Enclosure not stated · 10 knobs

EHX Bass Microsynth

Based on the Electro-Harmonix Bass Microsynth

Category: Ring Mod / Synth· Guitar Synth and Misc Signal Shapers
Controls: Guitar · Octave · Trigger · Square Wave · Sub-Octave · Stop Frequency · Sweep Rate · Resonance · Start Frequency · Attack Delay
Price: see vendor
Tags: Guitar Synth and Misc Signal Shapers

Open the schematic at Experimentalists Anonymous

Schematic

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Parts list 192 rows

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

R3, R14: Pre-Amp Gain and Squelch are drawn as variable resistors, taken as internal trimmers (not front-panel sliders)

Ref	Value	Normalized	Type	Notes
Resistors 99
R1	68K	68k		read from the schematic by eye
R2	4.7K	4.7k		read from the schematic by eye
R4	470	470		read from the schematic by eye
R5	13K	13k		read from the schematic by eye
R7	2.2K	2.2k		read from the schematic by eye
R8	3.3K	3.3k		read from the schematic by eye
R9	33K	33k		read from the schematic by eye
R10	10K	10k		read from the schematic by eye
R11	10K	10k		read from the schematic by eye
R12	7.5K	7.5k		read from the schematic by eye
R13	15K	15k		read from the schematic by eye
R15	3.3M	3.3M		read from the schematic by eye
R16	27K	27k		read from the schematic by eye
R17	2.7K	2.7k		read from the schematic by eye
R18	27K	27k		read from the schematic by eye
R19	560	560		read from the schematic by eye
R20	3.3K	3.3k		read from the schematic by eye
R21	2.2K	2.2k		read from the schematic by eye
R22	22K	22k		read from the schematic by eye
R23	47K	47k		read from the schematic by eye
R24	1K	1k		read from the schematic by eye
R25	22K	22k		read from the schematic by eye
R26	820	820		read from the schematic by eye
R27	4.7K	4.7k		read from the schematic by eye
R29	8.2K	8.2k		read from the schematic by eye
R30	2.2K	2.2k		read from the schematic by eye
R32	390K	390k		read from the schematic by eye
R33	330	330		read from the schematic by eye
R34	2.7K	2.7k		read from the schematic by eye
R35	10K	10k		read from the schematic by eye
R37	13K	13k		read from the schematic by eye
R38	22K	22k		read from the schematic by eye
R39	120K	120k		read from the schematic by eye
R40	6.8K	6.8k		read from the schematic by eye
R41	220	220		read from the schematic by eye
R42	820K	820k		read from the schematic by eye
R43	1K	1k		read from the schematic by eye
R44	330K	330k		read from the schematic by eye
R45	470	470		read from the schematic by eye
R46	3.3K	3.3k		sheet 2; read from the schematic by eye
R47	3.3K	3.3k		sheet 2; read from the schematic by eye
R48	10K	10k		sheet 2; read from the schematic by eye
R49	220	220		sheet 2; read from the schematic by eye
R50	6.8K	6.8k		sheet 2; read from the schematic by eye
R51	10K	10k		sheet 2; read from the schematic by eye
R52	220	220		sheet 2; read from the schematic by eye
R53	47K	47k		sheet 2; read from the schematic by eye
R54	47K	47k		sheet 2; read from the schematic by eye
R55	3.9K	3.9k		sheet 2; read from the schematic by eye
R56	47K	47k		sheet 2; read from the schematic by eye
R57	27K	27k		sheet 2; read from the schematic by eye
R58	470	470		sheet 2; read from the schematic by eye
R59	470	470		sheet 2; read from the schematic by eye
R60	27K	27k		sheet 2; read from the schematic by eye
R62	12K	12k		sheet 2; read from the schematic by eye
