Main board
About the Main board
Main board is an open source RP2040/RP2350 PCB design by PhysicsDptAngers, published on GitHub under the MIT license. It is a 2-layer board measuring 77.2 × 76.1 mm, with 14 components from 11 distinct parts.
Its main chip is the Pico, from the RP2040/RP2350 family. By type, the board carries 10 connectors, 1 IC, 1 transistor, 1 switch and 1 LED.
It belongs with the audio designs in this gallery.
From the project
Open source, analog and polyphonic synthesizer
The controller board serves as the equivalent of a synthesizer’s front panel.
For now, we provide a very basic frontend for a subtractive synthesizer. It is more of a demonstration of what can be done than a de facto standard. You can, in principle, design any frontend you like.
The controller board must send its data in MIDI format over the I²C bus to the conductor board.
Main components on the Main board
Main board bill of materials (BOM)
14 components, 11 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Pico | RPi_Pico_SMD_TH | U1 |
| 1 | BS170F | SOT-23 | Q1 |
| 1 | USB_B | USB_B_OST_USB-B1HSxx_Horizontal | J1 |
| 1 | Conn_VCO_A | PinHeader_2x05_P2.54mm_Vertical | J1_VCO_A1 |
| 1 | Conn_VCO_B | PinHeader_2x05_P2.54mm_Vertical | J2_VCO_B1 |
| 1 | Conn_01x04_Socket | NS-Tech_Grove_1x04_P2mm_Vertical | J3 |
| 1 | Conn_Filter | PinHeader_2x05_P2.54mm_Vertical | J3_Filter1 |
| 1 | Conn_VCA | PinHeader_2x05_P2.54mm_Vertical | J4_VCA1 |
| 4 | Conn_Env | PinHeader_2x05_P2.54mm_Vertical | J5_Env1, J6_LFO1, J7_DSO1, J8_POLY1 |
| 1 | RotaryEncoder_Switch | RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW2 |
| 1 | SSD1306 | 128x64OLED | Brd1 |
Main board design files
The KiCad project lives in the PhysicsDptAngers/polyUAnalog repository on GitHub; these links point at the commit this page was built from.
Main board: common questions
What microcontroller does the Main board use?
The Main board is built around the Pico, from the RP2040/RP2350 family.
How big is the Main board?
The Main board measures 77.2 × 76.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Main board?
14 components, from 11 distinct parts. The full bill of materials is listed on this page.
Where can I download the Main board design files?
From the PhysicsDptAngers/polyUAnalog repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Main board design in my own project?
Yes, under the terms of its MIT license, which PhysicsDptAngers chose for the repository.
Can I test firmware for the Main board without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.
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