4 layers
2 layers35 × 29.7 mm
Microphone Fin
hlord2000/Microphone-Fin- Size
- 35 × 29.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 6
- Nets
- 22
- Pads
- 39
- Tracks, vias
- 42, 24
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 3 Dec 2025
- Updated
- 23 Jan 2026
Overview
Microphone Fin is an open-source printed circuit board by hlord2000, from the hlord2000/Microphone-Fin repository on GitHub. It is a 2-layer board of 35 × 29.7 mm with 6 parts on 22 nets, routed with 42 tracks and 24 vias.
It is built around the T5838. Its parts include 3 connectors, 1 capacitor and 1 IC. It belongs with the audio and music boards of this library.
Main components
1README
README.mdnRF54 Low Power Microphone Fin
A microphone expansion board for nRF54 devkits, featuring the T5838 low power PDM mic
| nRF54L15 Pin | T5838 Pin |
|---|---|
| IO8 | DATA |
| IO10 | WAKE |
| IO11 | THSEL |
| IO12 | CLK |
Parts
6| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J3 |
| 1 | Conn_02x02_Odd_Even | nRF-DK-Connector_PinSocket_2.54mm:PinSocket_2x02_P2.54mm_Horizontal | J1 |
| 1 | Conn_02x10_Odd_Even | nRF-DK-Connector_PinSocket_2.54mm:PinSocket_2x10_P2.54mm_Horizontal | J2 |
| 1 | SolderJumper_2_Bridged | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP1 |
| 1 | T5838 | Microphone-Fin:MIC_T5838 | U1 |
Questions
How big is the Microphone Fin PCB?
It measures 35 × 29.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Microphone Fin use?
6 parts, built around the T5838. 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 Microphone Fin KiCad files?
From the hlord2000/Microphone-Fin repository on GitHub, at the commit this page was made from: the board is Microphone-Fin.kicad_pcb and its schematic Microphone-Fin.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Microphone Fin design in my own project?
Its repository states no licence, so its author keeps all rights: ask hlord2000 before reusing the design.
Similar boards
- 4 layers32.9 × 20.8 mm
Cue devboard
tanishasrinivasan/cue-sephacks
A 33 × 21 mm, 4-layer board (signal / GND / 1V8 / signal) with the cuff circuits plus bench conveniences: USB-C charging, JST-PH battery and JST-SH motor connectors, SWD debug and back-side test pads (TP1–TP13) for…
52 parts - 2 layers18.5 × 11.1 mm
Switch
byrantech/laptop
anyon_e, a highly integrated, high end, open source laptop. Attempt the impossible.
6 parts4.3kMIT - 2 layers14.6 × 33 mm
- 2 layers9 × 9 mm
Dpoint
Jcparkyn/dpoint
Open-source digital stylus using camera tracking and inertial measurements
6 parts1.1kMIT - 2 layers51.5 × 16.6 mm
MicroswitchXY Endstop
VoronDesign/Voron-Hardware
Cool Hardware designed by the Voron Design group
6 parts1.1kGPL-3.0 - 2 layers21.9 × 76.7 mm
Amiga External
hoglet67/RGBtoHDMI
Bare-metal Raspberry Pi project that provides pixel-perfect sampling of Retro Computer RGB/YUV video and conversion to HDMI
6 parts1kGPL-3.0 - 2 layers88.9 × 50.8 mm
Businesscard
hackclub/OnBoard
💡 Join 1,000 teenagers and make your first PCB with a $100 grant!
6 parts915