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...
Hi! I've found an interesting tone filter in the shin-ei companion fuzz, but i don't seem to understand how it works and what it exactly does. Could someone help me?
I sent a bunch of pics to AG a while back, but I know he has a lot more important things to worry about these days...
Unfortunately I dont have wiring photos (and I can't remember the name of the guy who sent these pics to me....) , but these should get us close. We'll just have to make an educated guess about the pot values and wiring.
My first try at tracing a circuit and third layout.
The circuit has an input + buffered output and an xlr ofc.
Versatile as it can be powered 9-16VDC or by phantom power.
The layout is verified , as I built it a few hours ago and works perfectly !
Peavey-EDB1-schematic.png
Row H can be ommited as it is not connected to any component.
The interesting thing is the case looks like a Maestro Fuzztone clone - inside it doesn´t match with the Sekova´s or anything else - especially because there are 2 Ge-diodes visible.
Any infos are welcome,
analogguru
apollo FAII unbranded 01.jpeg Apollo FAII unbranded 02.jpeg Apollo FAII unbranded 03.jpeg Apollo FAII unbranded 04.jpeg Apollo FAII unbranded 05.jpeg Apollo FAII unbranded 06.jpeg
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.
okay.. I was struggling to figure out how to make this happen, but Seiche helped out with his suggestion to flip the image (for fitting the SMD) and Fender3D helped out with his pulse LED mod (not included in the layout below, but this link explains it) .. there's a spot on the PCB for that trigger ...so thanks to you both.
here's the pics..
outs incl an LED to show it's enabled, and the right one pulses with the rate.
and the guts.. you can't see it from here, but because I had to flip the...
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
A friend has just brought an article in the latest issue of Elektor which publishes one of my circuits under some else's name! The original scribbled diagram is attached below. I'll put a nicer version up later, with the PCB details and the off-board wiring. It uses a single 9V battery to get up to ~17V p-p output, which is great going into a valve amp! It's a clean boost, so should be used just before the amplifier - you really don't want to put 17V p-p into your other pedals!!!
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...
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...
Hello guys! 😄
I found this pedal sitting around in my drawer, something I got a while back from a friend who told me it was some kind of overdrive.
The pedal came with one knob missing and no labels at all. I tried to figure out what the knobs do and wrote down some labels I applied, but honestly, I’m not sure if I got everything right since I’m kind of a noob with this stuff...
Could someone help me figure out if my guesses are correct? In particular, I’m really curious about what the two...
Alright, I got it finally figured out... an SHO-style MOSFET boost with NO CRACKLE!!!
I came up with a new gain control for it that allows for the same range of gain adjustment without having to adjust the Source. Since the Source stays fixed, there is no crackling.
While thinking about how to solve this problem, I realized I could treat the basic gain stage as an inverting opamp. So, I set a fixed max gain and tried a variable resistance in series with the input and voila , works perfectly....
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.