2 layers30.5 × 68.6 mm Hihat, the printed circuit board in 3D

Hihat

Modular Synths for Everyone

Size: 30.5 × 68.6 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 52
Nets: 53
Pads: 183
Tracks, vias: 407, 47
Routed: Yes
KiCad: KiCad 8.0 (file 20240108)
Created: 4 Oct 2024
Updated: 25 Oct 2026

Overview

Hihat 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 52 parts on 53 nets, routed with 407 tracks and 47 vias.

It is built around the ATTINY1616-MN, SS8050 and SS14, with the SS8550 among its other parts. Its parts include 27 resistors, 9 capacitors, 5 ICs and 4 diodes. It belongs with the audio and music boards and the AVR (ATmega, ATtiny) boards of this library.

Main components

README

README.md

Bread 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 --help

Python + 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

Project image and full feature overview

Bread Modular

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

Qty	Value	Footprint	References
6	100k	Resistor_SMD:R_0402_1005Metric	R2, R13, R17, R18, R21, R24
5	1k	Resistor_SMD:R_0402_1005Metric	R3, R7, R8, R11, R25
5	330	Resistor_SMD:R_0402_1005Metric	R1, R5, R6, R12, R15
4	10k	Resistor_SMD:R_0402_1005Metric	R10, R16, R19, R27
3	MCP6002-xSN	Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm	U2, U3, U4
2	0.1uf	Capacitor_SMD:C_0402_1005Metric	C4, C5
2	1M	Resistor_SMD:R_0402_1005Metric	R22, R23
2	1nf	Capacitor_SMD:C_0402_1005Metric	C2, C3
2	200k	Resistor_SMD:R_0402_1005Metric	R4, R20
2	22k	Resistor_SMD:R_0402_1005Metric	R9, R14
2	50k	BreadModular_Pots:Potentiometer_RV09	RV1, RV2
2	Conn_01x05_Pin	BreadModular_MISC:Power_Connector	GND1, V_SUPPLY1
2	Conn_01x05_Socket	Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical	INPUT1, OUTPUT1
2	SS8050	Package_TO_SOT_SMD:SOT-23	D1, D3
1	100pf	Capacitor_SMD:C_0402_1005Metric	C1
1	100uf	Capacitor_SMD:C_1206_3216Metric	C9
1	10nf	Capacitor_SMD:C_0402_1005Metric	C7
1	4.7k	Resistor_SMD:R_0402_1005Metric	R26
1	4.7uf	Capacitor_SMD:C_0603_1608Metric	C8
1	47uf	Capacitor_SMD:C_0805_2012Metric	C6
1	ATtiny1616-M	Package_DFN_QFN:VQFN-20-1EP_3x3mm_P0.4mm_EP1.7x1.7mm	U5
1	Conn_01x05_Pin	BreadModular_MISC:Conn_Holes_2	V_SUPPLY2
1	SS14	Diode_SMD:D_SMA	D2
1	SS8550	Package_TO_SOT_SMD:SOT-23	D4
1	VTL5C	BreadModular_MISC:VTL5C	U1

Questions

How big is the Hihat PCB?

It measures 30.5 × 68.6 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Hihat use?

52 parts, built around the ATTINY1616-MN, SS8050, SS14 and SS8550. 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 Hihat KiCad files?

From the bread-modular/bread-modular repository on GitHub, at the commit this page was made from: the board is modules/hihat/hihat.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Hihat 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).

Category and platform

Audio and music AVR (ATmega, ATtiny)

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/bread-modular-bread-modular-hihat" title="Hihat in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/bread-modular-bread-modular-hihat.jpg" alt="Hihat" width="1200" height="900">

A picture that opens the board, for a README

[![Hihat](https://pcbkit.io/embed/boards/bread-modular-bread-modular-hihat.jpg?size=s)](https://pcbkit.io/boards/bread-modular-bread-modular-hihat)

Source

Repository: bread-modular/bread-modular
Board file: modules/hihat/hihat.kicad_pcb
Commit: b47ff0a
Homepage: breadmodular.com
Licence: MIT

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