R63	10K	10k		sheet 2; read from the schematic by eye
R64	10K	10k		sheet 2; read from the schematic by eye
R66	3.3K	3.3k		sheet 2; read from the schematic by eye
R67	820	820		sheet 2; read from the schematic by eye
R68	1K	1k		sheet 2; read from the schematic by eye
R69	12K	12k		sheet 2; read from the schematic by eye
R70	22M	22M		sheet 2; read from the schematic by eye
R71	680K	680k		sheet 2; read from the schematic by eye
R72	1K	1k		sheet 2; read from the schematic by eye
R73	2.2K	2.2k		sheet 2; read from the schematic by eye
R75	3.3K	3.3k		sheet 2; read from the schematic by eye
R76	8.2K	8.2k		sheet 2; read from the schematic by eye
R77	47K	47k		sheet 2; read from the schematic by eye
R78	1K	1k		sheet 2; read from the schematic by eye
R79	3.3K	3.3k		sheet 2; read from the schematic by eye
R80	8.2K	8.2k		sheet 2; read from the schematic by eye
R81	47K	47k		sheet 2; read from the schematic by eye
R82	1K	1k		sheet 2; read from the schematic by eye
R83	3.3K	3.3k		sheet 2; read from the schematic by eye
R84	8.2K	8.2k		sheet 2; read from the schematic by eye
R85	47K	47k		sheet 2; read from the schematic by eye
R87	330K	330k		sheet 2; read from the schematic by eye
R88	47K	47k		sheet 2; read from the schematic by eye
R89	4.7K	4.7k		sheet 2; read from the schematic by eye
R90	1K	1k		sheet 2; read from the schematic by eye
R91	470	470		sheet 2; read from the schematic by eye
R93	3.3K	3.3k		sheet 2; read from the schematic by eye
R94	820	820		sheet 2; read from the schematic by eye
R95	4.7K	4.7k		sheet 2; read from the schematic by eye
R96	47K	47k		sheet 2; read from the schematic by eye
R97	1K	1k		sheet 2; read from the schematic by eye
R98	47K	47k		sheet 2; read from the schematic by eye
R99	47	47		sheet 2; read from the schematic by eye
R100	22K	22k		sheet 2; read from the schematic by eye
R102	8.2K	8.2k		sheet 2; read from the schematic by eye
R103	820	820		sheet 2; read from the schematic by eye
R104	1K	1k		sheet 2; read from the schematic by eye
R105	1K	1k		sheet 2; read from the schematic by eye
R106	15K	15k		sheet 3; read from the schematic by eye
R107	5.6K	5.6k		sheet 3; read from the schematic by eye
R108	1K	1k		sheet 3; read from the schematic by eye
R109	12K	12k		sheet 3; read from the schematic by eye
R110	4.7K	4.7k		sheet 3; read from the schematic by eye
R111	680	680		sheet 3; read from the schematic by eye
Capacitors 33
C1	0.1uF	100n		drawn 0.1 (sheet note: all values in uF); read from the schematic by eye
C2	0.022uF	22n		drawn 0.022 (sheet note: all values in uF); read from the schematic by eye
C3	0.0022uF	2.2n		drawn 0.0022 (sheet note: all values in uF); read from the schematic by eye
C4	0.47uF	470n		tantalum; drawn 0.47 (sheet note: all values in uF); read from the schematic by eye
C5	0.0018uF	1.8n		drawn 0.0018 (sheet note: all values in uF); read from the schematic by eye
C6	1.0uF	1u		drawn 1.0 (sheet note: all values in uF); read from the schematic by eye
C7	4.7uF	4.7u		tantalum; drawn 4.7 (sheet note: all values in uF); read from the schematic by eye
C8	2.2uF	2.2u		drawn 2.2 (sheet note: all values in uF); read from the schematic by eye
C9	1.0uF	1u		drawn 1.0 (sheet note: all values in uF); read from the schematic by eye
C10	0.1uF	100n		drawn 0.1 (sheet note: all values in uF); read from the schematic by eye
C11	1.0uF	1u		tantalum; drawn 1.0 (sheet note: all values in uF); read from the schematic by eye
