Enclosure not stated · 2 knobs

Moog 904A

Category: Other· Filters Wahs and VCFs
Controls: Fixed Control Voltage · Regeneration
Price: see vendor
Tags: Filters Wahs and VCFs

Open the schematic at Experimentalists Anonymous

Schematic

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Parts list 91 rows

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Check before you build · 3 values the reader of this schematic was not sure of

Q17-Q21: output-buffer transistor polarity read from hand-drawn arrows; Q18 read as PNP, the rest NPN
C8: drawn '25' with no unit, taken as 25uF
R25-1: value not printed

Ref	Value	Normalized	Type	Notes
Resistors 45
R1	100K	100k		read from the schematic by eye
R2	100K	100k		read from the schematic by eye
R3	100K	100k		read from the schematic by eye
R4	68K	68k		read from the schematic by eye
R5	68	68		read from the schematic by eye
R6	2.7K	2.7k		read from the schematic by eye
R7-1	68K	68k		drawn R7 with subscript 1; read from the schematic by eye
R7-2	1K	1k		drawn R7 with subscript 2; read from the schematic by eye
R9	1.3K	1.3k		read from the schematic by eye
R10-1	1K	1k		subscript 1; read from the schematic by eye
R10-2	27K	27k		subscript 2; read from the schematic by eye
R11-1	1.8K	1.8k		SELECT (select on test); read from the schematic by eye
R12	330	330		no subscript, input buffer to output buffer; read from the schematic by eye
R12-1	51K	51k		subscript 1; read from the schematic by eye
R12-2	330	330		subscript 2; read from the schematic by eye
R14	100	100		read from the schematic by eye
R15	10K	10k		read from the schematic by eye
R16	1K	1k		read from the schematic by eye
R18	10K	10k		read from the schematic by eye
R19	100	100		read from the schematic by eye
R20	8.2K	8.2k		read from the schematic by eye
R21	1K	1k		read from the schematic by eye
R23	470	470		read from the schematic by eye
R25-2	680	680		subscript 2; read from the schematic by eye
R26	220	220		read from the schematic by eye
R27	220	220		read from the schematic by eye
R28	220	220		read from the schematic by eye
R29	68	68		read from the schematic by eye
R30	750	750		read from the schematic by eye
R31	47K	47k		read from the schematic by eye
R32	33K	33k		read from the schematic by eye
R33	330K	330k		read from the schematic by eye
R34	3.3K	3.3k		read from the schematic by eye
R35	680	680		read from the schematic by eye
R36	2.2K	2.2k		read from the schematic by eye
R37	470	470		read from the schematic by eye
R38	68	68		read from the schematic by eye
R39	680	680		read from the schematic by eye
R41	33K	33k		read from the schematic by eye
R42	330	330		read from the schematic by eye
R43	47K	47k		read from the schematic by eye
R44-1	10	10		subscript 1; read from the schematic by eye
R44-2	330K	330k		subscript 2; read from the schematic by eye
R45	47	47		read from the schematic by eye
R46	33	33		read from the schematic by eye
Capacitors 12
C1	.003uF	3n		read from the schematic by eye
C2	100pF	100p		drawn 100MMF; read from the schematic by eye
C3	10uF	10u		64V; read from the schematic by eye
C4	10uF	10u		64V; read from the schematic by eye
C5	80uF	80u		25V; read from the schematic by eye
C6	400uF	400u		25V; read from the schematic by eye
C7	2.5uF	2.5u		electrolytic; read from the schematic by eye
C8	25uF	25u		drawn 25, electrolytic; read from the schematic by eye
C9	10uF	10u		64V; read from the schematic by eye
×4	1.2uF	1.2u		range capacitors, position 1 of S1; read from the schematic by eye
×4	0.3uF	300n		range capacitors, position 2 of S1; read from the schematic by eye
×4	0.075uF	75n		range capacitors, position 3 of S1; read from the schematic by eye
Diodes 3
×2	1N4004	1N4004		supply diodes; read from the schematic by eye
×2	CL-1	CL-1		CL-1 diode-symbol parts (one at Q6, one at output buffer); designator printed twice; read from the schematic by eye
×1	Diode	DIODE		output buffer, no part number given; read from the schematic by eye
Transistors 23
Q1	2N4058	2N4058		PNP per note 2; read from the schematic by eye
Q2	2N4058	2N4058		PNP per note 2; read from the schematic by eye
Q3	2N3392	2N3392		NPN per note 1; read from the schematic by eye
Q4	2N3392	2N3392		NPN per note 1; read from the schematic by eye
Q5	2N3392	2N3392		NPN per note 1; read from the schematic by eye
Q6	2N3392	2N3392		NPN per note 1; read from the schematic by eye
Q7	2N3392	2N3392		NPN per note 1; read from the schematic by eye
Q8	2N3392	2N3392		NPN per note 1; read from the schematic by eye
Q9	2N3392	2N3392		NPN per note 1; read from the schematic by eye
Q10	2N3392	2N3392		NPN per note 1; read from the schematic by eye
Q11	2N3392	2N3392		NPN per note 1; read from the schematic by eye
Q12	2N3392	2N3392		NPN per note 1; read from the schematic by eye
Q13	2N3392	2N3392		NPN per note 1; read from the schematic by eye
Q14	2N3392	2N3392		NPN per note 1; read from the schematic by eye
Q15	2N3392	2N3392		NPN per note 1; read from the schematic by eye
Q16	2N3392	2N3392		NPN per note 1; read from the schematic by eye
Q17	2N3392	2N3392		NPN per note 1 (symbol read as NPN); read from the schematic by eye
Q18	2N4058	2N4058		PNP per note 2; read from the schematic by eye
Q19	2N3392	2N3392		NPN per note 1 (symbol read as NPN); read from the schematic by eye
Q20	2N3392	2N3392		NPN per note 1 (symbol read as NPN); read from the schematic by eye
Q21	2N3392	2N3392		NPN per note 1 (symbol read as NPN); read from the schematic by eye
Q22	2N3392	2N3392		NPN per note 1; read from the schematic by eye
Q23	2N3392	2N3392		NPN per note 1; read from the schematic by eye
Potentiometers 2
Fixed Control Voltage	5K	5k	Potentiometer	R11 subscript 2; read from the schematic by eye
Regeneration	50K	50k	Potentiometer	R22, reverse audio taper; read from the schematic by eye
Trimmers 5
R8	1K	1k		variable resistor in adder; read from the schematic by eye
R17	10	10		read from the schematic by eye
R24	2.5K	2.5k		read from the schematic by eye
R25-1	?	?		subscript 1; value not printed; read from the schematic by eye
R40	1K	1k		read from the schematic by eye
Switches 1
S1	4P3T	4P3T		range switch; read from the schematic by eye