1590B · 1 knob
Fuzz Dog· Doomed
We're Doomed!
Based on the Audio Surplus Effects OK Doomer· 5 other boards clone it
From the vendor
Massive, blown-out, amp-smashing distortion from the depths of Valhalla.
OK, so all hyperboly aside, it's essentially a Big Muff with no clipping diodes and a simple treble bleed at the output instead of a tone section. Sounds great though.
The original is a one-knob affair, with the INPUT and FILTER controls as internal trimmers. How annoying is that? We've gone for a three-knob approach as we know y'all like to tinker on the fly. If you want it one knob as the original you're going to have to hack in trimmers and wire up the volume pot. If there's enough demand we may re-do the PCB to have it either way, but for now...
The kit is supplied with vertical-mount pots which have round shafts, so you'll need set-screw fitting knobs.
If you want the PCB without parts there's a link for that at the bottom of the page.
Partial kit: PCB, all board-mounted components, pots.
Full kit: As above, plus footswitch and appropriate daughterboard/components for your selected bypass type (see Downloads section for details of those), jack sockets, DC socket, battery snap, hook-up wire, LED.
Enclosure (pre-drilled) is available as an option with full kits, and will not take a battery. Knobs are not included.
Builds are only available with full kits including enclosures. Please choose appropriate knobs.
Inspired by: OK Doomer
Difficulty: Medium
PCB size: 50 x 32mm
Knobs required: 3
Enclosure: 1590B
Direct-Connect compatible (4-way)
Download the INSTRUCTION PDF
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 39 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 22 | ||||
| R1 | 1M | 1M | ||
| R2 | 1K5 | 1.5k | ||
| R3 | 100K | 100k | ||
| R4 | 390R | 390 | ||
| R5 | 470K | 470k | ||
| R6 | 15K | 15k | ||
| R7 | 7K5 | 7.5k | ||
| R8 | 100K | 100k | ||
| R9 | 100R | 100 | ||
| R10 | 470K | 470k | ||
| R11 | 15K | 15k | ||
| R12 | 7K5 | 7.5k | ||
| R13 | 100K | 100k | ||
| R14 | 390R | 390 | ||
| R15 | 470K | 470k | ||
| R16 | 15K | 15k | ||
| R17 | 430K | 430k | ||
| R18 | 100K | 100k | ||
| R19 | 10K | 10k | ||
| R20 | 1K | 1k | ||
| R21 | 2K2 | 2.2k | ||
| R22 | 100R | 100 | ||
| Capacitors 11 | ||||
| C1 | 820n | 820n | ||
| C2 | 470p | 470p | ||
| C3 | 68n | 68n | ||
| C4 | 470p | 470p | ||
| C5 | 82n | 82n | ||
| C6 | 82n | 82n | ||
| C7 | 3n3 | 3.3n | ||
| C8 | 47n | 47n | ||
| C9 | 820n | 820n | ||
| C10 | 100n | 100n | ||
| C11 | 100u | 100u | elec | |
| Diodes 1 | ||||
| D1 | 1N5817 | 1N5817 | ||
| Transistors 4 | ||||
| Q1 | MPSA18 | MPSA18 | ||
| Q2 | MPSA18 | MPSA18 | ||
| Q3 | MPSA18 | MPSA18 | ||
| Q4 | MPSA18 | MPSA18 | ||
| Potentiometers 1 | ||||
| VOL | 100KB | B100k | Potentiometer | |
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