Aion CRESCENT AMP DISTORTION Manual de usuario

CRESCENT AMP DISTORTION 1

PROJECT NAME

CRESCENT

BASED ON

EFFECT TYPE

PROJECT SUMMARY

DOCUMENT VERSION

MI Audio Crunch Box

A Marshall-like distortion pedal noted for its high-gain “stack of amps” tone.

Amp-Like Distortion 1.0.1 (2021-04-12)

BUILD DIFFICULTY

Intermediate

Actual size is 2.3” x 1.86” (main board) and 1.78” x 0.86” (bypass board).

CRESCENT AMP DISTORTION 2

TABLE OF CONTENTS

1Project Overview 7Enclosure Layout

2Introduction & Usage 8Wiring Diagram

3-4 Parts List 9Licensing

5Schematic 9Document Revisions

6Drill Template

INTRODUCTION

The Crescent Amp Distortion is an adaptation of the MI Audio Crunch Box, a tweaked hybrid of the

Marshall Guv’nor and Bluesbreaker first released in 2006.

It’s solidly in the family of Marshall-like pedals and is lauded for its high-gain “stack of amps” tone. It

has seen has seen at least five major versions since that time, with the fourth and fifth version being

renamed to the Super Crunch Box.

The Crescent is not a direct clone or copy of any of these versions, but rather a hybrid of several of them.

It’s most similar to version 3, but with an added option for 18V operation using a charge pump as well

as a clipping diode toggle switch (both features from V5, although our version had it long before V5 was

released!).

The updated version of the Crescent is mostly the same as the earlier 1590B version, with two major

changes. First, there is an internal slide switch allowing 9V or 18V operation to be selected. Second, the

Presence control has been relocated back inside the enclosure as a trimmer, as on the original Crunch

Box units. The presence control essentially just sets the range of the main tone control, so it doesn’t

need to be external.

The Crunch Box was the inspiration for another well-known high gain pedal, the Suhr Riot. An Aion FX

adaptation of the Riot is available called the Fusion Distortion.

USAGE

The Crescent has the following controls:

• 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.

• Clipping (toggle switch) selects between 3 sets of diodes: 1x silicon, 2x silicon, or LEDs (stock). This

will directly affect the volume, which will need to be adjusted when changing this mode.

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

• Voltage (internal slide switch) selects 9V or 18V operation.

CRESCENT AMP DISTORTION 3

PARTS LIST

This parts list is also available in a spreadsheet format which can be imported directly into Mouser for

easy parts ordering. Mouser doesn’t carry all the parts (most notably potentiometers) so the second tab

lists all the non-Mouser parts as well as sources for each.

View parts list spreadsheet →

PART VALUE TYPE NOTES

R1 1k Metal film resistor, 1/4W

R2 1M Metal film resistor, 1/4W

R3 1k Metal film resistor, 1/4W

R4 10k Metal film resistor, 1/4W

R5 1M Metal film resistor, 1/4W

R6 470R Metal film resistor, 1/4W

R7 1M Metal film resistor, 1/4W

R8 22k Metal film resistor, 1/4W

R9 22k Metal film resistor, 1/4W

RPD 2M2 Metal film resistor, 1/4W Input pulldown resistor.

LEDR 4k7 Metal film resistor, 1/4W LED current-limiting resistor. Adjust value to change LED brightness.

C1 22n Film capacitor, 7.2 x 2.5mm

C2 1n Film capacitor, 7.2 x 2.5mm

C3 100pF MLCC capacitor, NP0/C0G

C4 220n Film capacitor, 7.2 x 2.5mm

C5 100n Film capacitor, 7.2 x 2.5mm

C6 100pF MLCC capacitor, NP0/C0G

C7 1uF Film capacitor, 7.2 x 3.5mm

C8 22n Film capacitor, 7.2 x 2.5mm

C9 22n Film capacitor, 7.2 x 2.5mm

C10 10uF Electrolytic capacitor, 5mm Charge pump filter capacitor.

C11 470n MLCC capacitor, X7R Charge pump filter capacitor.

C12 470n MLCC capacitor, X7R Charge pump filter capacitor.

C13 10uF Electrolytic capacitor, 5mm Power supply filter capacitor.

C14 47uF Electrolytic capacitor, 5mm Reference voltage filter capacitor.

C15 100uF Electrolytic capacitor, 6.3mm Power supply filter capacitor.

C16 100n MLCC capacitor, X7R Power supply filter capacitor.

D1 1N5817 Schottky diode, DO-41

D2 1N914 Fast-switching diode, DO-35

D3 1N914 Fast-switching diode, DO-35

CRESCENT AMP DISTORTION 4

PARTS LIST, CONT.

PART VALUE TYPE NOTES

D4 1N914 Fast-switching diode, DO-35

D5 1N914 Fast-switching diode, DO-35

D6 1N914 Fast-switching diode, DO-35

D7 1N914 Fast-switching diode, DO-35

D8 5mm LED, 5mm, red diffused Can also use 3mm LEDs.

D9 5mm LED, 5mm, red diffused Can also use 3mm LEDs.

