HardLabs

3320VCF

hermflink·3320VCF

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

About the 3320VCF PCB

3320VCF is an open source PCB design by hermflink, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 94.5 × 55 mm, with 75 components from 25 distinct parts.

Other key parts include the TL074, TL072 and AS3320. By type, the board carries 36 resistors, 14 capacitors, 5 connectors, 5 switches, 3 ICs and 2 fuses.

It belongs with the audio designs in this gallery.

From the project

Kicad project files of a CEM/AS3320 based VCF

Used the Audio.lib from https://kicad.github.io/symbols/Audio to extend the Kicad library for the AS3320 component.

Designed to work with +/- 15V, but will most likely work fine for +/- 12V as well

The PCB is 9.5 x 5.5 cm and has no PCB-mounting of potmeters, switches, jacks; these are all connected by pin header connectors

Stages 1 and 2 are switchable between HP and LP mode by SW1 and SW2. Stages 3 and 4 are fixed on LP mode. These allow for the following filter modes: - A: 24dB LP - B: 12dB BP - C: 6dB HP + 18dB LP - D: 6dB LP + 6dB HP + 12dB LP

Main components on the 3320VCF

TL074TL072AS3320

3320VCF bill of materials (BOM)

75 components, 25 distinct parts.

QtyPartRefs
1
TL074
U1
1
TL072
U2
1
AS3320
U3
2
CONN_01X04
J1, J3
2
CONN_01X02
J2, J4
1
CONN_01X03_MALE
J5
2
100mA
F1, F2
6
100K
RV1, RV3, RV4, RV5, RV6, RV7
1
20K
RV8
1
2K
RV9
5
SW_3PDT
SW1a1, SW1b1, SW2a1, SW2b1, SW2c1
2
1uH
L1, L2
4
10uF
C1, C6, C11, C12
4
150pF
C2, C3, C4, C5
2
33p
C7, C8
2
100n
C9, C10
2
100nF
C13, C14
1
150k
R1
16
100k
R2, R7, R8, R10, R11, R12, R13, R14 +8
1
300k
R4
Show 5 more
QtyPartRefs
8
51k
R5, R6, R9, R15, R16, R22, R34, R38
1
33K
R19
4
91K
R20, R24, R26, R29
3
220K
R21, R23, R30
2
1K
R27, R36

3320VCF design files

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

3320VCF: common questions

How big is the 3320VCF PCB?

The 3320VCF measures 94.5 × 55 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 3320VCF?

75 components, from 25 distinct parts. The full bill of materials is listed on this page.

Where can I download the 3320VCF design files?

From the hermflink/3320VCF repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the 3320VCF design in my own project?

Yes, under the terms of its GPL-3.0 license, which hermflink chose for the repository.

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