Enclosure not stated · 2 knobs
Fulltone 2BVerified
Based on the Fulltone 2B· 3 other boards clone it
From the post
Happy 2022, everyone! Here's a buffer/booster from Fulltone. Engaged it's a booster with an interesting controllable germanium soft clipping setup, and when bypassed the diodes and gain control are shorted, creating a buffer. If you're just after the boost and want to skip the buffered bypass, just ignore the two Bypass pads and wire it normally. The original uses a 3PDT still for bypass, but you should be able to get away with a DPDT (just wire the bypass pads to lugs 1 and 2 of a DPDT, LED- to lug 4 and lug 5 to ground). Discussion and schematic over on FSB.
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 15 rows
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Check before you build · 1 value the reader of this layout was not sure of
- D1, D2: legend prints '1N750 or similar germanium' clearly, but 1N750 is normally a zener; possibly a typo for another germanium type
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 5 | ||||
| ×4 | 10K | 10k | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×2 | 3.3M | 3.3M | read from the layout by eye | |
| ×1 | 100Ω | 100 | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| Capacitors 4 | ||||
| ×1 | 100pF | 100p | read from the layout by eye | |
| ×1 | 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 3 | ||||
| D1 | 1N750 | 1N750 / 4V7 | or similar germanium; read from the layout by eye | |
| D2 | 1N750 | 1N750 / 4V7 | or similar germanium; read from the layout by eye | |
| ×1 | 1N5817 | 1N5817 | read from the layout by eye | |
| ICs 1 | ||||
| IC1 | AD711 | AD711 | or similar single opamp; read from the layout by eye | |
| Potentiometers 2 | ||||
| Gain | A100K | A100k | Potentiometer | read from the layout by eye |
| Dynamics | B250K | B250k | Potentiometer | read from the layout by eye |
Other boards based on the Fulltone 2B
- Fulltone 2B Dirtbox Layouts
- 2B PCBWay: Glory to Ukraine
- FDIC Boost PedalPCB · 125B · $12.00