Enclosure not stated · 2 knobs

MXR Envelope Filter

Based on the MXR Envelope Filter· 2 other boards clone it

Category: Wah / Envelope· Filters Wahs and VCFs
Controls: Threshold · Attack
Price: see vendor
Tags: Filters Wahs and VCFs

Open the schematic at Experimentalists Anonymous

Schematic

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Parts list 47 rows

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

C4: .01 written beside a crossed-out value

Ref	Value	Normalized	Type	Notes
Resistors 27
R1	3.6K	3.6k		read from the schematic by eye
R2	200K	200k		read from the schematic by eye
R3	10M	10M		read from the schematic by eye
R4	3K	3k		read from the schematic by eye
R5	10K	10k		read from the schematic by eye
R6	5.1M	5.1M		read from the schematic by eye
R7	200K	200k		read from the schematic by eye
R8	1M	1M		read from the schematic by eye
R9	22M	22M		read from the schematic by eye
R10	10K	10k		read from the schematic by eye
R11	470K	470k		read from the schematic by eye
R12	200K	200k		read from the schematic by eye
R13	240K	240k		read from the schematic by eye
R14	62K	62k		read from the schematic by eye
R15	10M	10M		read from the schematic by eye
R16	100K	100k		read from the schematic by eye
R17	1M	1M		read from the schematic by eye
R18	47K	47k		read from the schematic by eye
R19	200K	200k		read from the schematic by eye
R20	100K	100k		read from the schematic by eye
R21	100K	100k		read from the schematic by eye
R22	47K	47k		read from the schematic by eye
R23	47K	47k		read from the schematic by eye
R24	22M	22M		read from the schematic by eye
R25	47K	47k		read from the schematic by eye
R26	47K	47k		read from the schematic by eye
R29	2.2K	2.2k		read from the schematic by eye
Capacitors 11
C1	.1uF	100n		read from the schematic by eye
C2	.05uF	50n		read from the schematic by eye
C3	.05uF	50n		read from the schematic by eye
C4	.01uF	10n		an earlier value is crossed out; read from the schematic by eye
C5	.05uF	50n		read from the schematic by eye
C6	.001uF	1n		read from the schematic by eye
C7	.001uF	1n		read from the schematic by eye
C8	100pF	100p		read from the schematic by eye
C9	.05uF	50n		read from the schematic by eye
C10	10pF	10p		read from the schematic by eye
C11	47uF	47u		drawn '47'; sheet notes capacitance is in uF, 10V/25V; read from the schematic by eye
Diodes 3
CR1	1N914	1N914		read from the schematic by eye
CR2	1N914	1N914		read from the schematic by eye
CR3	1N270	1N270		germanium; reverse-polarity protection; read from the schematic by eye
ICs 3
A1	CD4069	CD4069		hex inverter used as linear amps and the 37kHz oscillator; read from the schematic by eye
A2	CD4069	CD4069		hex inverter used as the filter's linear amps; read from the schematic by eye
A3	CD4016	CD4016		quad bilateral switch, U1/U2 sections used as the PWM-controlled resistors; read from the schematic by eye
Potentiometers 2
Threshold	500K	500k	Potentiometer	R27; read from the schematic by eye
Attack	500K	500k	Potentiometer	R28; read from the schematic by eye
LEDs 1
DS1	LED	LED		read from the schematic by eye

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