2 layers56 × 120 mm
2 layers65.2 × 100 mm
Gk midi module
cycfi/nexus20The Nexus breakout box
- Size
- 65.2 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 115
- Nets
- 79
- Pads
- 347
- Tracks, vias
- 934, 76
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 7 Oct 2016
- Updated
- 29 Jun 2026
Overview
Gk midi module is an open-source printed circuit board by cycfi, from the cycfi/nexus repository on GitHub. It is a 2-layer board of 65.2 × 100 mm with 115 parts on 79 nets, routed with 934 tracks and 76 vias.
It is built around the LMV324, MIC5205-3.3YM5 and 1SS302A,LF. Its parts include 41 resistors, 37 capacitors, 6 ICs, 2 diodes and 1 crystal. It belongs with the audio and music boards and the MSP430 boards of this library.
Main components
3
LMV324
SOP-14-40℃~+85℃ 1MHz 2.8dB 250nA 3V~5.5V 4 400V/ms 40mA 40uV/√Hz@1kHz 430uA 5nA 7mV Built-in compensation、ESD protection SOP-14 Operational Amplifier ROHSIDCHIPOperational Amplifier
MIC5205-3.3YM5
SOT-23-5-40℃~+85℃@(Ta) 1 150mA 200mV@(50mA) 20V 2uA 3.3V 70dB@(1kHz) Fixed Over Current Protection、Over Temperature Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
1SS302A,LF
SC-701 Pair Series Connection 1.6ns 100mA 100mW 2A 500nA@80V 80V 900mV@100mA SOT-323 Switching Diodes ROHSToshibaSwitching Diodes
README
README.mdNexus
The Nexus is a small, flexible, and hacker friendly breakout box that connects your multichannel guitar to the outside world using a specialized (LEMO compatible) multi-pin connector for up to 15 channels of audio and 7 channels of analog control voltages for by-wire (remote) control of volume, tone, patch or effects. Audio may come from standard mono-pickups or from the Nu multichannel pickup. Analog control voltages are converted to MIDI control messages.
Refer to this repository to get the Eagle libraries used in our schematic and pcb files: https://github.com/cycfi/eagle_common
Hardware design files licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Software source code distributed under the MIT License.
Parts
115| Qty | Value | Footprint | References |
|---|---|---|---|
| 19 | 0.1uF | gk_midi_module:C0603 | C3, C4, C5, C10, C12, C17, C18, C19, C20, C21, C23, C24, C25, C26, C28, C29 +3 |
| 18 | 5.1k | gk_midi_module:R0402 | R7, R10, R11, R12, R13, R14, R15, R16, R17, R18, R24, R25, R26, R38, R39, R40 +2 |
| 10 | TPB1,27 | gk_midi_module:B1,27 | TP_1, TP_2, TP_3, TP_4, TP_5, TP_6, TP_7, TP_SER0, TP2, TP3 |
| 6 | 100K | gk_midi_module:R0402 | R1, R2, R3, R4, R5, R6 |
| 6 | 10k | gk_midi_module:R0402 | R27, R28, R29, R35, R36, R37 |
| 3 | gk_midi_module:MA08-1 | H1, H2, H3 | |
| 3 | 10uF | gk_midi_module:C0805 | C9, C11, C22 |
| 3 | 1K | gk_midi_module:R0402 | R32, R33, R34 |
| 2 | @HOLE0, @HOLE1 | ||
| 2 | gk_midi_module:1X03M | JP2, JP3 | |
| 2 | 100R | gk_midi_module:R0603 | R22, R23 |
| 2 | 100uF | gk_midi_module:153CLV-0505 | C1, C2 |
| 2 | 12pF | gk_midi_module:0603 | C36, C37 |
| 2 | 1SS302 | gk_midi_module:SC70-3 | D1, D2 |
| 2 | 1uF | gk_midi_module:C0402 | C27, C30 |
| 2 | 220 | gk_midi_module:R0603 | R30, R31 |
| 2 | 2N2222 | gk_midi_module:SOT23-3 | T1, T2 |
| 2 | 4.7uF | gk_midi_module:C0603 | C15, C16 |
| 2 | BLM18KG700TN1D | gk_midi_module:BEADC1608X75N | FB1, FB2 |
| 2 | DNP | gk_midi_module:MA08-1 | H6, H7 |
| 2 | DNP | gk_midi_module:MA04-2 | H4, H5 |
| 1 | gk_midi_module:MA04-1 | H8 | |
| 1 | gk_midi_module:MSOP8 | U1 | |
| 1 | 0.01uF | gk_midi_module:C0402 | C14 |
| 1 | 0.1uf | gk_midi_module:C0603 | C34 |
| 1 | 0.47uF | gk_midi_module:C0603 | C13 |
| 1 | 10K | gk_midi_module:R0402 | R19 |
| 1 | 10uf | gk_midi_module:C0805 | C32 |
| 1 | 13P_MIDI_2 | gk_midi_module:13P-MIDI-2 | U$1 |
| 1 | 18K | gk_midi_module:R0402 | R20 |
| 1 | 1nF | gk_midi_module:C0402 | C35 |
| 1 | 2.2uf | gk_midi_module:C0805 | C33 |
| 1 | 33uf | gk_midi_module:C0805 | C31 |
| 1 | 470K | gk_midi_module:R0402 | R21 |
| 1 | 47K | gk_midi_module:R0402 | R41 |
| 1 | L78LXX | gk_midi_module:SOT89 | U4 |
| 1 | LMV324 | gk_midi_module:SSOP-14 | U2 |
| 1 | MIC5205-3.3 | gk_midi_module:SOT23-5 | U5 |
| 1 | MIDI_JACK | gk_midi_module:MIDI_JACK | MIDI1 |
| 1 | MSP430G2553RHB32 | gk_midi_module:QFN32 | U6 |
| 1 | QUARZ5 | gk_midi_module:QUARZ5 | X1 |
| 1 | TLV2170DGKT | gk_midi_module:MSOP8 | U3 |
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Questions
How big is the Gk midi module PCB?
It measures 65.2 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Gk midi module use?
115 parts, built around the LMV324, MIC5205-3.3YM5 and 1SS302A,LF. 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 Gk midi module KiCad files?
From the cycfi/nexus repository on GitHub, at the commit this page was made from: the board is breakout_box/gk_midi_module/kicad/gk_midi_module.kicad_pcb and its schematic breakout_box/io_module/io_module.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Gk midi module design in my own project?
Its repository states no licence, so its author keeps all rights: ask cycfi before reusing the design.