Enclosure not stated · 4 knobs

BOSS XT-2

Based on the Boss XT-2

Category: Distortion· Distortion Boost and Overdrive
Controls: Distortion · Punch · Contour · Level
Price: see vendor
Tags: Distortion Boost and Overdrive

Open the schematic at Experimentalists Anonymous

Schematic

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Parts list 115 rows

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

R32 and R40: drawn 7.9k (nonstandard; probably 7.5k or 8.2k in the real unit)

Ref	Value	Normalized	Type	Notes
Resistors 53
R1	?	?		no value given; power supply; read from the schematic by eye
R2	?	?		no value given; 4V divider; read from the schematic by eye
R3	10k	10k		read from the schematic by eye
R4	?	?		no value given; read from the schematic by eye
R5	4.7k	4.7k		read from the schematic by eye
PS-R5	?	?		designator R5 printed twice; this is the 4V divider resistor, no value given; read from the schematic by eye
R6	?	?		no value given; bias; read from the schematic by eye
R7	?	?		no value given; read from the schematic by eye
R8	?	?		no value given; read from the schematic by eye
R9	?	?		no value given; read from the schematic by eye
R10	?	?		no value given; bias; read from the schematic by eye
R12	?	?		no value given; bias; read from the schematic by eye
R13	1M	1M		read from the schematic by eye
R14	10k	10k		read from the schematic by eye
R16	220k	220k		read from the schematic by eye
R17	10k	10k		read from the schematic by eye
R18	10k	10k		read from the schematic by eye
R19	270	270		read from the schematic by eye
R20	18k	18k		read from the schematic by eye
R21	10k	10k		read from the schematic by eye
R22	18k	18k		read from the schematic by eye
R23	100	100		read from the schematic by eye
R24	33k	33k		read from the schematic by eye
R25	1k	1k		read from the schematic by eye
R26	33k	33k		read from the schematic by eye
R28	47k	47k		read from the schematic by eye
R29	?	?		no value given; LED resistor; read from the schematic by eye
R30	2k	2k		read from the schematic by eye
R31	100k	100k		read from the schematic by eye
R32	7.9k	7.9k		read from the schematic by eye
R33	3.3k	3.3k		read from the schematic by eye
R34	470	470		read from the schematic by eye
R35	470k	470k		read from the schematic by eye
R36	10k	10k		read from the schematic by eye
R37	?	?		no value given; read from the schematic by eye
R38	330k	330k		read from the schematic by eye
R39	2.7k	2.7k		read from the schematic by eye
R40	7.9k	7.9k		read from the schematic by eye
R41	470k	470k		read from the schematic by eye
R42	100k	100k		read from the schematic by eye
R43	3.9k	3.9k		read from the schematic by eye
R44	?	?		no value given; switching flip-flop; read from the schematic by eye
R45	?	?		no value given; read from the schematic by eye
R46	?	?		no value given; read from the schematic by eye
R47	?	?		no value given; read from the schematic by eye
R48	?	?		no value given; read from the schematic by eye
R49	?	?		no value given; read from the schematic by eye
R50	?	?		no value given; read from the schematic by eye
R51	?	?		no value given; read from the schematic by eye
R52	10k	10k		read from the schematic by eye
R53	3.9k	3.9k		read from the schematic by eye
R54	?	?		no value given; read from the schematic by eye
R55	?	?		no value given; read from the schematic by eye
Capacitors 37
C2	?	?		electrolytic, no value given; supply; read from the schematic by eye
C3	?	?		electrolytic, no value given; read from the schematic by eye
PS-C3	?	?		designator C3 printed twice; this is the 4V bias electrolytic, no value given; read from the schematic by eye
C4	1u	1u		electrolytic; read from the schematic by eye
C5	?	?		electrolytic, no value given; read from the schematic by eye
C6	?	?		electrolytic, no value given; read from the schematic by eye
C7	1u	1u		electrolytic; read from the schematic by eye
