2 layers100 × 61 mm
Wgr
a5632645/final_design
simple digital waveguide synthesizer & simple mpe midi keyboard(pitch bend and pressure)
103 parts4
2 layers50 × 75 mm
Modwheel
a5632645/final_design4simple digital waveguide synthesizer & simple mpe midi keyboard(pitch bend and pressure)
- Size
- 50 × 75 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 20
- Nets
- 25
- Pads
- 146
- Tracks, vias
- 146, 15
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 23 May 2025
- Updated
- 23 Oct 2025
Overview
Modwheel is an open-source printed circuit board by a5632645, from the a5632645/final_design repository on GitHub. It is a 2-layer board of 50 × 75 mm with 20 parts on 25 nets, routed with 146 tracks and 15 vias.
It is built around the MPR121QR2. Its parts include 6 resistors, 5 connectors, 2 capacitors, 2 switches and 1 IC. It belongs with the audio and music boards of this library.
Main components
1README
README.mdfinal_design/毕业设计
This is my final design.
这是我的本科毕业设计.
[!WARNING] don't try to rebuild hardware, it has too many incorrect design, that will just waste your time and money.
请不要试着复刻硬件，有很多设计不合理的地方，复刻只会浪费你的时间和钱
digital waveguide synthesizer/数字波导合成器
This is a MPE capability digital waveguide synthesizer.It has plucked, woodwind and bowed engine.Or you can use it as a MPE midi keyboard(only one octave).
这是一个mpe兼容的数字波导合成器，有拨弦，木管和弓弦模型，也可以当成mpe键盘使用，尽管只有一个八度。
demo/演示
https://www.bilibili.com/video/BV1ghJGzJEi4/
bug
硬件中含有较多问题
the hardware has many bugs.
Parts
20| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 10k | PCM_Resistor_SMD_AKL:R_0603_1608Metric | R3, R4, R5, R6 |
| 4 | MountingHole_M3 | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | Conn_01x04 | footprint:SM04BSRSSTB | J3, J4, J5 |
| 2 | 100nF | PCM_Capacitor_SMD_AKL:C_0603_1608Metric | C1, C2 |
| 2 | R_Small | PCM_Resistor_SMD_AKL:R_0603_1608Metric | R1, R2 |
| 1 | MPR121QR2 | Package_DFN_QFN:UQFN-20_3x3mm_P0.4mm | U1 |
| 1 | ModWheel | 1MyLibrary:TouchSlider-6_50x10mm | J1 |
| 1 | OCT+ | 1MyLibrary:KEY-SMD_2P-L6.0-W6.0-P6.00 | SW1 |
| 1 | OCT- | 1MyLibrary:KEY-SMD_2P-L6.0-W6.0-P6.00 | SW2 |
| 1 | PitchBend | 1MyLibrary:TouchSlider-6_50x10mm | J2 |
Questions
How big is the Modwheel PCB?
It measures 50 × 75 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Modwheel use?
20 parts, built around the MPR121QR2. 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 Modwheel KiCad files?
From the a5632645/final_design repository on GitHub, at the commit this page was made from: the board is modwheel/modwheel.kicad_pcb and its schematic keyboard/keyboard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Modwheel design in my own project?
Its repository states no licence, so its author keeps all rights: ask a5632645 before reusing the design.
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