125B · 4 knobs
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
Report a wrong parse| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 26 | ||||
| R1 | 10k | 10k | Metal film resistor, 1/4W | |
| R2 | 1M | 1M | Metal film resistor, 1/4W | |
| R3 | 100k | 100k | Metal film resistor, 1/4W | |
| R4 | 100k | 100k | Metal film resistor, 1/4W | |
| R5 | 220k | 220k | Metal film resistor, 1/4W | |
| R6 | 47k | 47k | Metal film resistor, 1/4W | |
| R7 | 22k | 22k | Metal film resistor, 1/4W | |
| R8 | 10k | 10k | Metal film resistor, 1/4W | |
| R9 | 22k | 22k | Metal film resistor, 1/4W | |
| R10 | 2k2 | 2.2k | Metal film resistor, 1/4W | |
| R11 | 1k | 1k | Metal film resistor, 1/4W | |
| R12 | 10k | 10k | Metal film resistor, 1/4W | |
| R13 | 10k | 10k | Metal film resistor, 1/4W | |
| R14 | 10k | 10k | Metal film resistor, 1/4W | |
| R15 | 47k | 47k | Metal film resistor, 1/4W | |
| R16 | 1k | 1k | Metal film resistor, 1/4W | |
| R17 | 47k | 47k | Metal film resistor, 1/4W | |
| R18 | 1k | 1k | Metal film resistor, 1/4W | |
| R19 | 100k | 100k | Metal film resistor, 1/4W | |
| R20 | 470R | 470 | Metal film resistor, 1/4W | |
| R21 | 8k2 | 8.2k | Metal film resistor, 1/4W | Power supply filter resistor. |
| R22 | 10k | 10k | Metal film resistor, 1/4W | Power supply filter resistor. |
| R23 | 8k2 | 8.2k | Metal film resistor, 1/4W | Power supply filter resistor. |
| R24 | 10k | 10k | Metal film resistor, 1/4W | Power supply filter resistor. |
| RPD | 2M2 | 2.2M | Metal film resistor, 1/4W | Input pull-down resistor. Can be as low as 1M. |
| LEDR | 10k | 10k | Metal film resistor, 1/4W | LED current-limiting resistor. Adjust value to change LED brightness. |
| Capacitors 18 | ||||
| C1 | 22n | 22n | Film capacitor, 7.2 x 2.5mm | |
| C2 | 1uF | 1u | Film capacitor, 7.2 x 3.5mm | |
| C3 | 1uF | 1u | Film capacitor, 7.2 x 3.5mm | |
| C4 | 6n8 | 6.8n | Film capacitor, 7.2 x 2.5mm | |
| C5 | 1uF | 1u | Film capacitor, 7.2 x 3.5mm | |
| C6 | 68n | 68n | Film capacitor, 7.2 x 2.5mm | |
| C7 | 1uF | 1u | Film capacitor, 7.2 x 2.5mm | |
| C8 | 1uF | 1u | MLCC capacitor, NP0/C0G | |
| C9 | 22n | 22n | MLCC capacitor, NP0/C0G | |
| C10 | 1uF | 1u | Film capacitor, 7.2 x 3.5mm | |
| C11 | 33n | 33n | Film capacitor, 7.2 x 2.5mm | |
| C12 | 100n | 100n | Film capacitor, 7.2 x 2.5mm | |
| C13 | 1n | 1n | Film capacitor, 7.2 x 2.5mm | |
| C14 | 1uF | 1u | MLCC capacitor, NP0/C0G | |
| C15 | 47uF | 47u | Film capacitor, 7.2 x 3.5mm | Reference voltage filter capacitor. |
| C16 | 47uF | 47u | Film capacitor, 7.2 x 2.5mm | Reference voltage filter capacitor. |
| C17 | 100uF | 100u | Film capacitor, 7.2 x 2.5mm | Power supply filter capacitor. |
| C18 | 100n | 100n | Film capacitor, 7.2 x 2.5mm | Power supply filter capacitor. |
| Diodes 7 | ||||
| D1 | 1N5817 | 1N5817 | Schottky diode, DO-41 | |
| D2 | 1N914 | 1N914 | Fast-switching diode, DO-35 | |
| D3 | 1N914 | 1N914 | Fast-switching diode, DO-35 | |
| D4 | 1N914 | 1N914 | Fast-switching diode, DO-35 | |
| D5 | 1N914 | 1N914 | Fast-switching diode, DO-35 | |
| D6 | 1N914 | 1N914 | Fast-switching diode, DO-35 | |
| D7 | 1N914 | 1N914 | Fast-switching diode, DO-35 | |
| ICs 3 | ||||
| IC1 | JRC4558D | JRC4558D | Operational amplifier, DIP8 | |
| IC2 | TL072 | TL072 | Operational amplifier, dual, DIP8 | IC2 and IC3 are a single TL074 (quad) in the original. |
| IC3 | TL072 | TL072 | Operational amplifier, dual, DIP8 | IC2 and IC3 are a single TL074 (quad) in the original. |
| Potentiometers 3 | ||||
| DRIVE | 1MB | B1M | 16mm right-angle PCB mount pot | |
| BASS | 10kA | A10k | 16mm right-angle PCB mount pot | |
| LEVEL | 10kA | A10k | 16mm right-angle PCB mount pot | |
| Switches 2 | ||||
| CLIP | SPDT on-off-on | SPDT ON-OFF-ON | 16mm right-angle PCB mount pot | |
| FSW | 3PDT | 3PDT | Stomp switch, 3PDT | |
| LEDs 3 | ||||
| D8 | 5mm LED | 5MM LED | LED, 5mm, red diffused | |
| D9 | 5mm LED | 5MM LED | LED, 5mm, red diffused | |
| LED | 5mm | 5MM | LED, 5mm, red diffused | |
| Jacks & sockets 6 | ||||
| IC1-S | DIP-8 socket | DIP-8 SOCKET | IC socket, DIP-8 | |
| IC2-S | DIP-8 socket | DIP-8 SOCKET | IC socket, DIP-8 | |
| IC3-S | DIP-8 socket | DIP-8 SOCKET | IC socket, DIP-8 | |
| IN | 1/4" mono | 1/4" MONO | 1/4" phone jack, closed frame | Switchcraft 111X or equivalent. |
| OUT | 1/4" mono | 1/4" MONO | 1/4" phone jack, closed frame | Switchcraft 111X or equivalent. |
| DC | 2.1mm | 2.1MM | DC jack, 2.1mm panel mount | Mouser 163-4302-E or equivalent. |
| Hardware 1 | ||||
| ENC | 125B | 125B | Enclosure, die-cast aluminum | Can also use a Hammond 1590N1. |