Enclosure not stated · 4 knobs

BOSS OS-2

Based on the Boss OS-2· 2 other boards clone it

Category: Distortion· Distortion Boost and Overdrive
Controls: Level · Tone · Drive · Color
Price: see vendor
Tags: Distortion Boost and Overdrive

Open the schematic at Experimentalists Anonymous

Schematic

The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.

Parts list 113 rows

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

R29: drawn 4M1, an unusual value (possibly 4M7)
C15: printed twice; the second (across VR3b) likely should be C14, which is otherwise missing

Ref	Value	Normalized	Type	Notes
Resistors 52
R1	4k7	4.7k		read from the schematic by eye
R2	20k	20k		read from the schematic by eye
R3	150k	150k		read from the schematic by eye
R4	33k	33k		read from the schematic by eye
R5	100k	100k		read from the schematic by eye
R6	10k	10k		read from the schematic by eye
R7	10k	10k		read from the schematic by eye
R8	10k	10k		read from the schematic by eye
R9	10k	10k		read from the schematic by eye
R10	1M	1M		read from the schematic by eye
R11	100k	100k		read from the schematic by eye
R12	1k	1k		read from the schematic by eye
R13	20k	20k		read from the schematic by eye
R14	22k	22k		read from the schematic by eye
R15	10k	10k		read from the schematic by eye
R16	1M	1M		read from the schematic by eye
R17	100R	100		circled revision-2 change; read from the schematic by eye
R18	1k2	1.2k		read from the schematic by eye
R19	470k	470k		read from the schematic by eye
R20	1M	1M		read from the schematic by eye
R21	10k	10k		read from the schematic by eye
R22	12k	12k		read from the schematic by eye
R23	1k	1k		read from the schematic by eye
R24	2k2	2.2k		read from the schematic by eye
R25	12k	12k		read from the schematic by eye
R26	8k2	8.2k		read from the schematic by eye
R27	6k8	6.8k		read from the schematic by eye
R28	10k	10k		read from the schematic by eye
R29	4M1	4.1M		drawn 4M1 (likely meant 4M7); circled revision-2 change; read from the schematic by eye
R30	100R	100		read from the schematic by eye
R31	1k2	1.2k		read from the schematic by eye
R32	6k8	6.8k		read from the schematic by eye
R33	1M	1M		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	1k	1k		read from the schematic by eye
R38	10k	10k		read from the schematic by eye
R39	100R	100		read from the schematic by eye
R40	1M	1M		read from the schematic by eye
R41	1M	1M		read from the schematic by eye
R42	56k	56k		read from the schematic by eye
R43	1M	1M		circled revision-2 change; read from the schematic by eye
R44	100k	100k		read from the schematic by eye
R45	1M	1M		read from the schematic by eye
R46	100k	100k		read from the schematic by eye
R47	1M	1M		read from the schematic by eye
R48	100k	100k		read from the schematic by eye
R49	100k	100k		read from the schematic by eye
R50	56k	56k		read from the schematic by eye
R51	56k	56k		read from the schematic by eye
R52	56k	56k		read from the schematic by eye
Capacitors 35
C1	10n	10n		read from the schematic by eye
C2	100uF	100u		16V; read from the schematic by eye
C3	100uF	100u		16V; read from the schematic by eye
C4	10n	10n		read from the schematic by eye
C5	10uF	10u		16V; read from the schematic by eye
C6	1n	1n		read from the schematic by eye
C7	10uF	10u		16V; read from the schematic by eye
C8	820p	820p		circled revision-2 change; read from the schematic by eye
C9	10uF	10u		16V; read from the schematic by eye
C10	1uF	1u		50V; read from the schematic by eye
C11	1uF	1u		50V; read from the schematic by eye
C12	1uF	1u		50V; read from the schematic by eye
C13	47n	47n		read from the schematic by eye
C15	10uF	10u		16V; read from the schematic by eye
×1	10uF	10u		16V; second capacitor also labeled C15 (designator clash, C14 is unused - probably C14); across Drive pot VR3b, circled revision-2 change; read from the schematic by eye
C16	18n	18n		read from the schematic by eye
C17	100p	100p		read from the schematic by eye
C18	0.47uF	470n		50V; read from the schematic by eye
C19	2.2uF	2.2u		50V; read from the schematic by eye
C20	100n	100n		circled revision-2 change; read from the schematic by eye
C21	220p	220p		read from the schematic by eye
C22	47n	47n		read from the schematic by eye
C23	4.7uF	4.7u		50V; read from the schematic by eye
C24	1uF	1u		50V; read from the schematic by eye
C25	1uF	1u		50V; read from the schematic by eye
C26	100p	100p		read from the schematic by eye
C27	47n	47n		read from the schematic by eye
C28	22n	22n		read from the schematic by eye
C29	10n	10n		circled revision-2 change; read from the schematic by eye
C30	1uF	1u		50V; read from the schematic by eye
C31	47n	47n		circled revision-2 change; read from the schematic by eye
C32	470p	470p		read from the schematic by eye
C33	470p	470p		read from the schematic by eye
C34	220p	220p		read from the schematic by eye
C35	47uF	47u		50V; read from the schematic by eye
Diodes 10
D1	Diode	DIODE		no part number given; read from the schematic by eye
D2	Diode	DIODE		no part number given; read from the schematic by eye
D3	Diode	DIODE		no part number given; read from the schematic by eye
D4	Diode	DIODE		no part number given; read from the schematic by eye
D5	5.6V Zener	5V6		zener, no part number given; read from the schematic by eye
D6	Diode	DIODE		no part number given; read from the schematic by eye
D7	Diode	DIODE		no part number given; read from the schematic by eye
D8	Diode	DIODE		no part number given; read from the schematic by eye
D9	Diode	DIODE		no part number given; read from the schematic by eye
D10	Diode	DIODE		no part number given; read from the schematic by eye
Transistors 9
Q1	?	?		N-channel JFET, no part number given; read from the schematic by eye
Q2	?	?		NPN, no part number given; read from the schematic by eye
Q3	?	?		NPN, no part number given; read from the schematic by eye
Q4	?	?		N-channel JFET, no part number given; read from the schematic by eye
Q5	?	?		NPN, no part number given; read from the schematic by eye
Q6	?	?		N-channel JFET, no part number given; read from the schematic by eye
Q7	?	?		N-channel JFET, no part number given; read from the schematic by eye
Q8	?	?		NPN, no part number given; read from the schematic by eye
Q9	?	?		NPN, no part number given; read from the schematic by eye
ICs 2
IC1	?	?		dual op amp, no part number given; read from the schematic by eye
IC2	?	?		dual op amp, no part number given; read from the schematic by eye
Potentiometers 4
Level	B50K	B50k	Potentiometer	VR1, 50k lin; read from the schematic by eye
Tone	20K	20k	Potentiometer	VR2; read from the schematic by eye
Drive	270K	270k	Potentiometer	VR3, dual-gang (VR3a/VR3b); read from the schematic by eye
Color	A20K	A20k	Potentiometer	VR4, 20k log; read from the schematic by eye
LEDs 1
D11	LED	LED		indicator; read from the schematic by eye

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