2 layers85 × 115 mm
OSO BOOK C1
joeycastillo/The-Open-Book
For details on how to build, test and use Open Book, I've made documentation available here.
38 parts8.1kCC-BY-SA-4.0
2 layers205 × 145 mm
Brizachord
jacklpayne/Brizachord19Open-source instrument and chord machine
- Size
- 205 × 145 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 38
- Nets
- 36
- Pads
- 169
- Tracks, vias
- 290, 32
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 25 Jul 2025
- Updated
- 25 Sep 2025
Overview
Brizachord is an open-source printed circuit board by jacklpayne, from the jacklpayne/Brizachord repository on GitHub. It is a 2-layer board of 205 × 145 mm with 38 parts on 36 nets, routed with 290 tracks and 32 vias.
README
README.md
Demo: https://www.youtube.com/watch?v=z-tGAeBtxNY
Overview
The Brizachord is an open-source instrument and chord machine inspired by the Suzuki Omnichord. It features:
- 240 possible chords from 12 root select switches, 4 quality select switches, and 5 extension select switches
- Drum machine triggered by internal sequencer with toggleable chord pattern synchronization ("Groove"), adjustable BPM
- Velocity sensitive, multitouch capacitive strum plate for autoharp-style use
- Self-contained design with its own digital oscillators, amplification, and speaker (i.e, not a MIDI-only type deal).
It was designed by me and will be used in workshops held with the Audio Engineering Society at the University of Florida in Fall 2025.
Technical
The instrument is based on the Daisy Seed audio development board and the associated libdaisy library for programming its STM32H7 MCU. It uses a Bela Trill Bar sensor for the strum plate and an Adafruit PAM8302A Class-D breakout for the amplifier.
The hardware is designed for removability and reuse of the Daisy Seed and the Trill Bar.
Future
Software:
- Improve documentation of all functions
- USB MIDI (important)
- MIDI clock synchronization
- Data-driven CSV reading for sequencer patterns so that users can create their own more easily
Hardware:
- Adjust Trill Bar JST cutout position
- Change corner mounting holes to M3 sized
- Find 12mm switches that are compatible with large black/white circular & square bezels to use for root selects, pattern selects
- Remove unused speaker routing holes and move Trill Bar headers to bottom of board
- Onboard power is possible, but unlikely to be implemented by me on this iteration of the board
Environment setup
The firmware is based on a custom fork of libdaisy that updates the language version to C++17 and merges @giulomoro's Trill support PR (https://github.com/electro-smith/libDaisy/pull/657). When this PR is merged upstream, the project will probably migrate to standard libdaisy.
License
All software/firmware is licensed under GPLv3. All hardware (schematic, design) is licensed under CERN-OHL-S.
Parts
38| Qty | Value | Footprint | References |
|---|---|---|---|
| 24 | SW_SPST | Button_Switch_THT:SW_PUSH-12mm | SWA1, SWAb1, SWB1, SWBb1, SWC1, SWD1, SWDb1, SWE_6th1, SWE_7th1, SWE_9th1, SWE_11th1, SWE_TRI1, SWE1, SWEb1, SWF1, SWG1 +8 |
| 4 | R_Potentiometer_US | Connector_Samtec_HPM_THT:Samtec_HPM-03-01-x-S_Straight_1x03_Pitch5.08mm | POT_BPM1, POT_CHORDVOL1, POT_DRUMVOL1, POT_STRUMVOL1 |
| 2 | 0.1uF | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | DECOUP_AMP1, DECOUP_TRILL1 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | PULLUP_SCL1, PULLUP_SDA1 |
| 1 | 10uF | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | C_BULK1 |
| 1 | Electrosmith_Daisy_Seed_Rev4 | Module:Electrosmith_Daisy_Seed | A1 |
| 1 | LOGO | Brizachord:Prodlogos | G*** |
| 1 | LOGO | Brizachord:Brizachordlogo | G*** |
| 1 | ~ | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | TrillBar1 |
| 1 | ~ | Brizachord:PAM8302_BREAKOUT | PAM1 |
Questions
How big is the Brizachord PCB?
It measures 205 × 145 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Brizachord use?
38 parts. 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 Brizachord KiCad files?
From the jacklpayne/Brizachord repository on GitHub, at the commit this page was made from: the board is kicad/Brizachord/Brizachord.kicad_pcb and its schematic kicad/Brizachord/Brizachord.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Brizachord design in my own project?
Its repository states no licence, so its author keeps all rights: ask jacklpayne before reusing the design.
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