Akashic Guitar effects circuit lookup
VOLUMEGAINTONECONTOUR

125B · 4 knobs

PedalPCB· PCB711

Nine Ball Overdrive

Based on the Marshall JCM900 Overdrive Pedal

Category
Fuzz· OD / Distortion / Fuzz
Controls
Volume · Gain · Tone · Contour
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

• Contour

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 JCM900 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 61 rows

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RefValueNormalizedTypeNotes
Resistors 26
R12M22.2MResistor, 1/4W
R22M22.2MResistor, 1/4W
R34K74.7kResistor, 1/4W
R410K10kResistor, 1/4W
R54K74.7kResistor, 1/4W
R64K74.7kResistor, 1/4W
R710K10kResistor, 1/4W
R810K10kResistor, 1/4W
R91K1kResistor, 1/4W
R101K1kResistor, 1/4W
R114K74.7kResistor, 1/4W
R125K65.6kResistor, 1/4W
R1315K15kResistor, 1/4W
R14100K100kResistor, 1/4W
R15470K470kResistor, 1/4W
R1622K22kResistor, 1/4W
R1710K10kResistor, 1/4W
R1810K10kResistor, 1/4W
R19470K470kResistor, 1/4W
R20470K470kResistor, 1/4W
R211K1kResistor, 1/4W
R22470K470kResistor, 1/4W
R10022R22Resistor, 1/4W
R10110K10kResistor, 1/4W
R10210K10kResistor, 1/4W
CLR4K74.7kResistor, 1/4W* LED current limiting resistor
Capacitors 23
C122n22nFilm capacitor, 7.2 x 2.5mm
C21n1nFilm capacitor, 7.2 x 2.5mm
C310n10nFilm capacitor, 7.2 x 2.5mm
C433n33nFilm capacitor, 7.2 x 2.5mm
C52n72.7nFilm capacitor, 7.2 x 2.5mm
C6220n220nFilm capacitor, 7.2 x 5mm
C7220p220pCeramic capacitor
C8220n220nFilm capacitor, 7.2 x 5mm
C94n74.7nFilm capacitor, 7.2 x 2.5mm
C10220n220nFilm capacitor, 7.2 x 5mm
C11220n220nFilm capacitor, 7.2 x 5mm
C12220n220nFilm capacitor, 7.2 x 5mm
C13470n470nFilm capacitor, 7.2 x 5mm
C14100p100pCeramic capacitor
C151u1uElectrolytic capacitor, 5mm
C16100p100pCeramic capacitor
C171u1uElectrolytic capacitor, 5mm
C1847n47nFilm capacitor, 7.2 x 2.5mm
C19470n470nFilm capacitor, 7.2 x 5mm
C20470n470nFilm capacitor, 7.2 x 5mm
C100220u220uElectrolytic capacitor, 5mm
C101100u100uElectrolytic capacitor, 5mm
C102100n100nFilm capacitor, 7.2 x 2.5mm
Diodes 5
D11N41481N4148Signal diode, DO-35
D21N41481N4148Signal diode, DO-35
D31N41481N4148Signal diode, DO-35
D41N41481N4148Signal diode, DO-35
D1001N58171N5817Schottky diode, DO-41
ICs 3
IC1TL072TL072Dual op-amp, DIP8
IC2TL072TL072Dual op-amp, DIP8
IC3MC33178MC33178Dual op-amp, DIP8Link
Potentiometers 4
VOLUMEA100KA100k16mm right-angle PCB mount pot
GAINA100KA100k16mm right-angle PCB mount pot
TONEB10KB10k16mm right-angle PCB mount pot
CONTOURA10KA10k16mm right-angle PCB mount pot