Enclosure not stated · 4 knobs

Pearl Compressor

Based on the Pearl Compressor

Category: Compressor· Compressors Gates and Limiters
Controls: Attack · Tone · Level · Sustain
Price: see vendor
Tags: Compressors Gates and Limiters

Open the schematic at Experimentalists Anonymous

Schematic

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Parts list 89 rows

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

SW-R4b: two resistors on the SW-1 board are both printed R4 (100K and 2.2M)
IC3: the attack-section op amps carry no label; TL022CP from the parts table

Ref	Value	Normalized	Type	Notes
Resistors 45
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
R5	10K	10k		read from the schematic by eye
R6	1K	1k		read from the schematic by eye
R7	47K	47k		read from the schematic by eye
R8	3.3K	3.3k		read from the schematic by eye
R9	10K	10k		read from the schematic by eye
R10	220	220		read from the schematic by eye
R11	100K	100k		read from the schematic by eye
R12	15K	15k		read from the schematic by eye
R13	2.2K	2.2k		read from the schematic by eye
R14	1K	1k		read from the schematic by eye
R15	2.2K	2.2k		read from the schematic by eye
R16	6.8K	6.8k		read from the schematic by eye
R17	22K	22k		read from the schematic by eye
R18	470	470		read from the schematic by eye
R19	100K	100k		read from the schematic by eye
R20	10K	10k		read from the schematic by eye
R21	10K	10k		read from the schematic by eye
R22	10K	10k		read from the schematic by eye
R23	1K	1k		read from the schematic by eye
R24	33K	33k		read from the schematic by eye
R25	6.8K	6.8k		read from the schematic by eye
R26	22K	22k		read from the schematic by eye
R27	10K	10k		read from the schematic by eye
R28	220K	220k		read from the schematic by eye
R29	1K	1k		read from the schematic by eye
R30	3.3K	3.3k		read from the schematic by eye
R31	220	220		read from the schematic by eye
R32	33K	33k		read from the schematic by eye
SW-R1	1M	1M		read from the schematic by eye
SW-R2	100K	100k		read from the schematic by eye
SW-R3	2.2M	2.2M		read from the schematic by eye
SW-R4	2.2M	2.2M		read from the schematic by eye
SW-R4b	100K	100k		printed R4 too (clash with the 2.2M R4); pulldown at N1; read from the schematic by eye
SW-R5	100K	100k		read from the schematic by eye
SW-R6	100K	100k		read from the schematic by eye
SW-R7	100K	100k		read from the schematic by eye
SW-R8	10K	10k		read from the schematic by eye
SW-R9	4.7K	4.7k		read from the schematic by eye
SW-R10	10K	10k		read from the schematic by eye
SW-R11	1K	1k		read from the schematic by eye
SW-R12	2.2K	2.2k		read from the schematic by eye
SW-R14	10K	10k		read from the schematic by eye
Capacitors 21
C1	0.033uF	33n		read from the schematic by eye
C2	1uF	1u		50V non-polar; read from the schematic by eye
C3	0.027uF	27n		read from the schematic by eye
C4	0.068uF	68n		read from the schematic by eye
C5	0.001uF	1n		read from the schematic by eye
C6	1uF	1u		50V; read from the schematic by eye
C7	1uF	1u		50V; read from the schematic by eye
C8	47uF	47u		10V; read from the schematic by eye
C9	10uF	10u		16V tantalum; read from the schematic by eye
C10	1uF	1u		50V non-polar; read from the schematic by eye
C11	1uF	1u		50V non-polar; read from the schematic by eye
C12	220uF	220u		16V; read from the schematic by eye
C13	47uF	47u		10V; read from the schematic by eye
SW-C1	0.01uF	10n		read from the schematic by eye
SW-C2	0.022uF	22n		read from the schematic by eye
SW-C4	1uF	1u		50V non-polar; read from the schematic by eye
SW-C5	1uF	1u		50V non-polar; read from the schematic by eye
SW-C6	10uF	10u		16V; read from the schematic by eye
SW-C7	10uF	10u		16V; read from the schematic by eye
SW-C8	1uF	1u		50V; read from the schematic by eye
SW-C9	10uF	10u		16V; read from the schematic by eye
Diodes 7
D1	1S1588	1S1588		read from the schematic by eye
D2	UZ-5.1B	UZ-5.1B		zener, bias; read from the schematic by eye
D3	1S1588	1S1588		read from the schematic by eye
D4	1S1588	1S1588		read from the schematic by eye
SW-D1	1S1588	1S1588		read from the schematic by eye
SW-D2	1S1588	1S1588		read from the schematic by eye
SW-D4	MA522	MA522		lambda diode; read from the schematic by eye
Transistors 5
Q1	2SC2240GR	2SC2240GR		read from the schematic by eye
Q2	2SK30A-GR	2SK30A-GR		JFET; read from the schematic by eye
Q3	2SA1015Y	2SA1015Y		read from the schematic by eye
SW-Q1	2SC1815Y	2SC1815Y		read from the schematic by eye
SW-Q2	2SC1815Y	2SC1815Y		read from the schematic by eye
ICs 4
IC1	JRC4558DD	JRC4558DD		read from the schematic by eye
IC2	CA3080	CA3080		OTA; read from the schematic by eye
IC3	TL022CP	TL022CP		dual op amp in the attack/envelope section; not labeled on the drawing, from the parts table; read from the schematic by eye
SW-IC1	MC14007UB	MC14007UB		CMOS pair/inverter used as flip-flop and analog switch; read from the schematic by eye
Potentiometers 4
Attack	C100K	C100k	Potentiometer	VR1; read from the schematic by eye
Tone	B10K	B10k	Potentiometer	VR2; read from the schematic by eye
Level	B50K	B50k	Potentiometer	VR3; read from the schematic by eye
Sustain	C200K	C200k	Potentiometer	VR4; read from the schematic by eye
Trimmers 2
AVR-1	B50K	50k		bias; read from the schematic by eye
SW-AVR-1	B10K	10k		LED brightness; read from the schematic by eye
LEDs 1
SW-D3	Red	RED		indicator; read from the schematic by eye