Volcano Device

Project overview

The perfect fuzz! According to the people from EQD at Akron, Ohio. This circuit has been designed to have the ultimate classic fuzz tone with a big low end, a biting top end without being too harsh. Inspired on the classic fuzz face featuring an input buffer and a pickup emulator (transformer).

For this project, we have included an internal volume trimpot as well as an additional Bias to have more control on the main Bias control outside the box.

Introduction

The Volcano device is a little one-knob wonder inspired on EQD Erupter, with roots on the all-time classic Fuzz Face.

The people from EQD had a pretty interesting approach on the conception of this fuzz; first of all, their idea of having one single Bias knob, leaving the standard ‘Fuzz’ and ‘Volume’ as it was cranked at 11 as most guitar players like to use, but having the chance to dial it at taste by controlling how much voltage you are feeding into the transistors by the Bias knob.

Another interesting thing about this pedal is the first section, the buffer, and the pickup simulator. The goal of this is to make this circuit ‘Pedal board friendly’, especially with wahs.

On this circuit, we have included two internal trimpots; one acts as a volume to set up the max output you’d like to get out of this box, the other one, ‘Bias+’, allows you to do some fine-tuning on the behavior of the main bias knob.

Controls

• Bias

For further analysis on this circuit take a look at this thread on Free Stomp Boxes Forum.

For any technical questions regarding this build don’t forget to check out our Facebook Group and our forum at Free Stomp Boxes.

Volcano Device 1.1v – Building Docs

Volcano Device 1.0v – Building Docs

Volcano device – Drilling Template