Enclosure not stated · 4 knobs
Xotic BB PreampVerified
Based on the Xotic BB Preamp· 9 other boards clone it
From the post
I really love the sound of this one. I've seen two different diode arrangements, one with just two back to back which would be more compressed, and one with two series pairs, so I've included a switch so that you can choose either, and also have a centre diode lift mode for a cleanish boost. Info about the original:
The BB Preamp offers awide variety of sounds. It's capable of a 30dB+ clean boost with an adjustable ±15dB two band active EQ which adds a wide range of harmonic content to your ideal sound. The BB also utilizes a pre-gain stage which allows the Pedal to go from a very pristine clean to a very smooth,compressed, overdriven sound.
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 36 rows
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Check before you build · 2 values the reader of this layout was not sure of
- 19K at upper left between the 10K and a 1K: printed clearly, unusual value (could be meant as 15K)
- 151p beside the 2K2 at upper right: printed clearly, unusual value (probably 150p)
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 12 | ||||
| ×9 | 10K | 10k | read from the layout by eye | |
| ×4 | 1K | 1k | read from the layout by eye | |
| ×3 | 4K7 | 4.7k | read from the layout by eye | |
| ×2 | 470K | 470k | read from the layout by eye | |
| ×1 | 47R | 47 | read from the layout by eye | |
| ×1 | 220R | 220 | read from the layout by eye | |
| ×1 | 2K2 | 2.2k | read from the layout by eye | |
| ×1 | 19K | 19k | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| Capacitors 10 | ||||
| ×2 | 100n | 100n | read from the layout by eye | |
| ×2 | 220n | 220n | read from the layout by eye | |
| ×2 | 4n7 | 4.7n | read from the layout by eye | |
| ×2 | 33n | 33n | read from the layout by eye | |
| ×1 | 22n | 22n | read from the layout by eye | |
| ×1 | 47n | 47n | read from the layout by eye | |
| ×1 | 1u | 1u | read from the layout by eye | |
| ×1 | 51p | 51p | read from the layout by eye | |
| ×1 | 151p | 151p | read from the layout by eye | |
| ×4 | 10u | 10u | electrolytic; read from the layout by eye | |
| Diodes 6 | ||||
| D1 | 1N4148 | 1N4148 | on the switch; read from the layout by eye | |
| D2 | 1N4148 | 1N4148 | on the switch; read from the layout by eye | |
| D3 | 1N4148 | 1N4148 | on the switch; read from the layout by eye | |
| D4 | 1N4148 | 1N4148 | on the switch; read from the layout by eye | |
| D5 | 1N4148 | 1N4148 | on the switch; read from the layout by eye | |
| D6 | 1N4148 | 1N4148 | on the switch; 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 1 | ||||
| ×2 | JRC4558 | JRC4558 | JRC4558 or similar; two 8-pin ICs drawn; read from the layout by eye | |
| Potentiometers 4 | ||||
| Drive | 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 |
| Volume | B100K | B100k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Sw1 | DPDT on/off/on | DPDT ON/OFF/ON | clipping diode toggle; read from the layout by eye | |
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