Enclosure not stated · 2 knobs

BOSS SG1

Based on the Boss SG1

Category: Ring Mod / Synth· Guitar Synth and Misc Signal Shapers
Controls: Sens · Attack
Price: see vendor
Tags: Guitar Synth and Misc Signal Shapers

Open the schematic at Experimentalists Anonymous

Schematic

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Parts list 86 rows

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Check before you build · 4 values the reader of this schematic was not sure of

R36: value not legible
R24: designator partly legible
C9, C19: designators smudged, assigned by sequence
R6: 470K, could be 430K

Ref	Value	Normalized	Type	Notes
Resistors 39
R1	1K	1k		read from the schematic by eye
R2	470K	470k		read from the schematic by eye
R3	10K	10k		read from the schematic by eye
R4	470	470		read from the schematic by eye
R5	22K	22k		read from the schematic by eye
R6	470K	470k		could be 430K; read from the schematic by eye
R7	3.3K	3.3k		read from the schematic by eye
R8	10K	10k		read from the schematic by eye
R9	47K	47k		read from the schematic by eye
R10	1M	1M		read from the schematic by eye
R11	1M	1M		read from the schematic by eye
R12	1M	1M		drawn 1H/1M; read from the schematic by eye
R13	10K	10k		read from the schematic by eye
R14	1K	1k		read from the schematic by eye
R15	100K	100k		read from the schematic by eye
R16	22K	22k		read from the schematic by eye
R17	22K	22k		read from the schematic by eye
R18	220K	220k		read from the schematic by eye
R19	390	390		read from the schematic by eye
R20	1K	1k		read from the schematic by eye
R21	1M	1M		read from the schematic by eye
R22	390K	390k		read from the schematic by eye
R23	4.7K	4.7k		read from the schematic by eye
R24	4.7K	4.7k		label partly legible ('R2?'), emitter resistor of Q4; read from the schematic by eye
R25	100K	100k		read from the schematic by eye
R26	100K	100k		read from the schematic by eye
R27	1K	1k		read from the schematic by eye
R28	56K	56k		read from the schematic by eye
R29	470K	470k		read from the schematic by eye
R30	100K	100k		read from the schematic by eye
R31	56K	56k		read from the schematic by eye
R32	56K	56k		read from the schematic by eye
R33	100K	100k		read from the schematic by eye
R34	56K	56k		read from the schematic by eye
R35	1M	1M		read from the schematic by eye
R36	?	?		added from S/N 0300; value not legible (a '100' is printed beside it); read from the schematic by eye
R37	3.9K	3.9k		later units with LED SLP-135B use 3.9K (was 1K); read from the schematic by eye
R38	470	470		read from the schematic by eye
R39	1M	1M		read from the schematic by eye
Capacitors 23
C1	.047uF	47n		read from the schematic by eye
C2	.022uF	22n		read from the schematic by eye
C3	1uF	1u		electrolytic 50V (drawn 1/50); read from the schematic by eye
C4	1uF	1u		electrolytic 50V; read from the schematic by eye
C5	.033uF	33n		read from the schematic by eye
C6	1uF	1u		electrolytic 50V; read from the schematic by eye
C7	47uF	47u		electrolytic 6.3V; read from the schematic by eye
C8	10uF	10u		electrolytic 16V; read from the schematic by eye
C9	.022uF	22n		designator smudged (reads like C6); read from the schematic by eye
C10	1uF	1u		electrolytic 50V; read from the schematic by eye
C11	10uF	10u		electrolytic 16V; read from the schematic by eye
C12	.001uF	1n		read from the schematic by eye
C13	1uF	1u		electrolytic 50V; read from the schematic by eye
C14	1uF	1u		electrolytic 50V; read from the schematic by eye
C15	.047uF	47n		read from the schematic by eye
C16	10uF	10u		electrolytic 16V; read from the schematic by eye
C17	68uF	68u		tantalum 35V; read from the schematic by eye
C18	470pF	470p		read from the schematic by eye
C19	470pF	470p		designator smudged (reads like C18); read from the schematic by eye
C20	220pF	220p		later: 220pF for stable flip-flop (was 470pF); read from the schematic by eye
C21	220pF	220p		later: 220pF (was 470pF); read from the schematic by eye
C22	.01uF	10n		later: 0.01 mylar (was 1/50 or 0.47/50); read from the schematic by eye
C23	100uF	100u		electrolytic 16V; read from the schematic by eye
Diodes 9
D1	RD11EB	RD11EB		11V zener; read from the schematic by eye
D2	RD5.6EB	RD5.6EB		5.6V zener; read from the schematic by eye
D3	RD5.1EB	RD5.1EB		5.1V zener; read from the schematic by eye
D4	1S2473	1S2473		per legend D4-D9; read from the schematic by eye
D5	1S2473	1S2473		per legend D4-D9; read from the schematic by eye
D6	1S2473	1S2473		per legend D4-D9; read from the schematic by eye
D7	1S2473	1S2473		per legend D4-D9; read from the schematic by eye
D8	1S2473	1S2473		per legend D4-D9; added from S/N 0300; read from the schematic by eye
D9	1S2473	1S2473		per legend D4-D9; read from the schematic by eye
Transistors 10
Q1	2SC732TM GR	2SC732TM GR		read from the schematic by eye
Q2	2SC732TM GR	2SC732TM GR		read from the schematic by eye
Q3	2SK30ATM GR	2SK30ATM GR		N-JFET; read from the schematic by eye
Q4	2SC945	2SC945		per legend Q4-Q10; read from the schematic by eye
Q5	2SC945	2SC945		per legend Q4-Q10; read from the schematic by eye
Q6	2SC945	2SC945		per legend Q4-Q10; read from the schematic by eye
Q7	2SC945	2SC945		per legend Q4-Q10; read from the schematic by eye
Q8	2SC945	2SC945		per legend Q4-Q10; read from the schematic by eye
Q9	2SC945	2SC945		per legend Q4-Q10; read from the schematic by eye
Q10	2SC945	2SC945		per legend Q4-Q10; read from the schematic by eye
ICs 1
IC	uPC741C	UPC741C		op amp; read from the schematic by eye
Potentiometers 2
Sens	A100K	A100k	Potentiometer	VR1, drawn 100KA; read from the schematic by eye
Attack	B20K	B20k	Potentiometer	VR2, drawn 20KB; read from the schematic by eye
Trimmers 1
VR3	B10K	10k		drawn 10KB, adjust for -25dBm output; read from the schematic by eye
LEDs 1
D10	SLP135B	SLP135B		check LED; read from the schematic by eye