HardLabs

3320-VCF

DIYSynthMNL·Eurorack-3320-VCF·kicad/3320-VCF.kicad_pcb

3320-VCF PCB layout, top view — open source board by DIYSynthMNL

About the 3320-VCF PCB

3320-VCF is an open source PCB design by DIYSynthMNL, published on GitHub. It is a 2-layer board measuring 30.5 × 112.3 mm, with 63 components from 32 distinct parts.

Other key parts include the TL072, AS3320 and TL074. By type, the board carries 31 resistors, 12 capacitors, 8 connectors, 3 ICs and 2 diodes.

It belongs with the audio designs in this gallery.

From the project

A VCF based on the AS3320 VCF Chip

A Eurorack 4-pole low-pass voltage-controlled filter based on the AS3320 chip from Electric Druid — a high-performance 4-pole VCF (CEM3372 family). 12-octave cutoff sweep range and voltage-controlled resonance from zero to oscillation.

- 4-pole (24 dB/oct) low-pass response using all four AS3320 filter stages - 12-octave cutoff range with smooth exponential control - Voltage-controlled resonance — from zero to self-oscillation - Cutoff frequency controlled by a panel pot + CV input with attenuation - Resonance controlled by a panel pot + CV input with attenuation - Three calibration trims: -…

3320-VCF, from the project README
From the project README

Main components on the 3320-VCF

TL072AS3320TL074

3320-VCF bill of materials (BOM)

63 components, 32 distinct parts.

QtyPartRefs
1
TL072
U1
1
AS3320
U2
1
TL074
U3
1
Sig In
J1
1
Sig Out
J2
1
FreqCv
J3
1
ResCv
J4
1
EuroPower_JST_3P
J5
1
EURO_PWR_16P
J6
1
Main
J7
1
Ctrl
J8
1
2K
RV1
2
50K
RV2, RV5
2
100K
RV3, RV6
2
10K
RV4, RV7
2
~
D1, D2
2
2.2uF
C1, C2
4
270pF
C3, C4, C5, C6
4
100nF
C7, C8, C10, C11
2
22uF
C9, C12
Show 12 more
QtyPartRefs
13
100K
R1, R3, R5, R7, R9, R16, R20, R21 +5
4
91K
R2, R4, R6, R8
1
1K
R10
3
68K
R11, R19, R25
3
220K
R12, R13, R14
1
330K
R15
1
51K
R17
1
3K3
R18
1
1K2
R22
1
1K8
R23
1
150K
R29
1
3.3K
R30

3320-VCF design files

The KiCad project lives in the DIYSynthMNL/Eurorack-3320-VCF repository on GitHub; these links point at the commit this page was built from.

3320-VCF: common questions

How big is the 3320-VCF PCB?

The 3320-VCF measures 30.5 × 112.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 3320-VCF?

63 components, from 32 distinct parts. The full bill of materials is listed on this page.

Where can I download the 3320-VCF design files?

From the DIYSynthMNL/Eurorack-3320-VCF repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the 3320-VCF 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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