C12	0.47uF	470n		tantalum; drawn 0.47 (sheet note: all values in uF); read from the schematic by eye
C13	0.082uF	82n		drawn 0.082 (sheet note: all values in uF); read from the schematic by eye
C14	1.0uF	1u		drawn 1.0 (sheet note: all values in uF); read from the schematic by eye
C15	0.047uF	47n		drawn 0.047 (sheet note: all values in uF); read from the schematic by eye
C16	4.7uF	4.7u		drawn 4.7 (sheet note: all values in uF); read from the schematic by eye
C17	0.0033uF	3.3n		sheet 2; drawn 0.0033 (sheet note: all values in uF); read from the schematic by eye
C18	0.1uF	100n		sheet 2; drawn 0.1 (sheet note: all values in uF); read from the schematic by eye
C19	4.7uF	4.7u		tantalum; sheet 2; drawn 4.7 (sheet note: all values in uF); read from the schematic by eye
C20	4.7uF	4.7u		tantalum; sheet 2; drawn 4.7 (sheet note: all values in uF); read from the schematic by eye
C21	0.1uF	100n		sheet 2; drawn 0.1 (sheet note: all values in uF); read from the schematic by eye
C22	0.0033uF	3.3n		sheet 2; drawn 0.0033 (sheet note: all values in uF); read from the schematic by eye
C23	1.0uF	1u		sheet 2; drawn 1.0 (sheet note: all values in uF); read from the schematic by eye
C24	0.082uF	82n		sheet 2; drawn 0.082 (sheet note: all values in uF); read from the schematic by eye
C25	0.0033uF	3.3n		sheet 2; drawn 0.0033 (sheet note: all values in uF); read from the schematic by eye
C26	0.0033uF	3.3n		sheet 2; drawn 0.0033 (sheet note: all values in uF); read from the schematic by eye
C27	0.0033uF	3.3n		sheet 2; drawn 0.0033 (sheet note: all values in uF); read from the schematic by eye
C28	10uF	10u		tantalum; sheet 2; drawn 10 (sheet note: all values in uF); read from the schematic by eye
C29	1.0uF	1u		tantalum; sheet 2; drawn 1.0 (sheet note: all values in uF); read from the schematic by eye
C30	10uF	10u		tantalum; sheet 2; drawn 10 (sheet note: all values in uF); read from the schematic by eye
C31	100uF	100u		35V electrolytic; sheet 3; drawn 100 (sheet note: all values in uF); read from the schematic by eye
C32	10uF	10u		25V electrolytic; sheet 3; drawn 10 (sheet note: all values in uF); read from the schematic by eye
C33	10uF	10u		25V electrolytic; sheet 3; drawn 10 (sheet note: all values in uF); read from the schematic by eye
Diodes 22
D1	1N914	1N914		read from the schematic by eye
D2	1N914	1N914		read from the schematic by eye
D3	1N914	1N914		read from the schematic by eye
D4	1N914	1N914		read from the schematic by eye
D5	1N914	1N914		read from the schematic by eye
D6	1N914	1N914		read from the schematic by eye
D7	1N914	1N914		read from the schematic by eye
D8	1N914	1N914		read from the schematic by eye
D9	1N914	1N914		read from the schematic by eye
D10	1N914	1N914		read from the schematic by eye
D11	1N914	1N914		read from the schematic by eye
D12	1N914	1N914		sheet 2; read from the schematic by eye
D13	1N914	1N914		sheet 2; read from the schematic by eye
D14	1N914	1N914		sheet 2; read from the schematic by eye
D15	1N914	1N914		sheet 2; read from the schematic by eye
D16	1N914	1N914		sheet 2; read from the schematic by eye
D17	1N5235	1N5235 / 6V8		6.8V zener; sheet 2; read from the schematic by eye
D18	1N5235	1N5235 / 6V8		6.8V zener; sheet 2; read from the schematic by eye
D19	1N914	1N914		sheet 2; read from the schematic by eye
