Mastema Overdrive

From the vendor

Controls

• Level

• Tone

• Drive

• Hi/Low (Toggle switch)

Specifications

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

Documentation

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.

Ref	Value	Normalized	Type	Notes
Resistors 19
R1	931R	931	Resistor, 1/4W
R2	510K	510k	Resistor, 1/4W
R3	10K	10k	Resistor, 1/4W
R4	1K	1k	Resistor, 1/4W
R5	10K	10k	Resistor, 1/4W
R6	10K	10k	Resistor, 1/4W
R7	931R	931	Resistor, 1/4W
R8	160R	160	Resistor, 1/4W
R9	10K	10k	Resistor, 1/4W
R10	931R	931	Resistor, 1/4W
R11	931R	931	Resistor, 1/4W
R12	510K	510k	Resistor, 1/4W
R13	10K	10k	Resistor, 1/4W
R14	100R	100	Resistor, 1/4W
R15	10K	10k	Resistor, 1/4W
R16	1M	1M	Resistor, 1/4W
R100	7K87	7.87k	Resistor, 1/4W
R101	9K31	9.31k	Resistor, 1/4W
CLR	4K7	4.7k	Resistor, 1/4W	* LED current limiting resistor
Capacitors 11
C1	100n	100n	Film capacitor, 7.2 x 2.5mm
C2	220n	220n	Film capacitor, 7.2 x 5.0mm
C3	1u	1u	Film capacitor, 7.2 x 5.0mm
C4	51p	51p	Ceramic capacitor
C5	220n	220n	Film capacitor, 7.2 x 5.0mm
C6	220n	220n	Film capacitor, 7.2 x 5.0mm
C7	1u	1u	Film capacitor, 7.2 x 5.0mm
C8	100n	100n	Film capacitor, 7.2 x 2.5mm
C9	10u	10u	Electrolytic capacitor, 5mm
C100	100u	100u	Electrolytic capacitor, 5mm
C101	47u	47u	Electrolytic capacitor, 5mm
Diodes 6
D1	1N4148	1N4148	Signal diode, DO-35
D2	Red	RED	5mm Red LED, Diffused
D3	Red	RED	5mm Red LED, Diffused
D4	1N4148	1N4148	Signal diode, DO-35
D5	1N4148	1N4148	Signal diode, DO-35
D100	1N5817	1N5817	Schottky diode, DO-41
Transistors 2
Q1	BC549C	BC549C	BJT transistor, NPN TO-92
Q2	BC549C	BC549C	BJT transistor, NPN TO-92
ICs 1
IC1	JRC4558DD	JRC4558DD	Dual op-amp, DIP8
Potentiometers 3
LEVEL	A100K	A100k	16mm right-angle PCB mount pot
TONE	W20K	W20k	16mm right-angle PCB mount pot
DRIVE	A1M	A1M	16mm right-angle PCB mount pot
Switches 1
HI/LO	ON/OFF/ON	ON/OFF/ON	Toggle switch, SPDT	3-position (ON/OFF/ON)