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...
Kamadude1216 and I traced this over at the PedalPCB forum , but figured we'd share it here, too. So, bottom line upfront, here's the schematic:
With that said, let's start off with the gutshot (behind the spoiler).
As you can see, it's built on copperless perfboard with lots of offboard wiring. Everything is gooped with a soft black rubber that was easily removed.
Here's what's underneath the rubber once it's removed:
Unsurprisingly, it's quite similar to the Paul Trombetta...
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.
Crazy this doesn't seem to have been traced before.
I was compelled to trace this unit as the only available schematic (a factory one at that) didn't match what I had infront of me.
Noticed differences between factory schematic and my trace:
•There's numerous resistor value differences
•A whole output buffer added
•No resistor between ground and the + input on the final all-pass stage.
•The colour switch and blend labelled the right way.
•No input 'pulldown' resistor.
Does anybody have the schematics of the EBS Multidrive perhaps or else some information about the signal switching?
I'm actually not so much interested in the internals workings of the drive but more the switching arrangement and input/output stages because it pops when enabling it.
The foot-switch seems not to be true bypass but a simple one pole switch. This probably implies that the switching is done electronically and that the foot-switch provides a logical 1 or 0 to the electronic...
You asked for it and here it is :wink:
The Vox AC30 Top Boost amplifier including driver and output stage in a convenient 9v dc overdrive pedal format :lol:
There are three places in the AC30 where clipping occurs at different signal levels - with input gain and tone controls on maximum reasonably symmetrical occurs first on the output stage at approximately 1.3mV 1kHz sine wave signal input level. At 2.8mV signal input the driver stage goes into asymmetrical clip at first and eventually...
I recently bought a Surfybear Compact and after I put it on my board I had an interesting issue. The Surfybear Compact has a decay dial but it didn't work when on the board. It would always be maxed out.
After some testing the culprit was found. It was the J. Rockett Archer Ikon. After contacting Surfybear someone there explained how the decay circuit works and that loud signals could mess it up. A short search on the net showed me that other people had issues with the Archer messing up...
Usually suprised at the quality of their pedals. I have their v3 ep or bp comp, black one, and it’s pretty good. I’ve attached a pic of the version before mine as the last pic. I’d have to take mine apart and haven’t felt like it. Actually the comp is first. Have no clue what the goop is covering. It’s optical. Supposed to have an EP style boost.
This huge box is a preamp to run any instrument into several types of Leslie speakers. It's got four different Leslie speaker outputs that can be used individually or in combination, unlike Leslie's own combo preamps that only have a single output. High/low level inputs, volume and tone controls and two footswitches: Slow/fast rotation and power on/off.
The unit that I traced has been modded with two extra outputs on Speakon-8 connectors and a custom speed control unit. Two resistors are...
For component values I cannot make confirmations as all is on quick notes and some scans made over a year ago. As for the schematic I could check and re-check for possible errors. However, whatever I will do, AG will pick out a few more. Let's say I'm lazy and will just wait :lol:
I’ve always liked phasers, in fact one of my first pedals I’ve ever built was a Phase 45 clone. Not only I liked how it sounded, another main reason for choosing it (other than the complexity) was that I only needed two matched JFETs instead of, for example, four for a four-stage phaser.
I’ve been sitting there, content with my box, for some years, until recently I’ve heard of the Project 447 phaser on an old ETI magazine. It wasn’t perfect by most accounts (the long string of 741 op-amps in...
Anybody have a schematic for the Digitech PDS 8000? I have one that produces no effect and the infinite loop is locked on. I will at times get a digital squeal when the effect is engaged (and the infinite loop is too obviously) until I go back to bypass.