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.

 

 

 

Tesla AYZ-033 Overdrive

 Slightly modified. Stock units had two 741 op amps but the layout is modified for a dual op amp. A 1458 will do the same job as two 741s.

 

 

 

Yamaha NE-1

 Schematic is avaiable HERE.

Electro Harmonix Attack Equalizer / Knockout EQ

 Found this in an older folthe usuader that I forgot. Includes some necesarry modernazations like true bypass, onbard charge pump, input and output caps and pulldown resistors.

Schematics is avaiable HERE.

J Rockett Boing Reverb

 Schematic is avaiable HERE.

Electro Harmonix Bassballs / PedalPCB Lowballer Twin Envelepoe Filter

 It s time for a guest appearance!

Chris Stelloh of Capitalist Death Cult requested a layout for this one a while ago but I couldn't do it at the time so he went off and did his own. The layout is verified and good to go.

It is basically a EHX Bassbals with quite a few mods by PedalPCB. The internal trimpots are now extrenal pots. The Attack, Decay and the the distortion section are addons that wasn't included in the original Bassballs.

Caroline Guitar Company Wave Canon Mk.1

 A small break from the break...

 

 

 

 

And a short demo by Orion Tonehunt. 

 

 

Boss SG-1 Slow Gear

 Schematic is avaiable HERE.

 

 

 

EHX Muff Fuzz - Op amp version

 The last layout for a while, I honesly don't know when the next one will be uploaded, probably in january. There is three eye surgeries on the horizon...

Anyway, I had athe change to trace an old EHX Muff Fuzz of the op amp variety a few weeks ago. As you know, EHX used parts whatever they had on hand in the 70s so there is lots of different schematics online so I have included several options for some of the values.

My unit had a 1458 op amp, silicon diodes, 47nF for C1 and 100k for R7.

ProCo Fat Rat

 Pretty much a stock Rat with two additional switches. The clipping switch selects between the stock silicons and a assymetric MOSFET/Shottky pair. A Earlier units is supposed to have a 1N270 germanium diode in place of the Shottky  The Fat switch toggles between stock mode and Fat mode by adding a 6,8uF cap at one of the RC filters and a cap to ground at the gate of the output buffer.

 

 

....and a demo by MR. Ian Sheridan.

 

 

Gretsch Expandafuzz

 Here is an old forgotten old cat...

It is basically a Controfuzz followed by three seperate channels for the Treble, Bass and Mid controls. The fuzz can be bypassed so it can serve as an EQ pedal only as well.

Some improvements had to be done to make it more practical. 

1. An onboard voltage inverter is added for the required bipolar power supply.

2. Bypass switching.

3. A Master volume control at the output.

4. The ancient 14 pin uA748 single op amps is replaced with dual channel op amps. 1458 op amps has the closest spec to the original but it is worth experimenting with higher fidelity op amps for the EQ section and the summing amp (IC2 and IC3).

 

 

Beetronics WhoctaHell

 Schematic is avaiable HERE.

Pro Analog Devices Manticore V2

 Schematic is avaiable HERE.

 

Walrus Audio Contraband Fuzz

 Schematic is avaiable HERE.

Walrus Audio Mayflower

 Schematic is avaiable HERE.

Nobels PRE-1 Preamp Booster

 Schematic is avaiable HERE.

Paul Cochrane Tim

 The father of all the Timmys...

Schematic is avaiable HERE.

GuitarPCB 69 Stones Drive 2022

 ...and a another request!

Schematic is avaiable HERE.

Crowther Hot Cake 1977 version

 Per request.

Schematic is avaiable HERE.

Fjord Fuzz Freia

 A BIG thank you to Chris of Capitalist Death Cult for digging this one up!. And also a big thank you to Daniel of Fjord Fuzz for sharing the information how to build a clone.

So, what is it, then? It is basically the preamp section of the mighty Shin Ei/Honey Univibe. Some minor changes has been made so it can be used both as a preamp and a great sounding fuzz when the Bias and Gain is turnned clockwise. 

Most medium gain NPN silicon transistors should work fine but they might give different character since it is quite a small circuit. So socketing is recommended.