Enclosure not stated · 4 knobs
Benson PreampVerified
Based on the Benson Preamp· 7 other boards clone it
From the post
Schematic and suggested trimput setup at PedalPCB.
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 Dirtbox Layouts. No KiCad fragment has been drawn for this circuit yet.
Parts list 21 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 250pF ceramic at column 5, rows K-L: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 7 | ||||
| ×3 | 10K | 10k | read from the layout by eye | |
| ×3 | 1K | 1k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×2 | 470K | 470k | read from the layout by eye | |
| ×1 | 220K | 220k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| Capacitors 7 | ||||
| ×1 | 250pF | 250p | read from the layout by eye | |
| ×1 | 470pF | 470p | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×4 | 22nF | 22n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 1 | ||||
| ×3 | J201 | J201 | JFET; Q1-Q3; read from the layout by eye | |
| Potentiometers 4 | ||||
| Drive | A1M | A1M | Potentiometer | read from the layout by eye |
| Bass | B2M | B2M | Potentiometer | read from the layout by eye |
| Treble | A250K | A250k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×3 | 50K | 50k | read from the layout by eye | |
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