Enclosure not stated · 4 knobs

Pearl Overdrive

Based on the Pearl Overdrive

Category: Overdrive· Distortion Boost and Overdrive
Controls: EQ Gain · Frequency · Out Level · Overdrive
Price: see vendor
Tags: Distortion Boost and Overdrive

Open the schematic at Experimentalists Anonymous

Schematic

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Parts list 90 rows

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Check before you build · 1 value the reader of this schematic was not sure of

SW-C8: 50/1 read as 50uF 1V, unusual voltage but clearly drawn

Ref	Value	Normalized	Type	Notes
Resistors 43
R1	1K	1k		read from the schematic by eye
R2	1M	1M		read from the schematic by eye
R3	10K	10k		read from the schematic by eye
R4	680K	680k		read from the schematic by eye
R5	270K	270k		read from the schematic by eye
R6	22K	22k		read from the schematic by eye
R7	22K	22k		read from the schematic by eye
R8	22K	22k		read from the schematic by eye
R9	3.3K	3.3k		read from the schematic by eye
R10	2.2K	2.2k		read from the schematic by eye
R11	2.2K	2.2k		read from the schematic by eye
R12	22K	22k		read from the schematic by eye
R13	22K	22k		read from the schematic by eye
R14	22K	22k		read from the schematic by eye
R15	22K	22k		read from the schematic by eye
R16	10K	10k		read from the schematic by eye
R17	10K	10k		read from the schematic by eye
R18	100K	100k		read from the schematic by eye
R19	10K	10k		read from the schematic by eye
R20	1M	1M		read from the schematic by eye
R21	1K	1k		read from the schematic by eye
R22	1K	1k		read from the schematic by eye
R23	1K	1k		read from the schematic by eye
R24	10K	10k		read from the schematic by eye
R25	10K	10k		read from the schematic by eye
R26	10K	10k		read from the schematic by eye
R27	4.7K	4.7k		read from the schematic by eye
R28	3.3K	3.3k		read from the schematic by eye
R29	220	220		read from the schematic by eye
R30	470	470		read from the schematic by eye
SW-R1	1M	1M		switching board SW-1; read from the schematic by eye
SW-R2	100K	100k		switching board SW-1; read from the schematic by eye
SW-R3	2.2M	2.2M		switching board SW-1; read from the schematic by eye
SW-R4	2.2M	2.2M		switching board SW-1; read from the schematic by eye
SW-R5	100K	100k		switching board SW-1; read from the schematic by eye
SW-R6	100K	100k		switching board SW-1; read from the schematic by eye
SW-R7	100K	100k		switching board SW-1; read from the schematic by eye
SW-R8	10K	10k		switching board SW-1; read from the schematic by eye
SW-R9	4.7K	4.7k		switching board SW-1; read from the schematic by eye
SW-R10	10K	10k		switching board SW-1; read from the schematic by eye
SW-R11	1K	1k		switching board SW-1; read from the schematic by eye
SW-R12	2.2K	2.2k		switching board SW-1; read from the schematic by eye
SW-R14	10K	10k		switching board SW-1; read from the schematic by eye
Capacitors 25
C1	0.033uF	33n		read from the schematic by eye
C2	1uF	1u		50V; read from the schematic by eye
C3	10uF	10u		16V; read from the schematic by eye
C4	1uF	1u		50V; read from the schematic by eye
C5	0.0047uF	4.7n		read from the schematic by eye
C6	0.068uF	68n		read from the schematic by eye
C7	0.1uF	100n		read from the schematic by eye
C8	470pF	470p		read from the schematic by eye
C9	0.1uF	100n		read from the schematic by eye
C10	0.22uF	220n		50V; read from the schematic by eye
C11	0.015uF	15n		read from the schematic by eye
C12	1uF	1u		50V; read from the schematic by eye
C13	1uF	1u		50V; read from the schematic by eye
C14	1uF	1u		50V; read from the schematic by eye
C15	47uF	47u		10V; read from the schematic by eye
C16	220uF	220u		16V; read from the schematic by eye
C17	100uF	100u		16V; read from the schematic by eye
SW-C1	0.01uF	10n		switching board SW-1; read from the schematic by eye
SW-C2	0.022uF	22n		switching board SW-1; read from the schematic by eye
SW-C4	1uF	1u		switching board SW-1; 50V non-polar; read from the schematic by eye
SW-C5	1uF	1u		switching board SW-1; 50V non-polar; read from the schematic by eye
SW-C6	10uF	10u		switching board SW-1; 16V; read from the schematic by eye
SW-C7	10uF	10u		switching board SW-1; 16V; read from the schematic by eye
SW-C8	50uF	50u		switching board SW-1; 1V; read from the schematic by eye
SW-C9	10uF	10u		switching board SW-1; 16V; read from the schematic by eye
Diodes 7
D1	1S1588	1S1588		reverse-polarity protection; read from the schematic by eye
D2	UZ-5.1B	UZ-5.1B		5.1V zener, bias; read from the schematic by eye
D3	1S1588	1S1588		clipping; read from the schematic by eye
D4	1S1588	1S1588		clipping; read from the schematic by eye
SW-D1	1S1588	1S1588		switching board SW-1; read from the schematic by eye
SW-D2	1S1588	1S1588		switching board SW-1; read from the schematic by eye
SW-D4	MA522	MA522		lambda diode, switching board SW-1; read from the schematic by eye
Transistors 6
Q1	2SC2240(GR)	2SC2240(GR)		read from the schematic by eye
Q2	2SC2240(GR)	2SC2240(GR)		read from the schematic by eye
Q3	2SC2240(GR)	2SC2240(GR)		read from the schematic by eye
Q4	2SC2240(GR)	2SC2240(GR)		read from the schematic by eye
SW-Q1	2SC1815(Y)	2SC1815(Y)		switching board SW-1; read from the schematic by eye
SW-Q2	2SC1815(Y)	2SC1815(Y)		switching board SW-1; read from the schematic by eye
ICs 3
IC1	JRC4558DD	JRC4558DD		read from the schematic by eye
IC2	JRC4558DD	JRC4558DD		read from the schematic by eye
SW-IC1	MC14007UB	MC14007UB		CMOS pair/inverter, used as FET flip-flop and two analog switches; switching board SW-1; read from the schematic by eye
Potentiometers 4
EQ Gain	B10K	B10k	Potentiometer	VR1; read from the schematic by eye
Frequency	C100K	C100k	Potentiometer	VR2, dual gang (100KC x2); read from the schematic by eye
Out Level	B10K	B10k	Potentiometer	VR3; read from the schematic by eye
Overdrive	B100K	B100k	Potentiometer	VR4; read from the schematic by eye
Trimmers 1
SW-VR1	B10K	10k		switching board SW-1, drawn AVR-1; read from the schematic by eye
LEDs 1
SW-D3	LED	LED		red indicator, switching board SW-1; read from the schematic by eye