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1 Project Overview

2 Introduction & Usage

INTRODUCTION

The Zircon Silicon Fuzz is a version of the "Hot Silicon" community project, itself an adaptation of the

Sola Sound Tone Bender for silicon transistors.

The history of this circuit is a bit suspect, with two people claiming originality. It dates to 2003 at the

very latest when Doug Hammond posted a schematic for a circuit he called the Hot Silicon, which was a

hybrid of two earlier circuits from Gus Smalley and Aron Nelson.

However, an almost identical circuit was posted by Mictester in 2009 on freestompboxes.org, and he

claimed he first developed it in the 1970s when he was trying to make a friend's silicon Tone Bender

from Macari's (Sola Sound) sound good, and then tweaked the circuit over the following decades until

arriving at the finalized version in 1994. (Sola Sound did make a very small number of Tone Bender Mk

III's with silicon transistors-these are different than the Jumbo Tone Bender which was basically a Big

Muff clone.)

Maybe it was just parallel development that arrived at the same outcome. Regardless of true origin,

though, the Hot Silicon (or Silicon Tone Bender) is a fantastic circuit that has endured as a classic in the

DIY scene for many years.

The Zircon is a near-direct adaptation of the Hot Silicon circuit, with one change: the input capacitor

switch (called "Fat" in the original schematic) has been changed to a potentiometer so it can be gradually

blended in or out rather than being either full-on or full-off.

USAGE

The Zircon has the following controls:

• Body blends between two input capacitors. Note that this may be seen as working backwards, with

more bass on the low end that is gradually removed for a treble emphasis on the high end.

• Gain controls the amount of gain in the transistor fuzz stage.

• Tone is a Big Muff-style balance control that pans between a low-pass filter (bass emphasis) and a

high-pass filter (treble emphasis).

• Volume is the overall output level.

ZIRCON SILICON FUZZ

10 Licensing

TABLE OF CONTENTS