Akashic Guitar effects PCB lookup
DRIVETREBLEBASSVOLUME

125B · 4 knobs

Aion FX

SomnusAmp Distortion

Based on the Sobbat DB-01 Drive Breaker

Category
Distortion· Distortion / overdrive
Controls
Drive · Treble · Bass · Volume
Difficulty
Intermediate
Price
$12.50in stock

From the vendor

A medium-gain distortion & overdrive with a two-band Baxandall tone stack, most notably used by The Edge.

The Somnus Amp Distortion is an adaptation of the Sobbat DB-01 Drive Breaker, a somewhat obscure pedal from Japan that was originally released in 1995.

It’s perhaps best known for its association with The Edge, who first started using it during the recording of All That You Can’t Leave Behind where it featured most prominently on the song “New York”. According to his guitar tech Dallas Schoo, he also used it on the outro solo for “Until the End of the World” during the Elevation and Vertigo tours, and it has been spotted in the live rig as of the 360 tour.

Sobbat has released three followup versions of the Drive Breaker called the DB-2, DB-3 and DB-4. None of these have been traced to our knowledge, but they don’t seem to be drastically different from the original, which is still by far the most famous and is still produced along with its successors.

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.

Schematic

The schematic is in the vendor's build document, page 7. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 69 rows

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RefValueNormalizedTypeNotes
Resistors 26
R110k10kMetal film resistor, 1/4W
R21M1MMetal film resistor, 1/4W
R3100k100kMetal film resistor, 1/4W
R4100k100kMetal film resistor, 1/4W
R5220k220kMetal film resistor, 1/4W
R647k47kMetal film resistor, 1/4W
R722k22kMetal film resistor, 1/4W
R810k10kMetal film resistor, 1/4W
R922k22kMetal film resistor, 1/4W
R102k22.2kMetal film resistor, 1/4W
R111k1kMetal film resistor, 1/4W
R1210k10kMetal film resistor, 1/4W
R1310k10kMetal film resistor, 1/4W
R1410k10kMetal film resistor, 1/4W
R1547k47kMetal film resistor, 1/4W
R161k1kMetal film resistor, 1/4W
R1747k47kMetal film resistor, 1/4W
R181k1kMetal film resistor, 1/4W
R19100k100kMetal film resistor, 1/4W
R20470R470Metal film resistor, 1/4W
R218k28.2kMetal film resistor, 1/4WPower supply filter resistor.
R2210k10kMetal film resistor, 1/4WPower supply filter resistor.
R238k28.2kMetal film resistor, 1/4WPower supply filter resistor.
R2410k10kMetal film resistor, 1/4WPower supply filter resistor.
RPD2M22.2MMetal film resistor, 1/4WInput pull-down resistor. Can be as low as 1M.
LEDR10k10kMetal film resistor, 1/4WLED current-limiting resistor. Adjust value to change LED brightness.
Capacitors 18
C122n22nFilm capacitor, 7.2 x 2.5mm
C21uF1uFilm capacitor, 7.2 x 3.5mm
C31uF1uFilm capacitor, 7.2 x 3.5mm
C46n86.8nFilm capacitor, 7.2 x 2.5mm
C51uF1uFilm capacitor, 7.2 x 3.5mm
C668n68nFilm capacitor, 7.2 x 2.5mm
C71uF1uFilm capacitor, 7.2 x 2.5mm
C81uF1uMLCC capacitor, NP0/C0G
C922n22nMLCC capacitor, NP0/C0G
C101uF1uFilm capacitor, 7.2 x 3.5mm
C1133n33nFilm capacitor, 7.2 x 2.5mm
C12100n100nFilm capacitor, 7.2 x 2.5mm
C131n1nFilm capacitor, 7.2 x 2.5mm
C141uF1uMLCC capacitor, NP0/C0G
C1547uF47uFilm capacitor, 7.2 x 3.5mmReference voltage filter capacitor.
C1647uF47uFilm capacitor, 7.2 x 2.5mmReference voltage filter capacitor.
C17100uF100uFilm capacitor, 7.2 x 2.5mmPower supply filter capacitor.
C18100n100nFilm capacitor, 7.2 x 2.5mmPower supply filter capacitor.
Diodes 7
D11N58171N5817Schottky diode, DO-41
D21N9141N914Fast-switching diode, DO-35
D31N9141N914Fast-switching diode, DO-35
D41N9141N914Fast-switching diode, DO-35
D51N9141N914Fast-switching diode, DO-35
D61N9141N914Fast-switching diode, DO-35
D71N9141N914Fast-switching diode, DO-35
ICs 3
IC1JRC4558DJRC4558DOperational amplifier, DIP8
IC2TL072TL072Operational amplifier, dual, DIP8IC2 and IC3 are a single TL074 (quad) in the original.
IC3TL072TL072Operational amplifier, dual, DIP8IC2 and IC3 are a single TL074 (quad) in the original.
Potentiometers 3
DRIVE1MBB1M16mm right-angle PCB mount pot
BASS10kAA10k16mm right-angle PCB mount pot
LEVEL10kAA10k16mm right-angle PCB mount pot
Switches 2
CLIPSPDT on-off-onSPDT ON-OFF-ON16mm right-angle PCB mount pot
FSW3PDT3PDTStomp switch, 3PDT
LEDs 3
D85mm LED5MM LEDLED, 5mm, red diffused
D95mm LED5MM LEDLED, 5mm, red diffused
LED5mm5MMLED, 5mm, red diffused
Jacks & sockets 6
IC1-SDIP-8 socketDIP-8 SOCKETIC socket, DIP-8
IC2-SDIP-8 socketDIP-8 SOCKETIC socket, DIP-8
IC3-SDIP-8 socketDIP-8 SOCKETIC socket, DIP-8
IN1/4" mono1/4" MONO1/4" phone jack, closed frameSwitchcraft 111X or equivalent.
OUT1/4" mono1/4" MONO1/4" phone jack, closed frameSwitchcraft 111X or equivalent.
DC2.1mm2.1MMDC jack, 2.1mm panel mountMouser 163-4302-E or equivalent.
Hardware 1
ENC125B125BEnclosure, die-cast aluminumCan also use a Hammond 1590N1.