125B · 4 knobs
NebulaVintage Distortion
Based on the Maxon DS-830· 1 other board clones it
- Category
- Distortion
- Controls
- Gain · Bass · Treble · Level
- Difficulty
- Intermediate
- Price
- $12.50in stock
From the vendor
A vintage-inspired distortion that uses both hard and soft clipping along with an active boost or cut for both bass and treble frequencies.
The Nebula Vintage Distortion is based on the Maxon DS-830 Distortion Master, first released in 2001 as part of Maxon’s Vintage Series. While the circuit was a brand new design, its aesthetics were inspired by the “big box” Maxon and Ibanez effects of the late 1970s such as the OD-880 and Phase Tone II.
The DS-830 circuit features both hard and soft clipping, with op-amp feedback diodes followed by diodes to ground, similar to the Nobels ODR-1. The EQ is made of two active gyrators, a bass control at 126 Hz and a treble control at 2.5kHz. Each of these frequencies can be boosted or cut as needed.
The updated version of the Nebula includes one new feature: a 3-way toggle switch that allows you to select soft clipping only, hard clipping only, or the stock mode with both sets of diodes engaged. This lends a bit of extra control over the clipping character not found in the original pedal. Other than this addition, it’s a direct adaptation of the DS-830.
Note: This project uses a type of capacitor that has been temporarily discontinued by WIMA. Please see our news article about the issue and the substitution spreadsheet for project-specific recommendations. We are stocking a limited supply in the mean time. The build document has not yet been updated to reflect this.
Schematic
The schematic is in the vendor's build document, page 6. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 66 rows
Report a wrong parse| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 27 | ||||
| R1 | 10k | 10k | Metal film resistor, 1/4W | |
| R2 | 1M | 1M | Metal film resistor, 1/4W | |
| R3 | 10k | 10k | Metal film resistor, 1/4W | |
| R4 | 10k | 10k | Metal film resistor, 1/4W | |
| R5 | 100k | 100k | Metal film resistor, 1/4W | |
| R6 | 2k | 2k | Metal film resistor, 1/4W | |
| R7 | 390R | 390 | Metal film resistor, 1/4W | |
| R8 | 1k | 1k | Metal film resistor, 1/4W | |
| R9 | 10k | 10k | Metal film resistor, 1/4W | |
| R10 | 100k | 100k | Metal film resistor, 1/4W | |
| R11 | 22k | 22k | Metal film resistor, 1/4W | |
| R12 | 10k | 10k | Metal film resistor, 1/4W | |
| R13 | 560R | 560 | Metal film resistor, 1/4W | |
| R14 | 3k9 | 3.9k | Metal film resistor, 1/4W | |
| R15 | 10k | 10k | Metal film resistor, 1/4W | |
| R16 | 10k | 10k | Metal film resistor, 1/4W | |
| R17 | 220R | 220 | Metal film resistor, 1/4W | |
| R18 | 3k | 3k | Metal film resistor, 1/4W | |
| R19 | 510k | 510k | Metal film resistor, 1/4W | |
| R20 | 10k | 10k | Metal film resistor, 1/4W | |
| R21 | 100k | 100k | Metal film resistor, 1/4W | |
| R22 | 470R | 470 | Metal film resistor, 1/4W | |
| R23 | 10k | 10k | Metal film resistor, 1/4W | |
| R24 | 10k | 10k | Metal film resistor, 1/4W | |
| R25 | 100R | 100 | Metal film resistor, 1/4W | |
| RPD | 2M2 | 2.2M | Metal film resistor, 1/4W | Input pulldown resistor. Can be as low as 1M. |
| LEDR | 4k7 | 4.7k | Metal film resistor, 1/4W | LED current-limiting resistor. Adjust value to change LED brightness. |
| Capacitors 18 | ||||
| C1 | 100n | 100n | Film capacitor, 7.2 x 2.5mm | |
| C2 | 3n9 | 3.9n | Film capacitor, 7.2 x 2.5mm | |
| C3 | 1uF | 1u | Film capacitor, 7.2 x 3.5mm | |
| C4 | 10pF | 10p | MLCC capacitor, NP0/C0G | |
| C5 | 1uF | 1u | Film capacitor, 7.2 x 3.5mm | |
| C6 | 1uF | 1u | Film capacitor, 7.2 x 3.5mm | |
| C7 | 470n | 470n | Film capacitor, 7.2 x 3mm | |
| C8 | 100n | 100n | Film capacitor, 7.2 x 2.5mm | |
| C9 | 3n3 | 3.3n | Film capacitor, 7.2 x 2.5mm | |
| C10 | 3.3uF | 3.3u | Film capacitor, 7.2 x 5.5mm | |
| C11 | 220n | 220n | Film capacitor, 7.2 x 2.5mm | |
| C12 | 47n | 47n | Film capacitor, 7.2 x 2.5mm | |
| C13 | 1uF | 1u | Film capacitor, 7.2 x 3.5mm | |
| C14 | 100n | 100n | Film capacitor, 7.2 x 2.5mm | |
| C15 | 1uF | 1u | Film capacitor, 7.2 x 3.5mm | |
| C16 | 220uF | 220u | Electrolytic capacitor, 6.3mm | Reference voltage filter capacitor. |
| C17 | 220uF | 220u | Electrolytic capacitor, 6.3mm | Power supply filter capacitor. |
| C18 | 100n | 100n | MLCC capacitor, X7R | Power supply filter capacitor. |
| Diodes 5 | ||||
| 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 | |
| Transistors 4 | ||||
| Q1 | 2N5457 | 2N5457 | JFET, N-channel, TO-92 | Substitute. Original uses 2SK256-Y. |
| Q2 | 2N5088 | 2N5088 | BJT transistor, NPN, TO-92 | Substitute. Original uses 2SC1815-BL. |
| Q3 | 2N5088 | 2N5088 | BJT transistor, NPN, TO-92 | Substitute. Original uses 2SC1815-BL. |
| Q4 | 2N5088 | 2N5088 | BJT transistor, NPN, TO-92 | Substitute. Original uses 2SC1815-BL. |
| ICs 1 | ||||
| IC1 | JRC4558D | JRC4558D | Operational amplifier, DIP8 | |
| Potentiometers 3 | ||||
| GAIN | 250kA | A250k | 16mm right-angle PCB mount pot | |
| BASS | 5kC | C5k | 16mm right-angle PCB mount pot | |
| LEVEL | 100kA | A100k | 16mm right-angle PCB mount pot | |
| Switches 2 | ||||
| CLIP | DPDT on-on-on T | DPDT ON-ON-ON T | oggle switch, DPDT on-on-on | See build notes for possible modifications. |
| FSW | 3PDT | 3PDT | Stomp switch, 3PDT | |
| LEDs 1 | ||||
| LED | 5mm | 5MM | LED, 5mm, red diffused | |
| Jacks & sockets 4 | ||||
| IC1-S | DIP-8 socket | DIP-8 SOCKET | IC socket, DIP-8 | |
| IN | 1/4" stereo | 1/4" STEREO | 1/4" phone jack, closed frame | Switchcraft 112BX 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. |
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