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...
Anybody got any information on that pedal? I saw a demo of it the other day and it sure sound great...I mean the Pete Thorne demo not the 1000 different chugga chugga demos.
Sound like a hot rodded TS with a MRX gate in series...from the gut shots I found I would not expect it to be a decimator circuit, the board is just so small. Of course I may be mistakin' it's all smd after all.
Hello. I'm running out of ideas for bass pedals, so I thought I'd come up with something. In principle, I wanted it to be on field-effect transistors 2n7000, and not on operational amplifiers. As a result, the pedal received 4 controls and one switch (it controls the midrange cut). There is also an opportunity to amplify the clean signal to some extent - this is present in the video.
Hi guys, i really appreciate some help here.
I have an EHX Freeze with PCB Rev B.
The Pedal was working intermittently, and after i disassembled it i noticed two major problems:
- Broken Toggle Switch;
- Footswitch with signals/marks that has been opened before.
After some research i ordered the exact same parts:
- Toggle Switch: 2MD3T1B1M2QES (on-Off-on)
- Momentary Footswitch SPDT On-Momentary On 3 Pin PCB Mount.
I carefully dessolder the old ones, and mounted the brand new parts, and like...
hello folks, i found this schematic on the web for the Aguilar OBP3 preamp, i want to use B100k pots for the eq but i don´t know exactly which resistors and capacitors i need to scale, as you can see is not the classic baxandall topology, could someone guide me please? thanks in advance
Not sure what this is supposed to be a clone of. Some claim a Blue Hippo but I’ve never tried one. However I have tried many chorus and am an electric mistress fan and this has that “metallic” sound similar to the small stone and electric mistress. With the knobs set very low and kind sound similar to each. Also does a good faux Leslie. It does have a volume boost when engaged and it also must have a longer than usual delay set time because it’s almost like a doubler or even very quick slap...
Hi to all. I wanted to make some kind of guitar overdrive or distortion on 2n7000 field effect transistors again, but the power supply should be 18V - so the sound is more dynamic. And something like this came out after some modifications:
Hi folks
Here is my latest offering to the community - a revised version of my LA2A style optical limiter.
this time I have built it on one board (board is flipped too).
One thing i noticed when I powered this from a small 500ma 9v switch mode power pack, was a very loud white noise. At first I thought I had a noisy op amp but this was not the case. The solution was to replace the polarity protection diode with a 100 ohm resistor and decouple the output side with a 220uf electrolytic to ground...
Another Exar pedal trace, Exar SF-02 Super Fuzz. I was lucky to have a friend in Austria who helped to get this one for a reasonable price. The unit seems to be produced in 1997 or later, as the latest date on the potentiometer was '97.
PXL_20221227_125404729.jpeg
PCB is standard for series 2 Exars - single-sided, visible in the light.
I'm looking for help on a specific split humbucker wiring. I have experience building and modifying guitars, but I've always used a pickup diagram. I've searched on all of the common guitar wiring diagram sites and several forums, to little avail. I am converting an SSS stratocaster to HH. I would like to keep the three stratocaster pots, having a master volume, tone for the neck pickup, and tone for the bridge pickup. The pickup combinations I'm looking to wire are as follows:
I think we all pretty much know what this is, but as I have one sitting here, I thought I'd take a few shots.
Outside.JPG
Outside is actually a really nice gold finish. Not at all cream, the way it looks on the website
Switch.JPG
I've seen this somewhere before... Not great soldering on the wires. I might have to beef that up.
Inside1.JPG
Underside Shot
Inside2.JPG
All of the pots that control EQ are 100Kb. I'll get some better pictures up once I get home.
Hi guys... my Blackmor-ish sound search continues... After the TP-1011 preamp, now is the time of MTC, a circuit built by the guitar tech of Ritchie:
This circuit seems to be a LCR filter which helps to obtain the famous shaped RB sound... according to Dawk's site it smoothes up the sound a lot, it's some kind of subtle but still very noticeable. Your sound also gets crystal clear! With the MTC your tone pots stat to work like wah wahs, turn them to zero and it sounds like a closed wah but...
Happy New Year to all the good folks here at freestompboxes.org.
Here is a new design that I have been working on over the last few years - a pedal designed to mimic the performance of a typical negative feedback tube amp power stage driving a Celestion quad box or similar.
The pedal has the negative feedback presence and depth (resonance) controls typical of Soldano, Marshall, Fender, Peavey etc.
Tube power amplifiers have a high output impedance compared to solid state class AB and digital...
I have a green box MXR 118 Analogue delay that i have brought back from the dead and am trying to align but cannot find the alignment procedures for clock frequency and location of trim pots anywhere...
It is the SAD1024 version with 118-3001 102 board.
I have found a couple of alignment sheets on here but they are for the PT2399 modded version and refer to trim at point A with no reference to what point A is.
I recently built a Boss CE1 clone with all original transistor types except for one sub which is the KSA992 for the 2sa493. I used the UA726 TA7136 to TL071 adapters with TL071s installed. 1458 for the the LFO and the DIY synth MN3002 to TDA1022 adapter board. The rate LED works in both vibrato and chorus mode. The Peak LED works properly. High low switch works properly, but I only get a clean guitar signal in bypass and effect mode. I get very little guitar signal when I use the stereo output...
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