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PROJECT NAME
SOMNUS
BASED ON
Sobbat Drive Breaker DB-01
EFFECT TYPE
Distortion / overdrive
PROJECT SUMMARY
A medium-gain distortion & overdrive with a two-band Baxandall tone stack, most notably used by The
Edge during the All That You Can't Leave Behind recording sessions.
Actual size is 2.3" x 2.42" (main board) and 1.78" x 0.86" (bypass board).
SOMNUS AMP DISTORTION
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.0 (2023-03-24)
1
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Summary of Contents for aion SOMNUS
- Page 1 A medium-gain distortion & overdrive with a two-band Baxandall tone stack, most notably used by The Edge during the All That You Can’t Leave Behind recording sessions. Actual size is 2.3” x 2.42” (main board) and 1.78” x 0.86” (bypass board). SOMNUS AMP DISTORTION...
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Page 2: Table Of Contents
The Somnus is based on the first version, and is a direct adaptation except for the addition of a clipping diode switch. The original unit uses one diode in each direction for clipping, but we’ve added options for two diodes or LEDs. -
Page 3: Parts List
LED current-limiting resistor. Adjust value to change LED brightness. Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 3.5mm Film capacitor, 7.2 x 3.5mm Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 3.5mm Film capacitor, 7.2 x 2.5mm SOMNUS AMP DISTORTION... - Page 4 IC socket, DIP-8 DRIVE 16mm right-angle PCB mount pot BASS 10kA 16mm right-angle PCB mount pot TREBLE 10kA 16mm right-angle PCB mount pot LEVEL 10kA 16mm right-angle PCB mount pot CLIP SPDT on-off-on 16mm right-angle PCB mount pot SOMNUS AMP DISTORTION...
- Page 5 Switchcraft 111X or equivalent. 1/4" mono 1/4" phone jack, closed frame Switchcraft 111X or equivalent. 2.1mm DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. SOMNUS AMP DISTORTION...
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Page 6: Build Notes
If anyone has an original unit and could confirm the value of C9 in our schematic (the feedback capacitor of the output stage) then we will update the documentation accordingly. SOMNUS AMP DISTORTION... -
Page 7: Schematic
SCHEMATIC 1N5817 100uF 100n 47uF 47uF IC1A IC1B JRC4558D IC2A JRC4558D TL072 IC2B 220k TL072 CLIP 470R DRIVE IC3A IC3B TL072P TL072P SOMNUS AMP DISTORTION... -
Page 8: Drill Template
0.65, y: +1.71 ø9/32” ø9/32” CLIP x: 0, y: +1.06 TREBLE ø1/4” BASS x: -0.65, y: +0.41 x: 0.65, y: +0.41 ø9/32” ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.775 x: 0, y: -1.775 ø5/16” ø15/32” SOMNUS AMP DISTORTION... -
Page 9: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B SOMNUS AMP DISTORTION... -
Page 10: Wiring Diagram
WIRING DIAGRAM NC OUT GND +V +V JACK GND JACK GND GND PCB 125B SOMNUS AMP DISTORTION... -
Page 11: Document Revisions
(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 1.0.0 (2023-03-24) Initial release. SOMNUS AMP DISTORTION...
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