Enclosure not stated · 5 knobs

Gakken SX-150

Category: Ring Mod / Synth· Full Synths Drum Synths and Misc Synth
Controls: Decay · Attack · Pitch Env · LFO Rate · Cutoff
Price: see vendor
Tags: Full Synths Drum Synths and Misc Synth

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Schematic

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Parts list 101 rows

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

R41: may be the Resonance control rather than a fixed resistor
SW3: read as DP3T (off/low/high)
C2, C19, C21, R46 and the Zobel cap have no values on the drawing

Ref	Value	Normalized	Type	Notes
Resistors 53
R1	6k8	6.8k		read from the schematic by eye
R2	4k7	4.7k		read from the schematic by eye
R3	22k	22k		read from the schematic by eye
R4	33k	33k		read from the schematic by eye
R5	75k	75k		read from the schematic by eye
R6	4k7	4.7k		read from the schematic by eye
R7	1M	1M		read from the schematic by eye
R8	68k	68k		read from the schematic by eye
R9	100k	100k		read from the schematic by eye
R10	6k8	6.8k		read from the schematic by eye
R11	100k	100k		read from the schematic by eye
R12	6k8	6.8k		read from the schematic by eye
R13	220k	220k		read from the schematic by eye
R14	6k8	6.8k		read from the schematic by eye
R15	1k2	1.2k		read from the schematic by eye
R16	150k	150k		read from the schematic by eye
R17	33k	33k		read from the schematic by eye
R18	2k2	2.2k		read from the schematic by eye
R19	22k	22k		read from the schematic by eye
R20	18k	18k		read from the schematic by eye
R21	33k	33k		read from the schematic by eye
R22	4k7	4.7k		read from the schematic by eye
R23	1k	1k		read from the schematic by eye
R24	10k	10k		read from the schematic by eye
R25	22k	22k		read from the schematic by eye
R26	100k	100k		read from the schematic by eye
R27	22k	22k		read from the schematic by eye
R28	22k	22k		read from the schematic by eye
R29	100R	100		read from the schematic by eye
R30	2k2	2.2k		read from the schematic by eye
R31	68k	68k		read from the schematic by eye
R32	56k	56k		read from the schematic by eye
R33	100k	100k		read from the schematic by eye
R34	33k	33k		read from the schematic by eye
R35	1k	1k		read from the schematic by eye
R36	1M	1M		read from the schematic by eye
R37	10k	10k		read from the schematic by eye
R38	47k	47k		read from the schematic by eye
R39	1k	1k		read from the schematic by eye
R40	2k2	2.2k		read from the schematic by eye
R41	10k	10k		drawn as a fixed resistor beside the Resonance switch; read from the schematic by eye
R42	4k7	4.7k		read from the schematic by eye
R43	6k8	6.8k		read from the schematic by eye
R44	2k2	2.2k		read from the schematic by eye
R45	10k	10k		read from the schematic by eye
R46	?	?		no value given (Zobel resistor at LM386 output); read from the schematic by eye
R47	6k8	6.8k		read from the schematic by eye
R48	22k	22k		read from the schematic by eye
R49	22k	22k		read from the schematic by eye
R50	100k	100k		read from the schematic by eye
R51	75k	75k		read from the schematic by eye
R52	75k	75k		read from the schematic by eye
R53	1k	1k		read from the schematic by eye
Capacitors 21
C1	220n	220n		read from the schematic by eye
C2	?	?		drawn '???'; read from the schematic by eye
C3	10n	10n		read from the schematic by eye
C4	10n	10n		read from the schematic by eye
C5	10u	10u		read from the schematic by eye
C6	4u7	4.7u		read from the schematic by eye
C7	10n	10n		read from the schematic by eye
C8	47u	47u		read from the schematic by eye
C9	10n	10n		read from the schematic by eye
C10	1n	1n		read from the schematic by eye
C11	1u	1u		read from the schematic by eye
C12	10u	10u		read from the schematic by eye
C13	10u	10u		read from the schematic by eye
C15	220u	220u		read from the schematic by eye
C16	100n	100n		read from the schematic by eye
C17	4u7	4.7u		read from the schematic by eye
C18	4u7	4.7u		read from the schematic by eye
C19	?	?		electrolytic, no value given; read from the schematic by eye
C20	100u	100u		read from the schematic by eye
C21	?	?		no value given; read from the schematic by eye
×1	?	?		Zobel capacitor at LM386 output, no designator or value; read from the schematic by eye
Diodes 8
D7	Diode	DIODE		no part number given; read from the schematic by eye
D8	Diode	DIODE		no part number given; read from the schematic by eye
D9	Diode	DIODE		no part number given; read from the schematic by eye
D10	Diode	DIODE		no part number given; read from the schematic by eye
D11	Diode	DIODE		no part number given; read from the schematic by eye
D12	Diode	DIODE		no part number given; read from the schematic by eye
D13	Diode	DIODE		no part number given; read from the schematic by eye
D14	Diode	DIODE		no part number given; read from the schematic by eye
Transistors 5
Q1	?	?		NPN, no part number given; read from the schematic by eye
Q2	?	?		NPN, no part number given (exponential converter); read from the schematic by eye
Q3	?	?		NPN, no part number given; read from the schematic by eye
Q4	?	?		NPN, no part number given; read from the schematic by eye
Q5	?	?		NPN, no part number given; read from the schematic by eye
ICs 5
IC1	NJM2902	NJM2902		quad op amp, sections IC1A-IC1D; printed 'NJN2902'; read from the schematic by eye
IC2	NJM2902	NJM2902		quad op amp, sections IC2A-IC2D; printed 'NJN2902'; read from the schematic by eye
IC3	555	555		read from the schematic by eye
IC4	386	386		LM386 power amp; read from the schematic by eye
U1	?	?		5V regulator, no part number given; read from the schematic by eye
Potentiometers 5
Decay	100k	100k	Potentiometer	VR1; read from the schematic by eye
Attack	100k	100k	Potentiometer	VR2; read from the schematic by eye
Pitch Env	50k	50k	Potentiometer	VR3; read from the schematic by eye
LFO Rate	50k	50k	Potentiometer	VR4; read from the schematic by eye
Cutoff	50k	50k	Potentiometer	VR5; read from the schematic by eye
Switches 3
LFO Wave	SPDT	SPDT		K1; read from the schematic by eye
Resonance	SPDT	SPDT		SW; read from the schematic by eye
Power	DP3T	DP3T		SW3: off / low / high volume; read from the schematic by eye
LEDs 1
LED	LED	LED		'SW SPOT' indicator; read from the schematic by eye