Enclosure not stated · 4 knobs

Dandy Horse Echo Chorus/Flanger

Category: Vibrato / Chorus
Controls: Fdbk · Rate · Tune · Width
Price: $18.99in stock

Buy the PCB at Lectric-FX Build document Parts list (Google Sheet)

From the vendor

The Dandy Horse is a reproduction of the vintage EHX Echo Flanger circuit, a 4 in 1 effect producing a chorus, flanger, fixed flanger filter and double track delay effect, adapted to use either two 3007 or two 3207 BBDs in place of the original’s two unobtanium SAD1024…

Expert level build

Click this link for Bill of Materials

Click this link for VOLTAGES

Please note that voltages were measured while in FLANGER mode.

Click pdf icon for the rest of the build documentation. 🙂

Schematic

The schematic is in the vendor's build document. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 156 rows

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Ref	Value	Normalized	Type	Notes
Resistors 66
R1	100k	100k
R2	100k	100k
R3	18k	18k
R4	100k	100k
R5	47k	47k
R6	47k	47k
R7	3k	3k
R8	3k	3k
R9	3k	3k
R10	68k	68k
R12	12k	12k
R13	18k	18k
R14	100k	100k
R15	100k	100k
R17	100k	100k
R19	12k	12k
R20	100k	100k
R21	3k	3k
R22	6k2	6.2k
R23	47k	47k
R24	16k	16k
R25	3k	3k
R26	3k	3k
R27	3k	3k
R28	2M2	2.2M
R29	9k1	9.1k
R30	1k	1k
R31	750R	750
R32	27k	27k
R33	4k7	4.7k
R34	4k7	4.7k
R35	1M	1M
R36	100k	100k
R37	1M	1M
R38	220k	220k
R39	100R	100
R40	9k1	9.1k
R41	100k	100k
R42	1M	1M
R43	33k	33k
R44	100k	100k
R45	3k3	3.3k
R46	100k	100k
R47	8k2	8.2k
R48	1M	1M
R49	47k	47k
R50	33k	33k
R51	1k8	1.8k
R52	4k7	4.7k
R53	1M	1M
R54	220k	220k
R55	220k	220k
R56	1M	1M
R57	1k	1k
R58	100k	100k
R59	47k	47k
R60	2k	2k
R61	68k	68k
R62	4k7	4.7k
R63	4K7	4.7k
R64	130K	130k
R65	16k	16k
R66	22R	22
R67	16k	16k
R68	3K	3k
R72	9k1	9.1k
Capacitors 55
C1	100n	100n
C2	47n	47n
C3	4n7	4.7n
C4	1uF	1u	electro
C5	3n9	3.9n
C6	4u7	4.7u
C7	22uF	22u
C8	18n	18n
C9	2n7	2.7n
C10	47n	47n
C11	100n	100n
C12	120p	120p
C13	220p	220p
C14	100n	100n
C15	100n	100n
C18	220p	220p
C19	100n	100n
C20	2n7	2.7n
C21	1n5	1.5n
C22	47n	47n
C23	18n	18n
C24	2n2	2.2n
C25	4u7	4.7u
C26	220n	220n
C27	47n	47n
C28	22uF	22u
C29	10n	10n
C30	4u7	4.7u
C31	4u7	4.7u
C32	4n7	4.7n
C33	220n	220n
C34	4u7	4.7u
C35	4u7	4.7u
C36	22uF	22u
C37	22uF	22u
C38	100n	100n
C39	100n	100n
C40	100n	100n
C41	100n	100n
C42	22p	22p
C44	68p	68p
C46	1uF	1u	electro
C47	1uF	1u	electro
C48	22uF	22u
C49	22uF	22u
C50	22uF	22u
C51	100uF	100u
C52	220uF	220u
C53	10u	10u
C54	100uF	100u
C56	220n	220n
C57	47p	47p
C59	22u	22u
C63	100n	100n
C64	100uF	100u
Diodes 6
D1	1n914	1N914
D2	1n914	1N914
D5	1n4002	1N4002
D6	1n5817	1N5817
D7	1n5817	1N5817
D8	1n5817	1N5817
Transistors 2
Q1	2N5088	2N5088
Q2	2N5087	2N5087
ICs 13
IC1	JRC4558	JRC4558
IC2	NE570	NE570		or NE571 or v571
IC3	MN3007	MN3007		or v3207
IC4	MN3007	MN3007		or v3207
IC5	JRC4558	JRC4558
IC6	CD4053	CD4053
IC7	CD4053	CD4053
IC8	LM324	LM324
IC9	LM311	LM311
IC10	CD4049 - does not matter BE or UBE	CD4049 - DOES NOT MATTER BE OR UBE
IC11	LM78L15	LM78L15
IC12	CD4013	CD4013
IC13	LT1054	LT1054
Potentiometers 4
FDBK	10KA	A10k
RATE	1MC	C1M
TUNE	100KB	B100k
WIDTH	100KC	C100k
Trimmers 8
BIAS1	100k	100k
BIAS2	100k	100k
LVL	100k	100k
CANCEL	5k	5k
CLOCK	10k	10k
FDBK1	10k	10k
GAIN1	100k	100k
GAIN2	10k	10k
Switches 2
Mode	2P4T Mini Rotary	2P4T MINI ROTARY
Blend	SPDT On On	SPDT ON ON