Enclosure not stated · 2 knobs

Tau 1010 Ladder Filter

Category: EQ / Filter· Filters Wahs and VCFs
Controls: Resonance · Range
Price: see vendor
Tags: Filters Wahs and VCFs

Open the schematic at Experimentalists Anonymous

Schematic

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Parts list 66 rows

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

R30: drawn as a pot with no control name; could be a panel pot rather than a trimmer
R24/R38: no taper; trimmer vs pot inferred from labels

Ref	Value	Normalized	Type	Notes
Resistors 34
R1	39K	39k		read from the schematic by eye
R2	100K	100k		read from the schematic by eye
R3	3.3K	3.3k		drawn "3,3K"; read from the schematic by eye
R4	3.3K	3.3k		read from the schematic by eye
R5	100K	100k		read from the schematic by eye
R6	100K	100k		read from the schematic by eye
R7	12K	12k		read from the schematic by eye
R9	220	220		read from the schematic by eye
R10	220	220		read from the schematic by eye
R11	180K	180k		read from the schematic by eye
R12	147K	147k		read from the schematic by eye
R13	3.3K	3.3k		read from the schematic by eye
R14	3.3K	3.3k		read from the schematic by eye
R15	100K	100k		read from the schematic by eye
R17	1K	1k		read from the schematic by eye
R18	6.8K	6.8k		read from the schematic by eye
R19	2K	2k		read from the schematic by eye
R20	1.5M	1.5M		value label drawn offset over R22; read from the schematic by eye
R21	91K	91k		read from the schematic by eye
R22	147K	147k		read from the schematic by eye
R23	470	470		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	470	470		read from the schematic by eye
R28	470	470		read from the schematic by eye
R29	26K	26k		read from the schematic by eye
R31	39K	39k		read from the schematic by eye
R32	15K	15k		read from the schematic by eye
R33	10K	10k		read from the schematic by eye
R34	680	680		read from the schematic by eye
R35	680	680		read from the schematic by eye
R36	100K	100k		read from the schematic by eye
R37	100K	100k		read from the schematic by eye
R39	100K	100k		read from the schematic by eye
Capacitors 7
C1	.01uF	10n		read from the schematic by eye
C2	.01uF	10n		read from the schematic by eye
C3	.01uF	10n		read from the schematic by eye
C4	.01uF	10n		read from the schematic by eye
C5	18pF	18p		LM301A compensation; read from the schematic by eye
C6	18pF	18p		read from the schematic by eye
C7	.05uF	50n		read from the schematic by eye
Diodes 2
D1	1N4148	1N4148		read from the schematic by eye
D2	1N4148	1N4148		read from the schematic by eye
Transistors 15
Q1	?	?		PNP, no part number given; read from the schematic by eye
Q2	?	?		PNP, no part number given; read from the schematic by eye
Q3	?	?		PNP, no part number given; read from the schematic by eye
Q4	?	?		PNP, no part number given; read from the schematic by eye
Q5	?	?		PNP, no part number given; read from the schematic by eye
Q6	?	?		PNP, no part number given; read from the schematic by eye
Q7	?	?		PNP, no part number given; read from the schematic by eye
Q8	?	?		PNP, no part number given; read from the schematic by eye
Q9	?	?		PNP, no part number given; read from the schematic by eye
Q10	?	?		PNP, no part number given; read from the schematic by eye
Q11	?	?		PNP, no part number given; read from the schematic by eye
Q12	?	?		PNP, no part number given; read from the schematic by eye
Q13	?	?		PNP, no part number given; read from the schematic by eye
Q14	?	?		N-channel JFET, no part number given; read from the schematic by eye
Q15	?	?		N-channel JFET, no part number given; read from the schematic by eye
ICs 1
U1	LM301A	LM301A		read from the schematic by eye
Potentiometers 2
Resonance	1MEG	1M	Potentiometer	R8, wired as variable resistor; read from the schematic by eye
Range	10K	10k	Potentiometer	R16; read from the schematic by eye
Trimmers 3
R24	20K	20k		CV scaling, wired as variable resistor; read from the schematic by eye
R30	200K	200k		unlabeled, wired as variable resistor in output stage feedback; read from the schematic by eye
Offset Adjust	20K	20k		R38; read from the schematic by eye
Other 2
×1	LA/M 1212	LA/M 1212		"mysterious exponential converter" module (Tau Systems); read from the schematic by eye
×1	USC 1220	USC 1220		"mysterious part (OTA & opamp?)" module (Tau Systems); read from the schematic by eye