Enclosure not stated · 4 knobs

Pearl Chorus

Based on the Pearl Chorus

Category: Vibrato / Chorus· Chorus
Controls: Mix Balance · Tone · Depth · Speed
Price: see vendor
Tags: Chorus

Open the schematic at Experimentalists Anonymous

Schematic

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Parts list 123 rows

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Check before you build · 2 values the reader of this schematic was not sure of

R7: printed twice on the main board
R29/R30: which feedback branch each label belongs to

Ref	Value	Normalized	Type	Notes
Resistors 62
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	100K	100k		read from the schematic by eye
R5	10K	10k		read from the schematic by eye
R6	1M	1M		read from the schematic by eye
R7	10K	10k		IC1 input bias; read from the schematic by eye
R7	10K	10k		second R7 printed at the IC3 bias divider (with R18); designator clash on the drawing; read from the schematic by eye
R8	47K	47k		read from the schematic by eye
R9	100K	100k		read from the schematic by eye
R10	10K	10k		read from the schematic by eye
R11	10K	10k		read from the schematic by eye
R12	10K	10k		read from the schematic by eye
R13	10K	10k		read from the schematic by eye
R14	4.7K	4.7k		read from the schematic by eye
R15	100	100		read from the schematic by eye
R16	100K	100k		read from the schematic by eye
R18	12K	12k		read from the schematic by eye
R19	56K	56k		read from the schematic by eye
R20	22K	22k		read from the schematic by eye
R21	220K	220k		read from the schematic by eye
R22	10K	10k		read from the schematic by eye
R23	10K	10k		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	12K	12k		read from the schematic by eye
R28	10K	10k		read from the schematic by eye
R29	22K	22k		IC1 feedback; the resistor in series with C19 is unlabeled, R29/R30 labels could belong to either branch; read from the schematic by eye
R30	33K	33k		read from the schematic by eye
R31	10K	10k		read from the schematic by eye
R32	150K	150k		read from the schematic by eye
R33	10K	10k		read from the schematic by eye
R34	10K	10k		read from the schematic by eye
R35	100K	100k		read from the schematic by eye
R36	220K	220k		read from the schematic by eye
R37	47K	47k		read from the schematic by eye
R38	33K	33k		read from the schematic by eye
R39	47K	47k		read from the schematic by eye
R40	1K	1k		read from the schematic by eye
R41	220K	220k		read from the schematic by eye
R42	2.2K	2.2k		read from the schematic by eye
R43	10K	10k		read from the schematic by eye
R44	10K	10k		read from the schematic by eye
R45	220	220		read from the schematic by eye
R46	2.2K	2.2k		read from the schematic by eye
R47	3.3K	3.3k		read from the schematic by eye
R48	10K	10k		read from the schematic by eye
R49	56K	56k		read from the schematic by eye
SW-R1	1M	1M		switch board SW-1; read from the schematic by eye
SW-R2	100K	100k		switch board SW-1; read from the schematic by eye
SW-R3	2.2M	2.2M		switch board SW-1; read from the schematic by eye
SW-R4	2.2M	2.2M		switch board SW-1; read from the schematic by eye
SW-R5	100K	100k		switch board SW-1; read from the schematic by eye
SW-R6	100K	100k		switch board SW-1; read from the schematic by eye
SW-R7	100K	100k		switch board SW-1; read from the schematic by eye
SW-R8	10K	10k		switch board SW-1; read from the schematic by eye
SW-R9	4.7K	4.7k		switch board SW-1; read from the schematic by eye
SW-R10	10K	10k		switch board SW-1; read from the schematic by eye
SW-R11	1K	1k		switch board SW-1; read from the schematic by eye
SW-R12	2.2K	2.2k		switch board SW-1; read from the schematic by eye
SW-R14	10K	10k		switch board SW-1; read from the schematic by eye
Capacitors 37
C1	0.033uF	33n		read from the schematic by eye
