Akashic Guitar effects circuit lookup
TONEDRIVEVOLUME

1590B · 3 knobs

Aion FX

Cerulean (Legacy)

Based on the Marshall Bluesbreaker· 19 other boards clone it

Category
Overdrive
Controls
Tone · Drive · Volume
Difficulty
Easy
Price
see vendor
Buy the PCB at Aion FX Build document Build Documentation (V1) pdf

From the vendor

A classic overdrive effect that was designed to mimic the Marshall Bluesbreaker amplifier from the 1960s, the Bluesbreaker is also the source circuit for a number of high-dollar "boutique" guitar pedals.

With this project, you can build an original Bluesbreaker or either of the most popular clones, the Analogman King of Tone and the JHS Morning Glory, or your own custom flavor. Like the Stratus (Tube Screamer) project, its feedback clipping section is extremely flexible and allows for any imaginable combination of diodes as well as a switch to go between two configurations. The second switch optionally allows you to include a Bright Cut mod (from the Morning Glory) or a hard-clipping mod (from the King of Tone).

Demo videos

Here’s a demo video from Ryan Wood testing out a Cerulean built to Morning Glory specs:

Schematic

The schematic is in the vendor's build document. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 33 rows

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RefValueNormalizedTypeNotes
Resistors 11
R11M1M
R23k33.3k
R34k74.7k
R410k10k
R5220k220k
R66k86.8k
R71k1k
R86k86.8k
R91M1M
R1047k47k
R1147k47k
Capacitors 10
C110n10n
C247pF47p
C310n10n
C410n10n
C5100n100n
C610n10n
C710n10n
C8100n100n
C10100uF100u
C11100uF100u
Diodes 5
D11N9141N914
D21N9141N914
D31N9141N914
D41N9141N914
D111N40021N4002
ICs 1
IC1TL072TL072
Potentiometers 3
TONE25KBB25kPotentiometer
DRIVE100KBB100kPotentiometer
VOLUME100KAA100kPotentiometer
Switches 1
SW2SPDTSPDT
LEDs 1
LED1intoINTO
Jacks & sockets 1
J1toTO

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