PedalPCB Son of Ben Preamp User manual

Copyright © 2020 - PedalPCB.com Page 1 of 5Son of Ben Preamp
Son of Ben Preamp
Revised 12/31/20
All trademarks and registered trademarks are the property of their respective owners. The company, product, and service names used in this web site
are for identication purposes only. Use of these names, logos, and brands does not imply endorsement.
• Volume
• Drive
• Treble
• Bass
CONTROLS AND FEATURES

Copyright © 2020 - PedalPCB.com Page 2 of 5Son of Ben Preamp
Son of Ben Preamp
Parts List (Page 1 of 1)
LOCATION VALUE TYPE NOTES
R1 1M Resistor, 1/4W
R2 220K Resistor, 1/4W
R3 1M Resistor, 1/4W
R4 1K Resistor, 1/4W
R5 10K Resistor, 1/4W
R6 470K Resistor, 1/4W
R7 470K Resistor, 1/4W
R8 1K Resistor, 1/4W
R9 10K Resistor, 1/4W
R10 100K Resistor, 1/4W
R11 1K Resistor, 1/4W
R12 10K Resistor, 1/4W
R13 47K Resistor, 1/4W
R100 4K7 Resistor, 1/4W
C1 100n Film capacitor, 7.2 x 2.5mm
C2 22n Film capacitor, 7.2 x 2.5mm
C3 250p Ceramic capacitor
C4 470p Ceramic capacitor
C5 10u Electrolytic capacitor, 5mm
C6 22n Film capacitor, 7.2 x 2.5mm
C7 22n Film capacitor, 7.2 x 2.5mm
C8 22n Film capacitor, 7.2 x 2.5mm
C9 2n2 Film capacitor, 7.2 x 2.5mm
C10 10u Electrolytic capacitor, 5mm
C100 100u Electrolytic capacitor, 5mm
C101 100n Film capacitor, 7.2 x 2.5mm
D100 1N5817 Schottky diode, DO-41
Q1 J201 JFET transistor, N-channel *Alternate MMBFJ201 (SMD)
Q2 J201 JFET transistor, N-channel *Alternate MMBFJ201 (SMD)
Q3 J201 JFET transistor, N-channel *Alternate MMBFJ201 (SMD)
VOLUME A100K 16mm right-angle PCB mount pot
DRIVE A1M 16mm right-angle PCB mount pot
TREBLE A250K 16mm right-angle PCB mount pot
BASS B2M 16mm right-angle PCB mount pot
TRIM1 50K Trim potentiometer 3362P-style
TRIM2 50K Trim potentiometer 3362P-style
TRIM3 50K Trim potentiometer 3362P-style

Copyright © 2020 - PedalPCB.com Page 3 of 5Son of Ben Preamp
Son of Ben Preamp
Schematic Diagram
Adjust TRIM1 to 2KΩ Adjust TRIM2 for 4.0V on Drain of Q2 Adjust TRIM3 for 4.0V on Drain of Q3

Copyright © 2020 - PedalPCB.com Page 4 of 5Son of Ben Preamp
Son of Ben Preamp
Wiring Diagram

F
O
O
T
S
W
I
T
C
H
P
O
T
E
N
T
I
O
M
E
T
E
R
P
O
T
E
N
T
I
O
M
E
T
E
R
P
O
T
E
N
T
I
O
M
E
T
E
R
P
O
T
E
N
T
I
O
M
E
T
E
R
L
E
D
D
C
J
A
C
K
I
N
P
U
T
J
A
C
K
O
U
T
P
U
T
J
A
C
K
Copyright © 2020 - PedalPCB.com Page 5 of 5Son of Ben Preamp
Son of Ben Preamp
Drill Template
125B Enclosure
Treble Bass
Volume Drive