1590B · 4 knobs
Nebula (Legacy)
Based on the Maxon DS-830 Distortion Master· 3 other boards clone it
- Category
- Distortion
- Difficulty
- Intermediate
- Price
- see vendor
From the vendor
The Nebula Distortion is a clone of the Maxon DS-830 Distortion Master, a high-gain entry in Maxon’s line of pedals. It’s got a lot in common with the Ibanez MT-10 Mostortion, the main difference being an active two-band tonestack which uses simulated inductors (gyrators) in place of the MT-10’s passive 3-band tonestack which is more like what you’d find on a Fender or Marshall amplifier. The DS-830 also has a hard-clipping stage after the feedback-loop clipping.
Due to the size of the circuit, I wasn’t able to fit any switch mods like for clipping diodes. I did include a Softness trimmer like on most of my other PCBs that use hard clipping. By turning up this control, you reduce the effect of the hard clipping diodes and round it out a bit. You can read more about this control on AMZ (Jack Orman calls it “warp” rather than “soft”).
Schematic
The schematic is in the vendor's build document, page 3. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 55 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 24 | ||||
| R4 | 10k | 10k | ||
| R5 | 100k | 100k | ||
| R6 | 2k | 2k | ||
| R7 | 390R | 390 | ||
| R8 | 1k | 1k | ||
| R9 | 10k | 10k | ||
| R10 | 100k | 100k | ||
| R11 | 3k9 | 3.9k | ||
| R12 | 220R | 220 | ||
| R13 | 10k | 10k | ||
| R14 | 10k | 10k | ||
| R15 | 560R | 560 | ||
| R16 | 10k | 10k | ||
| R17 | 22k | 22k | ||
| R18 | 3k | 3k | ||
| R19 | 510k | 510k | ||
| R20 | 10k | 10k | ||
| R21 | 100k | 100k | ||
| R22 | 470R | 470 | ||
| R23 | 10k | 10k | ||
| R1 | 10k | 10k | ||
| R24 | 10k | 10k | ||
| R2 | 1M | 1M | ||
| R3 | 10k | 10k | ||
| Capacitors 17 | ||||
| C1 | 100n | 100n | ||
| C2 | 3n9 | 3.9n | ||
| C3 | 1uF | 1u | ||
| C4 | 10pF | 10p | ||
| C5 | 1uF | 1u | ||
| C6 | 10uF | 10u | elec | |
| C7 | 470n | 470n | ||
| C8 | 220n | 220n | ||
| C9 | 3.3uF | 3.3u | elec | |
| C10 | 47n | 47n | ||
| C11 | 100n | 100n | ||
| C12 | 3n3 | 3.3n | ||
| C13 | 10uF | 10u | elec | |
| C14 | 100n | 100n | ||
| C15 | 10uF | 10u | elec | |
| C16 | 100uF | 100u | elec | |
| C17 | 47uF | 47u | elec | |
| Diodes 4 | ||||
| D6 | 1N914 | 1N914 | ||
| D7 | 1N914 | 1N914 | ||
| D5 | 1N914 | 1N914 | ||
| D1 | 1N4002 | 1N4002 | ||
| Transistors 4 | ||||
| Q2 | 2N5088 | 2N5088 | ||
| Q3 | 2N5088 | 2N5088 | ||
| Q4 | 2N5088 | 2N5088 | ||
| Q1 | 2N5457 | 2N5457 | ||
| ICs 1 | ||||
| IC1 | JRC4558D | JRC4558D | ||
| Potentiometers 4 | ||||
| GAIN | 250KA | A250k | Potentiometer | |
| LEVEL | 100KA | A100k | Potentiometer | |
| BASS | 25KB | B25k | Potentiometer | |
| TREBLE | 10KB | B10k | Potentiometer | |
| LEDs 1 | ||||
| LED1 | into | INTO | ||
Other boards based on the Maxon DS-830 Distortion Master
- Nebula Aion FX · 125B · $12.50
- Maxon DS-830 Distortion Master Dirtbox Layouts
- Maxon DS-830 Distortion Master Tagboard Effects