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TABLE OF CONTENTS

1 Project Overview

2 Introduction & Usage

3-4 Parts List

5 Build Notes

6 Schematic

INTRODUCTION

The Cerulean Amp Overdrive is an updated version of the Marshall Bluesbreaker pedal. The

Bluesbreaker is the source circuit for a number of expensive boutique pedals including the Analogman

King of Tone (which is two Bluesbreakers in the same box with a few modifications).

The Cerulean project has integrated two of the modifications from the King of Tone: the Presence

control (an internal trimmer) and the ability to control both the soft clipping (stock) and hard clipping

diodes. The clipping switches have been expanded further to allow two different diode combinations for

both hard and soft clipping, whereas the King of Tone only has "on" and "off" settings for each.

Another notable clone of the Bluesbreaker is the JHS Morning Glory, which added a JFET gain stage at

the end for increased output volume. The Cerulean project provides the option of using the output stage

of the Morning Glory. See the build notes for more information.

During the development of this updated version of the Cerulean, it was determined that the "Bright"

switch of the Morning Glory was not very useful, especially when there was already a Tone control and

an internal Presence control, both of which affect the high end. The original Bluesbreaker doesn't filter

out any of the treble in the clipping stage, so in fact the Morning Glory is really no brighter than a stock

Bluesbreaker, and instead only adds the option to get darker. Accordingly, this option has been removed

in favor of simplifying the decisionmaking process when deciding how to build it.

However, if you do want to make an exact clone of the Morning Glory including the Bright switch, you

can use the earlier version of the Cerulean which will continue to be available for the foreseeable future.

USAGE

The Bluesbreaker has the same control layout as most overdrive or distortion effects:

• Tone controls the treble response of the effect.

• Drive controls the amount of gain in the op-amp feedback diode clipping stage.

• Volume controls the overall output.

• An internal Presence control allows you to tweak the overall response of the tone knob.

• Soft Clipping lets you choose between stock clipping diodes, LEDs, or no soft clipping.

• Hard Clipping lets you select high-threshold hard clipping, low-threshold hard clipping, or none.

CERULEAN AMP OVERDRIVE

7 Drill Template

8 Enclosure Layout

9 Wiring Diagram

10 Licensing

10 Document Revisions