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Moog 904B

Category: Other· Filters Wahs and VCFs
Price: see vendor
Tags: Filters Wahs and VCFs

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Schematic

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Parts list 118 rows

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

R10, R19, R21: read 2.2K like R4/R6/R8/R17/R23 but the dot is faint, could be 22K
R30: drawn as a second R20 (68K) in the audio amp
Q14/18/22/26, Q28: NPN/PNP assignment (and so 2N3392 vs 2N4058) read from small emitter arrows
Range: switch poles/positions inferred from the drawing

Ref	Value	Normalized	Type	Notes
Resistors 53
R1	200	200		read from the schematic by eye
R2	390	390		read from the schematic by eye
R3	150K	150k		read from the schematic by eye
R4	2.2K	2.2k		read from the schematic by eye
R5	150K	150k		read from the schematic by eye
R6	2.2K	2.2k		read from the schematic by eye
R7	150K	150k		read from the schematic by eye
R8	2.2K	2.2k		read from the schematic by eye
R9	150K	150k		read from the schematic by eye
R10	2.2K	2.2k		could be 22K; read from the schematic by eye
R11	620	620		read from the schematic by eye
R12	100K	100k		read from the schematic by eye
R13	1K	1k		read from the schematic by eye
R14	3.6K	3.6k		read from the schematic by eye
R15	33K	33k		read from the schematic by eye
R16	300	300		read from the schematic by eye
R17	2.2K	2.2k		read from the schematic by eye
R18	1K	1k		read from the schematic by eye
R19	2.2K	2.2k		could be 22K; read from the schematic by eye
R20	1K	1k		read from the schematic by eye
R21	2.2K	2.2k		could be 22K; read from the schematic by eye
R22	1K	1k		read from the schematic by eye
R23	2.2K	2.2k		read from the schematic by eye
R24	1K	1k		read from the schematic by eye
R25	100K	100k		read from the schematic by eye
R26	510	510		read from the schematic by eye
R27	47K	47k		read from the schematic by eye
R28	2.2K	2.2k		read from the schematic by eye
R29	620	620		read from the schematic by eye
R30	68K	68k		drawn 'R20' (68K, audio amp feedback) - clashes with R20 1K in the filter; renumbered; read from the schematic by eye
R31	68K	68k		read from the schematic by eye
R32	68K	68k		read from the schematic by eye
R33	18K	18k		read from the schematic by eye
R34	1.2K	1.2k		read from the schematic by eye
R35	100	100		1%; read from the schematic by eye
R36	68K	68k		read from the schematic by eye
R37	68K	68k		read from the schematic by eye
R38	18K	18k		read from the schematic by eye
R39	1.2K	1.2k		read from the schematic by eye
R40	100	100		1%; read from the schematic by eye
R41	68	68		read from the schematic by eye
R42	68	68		read from the schematic by eye
R43	27K	27k		read from the schematic by eye
R44	1.3K	1.3k		read from the schematic by eye
R45	2210	2.21k		1%; read from the schematic by eye
R46	27K	27k		read from the schematic by eye
R47	2210	2.21k		1%; 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	100K	100k		read from the schematic by eye
R51	1.8K	1.8k		read from the schematic by eye
R52	8.2K	8.2k		read from the schematic by eye
R53	51K	51k		read from the schematic by eye
Capacitors 28
C1	80uF	80u		electrolytic; read from the schematic by eye
C2	200uF	200u		electrolytic; read from the schematic by eye
C3	.1uF	100n		read from the schematic by eye
C4	2200pF	2.2n		read from the schematic by eye
C5	.39uF	390n		read from the schematic by eye
C6	.39uF	390n		read from the schematic by eye
C7	.39uF	390n		read from the schematic by eye
C8	.39uF	390n		read from the schematic by eye
C9	10uF	10u		electrolytic; read from the schematic by eye
C10	32uF	32u		electrolytic; read from the schematic by eye
C11	47pF	47p		read from the schematic by eye
