2 layers63.5 × 112.3 mm
2 layers94.5 × 55 mm
Kicad project files of a CEM/AS3320 based VCF
- Size
- 94.5 × 55 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 79
- Nets
- 61
- Pads
- 206
- Tracks, vias
- 868, 39
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 28 May 2019
- Updated
- 8 Nov 2019
Overview
Vcf1 is an open-source printed circuit board by hermflink, from the hermflink/3320VCF repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 94.5 × 55 mm with 79 parts on 61 nets, routed with 868 tracks and 39 vias.
It is built around the TL072 and AS3320. Its parts include 36 resistors, 14 capacitors, 5 connectors, 5 switches and 3 ICs. It belongs with the audio and music boards of this library.
Main components
2README
README.md3320VCF
Kicad project files of a CEM3320/AS3320 based VCF. Part of a modular DIY synth project, other modules to follow in other repositories.
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
Background of the mode configurations: https://electricdruid.net/multimode-filters-part-1-reconfigurable-filters/ section Craig Anderton’s Multiple Identity Filter.
Capacitors on pin 4, 5, 11 and 16 should be 1% or less tolerance!
F1 and F2 fuses are not really required and can be replaced by shorts.
Parts
79| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | 100k | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R2, R7, R8, R10, R11, R12, R13, R14, R17, R18, R28, R31, R32, R33, R35, R37 |
| 8 | 51k | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R5, R6, R9, R15, R16, R22, R34, R38 |
| 5 | 100K | Potentiometers:Potentiometer_WirePads_Small | RV1, RV3, RV4, RV6, RV7 |
| 5 | SW_3PDT | Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm | SW1a1, SW1b1, SW2a1, SW2b1, SW2c1 |
| 4 | 10uF | Capacitors_THT:CP_Radial_D5.0mm_P2.00mm | C1, C6, C11, C12 |
| 4 | 150pF | Resistors_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P2.54mm_Vertical | C2, C3, C4, C5 |
| 4 | 1pin | Connectors:1pin | , , , |
| 4 | 91K | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R20, R24, R26, R29 |
| 3 | 220K | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R21, R23, R30 |
| 2 | 100mA | Capacitors_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | F1, F2 |
| 2 | 100n | Capacitors_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C9, C10 |
| 2 | 100nF | Capacitors_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C13, C14 |
| 2 | 1K | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R27, R36 |
| 2 | 1uH | Inductors_THT:L_Axial_L9.5mm_D4.0mm_P2.54mm_Vertical_Fastron_SMCC | L1, L2 |
| 2 | 33p | Capacitors_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C7, C8 |
| 2 | CONN_01X02 | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | J2, J4 |
| 2 | CONN_01X04 | Pin_Headers:Pin_Header_Straight_1x04_Pitch2.54mm | J1, J3 |
| 1 | 100k | Potentiometers:Potentiometer_WirePads_Small | RV5 |
| 1 | 150k | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R1 |
| 1 | 20K | Potentiometers:Potentiometer_Trimmer_Bourns_3296W | RV8 |
| 1 | 2K | Potentiometers:Potentiometer_Trimmer_Bourns_3296W | RV9 |
| 1 | 300k | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R4 |
| 1 | 33K | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R19 |
| 1 | AS3320 | Housings_DIP:DIP-18_W7.62mm_Socket | U3 |
| 1 | CONN_01X03_MALE | Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm | J5 |
| 1 | TL072 | Housings_DIP:DIP-8_W7.62mm_Socket | U2 |
| 1 | TL074 | Housings_DIP:DIP-14_W7.62mm_Socket | U1 |
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Questions
How big is the Vcf1 PCB?
It measures 94.5 × 55 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Vcf1 use?
79 parts, built around the TL072 and AS3320. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Vcf1 KiCad files?
From the hermflink/3320VCF repository on GitHub, at the commit this page was made from: the board is vcf1.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Vcf1 design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).