Enclosure not stated · 4 knobs

BB Preamp

Based on the Xotic BB Preamp· 9 other boards clone it

Schematic

The schematic image is on the project page. Open it at PCBWay.

Ref	Value	Normalized	Type	Notes
Resistors 11
×1	1M	1M		read from the schematic by eye
×5	1k	1k		read from the schematic by eye
×9	10k	10k		read from the schematic by eye
×2	470k	470k		read from the schematic by eye
×4	4k7	4.7k		read from the schematic by eye
×2	47k	47k		read from the schematic by eye
×1	220	220		read from the schematic by eye
×1	18k	18k		read from the schematic by eye
×1	33k	33k		read from the schematic by eye
×1	470	470		read from the schematic by eye
×1	100k	100k		read from the schematic by eye
Capacitors 10
×1	22n	22n		read from the schematic by eye
×2	1u	1u		read from the schematic by eye
×1	47n	47n		read from the schematic by eye
×1	47p	47p		read from the schematic by eye
×2	220n	220n		read from the schematic by eye
×3	100n	100n		read from the schematic by eye
×1	150p	150p		read from the schematic by eye
×2	33n	33n		read from the schematic by eye
×2	4n7	4.7n		read from the schematic by eye
×4	10u	10u		read from the schematic by eye
Diodes 2
×2	1N914	1N914		read from the schematic by eye
×1	1N5817	1N5817		read from the schematic by eye
Transistors 1
×2	2SC1815	2SC1815		read from the schematic by eye
ICs 1
×2	4558	4558		four op-amp sections drawn = two dual chips; read from the schematic by eye
Potentiometers 4
Gain	B1M	B1M	Potentiometer	read from the schematic by eye
Volume	B100k	B100k	Potentiometer	dual-gang: section A (pins 1-3) sets output level, section B (pins 4-6, wired as variable resistor) sets gain of the boost stage; read from the schematic by eye
Bass	B50k	B50k	Potentiometer	read from the schematic by eye
Treble	B50k	B50k	Potentiometer	read from the schematic by eye