Enclosure not stated · 3 knobs

Envelope Modification Unit

Category: Wah / Envelope· Guitar Synth and Misc Signal Shapers
Controls: Attack · Decay · Delay
Price: see vendor
Tags: Guitar Synth and Misc Signal Shapers

Open the schematic at Experimentalists Anonymous

Schematic

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Parts list 30 rows

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

Attack/Delay: knob-to-designator mapping for R14 and R16 inferred from the circuit, the board labels Attack, Decay, Delay

Ref	Value	Normalized	Type	Notes
Resistors 14
R1	10K	10k		read from the schematic by eye
R2	10K	10k		read from the schematic by eye
R3	100	100		read from the schematic by eye
R4	10K	10k		read from the schematic by eye
R5	10K	10k		read from the schematic by eye
R6	330K	330k		read from the schematic by eye
R7	10K	10k		read from the schematic by eye
R8	100K	100k		read from the schematic by eye
R9	10K	10k		read from the schematic by eye
R10	100K	100k		parts list also prints a stray 'R10 100 ohms' line; schematic shows 100K; read from the schematic by eye
R11	100K	100k		read from the schematic by eye
R12	100K	100k		read from the schematic by eye
R13	100K	100k		read from the schematic by eye
R17	470	470		read from the schematic by eye
Capacitors 5
C1	1uF	1u		electrolytic 25V; read from the schematic by eye
C2	.001uF	1n		disc; read from the schematic by eye
C3	10uF	10u		electrolytic 25V; read from the schematic by eye
C4	10uF	10u		electrolytic 25V; read from the schematic by eye
C5	.01uF	10n		disc; read from the schematic by eye
Diodes 3
D1	1N914	1N914		or similar switching diode; read from the schematic by eye
D2	1N914	1N914		read from the schematic by eye
D3	1N914	1N914		read from the schematic by eye
ICs 4
IC1	5558	5558		dual op amp, or MC1458; read from the schematic by eye
IC2	CA3080	CA3080		OTA; read from the schematic by eye
IC3	5558	5558		dual op amp, or MC1458; read from the schematic by eye
IC4	555	555		timer; read from the schematic by eye
Potentiometers 3
Attack	B500K	B500k	Potentiometer	R14, linear; knob name inferred from circuit (charges C3 via D2); read from the schematic by eye
Decay	B500K	B500k	Potentiometer	R15, linear; text says C3 decays through R15; read from the schematic by eye
Delay	B500K	B500k	Potentiometer	R16, linear; sets the 555 one-shot time; read from the schematic by eye
Switches 1
S1	DPST	DPST		power switch, both batteries; read from the schematic by eye