Eurorack-3340-VCO

DIYSynthMNL·Eurorack-3340-VCO·kicad/3340_main_board.kicad_sch

This repository ships a schematic but no board layout.

About the Eurorack-3340-VCO PCB

Eurorack-3340-VCO is an open source PCB design by DIYSynthMNL, published on GitHub. It is a board, with 70 components from 28 distinct parts.

Other key parts include the TL074, 78M05 and 79M05. By type, the board carries 39 resistors, 18 capacitors, 4 ICs, 4 diodes and 2 connectors.

It belongs with the audio designs in this gallery.

From the project

A VCO using the AS3340 chip

A Eurorack VCO module based on the AS3340 chip from Electric Druid — a drop-in clone of the classic Curtis CEM3340. Analog 1V/oct tracking with simultaneous saw, triangle, sine, and pulse outputs.

- 1V/oct tracking with two summed V/oct CV inputs (use both for transpose/unison) - Course tune with jumper-selectable range (narrow / wide via JP1) plus Fine tune pot - Linear FM input with attenuator pot (Lin FM, ±5V CV) - PWM input with amount attenuator (±5V CV), feeds the chip's pulse-width modulator - Hard / Soft Sync input with panel switch for selection (AC-coupled, 1 nF) - Four…

Main components on the Eurorack-3340-VCO

TL074 78M05 79M05

Eurorack-3340-VCO bill of materials (BOM)

70 components, 28 distinct parts.

Qty	Part	Footprint	Refs
2	TL074	DIP-14_W7.62mm_LongPads	U1, U2
1	78M05	TO-252-2	U3
1	79M05	TO-252-2	U4
1	EuroPower_JST_3P	Eurorack_power_jst_3P	J10
1	EURO_PWR_16P	IDC-Header_2x08_P2.54mm_Vertical	J11
1	10K	Potentiometer_Bourns_3296W_Vertical_BigPads	RV1
2	2K	Potentiometer_Bourns_3296W_Vertical_BigPads	RV6, RV7
2	4148	D_4148_BigPads	D1, D2
2	~	D_DO-41_SOD81_P7.62mm_Horizontal_BigPads	D3, D4
7	100nF	C_Rect_L7.0mm_W2.0mm_P5.00mm_BigPads	C1, C2, C4, C7, C13, C14, C17
3	10pF	C_Disc_D3.0mm_W2.0mm_P2.50mm	C3, C8, C10
2	10nF	C_Rect_L7.0mm_W2.0mm_P5.00mm_BigPads	C5, C9
4	2.2uF	CP_Radial_D5.0mm_P2.50mm	C11, C12, C16, C18
2	22uF	CP_Radial_D4.0mm_P1.50mm	C15, C19
2	1M5	R_quarter_watt_L6.3mm_D2.5mm_P7.62mm	R1, R15
2	5K6	R_quarter_watt_L6.3mm_D2.5mm_P7.62mm	R2, R17
2	470R	R_quarter_watt_L6.3mm_D2.5mm_P7.62mm	R3, R6
11	100K	R_quarter_watt_L6.3mm_D2.5mm_P7.62mm	R4, R8, R9, R11, R12, R13, R18, R21 +3
5	1K	R_quarter_watt_L6.3mm_D2.5mm_P7.62mm	R5, R25, R29, R30, R34
4	91K	R_quarter_watt_L6.3mm_D2.5mm_P7.62mm	R10, R24, R28, R38

Show 8 more

Qty	Part	Footprint	Refs
2	47K	R_quarter_watt_L6.3mm_D2.5mm_P7.62mm	R14, R26
1	220K	R_quarter_watt_L6.3mm_D2.5mm_P7.62mm	R16
1	1K8	R_quarter_watt_L6.3mm_D2.5mm_P7.62mm	R19
4	240K	R_quarter_watt_L6.3mm_D2.5mm_P7.62mm	R20, R23, R27, R37
1	150K	R_quarter_watt_L6.3mm_D2.5mm_P7.62mm	R31
1	22K	R_quarter_watt_L6.3mm_D2.5mm_P7.62mm	R32
1	180K	R_quarter_watt_L6.3mm_D2.5mm_P7.62mm	R33
2	*10K	R_quarter_watt_L6.3mm_D2.5mm_P7.62mm	R39, R40

Eurorack-3340-VCO design files

The KiCad project lives in the DIYSynthMNL/Eurorack-3340-VCO repository on GitHub; these links point at the commit this page was built from.

Schematickicad/3340_main_board.kicad_sch

Eurorack-3340-VCO: common questions

How many components are on the Eurorack-3340-VCO?

70 components, from 28 distinct parts. The full bill of materials is listed on this page.

Where can I download the Eurorack-3340-VCO design files?

From the DIYSynthMNL/Eurorack-3340-VCO repository on GitHub, which has the schematic; the links under Design files point to each one.

Can I use the Eurorack-3340-VCO design in my own project?

The repository has no license, so all rights stay with DIYSynthMNL. Use it as a reference, and ask the author before reusing the design.

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