Dawner Prince Red Rox

Minotaur Sonic Terrors Fuzz & Burn

 MTK traced this pedal and sent gutshots and component values to AlexS who sent them to me to make a schematic and a proper layout with all components on the board. Still, there is some offboard wiring to do since it is two circuits in one enclosure.

So what is it? Essentially an Electra Distortion going into a Meathead with an input/output selector switch.

 Once again, thanks to MTK for tracing this!

Ampeg vh140c Channel A Pre Amp

 This one was quite a mess to get right since some of the schematics online was missing parts and/or had the wrong values. After some head scratching I worked from the factory schematic of the actual amp. 

However, did some mods without changing the charcter of the sound to much. First 9v/-9v operation is used simply because there wasn't a big difference in sound compared to stock 15v/-15v, maybe a bit less headroom (I have added a 15v version of it at bottom of this post but it is not verified).

Added some power filtering and changed a non polarized cap to standard electrolyctic (3,3uF) and changed gain pot to audio taper for better sweep.

Stock units had three 4558 op amps but to my ears TL072's perform much better. Also a buffer up front is mandotory because this thing will squeal with controls dimed.

First up schematic:

Verified 9v/-9v version

15v/-15v version which is using a the more robust LT1054 charge pump.

Thorpy Fx Fallout Cloud

 One of the more interesting Big Muff derivates out there. The first three stages is a basically a Dice Works Muff Diver which itself is based on a 1972 era Triangle Big Muff. The tonestack is whats make it standout from the crowd; an active transistor based two band eq.

And demo of MTK's build

1776 Effects Multiplex Jr.

 Schematic and info HERE .

Original calls for a VTL5C3 vactrol but since they are obsolete and stupidly expensive the layout calls for a home made vactrol. Just socket the LED and LDR to find the right combo.

JHS Charlie Brown V4

 

MI Audio Super Crunch Box V2

Seppuku Fx Mind Warp

Schematic, trace and info avaiable at FSB. Note that there is a cap value missing across pin 11 and 12 at the PT2399. There is a 10nF cap across pin 9 and 10 so a close value to that should work. Also, lug pot numberings isn't marked on iether of the schematics so lug numbering in the layout is just a best guess. Both red and green diffused LEDs has been used in the original circuit so a socket for would be a good idea as well as for the LDR.

*Edit 200809*

Dragao verified it using 820/8 LDR and green diffused LED. He also verified the Warp pot lug connections.

 

 

Fairfield Circuitry Unpleasant Surprise

Moosapotamus Brass Blender

Schematic and info HERE

 

Moosapotamus Acoustic 360 Bass Fuzz

Schematic and info HERE

 

Smallsound/Bigsound Team Awesome Fuzz Machine V1

Fuzzhead Fx Box of Germanium Mk. II

An updated version of a project I was tinkering with a couple of years ago. The idea was basically to find some use for some low leak USSR germaniums other than in Fuzz faces, Rangemasters and Tonebenders, And to do a germanium version of Zvex Box of Rock. Some biasing tweaks was necessary since BJT Ge's is a completely different animal to MOSFETs but the cap values in the signal path is more or less identical. Couldn't resist to add Boost switch so you can use it as a fuzz as well...and decrease the value of the low pass filter cap in the tonestack to 12nF since I found it a bit muddy with 22nF.

First version was positive ground but I used normal power supply for this version since I have to many unused MP38A transistors but other fairly low gain and low leak NPN germaniums should work as well.

 

Infanem Driving Notion

Schematic and info avaiable at Deadend Fx

**Edit 220421* Deadend Fx recently traced this circuit and it turns out that the initial traace and schematic posted at Ilovefuzz forum had some bugs. Layout below is based on the most recent trace. Notice that it is highly recommended to so socket Q6 and Q7 since you'll likely need to go through a bunch of transistors to make the fuzz section operate properly. See voltages in the build doc above.

DAM GT-73 Graveyard Tramp

A cool sounding Fuzz Face derivate. Note that the value of the volume potentiometer is unknown but we found out that 250k or 500k sounding good. Also, the fuzz control is wired backwards per original but if you want a normal counter clcokwise control, just swap 1 and 3 lugs and use a 1kC pot. OC82D transistor might be a bit hard to come by so try others that suits your taste.

 

God City Instruments Uno Fuzz

There is two layouts of this one, one stock with one control. Since it begs for modifications I added a second layout with four pots for more control:

• 100K resistor at the output is replaced with a 100k volume control.

• 33k/68k before Q2 is part of a fixed Big Muff style tonestack so they are replaced by a tone control.

• The tonestack itself has a very deep and quite narrow mid scoop so a Shape pot is added to blend in some more mids via 27nF cap. 

Stock layout 

 

...and four knob layout.

God City Instruments Socialist Jr

God City Instruments Not Okay

Catalinbread Formula No. 55

Spaceman Effects Atlas III Booster

Schematic and info HERE