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Sunbeam em7000
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444 partsMIT
4 layers85.3 × 75.7 mm
Expresso
amonbenson/expressoAn open source USB Midi Expression pedal converter.
- Size
- 85.3 × 75.7 mm
- Copper layers
- 4
- Thickness
- 1.96 mm
- Parts
- 108
- Nets
- 100
- Pads
- 356
- Tracks, vias
- 526, 187
- Pours
- 11
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 13 Jan 2026
- Updated
- 8 Apr 2026
Overview
Expresso is an open-source printed circuit board by amonbenson, from the amonbenson/expresso repository on GitHub, published under the MIT licence. It is a 4-layer board of 85.3 × 75.7 mm with 108 parts on 100 nets, routed with 526 tracks and 187 vias.
It is built around the STM32G431CBT6, 74AHCT1G17GWH and NE5532, with the XC6206P332MR, H11L1 and SRV05-4 among its other parts. Its parts include 33 resistors, 27 capacitors, 10 ICs, 8 connectors and 2 diodes. It belongs with the STM32 boards of this library.
Main components
7
STM32G431CBT6
LQFP-48(7x7)-40℃~+85℃ 1.71V~3.6V 128KB 12bit 12bit 170MHz 32 Bit 32KB 38 ARM Cortex-M4F Built-in FLASH LQFP-48(7x7) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
74AHCT1G17GWH
TSSOP-5-1.3mm-40℃~+125℃ 1 1 4.5V~5.5V 4.6ns@5V,50pF 40uA 74AHCT 8mA 8mA Schmitt trigger Unidirectional TSSOP-5-1.3mm Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
NE5532
SOP-8-22V~22V 0℃~+70℃ 100dB 10nA 14mA 2 40V/us 42mA 4mV 800nA 8nV/√Hz@30Hz Built-in compensation SOP-8 Operational Amplifier ROHSSungineOperational Amplifier
XC6206P332MR
SOT-23-40℃~+85℃@(Ta) 1 1uA 200mA 3.3V 6V Fixed Over Current Protection Positive SOT-23-3L Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTorex SemiconductorVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
H11L1
DIP-6-55℃~+100℃ 1 1.6mA 1Mbit/s 250mW 3V~15V 5kV DC DIP-6 Logic Output Optoisolators ROHSEverlight ElectronicsLogic Output Optoisolators
SRV05-4
SOT-23-6L-55℃~+150℃ 15V 1pF 4A 5V 5uA 6V 80W ESD Four channels IEC 61000-4-2、IEC 61000-4-5 Unidirectional SOT-23-6L ESD and Surge Protection (TVS/ESD) ROHShongjiachengESD And Surge Protection (TVS/ESD)
1N4148WS
SOD-3231.25V@150mA 100V 150mA 1uA@75V 200mW 2A 4ns Independent SOD-323 Switching Diodes ROHSJiangsu Changjing Electronics Technology (CJ)Switching Diodes
README
README.md
Expresso
An open source USB–Midi–Expression pedal converter.
⚠️ Please note: This project is currently under heavy development and not yet functional. ⚠️
✔️ Supports sustain pedals of any polarity
✔️ Supports any kind of three-pin analog expression pedal
✔️ Pedal state can be output to both Din- or USB-Midi
✔️ Can be used as a classic USB-Din-Midi adapter
... to be continued.
