Enclosure not stated · 2 knobs

Simple BL3208 echo

Category: Delay· Delay Echo and Samplers
Controls: Echo · Time
Price: see vendor
Tags: Delay Echo and Samplers

Open the schematic at Experimentalists Anonymous

Schematic

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Parts list 85 rows

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

R30/R30B: the drawing prints R30 twice (47K at IC4, 4.7K at TR1)
VR2 and one undesignated cap near J3 have no value drawn

Ref	Value	Normalized	Type	Notes
Resistors 39
R1	1K	1k		read from the schematic by eye
R2	39K	39k		read from the schematic by eye
R3	100K	100k		read from the schematic by eye
R4	100K	100k		read from the schematic by eye
R5	100	100		read from the schematic by eye
R6	100	100		read from the schematic by eye
R7	120K	120k		read from the schematic by eye
R8	120K	120k		read from the schematic by eye
R9	120K	120k		read from the schematic by eye
R10	39K	39k		read from the schematic by eye
R11	120K	120k		read from the schematic by eye
R13	100K	100k		read from the schematic by eye
R14	47K	47k		read from the schematic by eye
R16	39K	39k		read from the schematic by eye
R17	120K	120k		read from the schematic by eye
R18	100K	100k		read from the schematic by eye
R19	100K	100k		read from the schematic by eye
R20	100K	100k		read from the schematic by eye
R21	1K	1k		read from the schematic by eye
R22	39K	39k		read from the schematic by eye
R23	39K	39k		read from the schematic by eye
R24	39K	39k		read from the schematic by eye
R25	39K	39k		read from the schematic by eye
R26	120K	120k		read from the schematic by eye
R27	39K	39k		read from the schematic by eye
R28	47K	47k		read from the schematic by eye
R29	100	100		read from the schematic by eye
R30	47K	47k		at IC4 pin 7; designator R30 is printed twice; read from the schematic by eye
R30B	4.7K	4.7k		second R30, at TR1 base; renamed here because of the clash; read from the schematic by eye
R31	4.7K	4.7k		read from the schematic by eye
R32	120K	120k		read from the schematic by eye
R33	120K	120k		read from the schematic by eye
R34	1K	1k		read from the schematic by eye
R35	100	100		read from the schematic by eye
R36	47K	47k		read from the schematic by eye
R37	120K	120k		read from the schematic by eye
R39	4.7K	4.7k		read from the schematic by eye
R40	100	100		read from the schematic by eye
R41	1K	1k		read from the schematic by eye
Capacitors 35
C1	2.2uF	2.2u		electrolytic, 50V; read from the schematic by eye
C2	0.001uF	1n		read from the schematic by eye
C3	0.1uF	100n		read from the schematic by eye
C4	47uF	47u		electrolytic, 10V; read from the schematic by eye
C5	22pF	22p		read from the schematic by eye
C7	.0033uF	3.3n		read from the schematic by eye
C9	47uF	47u		electrolytic, 10V; read from the schematic by eye
C10	220pF	220p		read from the schematic by eye
C11	0.0033uF	3.3n		mylar; read from the schematic by eye
C12	0.0033uF	3.3n		mylar; read from the schematic by eye
C13	220pF	220p		read from the schematic by eye
C14	2.2uF	2.2u		electrolytic, 50V; read from the schematic by eye
C15	2.2uF	2.2u		electrolytic, 25V; read from the schematic by eye
C16	0.0033uF	3.3n		mylar; read from the schematic by eye
C17	0.0033uF	3.3n		mylar; read from the schematic by eye
C18	0.0033uF	3.3n		mylar; read from the schematic by eye
C19	220pF	220p		read from the schematic by eye
C20	2.2uF	2.2u		electrolytic, 50V; read from the schematic by eye
C21	10uF	10u		electrolytic, 10V; read from the schematic by eye
C22	0.001uF	1n		read from the schematic by eye
C23	2.2uF	2.2u		electrolytic, 50V; read from the schematic by eye
C24	2.2uF	2.2u		electrolytic, 50V; read from the schematic by eye
C25	2.2uF	2.2u		electrolytic, 50V; read from the schematic by eye
C26	0.01uF	10n		read from the schematic by eye
C27	0.1uF	100n		read from the schematic by eye
C28	220uF	220u		electrolytic, 16V; read from the schematic by eye
C30	47uF	47u		electrolytic, 10V; read from the schematic by eye
C32	0.001uF	1n		read from the schematic by eye
C33	0.1uF	100n		read from the schematic by eye
C36	0.0033uF	3.3n		mylar; read from the schematic by eye
C37	.01uF	10n		read from the schematic by eye
C62	2.2uF	2.2u		electrolytic, 50V; read from the schematic by eye
C82	2.2uF	2.2u		electrolytic, 50V; read from the schematic by eye
×2	0.1uF	100n		undesignated bypass caps, bottom left; read from the schematic by eye
×1	?	?		undesignated cap on the J3 E (echo/time) line, no value drawn; read from the schematic by eye
Diodes 1
D1	1N4148	1N4148		drawn IN4148; read from the schematic by eye
Transistors 1
TR1	2SC945	2SC945		NPN; read from the schematic by eye
ICs 4
IC1	BA4450	BA4450		dual op amp, from legend; read from the schematic by eye
IC2	LM324	LM324		quad op amp, from legend; read from the schematic by eye
IC3	MN3008	MN3008		BBD, drawn MIN 3008; read from the schematic by eye
IC4	MN3101	MN3101		BBD clock; read from the schematic by eye
Potentiometers 2
Echo	50K	50k	Potentiometer	VR502, off board; read from the schematic by eye
Time	50K	50k	Potentiometer	VR503, off board; read from the schematic by eye
Trimmers 2
VR1	50K	50k		read from the schematic by eye
VR2	?	?		no value drawn; read from the schematic by eye
Switches 1
Echo SW	SPST	SPST		echo on/off switch on J5; read from the schematic by eye