Enclosure not stated · 4 knobs
Xotic BB Pre AmpVerified
Based on the Xotic BB Preamp· 9 other boards clone it
From the post
Two layouts for this one. One stock and one with an additional Mid control. The clipping diodes is placed on the side of the board so you can easily add a diode clipper switch. Just omit the diodes on the board and add wires tat pad 1M and 1N to a DPDT switch where you solder your diodes of choice. Stock layout
Layout with Mid control
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 34 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 19K at column 20, rows P-R (bottom right): printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×3 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| ×9 | 10K | 10k | read from the layout by eye | |
| ×1 | 47Ω | 47 | read from the layout by eye | |
| ×2 | 470K | 470k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×4 | 1K | 1k | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 220Ω | 220 | read from the layout by eye | |
| ×1 | 19K | 19k | read from the layout by eye | |
| Capacitors 12 | ||||
| ×1 | 47pF | 47p | 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 | |
| ×1 | 1uF | 1u | read from the layout by eye | |
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 3 | ||||
| D1 | 1N4148 | 1N4148 | read from the layout by eye | |
| D2 | 1N4148 | 1N4148 | read from the layout by eye | |
| D3 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | 2N5088 | 2N5088 | read from the layout by eye | |
| Q2 | 2N5088 | 2N5088 | read from the layout by eye | |
| ICs 2 | ||||
| IC1 | JRC4558D | JRC4558D | read from the layout by eye | |
| IC2 | TL072 | TL072 | read from the layout by eye | |
| Potentiometers 4 | ||||
| Gain | B1M | B1M | Potentiometer | 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 |
| Level | A100K | A100k | Potentiometer | read from the layout by eye |
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