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
- 81
- Nets
- 86
- Pads
- 342
- Tracks, vias
- 913, 122
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 4 Oct 2024
- Updated
- 25 Oct 2026
Overview
16bit+ 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 81 parts on 86 nets, routed with 913 tracks and 122 vias.
It is built around the W25Q128JVSIQ, K2-1808SN-A4SW-01 and ABM8-272-T3, with the AOTA-B201610S3R3-101-T, BLM18AG601SN1D and SX3M11.2896M20F30TNN among its other parts. Its parts include 38 capacitors, 23 resistors, 5 ICs, 3 connectors and 3 switches. It belongs with the audio and music boards and the RP2350 boards of this library.
Main components
6
W25Q128JVSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 120ms@(32KB) 128Mbit 133MHz 1uA 2.7V~3.6V 20 Years 3ms Power-on reset、Hardware write protection、Software write protection、Write enable latch、Absolute write protection SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
K2-1808SN-A4SW-01
SMD,4.2x3.3mm-25℃~+85℃ 100,000 cycles 12V 2.5N 2.5mm 3.25mm 4.2mm 50mA Oval Button SPST Surface Mount,Vertical SMD,4.2x3.3mm Tactile Switches ROHSHRO ElectronicsTactile Switches
ABM8-272-T3
SMD3225-4P-40℃~+85℃ 10pF 12MHz 50Ω SMD crystal oscillator ±30ppm ±30ppm SMD3225-4P Crystals ROHSAbraconCrystals
AOTA-B201610S3R3-101-T
0806115mΩ 2.1A 2.4A 3.3uH Molded inductor 0806 Molding Power Inductors ROHSAbraconPower Inductors
BLM18AG601SN1D
0603-55℃~+125℃ 1 380mΩ 500mA 600Ω@100MHz ±25% 0603 Ferrite Beads ROHSMurataFerrite BeadsSX3M11.2896M20F30TNN
SMD3225-4P-40℃~+85℃ 1.62V~3.63V 10mA 11.2896MHz CMOS ±20ppm ±30ppm SMD3225-4P Crystal Oscillators ROHSShenzhen SCTF ElecCrystal Oscillators
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
81| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 100n | Capacitor_SMD:C_0402_1005Metric | C2, C8, C11, C12, C13, C14, C15, C16, C17, C18, C24 |
| 7 | 0.1uf | Capacitor_SMD:C_0402_1005Metric | C1, C21, C22, C26, C34, C36, C39 |
| 6 | 10uf | Capacitor_SMD:C_0402_1005Metric | C5, C27, C33, C35, C37, C38 |
| 6 | 1k | Resistor_SMD:R_0402_1005Metric | R2, R4, R6, R9, R13, R17 |
| 6 | 33 | Resistor_SMD:R_0402_1005Metric | R5, R19, R20, R21, R22, R23 |
| 5 | 1uf | Capacitor_SMD:C_0402_1005Metric | C23, C25, C29, C30, C31 |
| 4 | 100k | Resistor_SMD:R_0402_1005Metric | R10, R12, R15, R16 |
| 3 | 10k | Resistor_SMD:R_0402_1005Metric | R14, R24, R25 |
| 3 | K2-1808SN-A4SW-01 | BreadModular_MISC:K2-1808SN-A4SW-01 | SW1, SW2, SW3 |
| 2 | 15p | Capacitor_SMD:C_0402_1005Metric | C3, C4 |
| 2 | 1M | BreadModular_Pots:Potentiometer_RV09 | RV1, RV2 |
| 2 | 27 | Resistor_SMD:R_0402_1005Metric | R7, R8 |
| 2 | 4.7u | Capacitor_SMD:C_0402_1005Metric | C9, C10 |
| 2 | 4.7u | RP2350_60QFN_minimal:C_0402_1005Metric_small_pads | C6, C7 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R3, R11 |
| 2 | Conn_01x05_Pin | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | GND1, V_SUPPLY1 |
| 2 | Conn_01x08_Socket | Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical | J1, J2 |
| 1 | 100nf | Capacitor_SMD:C_0402_1005Metric | C28 |
| 1 | 10nf | Capacitor_SMD:C_0805_2012Metric | C20 |
| 1 | 10u | Capacitor_SMD:C_0805_2012Metric | C19 |
| 1 | ABM8-272-T3 | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | AOTA-B201610S3R3-101-T | RP2350_60QFN_minimal:L_pol_2016 | L1 |
| 1 | BLM18AG601SN1D | Capacitor_SMD:C_0603_1608Metric | FB3 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | MCP6002-xSN | Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm | U3 |
| 1 | PSRAM | BreadModular_MISC:SOIC-8 Generic | U5 |
| 1 | RP2350_60QFN | RP2350_60QFN_minimal:RP2350-QFN-60-1EP_7x7_P0.4mm_EP3.4x3.4mm_ThermalVias | U1 |
| 1 | SX3M11.2896M20F30TNN | Oscillator:Oscillator_SMD_SiT_PQFN-4Pin_3.2x2.5mm | Y2 |
| 1 | USB_C_Receptacle_USB2.0_14P | BreadModular_TypeC:HRO-TYPE-C-31-M-12 | J5 |
| 1 | W25Q128JVS | Package_SO:SOIC-8_5.23x5.23mm_P1.27mm | U2 |
| 1 | ~ | Package_DFN_QFN:QFN-28-1EP_4x4mm_P0.45mm_EP2.4x2.4mm_ThermalVias | U4 |
Questions
How big is the 16bit+ PCB?
It measures 30.5 × 68.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 16bit+ use?
81 parts, built around the W25Q128JVSIQ, K2-1808SN-A4SW-01, ABM8-272-T3 and AOTA-B201610S3R3-101-T. 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 16bit+ KiCad files?
From the bread-modular/bread-modular repository on GitHub, at the commit this page was made from: the board is modules/16bit+/16bit+.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the 16bit+ 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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