1590B · 3 knobs
Comet (Legacy)
Based on the Boss DS-1 Distortion· 2 other boards clone it
- Category
- Distortion
- Controls
- Distortion · Tone · Volume
- Difficulty
- Intermediate
- Price
- see vendor
From the vendor
The Comet Distortion project is a clone of the classic orange BOSS DS-1 Distortion, in continuous production since 1978. It’s got a few things going on in the circuit—the pregain and tone sections are very similar to the Big Muff, while the diode-to-ground hard clipping is similar to circuits like the Distortion+.
The DS-1 had a major circuit revision in 1994 that dropped the original single op-amp in favor of a dual, along with some other changes to accommodate. The original “Made in Japan” version is very well-regarded, while the revised “post-1994” version is not as much. However, it is one of the most frequently-modified pedals out there, with great mods available from Keeley, Analogman and Monte Allums. The circuit itself is a good one—it just suffers from cheap components.
The Comet Distortion will allow you to build either the pre- or post-1994 versions of the circuit, as well as incorporating most of the popular modifications.
Schematic
The schematic is in the vendor's build document. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 54 rows
Report a wrong parse| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 23 | ||||
| R1 | 1k | 1k | ||
| R2 | 470k | 470k | ||
| R3 | 10k | 10k | ||
| R4 | 100k | 100k | ||
| R5 | 470k | 470k | ||
| R6 | 10k | 10k | ||
| R7 | 22R | 22 | ||
| R8 | 100k | 100k | ||
| R9 | 100k | 100k | ||
| R10 | 4k7 | 4.7k | ||
| R11 | 27k | 27k | ||
| R12 | 2k2 | 2.2k | ||
| R13 | 6k8 | 6.8k | ||
| R14 | 2k2 | 2.2k | ||
| R15 | 6k8 | 6.8k | ||
| R16 | 10k | 10k | ||
| R17 | 1M | 1M | ||
| R18 | 10k | 10k | ||
| R19 | 1k | 1k | ||
| R20 | 100k | 100k | ||
| R21 | 10k | 10k | ||
| R22 | 10k | 10k | ||
| R23 | 20k | 20k | ||
| Capacitors 15 | ||||
| C1 | 47n | 47n | ||
| C2 | 42n | 42n | ||
| C3 | 250pF | 250p | ||
| C4 | 470n | 470n | ||
| C5 | 250pF | 250p | ||
| C6 | 150pF | 150p | ||
| C7 | 1uF | 1u | ||
| C8 | 470n | 470n | ||
| C9 | 10n | 10n | ||
| C10 | 22n | 22n | ||
| C11 | 100n | 100n | ||
| C12 | 47n | 47n | ||
| C13 | 1uF | 1u | ||
| C14 | 100uF | 100u | ||
| C15 | 47uF | 47u | ||
| Diodes 4 | ||||
| D2 | 1N914 | 1N914 | ||
| D3 | 1N914 | 1N914 | ||
| D1 | 1N4002 | 1N4002 | ||
| D6 | 1N914 | 1N914 | ||
| Transistors 3 | ||||
| Q1 | 2N5088 | 2N5088 | ||
| Q2 | 2N5088 | 2N5088 | ||
| Q3 | 2N5088 | 2N5088 | ||
| ICs 2 | ||||
| IC1 | (vintage) | (VINTAGE) | ||
| IC2 | (modern) | (MODERN) | ||
| Potentiometers 4 | ||||
| DISTORTION | 100KB | B100k | Potentiometer | |
| TONE | 25KB | B25k | Potentiometer | |
| VOLUME | 100KB | B100k | Potentiometer | |
| RPD | 1M | 1M | Potentiometer | |
| LEDs 3 | ||||
| D4 | 3mm LED | 3MM LED | ||
| D5 | 3mm LED | 3MM LED | ||
| LED1 | into | INTO | ||