Parts
108| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | 100n | Capacitor_SMD:C_0603_1608Metric | C2, C8, C9, C11, C12, C13, C14, C17, C18, C21, C22, C23, C24, C25, C26, C28 |
| 10 | 10k | Resistor_SMD:R_0603_1608Metric | R2, R4, R17, R20, R21, R24, R25, R28, R29, R32 |
| 8 | 100k | Resistor_SMD:R_0603_1608Metric | R18, R19, R22, R23, R26, R27, R30, R31 |
| 5 | 1k | Resistor_SMD:R_0603_1608Metric | R1, R3, R5, R11, R12 |
| 5 | 1u | Capacitor_SMD:C_0603_1608Metric | C4, C5, C6, C7, C27 |
| 4 | Exp | Connector_Audio:Jack_6.35mm_Neutrik_NMJ6HFD4_Horizontal | J6, J7, J8, J9 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 4 | NE5532 | NE5532DR:NE5532DR | U7, U8, U9, U10 |
| 4 | VR | TestPoint:TestPoint_Pad_D2.0mm | TP10, TP12, TP14, TP16 |
| 4 | VT | TestPoint:TestPoint_Pad_D2.0mm | TP11, TP13, TP15, TP17 |
| 3 | 220 | Resistor_SMD:R_0603_1608Metric | R10, R15, R16 |
| 2 | 12p | Capacitor_SMD:C_0603_1608Metric | C15, C16 |
| 2 | 47 | Resistor_SMD:R_0603_1608Metric | R13, R14 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R8, R9 |
| 2 | XC6206P332MR | Package_TO_SOT_SMD:SOT-23-3 | U1, U2 |
| 1 | +3.3V | TestPoint:TestPoint_Pad_D2.0mm | TP3 |
| 1 | +3.3VA | TestPoint:TestPoint_Pad_D2.0mm | TP4 |
| 1 | +5V | TestPoint:TestPoint_Pad_D2.0mm | TP2 |
| 1 | 10n | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 10u | Capacitor_SMD:C_0603_1608Metric | C10 |
| 1 | 16 MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 1M | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | 1N4148WS | Diode_SMD:D_SOD-323 | D3 |
| 1 | 2.2k | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | 33Ω@100MHz | Inductor_SMD:L_0805_2012Metric | FB1 |
| 1 | 4.7n | Capacitor_SMD:C_0603_1608Metric | C19 |
| 1 | 4.7u | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | 680 | Resistor_SMD:R_0603_1608Metric | R34 |
| 1 | 74AHCT1G17GWH | Package_TO_SOT_SMD:SOT-353_SC-70-5 | U5 |
| 1 | Boot0 | Button_Switch_THT:SW_PUSH_6mm | SW2 |
| 1 | Debug | Connector_PinHeader_2.54mm:PinHeader_1x14_P2.54mm_Vertical | J5 |
| 1 | GND | TestPoint:TestPoint_Pad_D2.0mm | TP5 |
| 1 | GND_GNDA | NetTie:NetTie-2_SMD_Pad0.5mm | NT1 |
| 1 | H11L1 | SOP-6-2.54mm:SOP-6_6.35x8.51mm_P02.54mm | U6 |
| 1 | LED_RBK_GBK | LED_THT_6Pin:LED_D5.0mm_6Pin | D4 |
| 1 | MIDI_RX | TestPoint:TestPoint_Pad_D2.0mm | TP8 |
| 1 | MIDI_TX | TestPoint:TestPoint_Pad_D2.0mm | TP9 |
| 1 | Midi In | DIN5_MIDI_MultiGround:DIN5_MIDI_MultiGround | J2 |
| 1 | Midi Out | DIN5_MIDI_MultiGround:DIN5_MIDI_MultiGround | J3 |
| 1 | MidiOut_Snk | Jumper:SolderJumper-3_P1.3mm_Bridged12_RoundedPad1.0x1.5mm | JP2 |
| 1 | MidiOut_Src | Jumper:SolderJumper-3_P1.3mm_Bridged12_RoundedPad1.0x1.5mm | JP1 |
| 1 | Reset | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | SRV05-4 | Package_TO_SOT_SMD:SOT-23-6 | U4 |
| 1 | STM32G431CBT6 | Package_QFP:LQFP-48_7x7mm_P0.5mm | U3 |
| 1 | USB D+ | TestPoint:TestPoint_Pad_D2.0mm | TP6 |
| 1 | USB D- | TestPoint:TestPoint_Pad_D2.0mm | TP7 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_G-Switch_GT-USB-7010ASV | J1 |
| 1 | VUSB | TestPoint:TestPoint_Pad_D2.0mm | TP1 |
Questions
How big is the Expresso PCB?
It measures 85.3 × 75.7 mm and has 4 copper layers, 1.96 mm thick.
What parts does the Expresso use?
108 parts, built around the STM32G431CBT6, 74AHCT1G17GWH, NE5532 and XC6206P332MR. 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 Expresso KiCad files?
From the amonbenson/expresso repository on GitHub, at the commit this page was made from: the board is hw/Expresso.kicad_pcb and its schematic hw/Debug_Connector.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Expresso 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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