2 layers160 × 100 mm
CLOCK
Desval27/FormantKO
Knock-off of the Elektor Formant Synthesizer project with the initial goal of being quasi-authentic and secondary goal undecided. Probably tweaks of some kind.
135 partsMIT
2 layers160 × 100 mm
Knock-off of the Elektor Formant Synthesizer project with the initial goal of being quasi-authentic and secondary goal undecided. Probably tweaks of some kind.
- Size
- 160 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 85
- Nets
- 60
- Pads
- 221
- Tracks, vias
- 490, 8
- Pours
- 20
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 13 May 2026
- Updated
- 28 Aug 2026
Overview
COM is an open-source printed circuit board by Desval27, from the Desval27/FormantKO repository on GitHub, published under the MIT licence. It is a 2-layer board of 160 × 100 mm with 85 parts on 60 nets, routed with 490 tracks and 8 vias.
It is built around the RC4136N. Its parts include 37 connectors, 26 resistors, 12 capacitors, 5 diodes and 1 IC. It belongs with the audio and music boards of this library.
Main components
1README
MFOS/panels/ANALOG/README.mdParts
85| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | GND | FormantKO:Wire_1x01_General | J15, J20, J22, J28, J32 |
| 4 | 6k8 | FormantKO:R_Axial_Horizontal | R5, R7, R11, R13 |
| 3 | 100k | FormantKO:PanelConnector_1x03 | P2, P3, P4 |
| 3 | 100n | FormantKO:C_Rect_300_400 | C1, C2, C9 |
| 3 | 150R | FormantKO:R_Axial_Horizontal | R21, R24, R27 |
| 3 | 470R | FormantKO:R_Axial_Horizontal | R3, R8, R18 |
| 3 | 680n | FormantKO:C_Rect_300_400 | C10, C11, C12 |
| 2 | 100k | FormantKO:R_Axial_Horizontal | R10, R12 |
| 2 | 10k | FormantKO:R_Axial_Horizontal | R25, R26 |
| 2 | 10n | FormantKO:C_Rect_300_400 | C3, C4 |
| 2 | 1k5 | FormantKO:R_Axial_Horizontal | R4, R6 |
| 2 | 220k | FormantKO:R_Axial_Horizontal | R15, R17 |
| 2 | 2N3904 | FormantKO:TO-92 | T1, T2 |
| 2 | 39n | FormantKO:C_Rect_300_400 | C5, C6 |
| 2 | 3k9 | FormantKO:R_Axial_Horizontal | R9, R14 |
| 2 | 680R | FormantKO:R_Axial_Horizontal | R20, R22 |
| 2 | 82k | FormantKO:R_Axial_Horizontal | R1, R2 |
| 1 | +15V LED | FormantKO:Wire_1x01_General | J24 |
| 1 | +15V LED | FormantKO:PanelConnector_1x02 | D3 |
| 1 | +5V LED | FormantKO:PanelConnector_1x02 | D2 |
| 1 | -15V | FormantKO:Wire_1x01_General | J21 |
| 1 | -15V LED | FormantKO:PanelConnector_1x02 | D1 |
| 1 | -15V LED | FormantKO:Wire_1x01_General | J25 |
| 1 | 15n | FormantKO:C_Rect_300_400 | C7 |
| 1 | 22k | FormantKO:R_Axial_Horizontal | R16 |
| 1 | 250k | FormantKO:Potentiometer_Trimmer_PinSwap | P5 |
| 1 | 3n3 | FormantKO:C_Rect_300_400 | C8 |
| 1 | 4k7 | FormantKO:PanelConnector_1x06 | P1 |
| 1 | 4k7 | FormantKO:R_Axial_Horizontal | R19 |
| 1 | 5V LED | FormantKO:Wire_1x01_General | J23 |
| 1 | CardBracket | FormantKO:CardBracket | MH1 |
| 1 | CardConnector | FormantKO:CardConnector | J1 |
| 1 | GATE1 LED | FormantKO:Wire_1x01_General | J26 |
| 1 | GATE1 LED | FormantKO:PanelConnector_1x02 | D4 |
| 1 | GATE2 LED | FormantKO:PanelConnector_1x02 | D5 |
| 1 | GATE2 LED | FormantKO:Wire_1x01_General | J27 |
| 1 | IS SELECT | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical | J2 |
| 1 | OUT 1 | FormantKO:Wire_1x01_General | J19 |
| 1 | OUT 1 | FormantKO:PanelConnector_1x02 | J5 |
| 1 | OUT 2 | FormantKO:Wire_1x01_General | J11 |
| 1 | OUT 2 | FormantKO:PanelConnector_1x02 | J6 |
| 1 | P1a.1 | FormantKO:Wire_1x01_General | J3 |
| 1 | P1a.2 | FormantKO:Wire_1x01_General | J4 |
| 1 | P1a.3 | FormantKO:Wire_1x01_General | J7 |
| 1 | P1b.1 | FormantKO:Wire_1x01_General | J16 |
| 1 | P1b.2 | FormantKO:Wire_1x01_General | J17 |
| 1 | P1b.3 | FormantKO:Wire_1x01_General | J18 |
| 1 | P2.1 | FormantKO:Wire_1x01_General | J8 |
| 1 | P2.2 | FormantKO:Wire_1x01_General | J9 |
| 1 | P2.3 | FormantKO:Wire_1x01_General | J10 |
| 1 | P3.1 | FormantKO:Wire_1x01_General | J12 |
| 1 | P3.2 | FormantKO:Wire_1x01_General | J13 |
| 1 | P3.3 | FormantKO:Wire_1x01_General | J14 |
| 1 | P4.1 | FormantKO:Wire_1x01_General | J29 |
| 1 | P4.2 | FormantKO:Wire_1x01_General | J30 |
| 1 | P4.3 | FormantKO:Wire_1x01_General | J31 |
| 1 | RC4136 | FormantKO:DIP-14 | IC1 |
| 1 | TestPoint | FormantKO:KEYSTONE_5001 | TP1 |
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Questions
How big is the COM PCB?
It measures 160 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the COM use?
85 parts, built around the RC4136N. 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 COM KiCad files?
From the Desval27/FormantKO repository on GitHub, at the commit this page was made from: the board is modules/COM/COM.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the COM design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).