1590B · 3 knobs
Jen Harmon BoosterVerified
Based on the Jen Harmon Booster· 5 other boards clone it
From the post
Not sure what to call this. It has "Booster" written on the original unit, but still i think it's rather closer to an overdrive than a booster. It's definitely not a fuzz. Either way, it does sound pretty nice in the demos. There are other layouts for this circuit around the internets, but i thought i'd be cool to have one that's 1590B friendly. As usual, i've added polarity protection and a filter cap (220µ), to make yours per original, just omit those accordingly. Transistors were BC318C in the original, but i think our closest modern day analogy would be BC549C. Before anyone asks, Input goes to Gain pot's lug number 3.
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 Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.
Parts list 24 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 12 | ||||
| ×5 | 22K | 22k | read from the layout by eye | |
| ×4 | 1M | 1M | read from the layout by eye | |
| ×4 | 10K | 10k | read from the layout by eye | |
| ×2 | 33K | 33k | read from the layout by eye | |
| ×1 | 560K | 560k | read from the layout by eye | |
| ×1 | 27K | 27k | read from the layout by eye | |
| ×1 | 3.3K | 3.3k | 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 | |
| ×1 | 220K | 220k | 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 | 220uF | 220u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N5817 | 1N5817 | added polarity protection; read from the layout by eye | |
| Transistors 1 | ||||
| ×7 | BC318C | BC318C | Q1-Q7; try BC549C or similar; read from the layout by eye | |
| Potentiometers 3 | ||||
| Gain | B100K | B100k | Potentiometer | read from the layout by eye |
| Tone | B100K | B100k | Potentiometer | read from the layout by eye |
| Volume | B100K | B100k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×1 | 5K | 5k | read from the layout by eye | |
Other boards based on the Jen Harmon Booster
- Jen Harmon Booster Dirtbox Layouts
- Jen Harmon Booster Effects Layouts (blog)
- Jen Harmon Fuzz Dog · 1590B · £38.40
- Jen (Gretsch Playboy) Harmon Booster Revolution Deux
- Jen (Gretsch Playboy) Harmon Booster turretboard.org