D21	1N961B	1N961B / 10V		10V zener; sheet 3; read from the schematic by eye
D22	1N914	1N914		sheet 3; read from the schematic by eye
BR1	W02M	W02M		bridge rectifier, power supply sheet 3; read from the schematic by eye
Transistors 7
Q1	2N5087	2N5087		read from the schematic by eye
Q2	2N4302	2N4302		JFET; sheet 2; read from the schematic by eye
Q3	2N5087	2N5087		sheet 2; read from the schematic by eye
Q4	2N5088	2N5088		sheet 2; read from the schematic by eye
Q5	2N5088	2N5088		sheet 2; designator Q5 reused on sheet 3 for the 2N6110; read from the schematic by eye
PS-Q5	2N6110	2N6110		printed Q5 on sheet 3 (power supply pass transistor); clashes with Q5 2N5088 on sheet 2; read from the schematic by eye
Q6	2N5088	2N5088		sheet 2; read from the schematic by eye
ICs 18
A1	RC4558	RC4558		dual op amp, power supply rail splitter (sheet 3); read from the schematic by eye
A2	RC4558	RC4558		dual op amp; read from the schematic by eye
A3	RC4558	RC4558		dual op amp; read from the schematic by eye
A4	RC4558	RC4558		dual op amp; read from the schematic by eye
A5	RC4558	RC4558		dual op amp; read from the schematic by eye
A6	RC4558	RC4558		dual op amp; read from the schematic by eye
A7	RC4558	RC4558		dual op amp; read from the schematic by eye
A8	CA3094	CA3094		OTA, or EH1040; read from the schematic by eye
A9	RC4558	RC4558		drawn U9A (sheet 2); read from the schematic by eye
A10	CA3094	CA3094		OTA, or EH1040 (VCF, sheet 2); read from the schematic by eye
A11	CA3094	CA3094		OTA, or EH1040 (VCF, sheet 2); read from the schematic by eye
A12	CA3094	CA3094		OTA, or EH1040 (VCF, sheet 2); read from the schematic by eye
A13	CA3094	CA3094		OTA, or EH1040 (sheet 2); read from the schematic by eye
A14	CA3094	CA3094		OTA, or EH1040 (VCA, sheet 2); read from the schematic by eye
A15	RC4558	RC4558		dual op amp (sheet 2); read from the schematic by eye
A16	RC4558	RC4558		dual op amp (sheet 2); read from the schematic by eye
A17	CD4013	CD4013		dual flip-flop, divide by two (sheet 2); read from the schematic by eye
A18	CA3094	CA3094		OTA, or EH1040 (sub-octave modulator, sheet 2); read from the schematic by eye
Potentiometers 10
Guitar	B100K	B100k	Potentiometer	R6, drawn 100K LIN (sheet 1); read from the schematic by eye
Octave	B100K	B100k	Potentiometer	R28, drawn 100K LIN (sheet 1); read from the schematic by eye
Trigger	B100K	B100k	Potentiometer	R31, drawn 100K LIN (sheet 1); read from the schematic by eye
Square Wave	B100K	B100k	Potentiometer	R36, drawn 100K LIN (sheet 1); read from the schematic by eye
Sub-Octave	B100K	B100k	Potentiometer	R61, drawn 100K LIN (sheet 2); read from the schematic by eye
Stop Frequency	B100K	B100k	Potentiometer	R65, drawn 100K LIN (sheet 2); read from the schematic by eye
Sweep Rate	B100K	B100k	Potentiometer	R74, drawn 100K LIN (sheet 2); read from the schematic by eye
Resonance	B100K	B100k	Potentiometer	R86, drawn 100K LIN (sheet 2); read from the schematic by eye
Start Frequency	B100K	B100k	Potentiometer	R92, drawn 100K LIN (sheet 2); read from the schematic by eye
Attack Delay	B100K	B100k	Potentiometer	R101, drawn 100K LIN (sheet 2); read from the schematic by eye
Trimmers 2
R3	10K	10k		Pre-Amp Gain (sheet 1); read from the schematic by eye
R14	100K	100k		Squelch (sheet 1); read from the schematic by eye
LEDs 1
D20	LED	LED		power indicator, sheet 3; read from the schematic by eye