C12	80uF	80u		electrolytic; read from the schematic by eye
C13	.1uF	100n		read from the schematic by eye
C14	.022uF	22n		read from the schematic by eye
C15	.68uF	680n		read from the schematic by eye
C16	.01uF	10n		read from the schematic by eye
C17	.68uF	680n		read from the schematic by eye
C18	.01uF	10n		read from the schematic by eye
C19	.022uF	22n		read from the schematic by eye
C20	.68uF	680n		read from the schematic by eye
C21	.01uF	10n		read from the schematic by eye
C22	.68uF	680n		read from the schematic by eye
C23	.01uF	10n		read from the schematic by eye
C24	82pF	82p		read from the schematic by eye
C25	.047uF	47n		read from the schematic by eye
C26	.047uF	47n		read from the schematic by eye
C27	220pF	220p		read from the schematic by eye
C28	220pF	220p		read from the schematic by eye
Diodes 3
D1	1N346	1N346		drawn IN346; read from the schematic by eye
D2	1N346	1N346		drawn IN346; read from the schematic by eye
D3	A14A	A14A		read from the schematic by eye
Transistors 29
Q1	2N3392	2N3392		NPN per legend; matched pair with Q2; read from the schematic by eye
Q2	2N3392	2N3392		NPN per legend; matched pair with Q1; read from the schematic by eye
Q3	2N4058	2N4058		PNP per legend; matched pair with Q4; read from the schematic by eye
Q4	2N4058	2N4058		PNP per legend; matched pair with Q3; read from the schematic by eye
Q5	2N3392	2N3392		NPN per legend; read from the schematic by eye
Q6	2N3392	2N3392		NPN per legend; matched pair with Q7; read from the schematic by eye
Q7	2N3392	2N3392		NPN per legend; matched pair with Q6; read from the schematic by eye
Q8	2N4058	2N4058		PNP per legend; matched pair with Q9; read from the schematic by eye
Q9	2N4058	2N4058		PNP per legend; matched pair with Q8; read from the schematic by eye
Q10	2N3392	2N3392		NPN per legend; read from the schematic by eye
Q11	2N3392	2N3392		NPN per legend; read from the schematic by eye
Q12	2N4058	2N4058		PNP per legend; read from the schematic by eye
Q13	2N3392	2N3392		NPN per legend; matched set Q13/17/21/25; read from the schematic by eye
Q14	2N4058	2N4058		PNP per legend; matched set Q14/18/22/26; read from the schematic by eye
Q15	2N3392	2N3392		NPN per legend; read from the schematic by eye
Q16	2N4058	2N4058		PNP per legend; read from the schematic by eye
Q17	2N3392	2N3392		NPN per legend; matched set Q13/17/21/25; read from the schematic by eye
Q18	2N4058	2N4058		PNP per legend; matched set Q14/18/22/26; read from the schematic by eye
Q19	2N3392	2N3392		NPN per legend; read from the schematic by eye
Q20	2N4058	2N4058		PNP per legend; read from the schematic by eye
Q21	2N3392	2N3392		NPN per legend; matched set Q13/17/21/25; read from the schematic by eye
Q22	2N4058	2N4058		PNP per legend; matched set Q14/18/22/26; read from the schematic by eye
Q23	2N3392	2N3392		NPN per legend; read from the schematic by eye
Q24	2N4058	2N4058		PNP per legend; read from the schematic by eye
Q25	2N3392	2N3392		NPN per legend; matched set Q13/17/21/25; read from the schematic by eye
Q26	2N4058	2N4058		PNP per legend; matched set Q14/18/22/26; read from the schematic by eye
Q27	2N3391A	2N3391A		NPN; read from the schematic by eye
Q28	2N4058	2N4058		PNP per legend; read from the schematic by eye
Q29	2N3392	2N3392		NPN per legend; read from the schematic by eye
Potentiometers 1
P4	5K	5k	Potentiometer	front panel fixed control voltage; read from the schematic by eye
Trimmers 3
P1	100K	100k		output zero trim; 60K crossed out; read from the schematic by eye
P2	1K	1k		scale trim; read from the schematic by eye
P3	100	100		20 kHz level trim; read from the schematic by eye
Switches 1
Range	4P3T	4P3T		front-panel range switch, four wafers ganged; pole/throw count inferred; read from the schematic by eye