C2	0.022uF	22n		read from the schematic by eye
C3	1uF	1u		50V non-polar; read from the schematic by eye
C4	0.0047uF	4.7n		read from the schematic by eye
C5	0.033uF	33n		read from the schematic by eye
C6	0.0022uF	2.2n		read from the schematic by eye
C7	0.0047uF	4.7n		read from the schematic by eye
C8	470pF	470p		ceramic; read from the schematic by eye
C9	1uF	1u		50V electrolytic; read from the schematic by eye
C10	1uF	1u		50V electrolytic; read from the schematic by eye
C11	220uF	220u		16V; read from the schematic by eye
C12	10uF	10u		16V; read from the schematic by eye
C13	1uF	1u		50V non-polar; read from the schematic by eye
C14	0.0022uF	2.2n		read from the schematic by eye
C15	0.0047uF	4.7n		read from the schematic by eye
C16	470pF	470p		ceramic; read from the schematic by eye
C17	1uF	1u		50V non-polar; read from the schematic by eye
C18	0.47uF	470n		50V electrolytic; read from the schematic by eye
C19	0.0039uF	3.9n		read from the schematic by eye
C20	200pF	200p		ceramic; read from the schematic by eye
C21	1uF	1u		50V non-polar; read from the schematic by eye
C22	100pF	100p		polystyrene; read from the schematic by eye
C23	1uF	1u		50V electrolytic; read from the schematic by eye
C24	0.1uF	100n		read from the schematic by eye
C25	10uF	10u		16V; read from the schematic by eye
C26	47uF	47u		10V; read from the schematic by eye
C27	47uF	47u		10V; read from the schematic by eye
C28	220uF	220u		16V; read from the schematic by eye
C29	4.7uF	4.7u		25V; read from the schematic by eye
SW-C1	0.01uF	10n		switch board SW-1; read from the schematic by eye
SW-C2	0.022uF	22n		switch board SW-1; read from the schematic by eye
SW-C4	1uF	1u		switch board SW-1, 50V non-polar; read from the schematic by eye
SW-C5	1uF	1u		switch board SW-1, 50V non-polar; read from the schematic by eye
SW-C6	10uF	10u		switch board SW-1, 16V; read from the schematic by eye
SW-C7	10uF	10u		switch board SW-1, 16V; read from the schematic by eye
SW-C8	1uF	1u		switch board SW-1, 50V; read from the schematic by eye
SW-C9	10uF	10u		switch board SW-1, 16V; read from the schematic by eye
Diodes 5
D1	1S1588	1S1588		read from the schematic by eye
D2	UZ-5.1B	UZ-5.1B		zener; read from the schematic by eye
SW-D1	1S1588	1S1588		switch board SW-1; read from the schematic by eye
SW-D2	1S1588	1S1588		switch board SW-1; read from the schematic by eye
SW-D4	MA522	MA522		lambda diode; read from the schematic by eye
Transistors 7
Q1	2SC2240GR	2SC2240GR		read from the schematic by eye
Q2	2SC2240GR	2SC2240GR		read from the schematic by eye
Q3	2SC2240GR	2SC2240GR		read from the schematic by eye
Q4	2SC1815Y	2SC1815Y		read from the schematic by eye
Q5	2SC1815Y	2SC1815Y		read from the schematic by eye
SW-Q1	2SC1815Y	2SC1815Y		switch board SW-1; read from the schematic by eye
SW-Q2	2SC1815Y	2SC1815Y		switch board SW-1; read from the schematic by eye
ICs 5
IC1	JRC4558DD	JRC4558DD		dual op amp; read from the schematic by eye
IC2	MN3207	MN3207		BBD; read from the schematic by eye
IC3	MN3102	MN3102		BBD clock; read from the schematic by eye
IC4	TL022CP	TL022CP		dual op amp; read from the schematic by eye
SW-IC1	MC14007UB	MC14007UB		CMOS pair/inverter, used as electronic bypass switch and flip-flop; read from the schematic by eye
Potentiometers 4
Mix Balance	B10K	B10k	Potentiometer	VR1; read from the schematic by eye
Tone	C100K	C100k	Potentiometer	VR2; read from the schematic by eye
Depth	B100K	B100k	Potentiometer	VR3; read from the schematic by eye
Speed	B100K	B100k	Potentiometer	VR4; read from the schematic by eye
Trimmers 2
AVR-1	B47K	47k		BBD bias trimmer; read from the schematic by eye
SW-AVR-1	B10K	10k		switch board SW-1; read from the schematic by eye
LEDs 1
SW-D3	LED	LED		red indicator; read from the schematic by eye