Enclosure not stated · 3 knobs
Electro Harmonix IC Big Muff
Based on the Electro-Harmonix Op-Amp Big Muff Pi· 18 other boards clone it
- Category
- Fuzz· Fuzz and Fuzzy Noisemakers
- Price
- see vendor
- Tags
- Fuzz and Fuzzy Noisemakers
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 32 rows
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Check before you build · 1 value the reader of this schematic was not sure of
- 6.8k tone resistor: drawn small, reads 6.6k or 6.8k
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 14 | ||||
| ×1 | 56k | 56k | input; read from the schematic by eye | |
| ×1 | 330k | 330k | U1A feedback; read from the schematic by eye | |
| ×2 | 220k | 220k | bias divider; read from the schematic by eye | |
| ×5 | 47k | 47k | one in the 4558 input filter, one in series with Fuzz, two in the 741 output divider, one output pulldown; read from the schematic by eye | |
| ×1 | 10k | 10k | read from the schematic by eye | |
| ×1 | 560k | 560k | second 4558 stage feedback; read from the schematic by eye | |
| ×1 | 62k | 62k | read from the schematic by eye | |
| ×1 | 82k | 82k | 741 input; read from the schematic by eye | |
| ×1 | 470k | 470k | 741 feedback; read from the schematic by eye | |
| ×1 | 820k | 820k | 741 bias; read from the schematic by eye | |
| ×1 | 1M | 1M | 741 bias; read from the schematic by eye | |
| ×1 | 6.8k | 6.8k | tone; drawn like 6.6k; read from the schematic by eye | |
| ×1 | 1.2k | 1.2k | tone; read from the schematic by eye | |
| ×1 | 100k | 100k | output pulldown; read from the schematic by eye | |
| Capacitors 11 | ||||
| ×1 | .068uF | 68n | input; read from the schematic by eye | |
| ×1 | 220uF | 220u | electrolytic, supply; read from the schematic by eye | |
| ×3 | 1uF | 1u | electrolytic: bias bypass, coupling to 741, tone; read from the schematic by eye | |
| ×1 | .0047uF | 4.7n | second stage feedback; read from the schematic by eye | |
| ×1 | .01uF | 10n | filter to ground; read from the schematic by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the schematic by eye | |
| ×1 | 150pF | 150p | 741 feedback; read from the schematic by eye | |
| ×2 | 0.22uF | 220n | 741 output coupling and bias bypass; read from the schematic by eye | |
| ×1 | 0.1uF | 100n | tone; read from the schematic by eye | |
| ×1 | 0.12uF | 120n | tone; read from the schematic by eye | |
| ×1 | 4.7uF | 4.7u | electrolytic, output; read from the schematic by eye | |
| Diodes 1 | ||||
| ×6 | 1N4148 | 1N4148 | two antiparallel strings of three in the 741 feedback; read from the schematic by eye | |
| ICs 2 | ||||
| ×1 | 4558 | 4558 | dual op amp, both sections used; read from the schematic by eye | |
| ×1 | 741 | 741 | read from the schematic by eye | |
| Potentiometers 3 | ||||
| Fuzz | 10k | 10k | Potentiometer | read from the schematic by eye |
| Tone | 10k | 10k | Potentiometer | read from the schematic by eye |
| Volume | 25k | 25k | Potentiometer | read from the schematic by eye |
| Switches 1 | ||||
| Tone Bypass | SPDT | SPDT | selects tone stack or bypass; read from the schematic by eye | |
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