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.

Cornish TB-83 Treble Booster

 

VFE Dragon

 Here is a pretty cool overdrive with qquite a poweful eq section. However, it requires som fiddling to make your own custom 10kC/100kC dual gang pots for the EQ controls. HERE is a small tutorial at page 3. Second, the DPDT on/on/on switch type isn't specified in the info sheet I have, only "the coomon type" which leads me to believe it is a "Type 2" switch.

Note that this a buffered bypass circuit.

 

 

 

Guyatone PS-025 Touch Overdrive

 Schematic and trimpot setup is avaiable at Deadend Fx.

Guyatone PS-021 Guitar Exciter & Compressor

 Schematic is avaiable HERE.

Guyatone PS-020 Bass Exciter & Limiter

 Schematic is avaiable HERE.

Rocktek Metal Worker

 A "bottom of the well" HM2 variant. Differs enough to warrant its own layout, though...

 

 

 

Rocktek ODR-1 Overdrve

 Schematic is avaiable HERE.

ProCo Brat / Roadkill

 Schematic is avaiable HERE.

 

Aria AOD-1 Overdrive

 Schematic is avaiable HERE.

21th Century Big Muff

 A pretty cool lookin¨take on the ol¨Big Muff. The first and the last stage is replaced by a dual op amp, a diode lift switch at the the first clipping stage, a Gain control that biases both of the clipping stages and for the tonestack, a James control network is used for invidual bass and treble controls. .

Schematic is avaiable HERE.