2 layers223.5 × 160 mm
2 layers30.5 × 68.6 mm
Modular Synths for Everyone
- Size
- 30.5 × 68.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 62
- Nets
- 69
- Pads
- 183
- Tracks, vias
- 515, 66
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 4 Oct 2024
- Updated
- 25 Oct 2026
Overview
Midi is an open-source printed circuit board by bread-modular, from the bread-modular/bread-modular repository on GitHub, published under the MIT licence. It is a 2-layer board of 30.5 × 68.6 mm with 62 parts on 69 nets, routed with 515 tracks and 66 vias.
It is built around the ATTINY1616-MN, SS8050 and SS14. Its parts include 35 resistors, 17 diodes, 2 capacitors, 2 ICs and 1 connector. It belongs with the audio and music boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
3
ATTINY1616-MN
QFN-20-EP(3x3)-40℃~+105℃ 1.8V~5.5V 10bit 16KB 18 20MHz 256Byte 2KB 8 Bit 8bit AVR Built-in FLASH QFN-20-EP(3x3) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
SS8050
SOT-323-55℃~+150℃ 1 NPN 1.5A 100MHz 100nA 200 25V 300mW 500mV 5V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
SS14
SMA(DO-214AC)-55℃~+150℃ 1A 25A 300uA@40V 40V 550mV@1A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
README
README.mdBread Modular
An open-source hardware modular synthesizer format designed to be minimalistic and cost-effective: USB-powered, breadboard-friendly, with analog/digital modules and MIDI alongside CV & Gate.
Find your starting point
- Build or explore: modules, specification, common parts.
- Set up KiCad libraries: workspace/library setup. Projects
use the shared
opt/fp-lib-table; initialization copies local submodules rather than cloning them. - Check/export/source parts: KiCad toolkit.
Canonical tools, JLCPCB utilities and skills live under
opt/kicad-tools/.
KiCad quick start
python3 -B opt/kicad-tools/kicad_tools.py --help
python3 -B opt/kicad-tools/kicad_tools.py doctor
python3 -B opt/kicad-tools/kicad_tools.py export --helpPython + installed KiCad CLI; no extra packages for core tools. Private checks,
Gerber/BOM/CPL export, native netlist helpers and read-only sourcing have
distinct requirements and safety boundaries.
Exports are not electrical/release/order approval; keep frozen module scripts
and production designs untouched. Historical opt/kicad-jlcpcb and
.agents/skills/{kicad-workflow,jlcpcb-assembly} resolve through
relative compatibility symlinks.
Agents: start with the KiCad workflow skill or assembly skill, then actual CLI help.
Project references
Module catalog · Modular MIDI · PCB assembly
- Standalone exporter / native part-number setup
- Sourcing, audits and passive planning
- 32bit-5v sourcing / release HOLD
- 16bit-5v sourcing HOLD evidence
Project image and full feature overview
- Modular design: Just like Eurorack.
- USB-powered: It can be portable.
- Minimal design: Cost-effective.
- Modular MIDI support: Communicate between modules; CV & Gate still supported.
- Analog and digital signal paths: It’s your choice.
- Diverse built-in modules: A wide range of pre-designed modules.
- Configurable digital modules: Voice and CV using AtTiny 1616 or ESP32.
- Fully open source: Schematics, PCB designs and code.
- Ease of customization: Create modules tailored to your needs.
- No case required: Use directly on a breadboard or a simple base module.
Parts
62| Qty | Value | Footprint | References |
|---|---|---|---|
| 24 | 1k | Resistor_SMD:R_0402_1005Metric | R2, R10, R11, R12, R13, R14, R15, R17, R19, R21, R22, R24, R25, R27, R28, R30 +8 |
| 9 | 10k | Resistor_SMD:R_0402_1005Metric | R3, R5, R16, R20, R23, R26, R29, R32, R34 |
| 8 | LED | LED_SMD:LED_0603_1608Metric | D1, D4, D6, D8, D11, D13, D15, D100 |
| 8 | SS8050 | Package_TO_SOT_SMD:SOT-23 | D2, D3, D5, D7, D10, D12, D14, D16 |
| 3 | Conn_01x05_Pin | BreadModular_MISC:Power_Connector | CONFIG1, GND1, V_SUPPLY1 |
| 1 | 0.1uf | Capacitor_SMD:C_0402_1005Metric | C2 |
| 1 | 100uf | Capacitor_SMD:C_1206_3216Metric | C1 |
| 1 | 220 | Resistor_SMD:R_0402_1005Metric | R18 |
| 1 | 4.7k | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | 6N137 | BreadModular_MISC:SOIC-8 2.54 | U2 |
| 1 | ATtiny1616-M | Package_DFN_QFN:VQFN-20-1EP_3x3mm_P0.4mm_EP1.7x1.7mm | U1 |
| 1 | GATE_OUT | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | OUTPUT1 |
| 1 | MIDI_IN | BreadModular_AudioJacks:Jack_3.5mm_QingPu_WQP-PJ366ST_Vertical | J1 |
| 1 | MIDI_OUT | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | OUTPUT2 |
| 1 | SS14 | Diode_SMD:D_SMA | D9 |
Questions
How big is the Midi PCB?
It measures 30.5 × 68.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Midi use?
62 parts, built around the ATTINY1616-MN, SS8050 and SS14. 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 Midi KiCad files?
From the bread-modular/bread-modular repository on GitHub, at the commit this page was made from: the board is modules/midi/midi.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Midi 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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