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
EXPANDER
Desval27/FormantKOKnock-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
- 77
- Nets
- 73
- Pads
- 218
- Tracks, vias
- 21, 0
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 13 May 2026
- Updated
- 28 Aug 2026
Overview
EXPANDER 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 77 parts on 73 nets, routed with 21 tracks and 0 vias.
Its parts include 27 resistors, 22 crystals, 12 capacitors, 4 ICs and 3 diodes. It belongs with the audio and music boards of this library.
README
MFOS/panels/ANALOG/README.mdParts
77| Qty | Value | Footprint | References |
|---|---|---|---|
| 22 | WireConnector | FormantKO:Wire_1x01_D40mil_OD80mil | X1, X2, X3, X10, X11, X12, X13, X14, X15, X16, X17, X18, X19, X20, X21, X22 +6 |
| 13 | 10k | FormantKO:R_Axial_Horizontal_P500mil | R1, R2, R3, R4, R5, R8, R9, R10, R11, R16, R23, R25, R29 |
| 6 | 100n | FormantKO:C_Rect_P200mil | C5, C6, C9, C10, C11, C12 |
| 3 | 100k | FormantKO:R_Axial_Horizontal_P500mil | R12, R21, R24 |
| 3 | 1N4148 | FormantKO:DO-35_P400mil | D1, D2, D3 |
| 3 | TL074 | FormantKO:DIP-14N | IC1, IC2, IC3 |
| 2 | 100R | FormantKO:R_Axial_Horizontal_P500mil | R7, R13 |
| 2 | 10µ | FormantKO:CP_Radial_P100mil | C1, C3 |
| 2 | 130k | FormantKO:R_Axial_Horizontal_P500mil | R18, R28 |
| 2 | 1N5231 | FormantKO:DO-35_P400mil | Z1, Z3 |
| 2 | 20k | FormantKO:R_Axial_Horizontal_P500mil | R17, R27 |
| 2 | 220n | FormantKO:C_Rect_P200mil | C2, C8 |
| 2 | 2k | FormantKO:R_Axial_Horizontal_P500mil | R19, R26 |
| 2 | type="" model="1N5231" lib="semiconductor.lib" | FormantKO:DO-35_P400mil | Z2, Z4 |
| 1 | 100k | FormantKO:Potentiometer_Trimmer_MultiTurn | R22 |
| 1 | 1M | FormantKO:R_Axial_Horizontal_P500mil | R20 |
| 1 | 1k | FormantKO:R_Axial_Horizontal_P500mil | R15 |
| 1 | 1µ | FormantKO:CP_Radial_P100mil | C4 |
| 1 | 2N3904 | FormantKO:TO-92_Wide | T1 |
| 1 | 40106 | FormantKO:DIP-14N | IC4 |
| 1 | 47p | FormantKO:C_Rect_P200mil | C7 |
| 1 | Card Bracket | FormantKO:Card_Bracket | MH1 |
| 1 | Card Connector | FormantKO:Card_Connector | J1 |
| 1 | GATE SELECT | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | J14 |
| 1 | KOV SELECT | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | J12 |
Questions
How big is the EXPANDER PCB?
It measures 160 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the EXPANDER use?
77 parts. 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 EXPANDER KiCad files?
From the Desval27/FormantKO repository on GitHub, at the commit this page was made from: the board is MFOS/modules/EXPANDER/EXPANDER.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the EXPANDER 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).
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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.
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