2 layers275.9 × 117.8 mm
Reform2-keyboard3
jackhumbert/reform
This is the main repository for the MNT Reform open source laptop.
379 parts1
4 layers58.5 × 50.3 mm
F407-mainboard
adrienles/miniMPEa sectioned small and low profile MPE MIDI keyboard
- Size
- 58.5 × 50.3 mm
- Copper layers
- 4
- Thickness
- 1.58 mm
- Parts
- 61
- Nets
- 108
- Pads
- 307
- Tracks, vias
- 648, 116
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 5 Dec 2025
- Updated
- 16 Jan 2026
Overview
F407-mainboard is an open-source printed circuit board by adrienles, from the adrienles/miniMPE repository on GitHub. It is a 4-layer board of 58.5 × 50.3 mm with 61 parts on 108 nets, routed with 648 tracks and 116 vias.
It is built around the STM32F407VET6, USBLC6-2SC6 and ME6211C33M5G-N, with the SY6280AAC, MH3 and MH4 among its other parts. Its parts include 27 capacitors, 11 resistors, 5 ICs, 4 connectors and 3 diodes. It belongs with the keyboards and input and audio and music boards and the STM32 boards of this library.
Main components
6
STM32F407VET6
LQFP-100(14x14)-40℃~+85℃ 1.8V~3.6V 12bit 12bit 168MHz 192KB 32 Bit 512KB 82 ARM Cortex-M4 Built-in FLASH LQFP-100(14x14) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
ME6211C33M5G-N
SOT-23-5-40℃~+150℃ 1 120mV@(100mA) 3.3V 500mA 50uVrms 60uA 6V 70dB@(1kHz) Fixed Over Current Protection、Enable、Short Circuit Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMICRONEVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsSY6280AAC
SOT-23-5-40℃~+125℃ 1 2.4V~5.5V 80mΩ Active High High Side Switch Overcurrent Protection(OCP)、Over Temperature Protection SOT-23-5 Power Distribution Switches ROHS矽力杰silergyPower Distribution SwitchesMH3
-Connector AccessoriesAmphenolMH4
-Connector AccessoriesAltech
README
README.mdminiMPE
An ultra-compact expressive octave-sectioned MIDI keyboard
Idea
Originally inspired by the KORG nanoKeys line of ultra-compact MIDI keyboards, I wanted to design an alternative, with a few improvements:
- Standard key width
- Velocity sensitivity
- The nanoKeys is not velocity sensitive, as it uses rubber-dome-like keys.
- RGB lighting for scale highlighting and pretty effects
- Daisy-chainable design, to go beyond a 2 octave design
- This will likely be done using magnetic pogo pin connectors, for an easy and durable connection.
- Open Source :)
Sub-projects
MCU Test Board
This is a 4-layer test PCB designed to test one of the chosen MCU picks, alongside its dual USB peripherals, which this project might utilize.
Specs
- STM32F407 MCU
- Dual USB peripherals
- IO header with dual SPI and 16 analog channels
- Dual USB ports
- Output is protected against over-voltage
- Impedance matched USB and digital signals
- 4-layer design (Signal - Power/Gnd - Gnd - Signal)
Parts
61| Qty | Value | Footprint | References |
|---|---|---|---|
| 13 | 100nF | Capacitor_SMD:C_0402_1005Metric | C2, C4, C5, C6, C7, C8, C9, C10, C11, C12, C17, C26, C27 |
| 4 | 10K | Resistor_SMD:R_0402_1005Metric | R5, R6, R12, R13 |
| 4 | 5.1K | Resistor_SMD:R_0402_1005Metric | R1, R2, R3, R4 |
| 2 | 10uF | Capacitor_SMD:C_0402_1005Metric | C22, C23 |
| 2 | 12pF | Capacitor_SMD:C_0402_1005Metric | C20, C21 |
| 2 | 1uF | Capacitor_SMD:C_0402_1005Metric | C24, C25 |
| 2 | 2.2uF | Capacitor_SMD:C_0603_1608Metric | C15, C16 |
| 2 | 7pF | Capacitor_SMD:C_0402_1005Metric | C18, C19 |
| 2 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U2, U3 |
| 1 | 1.1A Hold | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | 10nF | Capacitor_SMD:C_0402_1005Metric | C1 |
| 1 | 137R | Resistor_SMD:R_0402_1005Metric | R7 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C14 |
| 1 | 25MHz | Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm | Y3 |
| 1 | 3.3V Good | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | 32.768kHz | Crystal:Crystal_SMD_2012-2Pin_2.0x1.2mm | Y1 |
| 1 | 33R | Inductor_SMD:L_0603_1608Metric | FB1 |
| 1 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | 4.7uf | Capacitor_SMD:C_0402_1005Metric | C13 |
| 1 | 49.9R | Resistor_SMD:R_0402_1005Metric | R8 |
| 1 | 5V Good | LED_SMD:LED_0603_1608Metric | D2 |
| 1 | 6.8K | Resistor_SMD:R_0402_1005Metric | R11 |
| 1 | Boot Sel | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 1 | Debug | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | J4 |
| 1 | IO Header | Connector_PinSocket_2.54mm:PinSocket_2x14_P2.54mm_Horizontal | J3 |
| 1 | ME6211C33M5 | Package_TO_SOT_SMD:SOT-23-5 | U5 |
| 1 | MH1 | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H1 |
| 1 | MH2 | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H2 |
| 1 | MH3 | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H3 |
| 1 | MH4 | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H4 |
| 1 | Reset | miniMPE:SW_SKRPACE010_AAL | SW1 |
| 1 | STM32F407VET6 | Package_QFP:LQFP-100_14x14mm_P0.5mm | U1 |
| 1 | SY6280AAC | Package_TO_SOT_SMD:SOT-23-5 | U4 |
| 1 | USB In | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | USB Out | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J2 |
| 1 | User LED | LED_SMD:LED_0603_1608Metric | D3 |
The 60 most common of 61 parts.
Questions
How big is the F407-mainboard PCB?
It measures 58.5 × 50.3 mm and has 4 copper layers, 1.58 mm thick.
What parts does the F407-mainboard use?
61 parts, built around the STM32F407VET6, USBLC6-2SC6, ME6211C33M5G-N and SY6280AAC. 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 F407-mainboard KiCad files?
From the adrienles/miniMPE repository on GitHub, at the commit this page was made from: the board is hardware/prototyping/f407-mainboard/f407-mainboard.kicad_pcb and its schematic hardware/prototyping/f407-mainboard/f407-mainboard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the F407-mainboard design in my own project?
Its repository states no licence, so its author keeps all rights: ask adrienles before reusing the design.
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