Enclosure not stated · 2 knobs
MXR Blue Box w. modsVerified
Based on the MXR Blue Box· 6 other boards clone it
From the post
Couldn't resist to add another layout for the Blue Box since there is a bunch of mods online... • Octave switch that toggles between stock two octave down setting and one octave down setting.
• Treble boost switch that lifts up 10nF low pass filter cap before the Output control. Should result in an overall brighter and louder tone. • Both potentiometers is increased from 50k to 100k. This is supoosed to increase the overall output. One untested mod that could be fun to try out would be replacing 330ohm resistor that sends voltage to the CD4013 IC with a small value potentioeter for a starve control since those chips can behave quite funnilly at different voltages. '
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 Dirtbox Layouts. No KiCad fragment has been drawn for this circuit yet.
Parts list 26 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 8 | ||||
| ×11 | 56K | 56k | read from the layout by eye | |
| ×4 | 1M | 1M | read from the layout by eye | |
| ×3 | 10K | 10k | read from the layout by eye | |
| ×1 | 330Ω | 330 | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 150K | 150k | read from the layout by eye | |
| Capacitors 7 | ||||
| ×2 | 47nF | 47n | read from the layout by eye | |
| ×2 | 10nF | 10n | read from the layout by eye | |
| ×2 | 1nF | 1n | read from the layout by eye | |
| ×1 | 330pF | 330p | read from the layout by eye | |
| ×2 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×2 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×2 | 1N4148 | 1N4148 | D1, D2; legend: 1N4148/1N914; read from the layout by eye | |
| D3 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | 2N3904 | 2N3904 | read from the layout by eye | |
| Q2 | 2N3904 | 2N3904 | read from the layout by eye | |
| Q3 | 2N3904 | 2N3904 | read from the layout by eye | |
| ICs 2 | ||||
| IC1 | RC4558 | RC4558 | read from the layout by eye | |
| IC2 | CD4013 | CD4013 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Blend | B100K | B100k | Potentiometer | read from the layout by eye |
| Output | B100K | B100k | Potentiometer | read from the layout by eye |
| Switches 2 | ||||
| Octave | SPDT on/on | SPDT ON/ON | toggle; read from the layout by eye | |
| Treble Boost | SPDT on/on | SPDT ON/ON | toggle; read from the layout by eye | |
Other boards based on the MXR Blue Box
- MXR Blue Box Dirtbox Layouts
- Blue Fool - MXR Blue Box+ Fuzz Dog · 1590B · £31.20
- Blue Box Octave Fuzz PCBWay: Glory to Ukraine
- Mantle Fuzz PedalPCB · 125B · $8.00
- MXR Blue Box Tagboard Effects
- MXR Blue Box Tonepad · $11.00