Enclosure not stated · 3 knobs
Mad Professor Stone Grey Distortion
Based on the Mad Professor Stone Grey Distortion· 7 other boards clone it
- Category
- Distortion
- Controls
- Distortion · Tone · Volume
- Price
- see vendor
- Also as
- Vero layout · from Revolution Deux
- Tags
- freestompboxes.org trace
From the vendor
Mad Professor's high-gain Stone Grey Distortion, taken apart on freestompboxes.org and drawn by RoseBlood11. A TL051 op-amp gain stage, with two diode-connected 2N3819 JFETs in its feedback loop and a 1M Distortion pot, drives two CD4069UBE CMOS inverter stages into clipping (the post credits their MOSFET innards for the sound), followed by a simple tone control and volume.
Schematic
The schematic is in the post. Open it at Revolution Deux. No KiCad fragment has been drawn for this circuit yet.
Parts list 31 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| R1 | 4.7K | 4.7k | read from the schematic by eye | |
| R2 | 14.7K | 14.7k | read from the schematic by eye | |
| R3 | 470K | 470k | read from the schematic by eye | |
| R4 | 470K | 470k | read from the schematic by eye | |
| R5 | 200K | 200k | read from the schematic by eye | |
| R6 | 1M | 1M | read from the schematic by eye | |
| R7 | 1M | 1M | read from the schematic by eye | |
| R8 | 1M | 1M | read from the schematic by eye | |
| R9 | 1M | 1M | read from the schematic by eye | |
| R11 | 100 | 100 | power; read from the schematic by eye | |
| R12 | 10K | 10k | read from the schematic by eye | |
| Capacitors 12 | ||||
| C1 | 47n | 47n | read from the schematic by eye | |
| C2 | 47n | 47n | read from the schematic by eye | |
| C3 | 100p | 100p | read from the schematic by eye | |
| C4 | 100p | 100p | read from the schematic by eye | |
| C5 | 100p | 100p | read from the schematic by eye | |
| C6 | 15p | 15p | read from the schematic by eye | |
| C7 | 2.2n | 2.2n | read from the schematic by eye | |
| C8 | 100n | 100n | read from the schematic by eye | |
| C9 | 10n | 10n | read from the schematic by eye | |
| C10 | 100u | 100u | electrolytic, power filter; read from the schematic by eye | |
| C11 | 4.7u | 4.7u | electrolytic; read from the schematic by eye | |
| C12 | 22n | 22n | read from the schematic by eye | |
| Diodes 1 | ||||
| D2 | 1N4004 | 1N4004 | reverse polarity protection; read from the schematic by eye | |
| Transistors 2 | ||||
| Q1 | 2N3819 | 2N3819 | JFET, diode-connected in the feedback loop; read from the schematic by eye | |
| Q2 | 2N3819 | 2N3819 | JFET, diode-connected in the feedback loop; read from the schematic by eye | |
| ICs 2 | ||||
| U1 | TL051 | TL051 | read from the schematic by eye | |
| U2 | CD4069UBE | CD4069UBE | CMOS hex inverter; read from the schematic by eye | |
| Potentiometers 3 | ||||
| Distortion | A1M | A1M | Potentiometer | read from the schematic by eye |
| Tone | A50K | A50k | Potentiometer | read from the schematic by eye |
| Volume | A50K | A50k | Potentiometer | read from the schematic by eye |
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