Akashic Guitar effects circuit lookup
VOLUMEGAINTONESENSITIVITY

125B · 4 knobs

PedalPCB· PCB704

Eight Ball Overdrive

Based on the Marshall JCM800· 1 other board clones it

Category
Fuzz· OD / Distortion / Fuzz
Controls
Volume · Gain · Tone · Sensitivity
Price
$12.00in stock
Tags
125B, 125B 4-Knob (Type 1)
Buy the PCB at PedalPCB Build document9/9/25 Tayda drill template

From the vendor

Controls

• Volume

• Gain

• Tone

• Sensitivity

Details

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

The company, product and service names used in this web site are for comparative purposes only. All trademarks and registered trademarks are the property of their respective owners. This product is not manufactured or distributed by Marshall Amplification, maker of the Marshall Amplification JCM800 Overdrive Pedal.

PedalPCB is in no way affiliated with Marshall Amplification.

Schematic

The schematic is in the vendor's build document, page 3. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 54 rows

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RefValueNormalizedTypeNotes
Resistors 23
R12M22.2MResistor, 1/4W
R22M22.2MResistor, 1/4W
R34K74.7kResistor, 1/4W
R410K10kResistor, 1/4W
R522K22kResistor, 1/4W
R6330R330Resistor, 1/4W
R710K10kResistor, 1/4W
R8470K470kResistor, 1/4W
R9100R100Resistor, 1/4W
R1010K10kResistor, 1/4W
R1122K22kResistor, 1/4W
R1222K22kResistor, 1/4W
R1347K47kResistor, 1/4W
R1447K47kResistor, 1/4W
R151M1MResistor, 1/4W
R16100K100kResistor, 1/4W
R17470K470kResistor, 1/4W
R181K1kResistor, 1/4W
R19470K470kResistor, 1/4W
R10022R22Resistor, 1/4W
R10110K10kResistor, 1/4W
R10210K10kResistor, 1/4W
CLR4K74.7kResistor, 1/4W* LED current limiting resistor
Capacitors 19
C122n22nFilm capacitor, 7.2 x 2.5mm
C21n1nFilm capacitor, 7.2 x 2.5mm
C3220n220nFilm capacitor, 7.2 x 5mm
C4220n220nFilm capacitor, 7.2 x 5mm
C568n68nFilm capacitor, 7.2 x 2.5mm
C61u1uElectrolytic capacitor, 5mm
C7100p100pCeramic capacitor
C8470n470nFilm capacitor, 7.2 x 5mm
C9220n220nFilm capacitor, 7.2 x 5mm
C101u1uElectrolytic capacitor, 5mm
C11150p150pCeramic capacitor
C121u1uElectrolytic capacitor, 5mm
C1368n68nFilm capacitor, 7.2 x 2.5mm
C14470n470nFilm capacitor, 7.2 x 5mm
C15470n470nFilm capacitor, 7.2 x 5mm
C100220u220uElectrolytic capacitor, 5mm
C101100n100nFilm capacitor, 7.2 x 2.5mm
C102100n100nFilm capacitor, 7.2 x 2.5mm
C103100u100uElectrolytic capacitor, 5mm
Diodes 5
D11N41481N4148Signal diode, DO-35
D21N41481N4148Signal diode, DO-35
D31N41481N4148Signal diode, DO-35
D41N41481N4148Signal diode, DO-35
D1001N58171N5817Schottky diode, DO-41
Transistors 1
Q12SK209G2SK209GJFET transistor, N-channel
ICs 2
IC1MC33178MC33178Dual op-amp, DIP8Link
IC2MC33178MC33178Dual op-amp, DIP8
Potentiometers 4
VOLUMEA100KA100k16mm right-angle PCB mount pot
GAINA25KA25k16mm right-angle PCB mount pot
TONEB10KB10k16mm right-angle PCB mount pot
SENSA1MA1M16mm right-angle PCB mount pot

Other boards based on the Marshall JCM800