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PROJECT NAME
CERULEAN
BASED ON
Marshall
Bluesbreaker
®
EFFECT TYPE
Amp-like overdrive
PROJECT SUMMARY
A classic overdrive effect that was designed to mimic the Marshall Bluesbreaker amplifier from the
1960s. Also the source circuit for a number of high-dollar "boutique" guitar pedals.
Actual size is 2.3" x 1.86" (main board) and 2.3" x 0.86" (bypass board).
CERULEAN AMP OVERDRIVE
®
BUILD DIFFICULTY
Easy
DOCUMENT VERSION
2.0.0 (2022-11-25)
1
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Table of Contents
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Summary of Contents for Aion Electronics CERULEAN
- Page 1 A classic overdrive effect that was designed to mimic the Marshall Bluesbreaker amplifier from the 1960s. Also the source circuit for a number of high-dollar “boutique” guitar pedals. Actual size is 2.3” x 1.86” (main board) and 2.3” x 0.86” (bypass board). CERULEAN AMP OVERDRIVE...
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Page 2: Table Of Contents
Analogman King of Tone, which is two Bluesbreakers in the same box with a few modifications. The Cerulean project borrows the expanded clipping options from the King of Tone, allowing you to select either soft clipping (stock), hard clipping, or no clipping (boost mode). -
Page 3: Parts List
Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 3.5mm 100uF Electrolytic capacitor, 6.3mm Power supply filter capacitor. 47uF Electrolytic capacitor, 5mm Voltage reference filter capacitor. 100n MLCC capacitor, X7R Power supply filter capacitor. CERULEAN AMP OVERDRIVE... - Page 4 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. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. CERULEAN AMP OVERDRIVE...
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Page 5: Build Notes
The DIP switch settings are as follows: Normal Medium High Note: Position 1 overrides position 2, so if both switches are in the up position, it will be in normal mode. CERULEAN AMP OVERDRIVE... -
Page 6: Schematic
SCHEMATIC 100R 1N5817 100uF 47uF 100n GND GND MODE A GAIN A 120k GAIN B MODE B 470k 47pF 220k 47pF CLIPPING A IC1A IC1B TL072P TL072P CERULEAN AMP OVERDRIVE... -
Page 7: Drill Template
0.65, y: +1.71 ø9/32” ø9/32” CLIPPING TONE MODE x: -0.85, y: +0.66 x: 0, y: +0.66 x: +0.85, y: +0.66 ø1/4” ø9/32” ø1/4” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” CERULEAN AMP OVERDRIVE... -
Page 8: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B CERULEAN AMP OVERDRIVE... -
Page 9: Wiring Diagram
GND +V +V JACK GND JACK GND GND PCB 125B 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. CERULEAN AMP OVERDRIVE... -
Page 10: Document Revisions
• Changed value of C10 for consistency. • Slight layout change, relocating D1 to footswitch board. • Added C11 MLCC capacitor to footswitch board. 1.0.1 (2018-08-14) Corrected parts list to specify LEDs for D6 and D7. Minor formatting adjustments. 1.0.0 (2018-07-04) Initial release. CERULEAN AMP OVERDRIVE...
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