Enclosure not stated · 3 knobs
MXR Custom Badass '78 DistortionVerified
Based on the MXR Custom Badass '78 Distortion· 4 other boards clone it
- Category
- Distortion
- Controls
- Distortion · Tone · Output
- Build
- Vero· 21×18· 25 cuts, 10 links
- Layout
- Verified · Tagboard Effects marks it as built and working
- Tags
- Distortion, MXR
From the post
The first in a line from the MXR Custom Badass design team, the MXR Custom Badass ’78 Distortion is a factory-modded pedal that roars with huge amp stack tones and old school tube amp-like distortion.
We took a classic distortion circuit and hot-rodded it to the next level for over-the-top soaring leads and rich, saturated rhythms. With only three knobs, dialing in Badass tone is a cinch. The CRUNCH button allows you to choose between two different modes of diode and LED clipping, boosting the harmonic content of the distortion.
The '78 Distortion's wide open amp-like sound sounds great whether it's in front of a clean amp, a slightly dirty amp, or a full on overdriven amp. Under the hood, this high performance machine features top notch circuitry and hardware meant for a lifetime of use.
Some of the cap values may seem a bit off. These are the measured values of the SMD components on the actual board. So i suggest you try on the values that are closest to the ones measured. Same thing with semiconductors.
Now this layout is also verified, thanks to Csaba and John for their footwork.
Schematic
This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.
Parts list 33 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 3 values the reader of this layout was not sure of
- 38nF top centre: printed clearly, unusual value
- 72nF right side by the 2.2K: printed clearly, unusual value
- 890nF below centre left: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 14 | ||||
| ×1 | 22Ω | 22 | read from the layout by eye | |
| ×1 | 470Ω | 470 | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×2 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| ×2 | 6.8K | 6.8k | read from the layout by eye | |
| ×6 | 10K | 10k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×4 | 100K | 100k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×1 | 1.8M | 1.8M | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| Capacitors 10 | ||||
| ×2 | 100pF | 100p | read from the layout by eye | |
| ×1 | 38nF | 38n | read from the layout by eye | |
| ×3 | 47nF | 47n | read from the layout by eye | |
| ×1 | 72nF | 72n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 890nF | 890n | read from the layout by eye | |
| ×2 | 1uF | 1u | read from the layout by eye | |
| ×1 | 2.2uF | 2.2u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×2 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×2 | 1N4148 | 1N4148 | D1, D2; read from the layout by eye | |
| ×3 | 1N4148 | 1N4148 | D5, D6, D7; read from the layout by eye | |
| Transistors 1 | ||||
| ×3 | MPSA14 | MPSA14 | or similar NPN Si Darlington; read from the layout by eye | |
| ICs 1 | ||||
| IC1 | TLC2262 | TLC2262 | try 4558 or TL072; read from the layout by eye | |
| Potentiometers 3 | ||||
| Distortion | C100K | C100k | Potentiometer | read from the layout by eye |
| Tone | B10K | B10k | Potentiometer | read from the layout by eye |
| Output | B100K | B100k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| SW | ? | ? | value not given; two wires SW1 and SW2; read from the layout by eye | |
| LEDs 1 | ||||
| ×2 | 3mm red LED | 3MM RED LED | D3, D4; read from the layout by eye | |
Other boards based on the MXR Custom Badass '78 Distortion
- MXR Custom Badass '78 Distortion Dirtbox Layouts
- MXR Custom Badass '78 Distortion Effects Layouts (blog)
- Custom Badass 78 PCBWay: Glory to Ukraine
- Patron Distortion PedalPCB · 125B · $12.00