125B · 8 knobs
Biggus Dickus
Based on the PedalPCB Chuck D. Bones Biggus Dickus· 1 other board clones it
- Category
- Distortion
- Price
- see vendor
- Tags
- verified, gerbers, faceplate, CC BY-NC-SA 4.0
From the vendor
Biggus Dickus is a PCB and faceplate for Chuck D. Bones' infamous Biggus Dickus circuit, a dirt pedal loosely based on the Krank Distortus Maximus: a Sziklai pair (JFET and PNP) first stage driving an LM386 into a Marshall style treble / middle / bass tone stack. The circuit design is all Chuck's, I've only added a few things so I could dial it in like I'd like and fiddle with the bias a little bit. Yes, the eyes light up red when playing and the on indicator is a phallic shaped roman helmet. It also happens to sound amazing.
You can see the build report here.
Built
Schematic
Drawn by Cryptid Effects, CC BY-NC-SA 4.0. Gerbers and faceplate on GitHub.
Parts list 50 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 16 | ||||
| R1 | 1M | 1M | Pull down resistor | |
| R2 | 10k | 10k | ||
| R3 | 390k | 390k | ||
| R4 | 680R | 680 | In series with RV1, sets the bias | |
| R5 | 1k5 | 1.5k | ||
| R6 | 2k7 | 2.7k | ||
| R7 | 680R | 680 | ||
| R8 | 47k | 47k | ||
| R9 | 68R | 68 | Crush switch | |
| R10 | 330R | 330 | Crush switch | |
| R11 | 22R | 22 | ||
| R12 | 2k2 | 2.2k | ||
| R13 | 1k | 1k | Eye LEDs, can be omitted if you are not using them | |
| R14 | 22k | 22k | ||
| R15 | 100k | 100k | Eye LEDs | |
| R100 | 4k7 | 4.7k | Current limiting resistor, choose to taste | |
| Capacitors 18 | ||||
| C1 | 1nF | 1n | Film | |
| C2 | 47nF | 47n | Film, Fat switch | |
| C3 | 47uF | 47u | Electrolytic | |
| C4 | 220nF | 220n | Film | |
| C5 | 4n7 | 4.7n | Film, Bright switch | |
| C6 | 1nF | 1n | Film | |
| C7 | 47uF | 47u | Electrolytic | |
| C8 | 47uF | 47u | Electrolytic | |
| C9 | 47nF | 47n | Film | |
| C10 | 10nF | 10n | Film | |
| C11 | 2u2 | 2.2u | Electrolytic | |
| C12 | 470nF | 470n | Film | |
| C13 | 47uF | 47u | Electrolytic, Eye LEDs, can be omitted if you are not using them | |
| C14 | 4n7 | 4.7n | Film | |
| C100 | 100uF | 100u | Electrolytic | |
| C101 | 100nF | 100n | Film | |
| C102 | 100uF | 100u | Electrolytic | |
| C103 | 100nF | 100n | Film | |
| Diodes 1 | ||||
| D100 | 1N5817 | 1N5817 | ||
| Transistors 2 | ||||
| Q1 | JFET | JFET | Chuck's schematic calls for an MPF4393, he recommends a JFET with a Vp around -1V | |
| Q2 | 2N5087 | 2N5087 | ||
| ICs 1 | ||||
| U3 | LM386 | LM386 | Chuck used a JRC NJM386 in his final version | |
| Potentiometers 5 | ||||
| Gain | C1k | C1k | Potentiometer | 16mm right angle pot |
| Treble | B10k | B10k | Potentiometer | 16mm right angle pot |
| Middle | B1k | B1k | Potentiometer | 16mm right angle pot |
| Bass | A10k | A10k | Potentiometer | 16mm right angle pot |
| Level | A50k | A50k | Potentiometer | 16mm right angle pot |
| Trimmers 1 | ||||
| RV1 | 1k | 1k | Trimmer | Trimmer, bias adjustment |
| Switches 3 | ||||
| Fat | SPDT | SPDT | Switch | On / On |
| Bright | SPDT | SPDT | Switch | On / On |
| Crush | SPDT | SPDT | Switch | On / Off / On |
| LEDs 3 | ||||
| D101 | LED 3mm | LED 3MM | Status LED, choose your poison, 5mm works as well. | |
| D102 | LED red | LED RED | Eye LED | |
| D103 | LED red | LED RED | Eye LED | |
Other boards based on the PedalPCB Chuck D. Bones Biggus Dickus
- PedalPCB / Chuck D. Bones Biggus Dickus Dirtbox Layouts