1590B · 3 knobs
Corvus (Legacy)
Based on the Electro-Harmonix Op-Amp Big Muff Pi· 18 other boards clone it
- Category
- Fuzz· Distortion/Sustainer, Fuzz
- Difficulty
- Easy
- Price
- see vendor
From the vendor
Project description
The Corvus Fuzz is a clone of the 1977-1980 “op-amp” EHX Big Muff Pi, a redesign of the classic Big Muff circuit using op-amps instead of transistor gain stages. It was designed by Howard Davis, a notable EHX engineer who also invented the Memory Man delay and Electric Mistress flanger as well as the Deluxe Big Muff Pi.
The Corvus features the Tone Bypass switch from the second revision, and it has the option to use a modified tonestack as suggested by Analogguru on the Freestompboxes.org forum.
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 46 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 19 | ||||
| R1 | 56k | 56k | ||
| R2 | 330k | 330k | ||
| R3 | 10k | 10k | ||
| R4 | 47k | 47k | ||
| R5 | 560k | 560k | ||
| R6 | 62k | 62k | ||
| R7 | 47R | 47 | ||
| R8 | 8k2 | 8.2k | ||
| R9 | 470k | 470k | ||
| R10 | 5k6 | 5.6k | ||
| R11 | 1k2 | 1.2k | ||
| R12 | 47k | 47k | ||
| R13 | 47k | 47k | ||
| R14 | 100k | 100k | ||
| R15 | 47R | 47 | ||
| R16 | 220k | 220k | ||
| R17 | 220k | 220k | ||
| R18 | 820k | 820k | ||
| R19 | 1M | 1M | ||
| Capacitors 14 | ||||
| C1 | 150n | 150n | ||
| C2 | 10n | 10n | ||
| C3 | 4n7 | 4.7n | ||
| C4 | 10uF | 10u | elec | |
| C5 | 1uF | 1u | ||
| C6 | 330pF | 330p | ||
| C7 | 1uF | 1u | ||
| C8 | 100n | 100n | ||
| C9 | 120n | 120n | ||
| C10 | 150n | 150n | ||
| C11 | 100uF | 100u | elec | |
| C12 | 100n | 100n | ||
| C13 | 10uF | 10u | elec | |
| C14 | 220n | 220n | ||
| Diodes 7 | ||||
| D2 | 1N914 | 1N914 | ||
| D3 | 1N914 | 1N914 | ||
| D4 | 1N914 | 1N914 | ||
| D5 | 1N914 | 1N914 | ||
| D6 | 1N914 | 1N914 | ||
| D7 | 1N914 | 1N914 | ||
| D1 | 1N4002 | 1N4002 | ||
| ICs 2 | ||||
| IC1 | RC4558P | RC4558P | ||
| IC2 | LM741 | LM741 | ||
| Potentiometers 3 | ||||
| SUSTAIN | 10KB | B10k | Potentiometer | |
| VOLUME | 100KA | A100k | Potentiometer | |
| TONE | 10KB | B10k | Potentiometer | |
| LEDs 1 | ||||
| LED1 | into | INTO | ||
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