Enclosure not stated · 3 knobs

Electro Harmonix Echo Flanger 1

Based on the Electro-Harmonix Echo Flanger 1

Category: Flanger· Flangers
Controls: Rate · Width · Tune
Price: see vendor
Tags: Flangers

Open the schematic at Experimentalists Anonymous

Schematic

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Parts list 52 rows

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

C30/C31: '50uF' may be each cap or the pair
C41: printed twice (tantalum 1uF and the +7.5V filter cap)
Width: taper marking circled and partly overwritten, read as CCW log

Ref	Value	Normalized	Type	Notes
Resistors 19
R39	46.4K	46.4k		1%; read from the schematic by eye
R40	18K	18k		read from the schematic by eye
R41	1.82K	1.82k		1%; read from the schematic by eye
R42	4.7K	4.7k		read from the schematic by eye
R43	1M	1M		read from the schematic by eye
R44	220K	220k		read from the schematic by eye
R45	1M	1M		read from the schematic by eye
R46	220K	220k		read from the schematic by eye
R47	1K	1k		read from the schematic by eye
R48	100K	100k		read from the schematic by eye
R49	46.4K	46.4k		1%; read from the schematic by eye
R50	2.00K	2k		1%; read from the schematic by eye
R51	68K	68k		read from the schematic by eye
R52	4.7K	4.7k		read from the schematic by eye
R53	130K	130k		read from the schematic by eye
R55	3K	3k		read from the schematic by eye
R56	15.8K	15.8k		1%; read from the schematic by eye
R57	15.8K	15.8k		1%; read from the schematic by eye
×1	4.7K	4.7k		Q1 base bias, no designator; read from the schematic by eye
Capacitors 14
C30	50uF	50u		electrolytic, back-to-back with C31 as a non-polar pair; '50uF' drawn once between them, could be the pair's total; read from the schematic by eye
C31	50uF	50u		electrolytic, back-to-back with C30; read from the schematic by eye
C32	.1uF	100n		read from the schematic by eye
C33	.1uF	100n		read from the schematic by eye
C34	.1uF	100n		read from the schematic by eye
C35	.1uF	100n		read from the schematic by eye
C36	47pF	47p		read from the schematic by eye
C37	150pF	150p		±10%; read from the schematic by eye
C38	470uF	470u		35V electrolytic; read from the schematic by eye
C39	470uF	470u		25V electrolytic; read from the schematic by eye
C40	15uF	15u		electrolytic; read from the schematic by eye
C41	1uF	1u		tantalum (annotated '? TANT'), IC10/IC11 supply bypass; read from the schematic by eye
C41-2	?	?		designator C41 printed twice; this is the +7.5V output electrolytic, no value given; read from the schematic by eye
C42	1uF	1u		tantalum; read from the schematic by eye
Diodes 4
D1	1N4001	1N4001		read from the schematic by eye
D2	1N4001	1N4001		read from the schematic by eye
D4	1N914	1N914		read from the schematic by eye
D6	1N914	1N914		read from the schematic by eye
Transistors 1
Q1	2N5087	2N5087		PNP current source; read from the schematic by eye
ICs 6
IC7	CD4053	CD4053		read from the schematic by eye
IC8	324	324		LM324 quad op amp (IC8A-IC8D); read from the schematic by eye
IC9	311	311		LM311 comparator; read from the schematic by eye
IC10	CD4013	CD4013		read from the schematic by eye
IC11	CD4009	CD4009		read from the schematic by eye
IC12	78L15A	78L15A		15V regulator; read from the schematic by eye
Potentiometers 3
Rate	A2M	A2M	Potentiometer	VR1, 2M CCW log; read from the schematic by eye
Width	A100K	A100k	Potentiometer	VR2, 100K CCW log; read from the schematic by eye
Tune	B100K	B100k	Potentiometer	VR3, 100K lin; read from the schematic by eye
Trimmers 3
TR4	10K	10k		V2 bias; read from the schematic by eye
TR5	10K	10k		V3 bias; read from the schematic by eye
TR7	10K	10k		read from the schematic by eye
Switches 1
S2	SP4T	SP4T		mode switch: filter matrix / flange / chorus / slapback; read from the schematic by eye
LEDs 1
D3	LED	LED		power indicator (V1); read from the schematic by eye