Ace Tone WM-1 Wah Master

 

 

 

Shin-ei 6TR. Fuzz Wah

 An old request. For those who are obsessed with the early William Reid tone...

Foxx Wah Inductorless

 Foxx sold a couple of wah variants in the early 70s, often combined with a Foxx Tone Machine circuit. There was an inductorless version and a Cry Baby variant with a 4 posistion "Wah Tone" selector switch. This layout is for the inductorless version. HERE is the schematic.

Colorsound Vocalizer

 A rare bird in the Colorsound range. Some additional mods can be made. Replace the 3,9k resistor with a 10k pot for a Freq control. And try a PNP Germanium for Q1 which smoothens the feel of the formant filter..

Schematic is avaiable HERE.

Spektr 2 Fuzz Wah

 

 

 

Daredevil Pedals Atomic Cock

 Schematic is avaiable at PedalPCB forum.

 

Ltava Fuzz Wah - modified

 The fuzz and wah section of Ltava Fuzz/Vibrato/Wah multi effects pedal manufactured in Ukraine in the early 80s. The LFO section was left out simply because the layout would be too big. The internal trimpots is taken out on the outside for external gain controls. And a onboard voltage inverter was added.

 

Schematic:

 

 

Tesla AYZ-025 Fuzz Wah

 There is a layout for the fuzz section in library but here comes the whole package with the inductorless wah circuit ryincluded. The wah pot can be wired as a manual panel mounted "bandpass filter" tone control or wired through an expression jack. The fuzz section is based on Foxx tone machine but there is quite a lots of changes along the signal path wiith different component values, a couple of buffer stages and negative feedback resistors. However, the Tone control match the FTM so feel free to adjust the 3,3nf cap for a higher value to bring up some mids.

 

 

 

Korg FK-2 Mr. Multi

 Another weird one! A rotary selector selects between a four stage phaser, wah and phaser and wah combined. The latter mode is supposed to be something out of this world. Deadend Fx (who else) have a projects for this beast and as usual, don't hesitate to support these guys by bying some nifty PCBs. They also included some useful mods such a Depth control for the LFO and two trimpots to fine tune the LFO and the sweep of the wah pot. Build docs, schematic and setup guide HERE.

And HERE is the stock schematic.

 

Keio Synthesizer Traveler F-1

 An old, obscure, weird fuzz/wah/filter/noise/volume pedal from Japan dated from the the early 70s. Schematics and more info HERE. Note that a couple of resistor values was is incorrect in the original schematic but it has been corrected for the layout below.

Shin-ei ME-7 Wah-Hurricane-Siren-Surf-Volume

 This was a request. It is an old multieffect that includes wah, two noise generator settings, a volume pedal setting and a "Siren" switch which is an oscillator. 

 

 

 

 

Royal CW-1 Cosmo Wah Machine

 Now this is some crazy stuff! How about a wah / ringmodulator with vibrato tails???

The schematic is avaiable at DeadEnd Fx.

Note that the Wah/Cosmo Select switch is the stock 2P6T rotary for this layout.

 

 

Royal RP-2 Fuzz Wah Machine

 Another old japanese obscurity. There is a hand drawn factory schematic floating on the web but I decided to clean it up in order to build a clone. It looked like slimmed down Ibanez Standard Fuzz with a tone control. and a  "Howl Adjust" control which dials in the upper octave.

And built the fuzz section only...and it wasn't any good...at all. Lacking in gain, output volume and the tone control was useless. So I had to mod it without tinkering too much Added a "gain cap" across the source of the input FET transistor and ground and subbed the ge diodes for silicon. For the tonestack I simply moved the 3,9nF cap from bass side to the treble side and the 33nF from treble side to the bass side. It now behaves like the tonestack in Foxx Tone Machine but it is not as scooped. Volume control was increased to 250k and the 2SK30 input FET was just not cutting it so I replaced it with a 2SK117 for much more gain on tap.

Much better! But still not as good as a regular Superfuzz or Standard Fuzz IMHO. But it was fun to tinker and "improve"old forgotten stuff.:-)

Fuzz section with suggested mods.

 

 

Wah section

 

 

 

Schematic

 

 

 

Royal RC-1 Effect Machine

 The Royal line of effects was made in Tokyo, Japan in the early 70s by Thunder Electronics. Not much is known about the company but they had some own designs in their portifolio along with the casual Shin Ei superfuzz clone.

Royal RC-1 Effect Machine was an inductorless wah which topology was based on fuzz face and a twin notch filter. It is not the most powerful or vocal wah but it does a decent job after a superfuzz just like in Royal RFC-1 Double Effect Machine.

 The layout and schematic is verified.

 

Shin-ei Companion WT-1 Wah Wah

 Here is one for the Psychocandy fans. Just put this after your superfuzz clone (or to be more accurate, your "6TR" superfuzz clone) and go to town. The stock transformer part number is unknown but a 42TM013 will do with its 500mH inductance. Both 50k and 100k wah pots were used and input cap were iether 50nF or 10uF.

Schematic avaiable at Tonehome.

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

 

 

 

Marshall Supa Wah

 Schematic is avaiable HERE.

Roland AD-50 Double Beat Wah section

 This was a request. Primary intended for the fuzz section but could of course be used as a stand alone unit.

Gyrator Wah Wah

Been fashinated by gyrator tonestacks for a while and when I saw this wah circuit by Olivier Jambois I had to give it a go. Sounds very good and powerful and it is loud! Schematic, a nice writeup and soundclips HERE.

Works equally well as a standalone bandpass filter pedal but I recommend to change Wah pot to linear taper since most of the action is at the end of the rotation.

Tycho Brahe Parapedal