Enclosure not stated · 5 knobs
From the vendor
Aron Nelson's 2002 LM386 distortion (Rev B, from diystompboxes.com), shown in the post because some think the Black Magic is derived from it. The LM386's gain is set by a 5K Drive pot and 100 ohm resistor with a 47u cap between pins 8 and 1, and the output goes either through a plain coupling cap (Version A) or a passive Treble/Bass/Mid tone stack (Version B) to a 500K volume pot.
Simple Version A replaces the tone stack with a 100n film cap from pin 5 to the volume pot; Killer Version B uses the three-knob tone stack listed here.
Schematic
The schematic is in the post. Open it at Revolution Deux. No KiCad fragment has been drawn for this circuit yet.
Parts list 14 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 2 | ||||
| R1 | 100 | 100 | in series with the Drive pot; read from the schematic by eye | |
| R2 | 33K | 33k | tone stack; read from the schematic by eye | |
| Capacitors 6 | ||||
| C1 | 5n | 5n | input, film; read from the schematic by eye | |
| C2 | 47u | 47u | electrolytic, pins 8-1 gain; read from the schematic by eye | |
| C3 | 10u | 10u | electrolytic, pin 7 bypass; read from the schematic by eye | |
| C4 | 470p | 470p | ceramic, tone stack; read from the schematic by eye | |
| C5 | 22n | 22n | film, tone stack; read from the schematic by eye | |
| C6 | 22n | 22n | film, tone stack; read from the schematic by eye | |
| ICs 1 | ||||
| IC1 | LM386 | LM386 | read from the schematic by eye | |
| Potentiometers 5 | ||||
| Drive | 5K | 5k | Potentiometer | wired as a variable resistor; read from the schematic by eye |
| Treble | 250K | 250k | Potentiometer | read from the schematic by eye |
| Bass | 1M | 1M | Potentiometer | read from the schematic by eye |
| Mid | 25K | 25k | Potentiometer | read from the schematic by eye |
| Volume | 500K | 500k | Potentiometer | read from the schematic by eye |