GuitarPCB Guitar/Bass Driver v3 Manual

The Guitar/Bass Driver contains (9) transistors to deliver a larger-than-life tube-like tone found in old Ampeg™ style amps.
This circuit will make your Bass come alive and growl, but it also sounds amazing for your 6-string Guitar. It will deliver a natural-
sounding tube-style breakup as you turn the gain up full. If you enjoy turning your gain to 10, finding a sweet spot position is easy
using the volume and boost controls at 70-80% rotation, which will yield maximum drive with plenty of headroom.
Part Value
R1 2M
R2 1M
R3 47k
R4 1M
R5 1M
R6 22k
R7 200k
R8 4k7
R9 *22k
R10 100k
R11 1M
R12 1M
Build Notes on Modifications:
*R27 uses a value from 22k to 33k. 33k will start the rotation with the most amount of Boost /Enhancement.
22k will start attenuating very slightly. Any value between 22k and 33k will work absolutely fine.
*R30 – 1k8 is the CLR (current limiting resistor) for the Status LED. This is bright. Higher value will be dimmer.
*C1, C3 & C16 – 100n. These are coupling capacitors and can be raised to 220n if you want even more Bass.
Guitar/Bass Driver v3
Five Controls – Gain, Bass, Treble, Volume & Boost/Enhancement
Dimensions: 2.12' X 1.87"
Part Value
R13 2k
R14 100k
R15 4k7
R16 200k
R17 1M
R18 1M
R19 10k
R20 4k7
R21 10k
R22 10k
R23 100k
R24 100k
GuitarPCB.com
Part Value
R25 33k
R26 1M
R27 *22-33k
R28 1k
R29 47R
R30 *1k8
C1 *100n
C2 470n
C3 *100n
C4 47p
C5 1u
Part Value
C6 4u7
C7 1n
C8 4n7
C9 1n
C10 10n
C11 4u7
C12 4u7
C13 2n2 BOOST
C14 2n2 GAIN
C15 22u
C16 *100n Q1 - Q8
C17 100u
Part Value
TR1 20k
D1 1n4001
D2 Status LED
TREB A1M
VOL B100k
BASS A1M
A100k
A1M
2N5457
Q9 J113