D10 1N5817 Schottky diode, DO-41

D11 1N5817 Schottky diode, DO-41

IC1 TL072P Operational amplifier, DIP-8

IC1-S DIP-8 socket IC socket, DIP-8

IC2 TC1044SCPA Charge pump, DIP-8

IC2-S DIP-8 socket IC socket, DIP-8

DRIVE 100kB 16mm right-angle PCB mount pot

TONE 10kC 16mm right-angle PCB mount pot

VOL. 100kB 16mm right-angle PCB mount pot

CLIP SPDT cntr off Toggle switch, SPDT on-off-on

PRES. 25k trimmer Trimmer, 10%, 1/4” Bourns 3362P or similar.

VOLT. SPDT slide Slide switch, SPDT E-Switch EG1271

LED 5mm LED, 5mm, red diffused

IN 1/4" stereo 1/4" phone jack, closed frame Switchcraft 112BX or equivalent.

OUT 1/4" mono 1/4" phone jack, closed frame Switchcraft 111X or equivalent.

DC 2.1mm DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent.

BATT Battery snap 9V battery snap Optional. Use the soft plastic type—the hard-shell type will not fit.

FSW 3PDT Stomp switch, 3PDT

ENC 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1.

SCHEMATIC

CRESCENT AMP DISTORTION 5

2M2

1N5817

100uF

GND

+9V

100n

100kB

10k

470R

22n

TL072P

100pF

220n

TL072P

100n

100pF

1N9141N914

10kC

22n

25k

22n

1N9141N914

1uF

GND

GND GND GND

GND

1N914

GND

TC1044SCPA

GND

1N5817 1N5817

10uF

470n

GND

470n

GND

22k

10uF

22k

GND

47uF

GND

OUT

RPD

C15

C16

DRIVE

VOLUME

C1 6

IC1B

IC1A

D4D5

TONE

PRESENCE

D7D6

CLIP

4 5

IC2 D10 D11

C10

C11

C12

C13

C14

VOLTAGE

GND

CRESCENT AMP DISTORTION 6

DRILL TEMPLATE

Cut out this drill template, fold the edges and tape it to the enclosure. Before drilling, it’s recommended

to first use a center punch for each of the holes to help guide the drill bit.

Ensure that this template is printed at 100% or “Actual Size”. You can double-check this by measuring

the scale on the printed page.

Top jack layout assumes the use of closed-frame jacks like the Switchcraft 111X. If you’d rather use

open-frame jacks, please refer to the Open-Frame Jack Drill Template for the top side.

LED hole drill size assumes the use of a 5mm LED bezel, available from several parts suppliers. Adjust

size accordingly if using something different, such as a 3mm bezel, a plastic bezel, or just a plain LED.

0 1 2

0 1

INCH

x: -0.65, y: +1.71 x: 0.65, y: +1.71

ø9/32” ø9/32”

x: -0.85, y: +0.66

ø1/4”

x: 0, y: +0.66

ø9/32”

x: 0, y: -1.20

ø15/32”

x: -0.775, y: -1.20

ø5/16”

CENTER (0,0)

ø3/8” ø1/2”

0.385”

0.625” 0.625”

ø3/8”

OUT DC IN

125B

VOLUME

CLIP TONE

DRIVE

FOOTSWITCHLED

CRESCENT AMP DISTORTION 7

ENCLOSURE LAYOUT

Enclosure is shown without jacks. See next page for jack layout and wiring.

125B

CRESCENT AMP DISTORTION 8

WIRING DIAGRAM

125B

IN +VGND N.C. N.C. OUT

PCB

GND +V +V JACK GND JACK

OUTIN

GND GND PCB

OUT

Shown with optional 9V battery. If battery is omitted, both jacks can be mono rather than one being stereo.

Leave the far-right lug of the DC jack unconnected.

CRESCENT AMP DISTORTION 9

LICENSE & USAGE

No direct support is offered for these projects beyond the provided documentation. It’s assumed

that you have at least some experience building pedals before starting one of these. Replacements and

refunds cannot be offered unless it can be shown that the circuit or documentation are in error.

All of these circuits have been tested in good faith in their base configurations. However, not all the

modifications or variations have necessarily been tested. These are offered only as suggestions based

on the experience and opinions of others.

Projects may be used for commercial endeavors in any quantity unless specifically noted. No

attribution is necessary, though a link back is always greatly appreciated. The only usage restrictions

are that (1) you cannot resell the PCB as part of a kit without prior arrangement, and (2) you cannot

“goop” the circuit, scratch off the screenprint, or otherwise obfuscate the circuit to disguise its source.

(In other words: you don’t have to go out of your way to advertise the fact that you use these PCBs, but

please don’t go out of your way to hide it. The guitar effects industry needs more transparency, not less!)

DOCUMENT REVISIONS

1.0.1 (2021-04-12)

Corrected a few mixed-up capacitor values in the parts list. (The schematic and Mouser spreadsheet

were correct.)

1.0.0 (2021-03-19)

Initial release.

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