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DISTORTIONHIGHLOWLEVEL

125B · 4 knobs

PedalPCB· PCB698

Samarium Distortion

Based on the Boss HM-3· 1 other board clones it

Category
Fuzz· OD / Distortion / Fuzz
Controls
Distortion · High · Low · Level
Price
$12.00in stock
Tags
125B, 125B 4-Knob (Type 1)
Buy the PCB at PedalPCB Build document12/16/25 Tayda drill template

From the vendor

Controls

• Distortion

• High

• Low

• Level

Specifications

• Designed for a 125B enclosure with top-mounted jacks

Documentation

Schematic

The schematic is in the vendor's build document, page 4. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 74 rows

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RefValueNormalizedTypeNotes
Resistors 32
R110K10kResistor, 1/4W
R21M1MResistor, 1/4W
R310K10kResistor, 1/4W
R44K74.7kResistor, 1/4W
R547K47kResistor, 1/4W
R6220R220Resistor, 1/4W
R7220R220Resistor, 1/4W
R810K10kResistor, 1/4W
R9220K220kResistor, 1/4W
R1022K22kResistor, 1/4W
R112K22.2kResistor, 1/4W
R1210K10kResistor, 1/4W
R135K65.6kResistor, 1/4W
R141M1MResistor, 1/4W
R153K33.3kResistor, 1/4W
R163K33.3kResistor, 1/4W
R17100K100kResistor, 1/4W
R18330R330Resistor, 1/4W
R1910K10kResistor, 1/4W
R20100K100kResistor, 1/4W
R211K1kResistor, 1/4W
R2210K10kResistor, 1/4W
R23100K100kResistor, 1/4W
R24330R330Resistor, 1/4W
R2510K10kResistor, 1/4W
R26100K100kResistor, 1/4W
R2710K10kResistor, 1/4W
R28100K100kResistor, 1/4W
R291K1kResistor, 1/4W
R1004K74.7kResistor, 1/4W* LED current limiting resistor
R10110K10kResistor, 1/4W
R10210K10kResistor, 1/4W
Capacitors 25
C147n47nFilm capacitor, 7.2 x 2.5mm
C26n86.8nFilm capacitor, 7.2 x 2.5mm
C347n47nFilm capacitor, 7.2 x 2.5mm
C447p47pCeramic capacitor
C510u10uElectrolytic capacitor, 5mm
C610n10nFilm capacitor, 7.2 x 2.5mm
C7100p100pCeramic capacitor
C847n47nFilm capacitor, 7.2 x 2.5mm
C91u1uElectrolytic capacitor, 5mm
C1010n10nFilm capacitor, 7.2 x 2.5mm
C1147n47nFilm capacitor, 7.2 x 2.5mm
C121u1uElectrolytic capacitor, 5mm
C1310n10nFilm capacitor, 7.2 x 2.5mm
C141u1uElectrolytic capacitor, 5mm
C14B470n470nFilm capacitor, 7.2 x 5.0mm
C1568n68nFilm capacitor, 7.2 x 2.5mm
C1639n39nFilm capacitor, 7.2 x 2.5mm
C178n28.2nFilm capacitor, 7.2 x 2.5mm
C1822n22nFilm capacitor, 7.2 x 2.5mm
C191n21.2nFilm capacitor, 7.2 x 2.5mm
C2010u10uElectrolytic capacitor, 5mm* May be incorrectly marked 1u
C211u1uElectrolytic capacitor, 5mm* May be incorrectly marked 10u
C2210u10uElectrolytic capacitor, 5mm
C100100u100uElectrolytic capacitor, 5mm
C101100u100uElectrolytic capacitor, 5mm
Diodes 6
D11N41481N4148Signal diode, DO-35
D21N41481N4148Signal diode, DO-35
D31N41481N4148Signal diode, DO-35
D41N41481N4148Signal diode, DO-35
D51N41481N4148Signal diode, DO-35
D1001N58171N5817Schottky diode, DO-41
Transistors 5
Q12N54572N5457JFET transistor, N-channel
Q22N39042N3904BJT transistor, NPN TO-92
Q32N39042N3904BJT transistor, NPN TO-92
Q42N39042N3904BJT transistor, NPN TO-92
Q52N39042N3904BJT transistor, NPN TO-92
ICs 2
IC1JRC4558JRC4558Dual op-amp, DIP8
IC2JRC4558JRC4558Dual op-amp, DIP8
Potentiometers 4
LEVELA50KA50k16mm right-angle PCB mount pot
DISTA50KA50k16mm right-angle PCB mount pot
LOWB10KB10k16mm right-angle PCB mount pot
HIGHB10KB10k16mm right-angle PCB mount pot

Other boards based on the Boss HM-3