1590B
Halo (Legacy)
Based on the EHX Big Muff Pi· 4 other boards clone it
- Category
- Fuzz· Distortion / Sustainer, Fuzz
- Difficulty
- Easy
- Price
- see vendor
From the vendor
One of the most classic guitar effects of all time, its sound falls somewhere between a distortion effect and a fuzz with an incredibly long sustain.
There’s no shortage of PCB offerings for a Big Muff, but I’ve tried to make a board that could be used to build any variation or clone out there as well as incorporating a number of mod options. Here are a few of the features:
• Optional “Presence” or midrange control (more info at AMZ). If you choose not to use this control, the Tone pot has two possible orientations so you can still have a symmetrical control layout.
• Extra pads for clipping diodes, allowing you to easily use LEDs or just about anything else
• Choice between two different gain recovery/output stages: “classic” or JFET (like in the BJFE Fire Red Fuzz)
• Space for large 1uf film caps where appropriate, allowing you to build any historical variant of the BMP
Schematic
The schematic is in the vendor's build document, page 5. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 50 rows
Report a wrong parse| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 24 | ||||
| R2 | 3k3 | 3.3k | ||
| R18 | 39k | 39k | ||
| R3 | 82k | 82k | ||
| R19 | 39k | 39k | ||
| R4 | 390k | 390k | ||
| R20 | 390k | 390k | ||
| R5 | 820R | 820 | ||
| R21 | 100k | 100k | ||
| R6 | 22k | 22k | ||
| R22 | 12k | 12k | ||
| R7 | 1k | 1k | ||
| R23 | 2k7 | 2.7k | ||
| R8 | 8k2 | 8.2k | ||
| R24 | 100R | 100 | ||
| R10 | 390k | 390k | ||
| R11 | 150R | 150 | ||
| R12 | 12k | 12k | ||
| R13 | 8k2 | 8.2k | ||
| R14 | 82k | 82k | ||
| R15 | 390k | 390k | ||
| R16 | 820R | 820 | ||
| R17 | 22k | 22k | ||
| R9 | 100k | 100k | ||
| R101 | 2k | 2k | ||
| Capacitors 16 | ||||
| C1 | 100n | 100n | ||
| C3 | 100n | 100n | ||
| C4 | 100n | 100n | ||
| C5 | 560pF | 560p | ||
| C6 | 50n | 50n | ||
| C7 | 100n | 100n | ||
| C8 | 560pF | 560p | ||
| C9 | 50n | 50n | ||
| C10 | 4n | 4n | ||
| C11 | 10n | 10n | ||
| C12 | 100n | 100n | ||
| C13 | 100n | 100n | ||
| C14 | 100uF | 100u | ||
| C15 | 100n | 100n | ||
| C2 | 470pF | 470p | ||
| C101 | 10uF | 10u | ||
| Diodes 5 | ||||
| D1 | 1N914 | 1N914 | ||
| D2 | 1N914 | 1N914 | ||
| D3 | 1N914 | 1N914 | ||
| D4 | 1N914 | 1N914 | ||
| D5 | 1N4001 | 1N4001 | ||
| Transistors 4 | ||||
| Q1 | 2N5088 | 2N5088 | ||
| Q2 | 2N5088 | 2N5088 | ||
| Q3 | 2N5088 | 2N5088 | ||
| Q4 | 2N5088 | 2N5088 | ||
| LEDs 1 | ||||
| LED1 | into | INTO | ||
Other boards based on the EHX Big Muff Pi
- Halo Aion FX · 125B · $12.50
- BMP General Guitar Gadgets · $14.00
- BMP General Guitar Gadgets · $14.00
- Muffin Fuzz PedalPCB · 125B · $12.00