached is a zip file of ALL of the effects circuits from his site.
Rock on, and may the creative spirit of the Great Escobedo be with you always. :thumbsup
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
This section is devoted to circuit analysis . This means...
requests for schematics or layouts will be moved the the Request section
messages about your sick puppy or your new Android powered phone should go into the FSB Café
debugging questions will be moved to the Workbench
useless post (containing no extra information) may get deleted to preserve the readability of the thread.
you should check whether a thread exists about the unit in question, and add your info in that thread.
you...
Don't post in this forum asking is there is a schematic or layout or info on XXX pedal.
There is a subforum setup for requests already. It is located here:
REQUESTS FORUM
Any requests posted here will be moved to proper sub forum, and I'll also make nasty remarks about your mother. :mrgreen:
also, if you have a problem with your build, post it in the WORKBENCH. these threads are for circuit analysis only. by all means, if you discover something we should...
Here's a trace of a J. Rockett Tim Pierce signature OD that I had on hand. It's a dual pedal with a four-knob OD followed by a MOSFET power amp boost. This PCB is stenciled rev 5 and the pedal dates from 2015. This post is mostly for curiosity's sake since I couldn't find an existing trace. It's a decent but not spectacular pedal and there's nothing innovative inside.
TimPierce8.jpg
TimPierce7.jpg
Tim Pierce OD Analysis.jpg
Tim Pierce OD schematic.pdf
The most interesting thing about...
I have an Blackstar HT Dual pedal Im trying to fix. I purchased from eBay. Shortly after I noticed a problem in the switching. Negotiated a 50% reduction on the basis I would fix. Im not a pro but have built fx and fixed amp problems before so am confident in tackling this.
Wanted some advice before I open the box though.
Symptoms are...
Unit always works in Bypass
Sometimes either green, red (or both) channels are silent.
Sometimes the volume of green or red channel will dip randomly....
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...
INTRO
Hello everyone. The Blues Driver always pops up among the most popular overdrive pedals, no doubt because many people like how it sounds, but also because it's easy to find and relatively affordable, being from one the biggest pedal company in the world. It's not as popular in the DIY world, aside from mods, probably because it's not the smallest circuit and uses many transistors in a discrete op-amp configuration. Also since you can get it anywhere for cheap, I guess most people just...
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
I've played these a few times and always liked them.
The usability is insanely bad, you have to have fairy fingers with the stock knobs in order to use the second gain knob. The stompswitches are way to close together.
Anyway, I found one used and picked it up. Was surprised to find mostly through hole components, and pretty well made. Not surprised at all to find a sanded IC. :roll:
I started to trace and to be honest with y'all, I got bored. I did find a few discrepancies with the RC...
Hi guys,
I was just reading a lot of topics and I'm looking for clues to repair my EHX Memory Boy.
It was stored for some years, and now i can't get any effect out of the pedal, i already tried battery, and AC, and the behavior its the same, i can turn it on and off, i have sound, but no effect...
Delay and Depht doesn't affect the sound and blend and feedback just do some type off modulation turning the sound imperceptible.
I've been hunting down this pedal for a while after EQD featured it on their youtube channel.
This is second version, 350 made for prymaxe. There is a V1 of which only ~20 were made.
zapmachinev2.jpg
PCBtoptraces.jpg
PCBbottraces.jpg
Here is my guess for V1 based on the screenshot below from that youtube video. THIS IS AN APPROXIMATION, USE WITH CAUTION.
Specifically, I'm not sure about the emitter connection for Q2, either the 1K or 470R might be an emitter resistor....
Hi, gang! Here are some gut shots of my Memphis Tremolo modulator, and also an x-ray component side shot of the PCB showing parts & placement. I have seen gut shots of many other Memphis pedals online that use the exact same PCB! VERY clever engineering! I had originally intended to draw up a schematic also, but I'm too lazy to do that by hand anymore. Perhaps a group member might suggest an intuitive (like: drag and drop schematic symbols from a list) program for drawing schematics?
Hey lovers of the deep tone,
attached you can find my attempt to trace this big tank.
It's my second attempt to trace a pedal so please be kind. I used a continuity tester and the magnifying glass app with the flashlight of my cell phone to get it done. The schematic is made with Kicad.
Unfortunately I don't have a lot of knowledge in electronics. I don't now exactly which component is part of a feedback loop and which is a high pass etc or (and) especially for this pedal which component is...
Box of Rock variant, with minor changes to cap values Q2/3 source resistors and D-G bias resistor of Q3 so would be quite possible to do a BoR/'59 Sound mode switch with a 4P3T rotary.
I like this more than i remember liking the BoR when i made one years ago, but i just don't like having a single BMP style tilt tone pot and am considering putting a Bassman tonestack on the end instead - If anyone has any advice/suggestions/experience of doing...
Hi Guys,
yesterday a frind of mine give me a Darkglass Duality to try.
I just opened it and shoot some pictures.
It is based on 4049UBE CMOS.
All Pots are 100kB except for the Level Pot which is 100kA.
unfortunately I cannot hold the pedal so I will start tracing the pedal from the photos. In the next few months I will have the opportunity to have the pedal back in my hands and check all the connections. If someone has the pedal and wants to help me, you can write to me in PM.
Would anyone have a schematic or service notes for the Boss DD-6.
I bought one over the weekend. Totally dead as described.
No light or sound at all.
Hoping it's just a power problem. Found a post on another forum that suggests it could be the IC6 5v regulator. Will check that first. As well as checking all the power rails are correct.
There are some similarities to the dd7 but feel like im flying on the dark without a schematic.
Can find the dd3, 5 and 7 but not 6.
Does anyone have it?
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