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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, the Bluesbreaker is 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
1.1.0 (2020-05-18)
1
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Summary of Contents for aion CERULEAN
- Page 1 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. Actual size is 2.3” x 1.86” (main board) and 2.3” x 0.86” (bypass board). CERULEAN AMP OVERDRIVE...
- Page 2 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: •...
- Page 3 Omit if using Morning Glory gain stage. (see build notes) 100uF Electrolytic capacitor, 6.3mm Power supply filter capacitor. 47uF Electrolytic capacitor, 6.3mm Voltage reference filter capacitor. 100n MLCC capacitor, X7R Power supply filter capacitor. Added in v1.1. 100pF MLCC capacitor, NP0/C0G Optional high-frequency feedback 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...
- Page 5 If you use a 1790NS enclosure you could fit two of these side by side. Information on this will be provided for this at a later date, but as of right now it is outside the scope of the documentation. CERULEAN AMP OVERDRIVE...
- Page 6 SCHEMATIC 1N5817 SOFT 100n 100uF 47uF GND GND 220k 100pF DRIVE 100kB TL072P IC1A 2N5457 50kB TL072P PRESENCE 10uF IC1B CERULEAN AMP OVERDRIVE...
- Page 7 0.65, y: +1.71 ø9/32” ø9/32” HARD CLIP TONE SOFT CLIP 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 is shown without jacks. See next page for jack layout and wiring. 125B CERULEAN AMP OVERDRIVE...
- Page 9 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 • 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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