Enclosure not stated · 2 knobs
D*A*M GB-80 GreaseBox
Based on the D*A*M GB-80 GreaseBox· 2 other boards clone it
From the post
Here's the germanium version of D*A*M's GreaseBox fuzz. It's based on the Tone Bender Mk. III but without the tone control. Q1 and 2 form a darlington pair to amplify the signal, and Q3 provides the fuzziness. The original units are positive ground effects and use PNP germanium transistors. That is reflected in the perf side of the image below, but for the PCB, I laid it out for negative ground for those of you who (like me) have a bunch of NPN germaniums.
Schematic
This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Effects Layouts (blog). No KiCad fragment has been drawn for this circuit yet.
Parts list 16 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 5 | ||||
| ×1 | 3.3K | 3.3k | read from the layout by eye | |
| ×4 | 10K | 10k | read from the layout by eye | |
| ×1 | 20K | 20k | read from the layout by eye | |
| ×1 | 220K | 220k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| Capacitors 4 | ||||
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×1 | 15nF | 15n | read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| D1 | Germanium | GERMANIUM | type not given; legend: D1: Germanium; read from the layout by eye | |
| ×1 | 1N4001 | 1N4001 | printed 4001; read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | Germanium | GERMANIUM | type not given; legend: Q1-3: Germanium; read from the layout by eye | |
| Q2 | Germanium | GERMANIUM | type not given; legend: Q1-3: Germanium; read from the layout by eye | |
| Q3 | Germanium | GERMANIUM | type not given; legend: Q1-3: Germanium; read from the layout by eye | |
| Potentiometers 2 | ||||
| Sustain | A100K | A100k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
Other boards based on the D*A*M GB-80 GreaseBox
- DAM Grease Box 80 Dirtbox Layouts
- Grease Box GB80 PCBWay: Glory to Ukraine