Enclosure not stated · 4 knobs
Xotic BB PreampVerified
Based on the Xotic BB Preamp· 9 other boards clone it
From the post
Got a request for the BB Preamp, but not the current version. The earlier version uses a dual-gang pot for the Level control and apparently more bass response. Like many of Xotic's offerings the BB owes a lot to the classic Tube Screamer. Schematic can be found here.
If you'd prefer to build the newer version without the dual-gang Level pot, you can use the same board. Just remove the 1µ capacitor and the 1k and 47k resistors in the bottom right side of the board and replace with a jumper like this:
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 32 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 1 value the reader of this layout was not sure of
- 19K next to the lower-right 1K under the TL072: printed clearly on both board and wiring diagram, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×1 | 47Ω | 47 | read from the layout by eye | |
| ×1 | 220Ω | 220 | read from the layout by eye | |
| ×5 | 1K | 1k | read from the layout by eye | |
| ×3 | 4.7K | 4.7k | read from the layout by eye | |
| ×9 | 10K | 10k | read from the layout by eye | |
| ×1 | 19K | 19k | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| ×2 | 47K | 47k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×2 | 470K | 470k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| Capacitors 11 | ||||
| ×1 | 51pF | 51p | read from the layout by eye | |
| ×1 | 150pF | 150p | read from the layout by eye | |
| ×2 | 4.7nF | 4.7n | read from the layout by eye | |
| ×1 | 22nF | 22n | read from the layout by eye | |
| ×2 | 33nF | 33n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×2 | 220nF | 220n | read from the layout by eye | |
| ×2 | 1uF | 1u | drawn as box film caps; read from the layout by eye | |
| ×3 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×1 | 1N5818 | 1N5818 | read from the layout by eye | |
| ×2 | 1N4148 | 1N4148 | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | 2SC1815 | 2SC1815 | read from the layout by eye | |
| Q2 | 2SC1815 | 2SC1815 | read from the layout by eye | |
| ICs 2 | ||||
| ×1 | JRC4558 | JRC4558 | read from the layout by eye | |
| ×1 | TL072 | TL072 | read from the layout by eye | |
| Potentiometers 4 | ||||
| Gain | B1M | B1M | Potentiometer | read from the layout by eye |
| Level | B100K | B100k | Potentiometer | dual; read from the layout by eye |
| Bass | B50K | B50k | Potentiometer | read from the layout by eye |
| Treble | B50K | B50k | Potentiometer | read from the layout by eye |
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