Thorpy Fx Peacekeeper Overdrive

 Schematic is avaiable HERE.

Thorpy Fx Gunshot Overdrive

 A slightly modified Tubescreamer with the input buffer replaced by a  SHO MOSFET booster.  The Calibre control can be noisy but I guess "Crackle is OK"....

Schematic is avaiable HERE.

Dunwich Amplification Modified HM2 - "Left Hand Path" version

 Traced by AlexS and Fuzzhead, this is a quite tweakable and heavily modified HM2 variant with more gain on tap, more volume, two on/off/on diode switches and a very flexible four band eq. 

It is a quite noisy beast when Gain and all eq controls is maxed out though but a buffer up front helps a lot. Or you can increase 1K resistor connecting to Gain 3 to calms things down. Stock HM2 value is 47k so there is a pretty wide margin to experiment within.

Layout is verified.

 

 

 

 

 

Electro Harmonix V2 Big Muff Ram's Head "White Can version" 1974

 It is Pie Day so here is a layout of an old Ram's Head variant. Rarely cloned and some cap values is not found in any of the other vintage EHX variants. 220pF/680pF caps replaces the standard 470pF/500pF values and the tonestack has less mid scoop. Still added a Mid switch for some sligtly boosted mids.

 Note that the FS36999 was house numbered 2N5133s. These varied in Hfe a lot, ranging between 100-800. So socketing may be a wise decision for the transistors.

 

 

...and a mojo layout with 1,2w carbon comp resistors for the purist...

 

MXR El Grande Bass Fuzz

 Per request. Note that there is an option to choose between internal trim pot (as in original) or external potoentiometer for the Freq control. Freq switch is external and the MPQ3904 transistor array is replaced with ordinary 2N3904s.

Schematic is avaiable HERE. 

 

 

 

XTS Atomic Overdrive

 An interesting high gain overdrive three cascaded mu amp stages with a poweful and flexible eq section 

Schematic is avaiable HERE.

Came out a bit big with eight transistors and an IC so mounted sideways in a BB enclosure might be the best option when housing it...

Dunwich Amplification Hybrid Cthulhu - 3 knob version

 Another Dunwich trace by evilarsen, AlexS and fuzzhead.

I believe this one was made on custom order and/or was a on/off product. However, compoent values varied over time but we added some notes at the bottom of the layout and schematic for the most significant changes that is worth experimenting with:

Input capacitors connecting to the input cap blend control (Depth) varied quite a bit. I ended up with a 15nF for C2 and an 1uF for C1 with a 100kC Depth control. 

The other thing is one of the clipping diodes at Q4. Most units had a germanium diode but a few had a silicon transistor in TO-18 casing wired as a diode. Both layouts bellow have slots for both components but remember to use one of them, NOT both.

Two layouts, one normal and one with 1.5W carbon comp resistors. Both is verified.

 

 

 

 

 

Dunwich Amplification Modified HM2 - DIY version

 Dunwich released a small run of DIY PCBs a few years ago of a modified HM2. There is a few changes from a stock HM2 most noticable the on/off switches for both soft clipping and hard clipping diodes. You may want to experiment with the cap values at one of the gyrators for a more effective separate Mid control. AMZ and Griffin Effects have very useful bandpass filter/gyrator calculators. 

Arion SMM-1 Metal Master

 Some says this is a HM2 killer. I don't know about that but it differs  enough circuit wise to deserve its own layout. Note that "Hard/Soft" switch is omitted as well as "Output 2" op amp circuit.

 

 

 

 

 

Factory schematic is a mess so I had to draw up a cleaner version. Electronic switching, buffered bypass and "Hard/Soft" switch is not included.

Ibanez SM9 Super Metal

 Schematic is avaiable HERE

Dunwich Amplification Fuzz Throne

 There is several versions of this one but the 4-knob version seem to be the most common version. 

Initially, it was a custom fuzz for doom band Conan but it was later slightly modified and morphed into Dunwich/Magic Pedals lineup of pedals. Traced by evilarsen and fuzzhead who both dig the sounds coming out of this doom circuit...

 

 

 

 

 

 

...and here is what evilrsens build looks like.

 

 

 

 

 

 

Colorsound Hybrid Tonebender 2018 Edition

Couldn't resist to draw a schematic and a layout for this interesting mutant of a circuit that just got traced. 

 First two gain stages is almost identical to a Jumbo Tonebender (except for one cap and one resistor value), the third gain stage is almost identical to the saturation stage in a Tonebender Mk. 3. Transistor bias is quite different with the zener diode, though. Tonestack is Big Muff style followed by a Volume control.

Note that earlier versions had 100nF or 470nF instead of 10nF so it might be worth socketing that cap.

 

 

 

 

 

Catalinbread Karma Suture Silicon

...and silicon version.

Catalinbread Karma Suture Germanium

 Taking a break from the break since this one was too interesting to pass on and it was a quick layout.

Tracing post, schematic and info at Aion Fx.

Lastgasp Art Laboratories Tone Mosaique

 900 post. Phew. I think it is time for a couple of weeks break do deal with "outside world" issues.:-o. Will still log in here now and then and eventually upload something if something really interesting shows up.

But here is a cool design from Lastgasp Art traced by Deadend FX, a bitcrucher/tremolo,/ringmod/envelope follower...thing.  Schematic is avaiable HERE.

Dunwich Amplification Cthulhu Fuzz - 1 knob silicon version

 Time for some doom. Recently traced by evilarsen and an odd fella who likes fuzz. Layout is verified.

 

 

 

 

Seppuku Fx Sub Octave Synth

 Schematic is avaiable  HERE.

Modern SLO 100

 Russian pre amp emulator of a Soldano SLO. D1 and D2 is optional since they only add some compression to the overall sound.

 

 

 

 

 

Lastgap Art Laboratories Misty Cave

 A biggie but it will fit a BB enclosure without battery. If you think this is to big for vero, Deadend Fx have excellent PCBs for this circuit and many other cool designs.

Schematic is avaiable HERE.

Park Auto Wah

 Not an auto wah in a normal sense, more like an inductorless wah circuit driven by an LFO.

This must be one of the earliest modulation pedals and IMO it is a hidden gem. Lots of murky psychedelic madness can be found in this circuit, especially with a dirt box upfront. 

Rate and Depth controls is self explanatory but the Tone control really widens the ranges of tones. Clockwise you'll get normal wah wah sweeps, roll it back and you can dial in vowel and yuo-yuo sweeps. 

With the Depth control CCW, the LFO is disengaged and the unit acts as a eq / filter circuit.

Layout has some mods; power supply mod since original units was positive ground, CBE pinout for the transistors, power filer cap and protection diiode. As for the transistors, most low gain NPN silicons should work, I ended up with PN2222s in the 150Hfe ballpark. 

This is soon to be boxed but need to figure out how to add a rate LED first...

*Edit* Rate LED added with help from Radu.  Thanks!

Schematic is avaiable HERE