C8	47n	47n		read from the schematic by eye
C10	1u	1u		electrolytic; read from the schematic by eye
C11	4.7u	4.7u		electrolytic; read from the schematic by eye
C12	470pF	470p		drawn '470'; read from the schematic by eye
C13	22pF	22p		drawn '22'; read from the schematic by eye
C14	5.6n	5.6n		read from the schematic by eye
C15	1u	1u		electrolytic; read from the schematic by eye
C16	0.1u	100n		tantalum; read from the schematic by eye
C17	10n	10n		read from the schematic by eye
C18	0.1u	100n		tantalum; read from the schematic by eye
C19	22n	22n		read from the schematic by eye
C20	1n	1n		read from the schematic by eye
C21	33n	33n		read from the schematic by eye
C22	330pF	330p		drawn '330'; read from the schematic by eye
C23	56n	56n		read from the schematic by eye
C24	3.3n	3.3n		read from the schematic by eye
C25	1u	1u		electrolytic; read from the schematic by eye
C26	47pF	47p		drawn '47'; read from the schematic by eye
C27	22n	22n		read from the schematic by eye
C28	1.2n	1.2n		read from the schematic by eye
C29	3.9n	3.9n		read from the schematic by eye
C30	220pF	220p		drawn '220'; read from the schematic by eye
C31	?	?		no value given; read from the schematic by eye
C33	?	?		no value given; read from the schematic by eye
C34	?	?		no value given; read from the schematic by eye
C35	?	?		no value given; read from the schematic by eye
C36	?	?		no value given; read from the schematic by eye
C37	68n	68n		read from the schematic by eye
C38	0.68u	680n		tantalum; read from the schematic by eye
C39	?	?		no value given; read from the schematic by eye
Diodes 6
D1	Diode	DIODE		no part number given; to Q1 gate; read from the schematic by eye
D1-2	Diode	DIODE		designator D1 printed twice; this one at Q3 JFET gate (right), no part number given; read from the schematic by eye
D2	Diode	DIODE		no part number given; to Q4 gate; read from the schematic by eye
D3	Zener	ZENER		zener in LED string, no part number given; read from the schematic by eye
D5	Diode	DIODE		no part number given; supply protection; read from the schematic by eye
×2	Diode	DIODE		clipping pair to ground after R30, no designator, no part number given (drawn with bent bars, may be zeners); read from the schematic by eye
Transistors 11
Q1	?	?		JFET bypass switch, no part number; read from the schematic by eye
PS-Q1	?	?		designator Q1 printed twice; this is the 8V supply pass transistor, no part number; read from the schematic by eye
Q2	?	?		JFET input buffer, no part number; read from the schematic by eye
Q3	?	?		NPN emitter follower, no part number; read from the schematic by eye
Q3-2	?	?		designator Q3 printed twice; this is the JFET bypass switch at right, no part number; read from the schematic by eye
Q4	?	?		JFET switch, no part number; read from the schematic by eye
Q5	?	?		NPN output buffer, no part number; read from the schematic by eye
Q8	?	?		BJT, no part number; read from the schematic by eye
Q9	?	?		NPN, switching flip-flop, no part number; read from the schematic by eye
Q10	?	?		NPN, switching flip-flop, no part number; read from the schematic by eye
Q11	?	?		NPN, no part number; read from the schematic by eye
ICs 3
IC1	?	?		dual op amp (IC1.1, IC1.2), no part number; read from the schematic by eye
IC2	?	?		dual op amp (IC2.1, IC2.2), no part number; read from the schematic by eye
IC3	?	?		dual op amp (IC3 and the unlabeled op amp at R43/C30), no part number; read from the schematic by eye
Potentiometers 4
Distortion	50kA	A50k	Potentiometer	VR1; read from the schematic by eye
Punch	10kC	C10k	Potentiometer	VR2; read from the schematic by eye
Contour	100k	100k	Potentiometer	VR3; read from the schematic by eye
Level	100k	100k	Potentiometer	VR4; read from the schematic by eye
LEDs 1
LED2	LED	LED		effect-on indicator; read from the schematic by eye