Enclosure not stated · 3 knobs
Jen Harmon BoosterVerified
Based on the Jen Harmon Booster· 5 other boards clone it
From the post
Here's a really unique overdrive from the Italian manufacturer Jen from the late 70s. Think Tube Screamer meets Big Muff. It sort of reminds me of a DBA design (only more stable and not as over the top) with a whole mess of transistor stages pushing a BMP style tone stack. Originals used BC318c transistors, but others in the 400-500 hfe range can be used. Here's the schematic for reference.
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 23 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 1.6K in the bottom row between 56K and 1M: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×4 | 10K | 10k | read from the layout by eye | |
| ×2 | 33K | 33k | read from the layout by eye | |
| ×1 | 3.3K | 3.3k | read from the layout by eye | |
| ×4 | 1M | 1M | read from the layout by eye | |
| ×1 | 27K | 27k | read from the layout by eye | |
| ×1 | 560K | 560k | read from the layout by eye | |
| ×5 | 22K | 22k | read from the layout by eye | |
| ×1 | 56K | 56k | read from the layout by eye | |
| ×1 | 1.6K | 1.6k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 18K | 18k | read from the layout by eye | |
| Capacitors 6 | ||||
| ×5 | 100pF | 100p | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×1 | 3.9nF | 3.9n | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×8 | 100nF | 100n | read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N5817 | 1N5817 | printed 5817; read from the layout by eye | |
| Transistors 1 | ||||
| ×7 | BC318 | BC318 | Q1-7; read from the layout by eye | |
| Potentiometers 3 | ||||
| Gain | B100K | B100k | Potentiometer | printed 100K Lin; read from the layout by eye |
| Tone | B100K | B100k | Potentiometer | printed 100K Lin; read from the layout by eye |
| Volume | B100K | B100k | Potentiometer | printed 100K Lin; read from the layout by eye |
| Trimmers 1 | ||||
| ×1 | 5K | 5k | read from the layout by eye | |
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