4 layers55 × 100.5 mm
OSS Radio Hardware Design
Arkos-Engineering/HT-15_hardware
We can split this out into separate repos later, right now its very convenient to have everything here.
256 parts72
2 layers59.5 × 105 mm
FeatheAudio
TMRh20/FeatherAudioCustom Audio Circuit Board for Feather 52840
- Size
- 59.5 × 105 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 15
- Nets
- 34
- Pads
- 84
- Tracks, vias
- 184, 36
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 10 Feb 2026
- Updated
- 28 Feb 2026
Overview
FeatheAudio is an open-source printed circuit board by TMRh20, from the TMRh20/FeatherAudio repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 59.5 × 105 mm with 15 parts on 34 nets, routed with 184 tracks and 36 vias.
It is built around the SPH0645LM4H-B. Its parts include 5 connectors, 3 switches, 2 capacitors and 2 resistors. It belongs with the audio and music and microcontroller boards boards of this library.
Main components
1README
README.mdFeatherAudio
Custom Circuit Board for Feather 52840
Designed by TMRh20, Sponsored by PCBWay
Requirements:
2 x Custom Circuit Board
2 x Feather 52840 based board (Feather 52840 Sense or Express)
2 x Max98357A I2S Amplifier breakout
2 x 4 to 8 Ohm Speaker (Gikfun 1.5" 4-Ohm, 3w, EK1794)
2 x 2032 3.3v Coin Battery
6 x AAA Battery
(Optional) 2 x Micro-SD Card
This custom circuit board was designed for basic prototyping via the AutoAnalogAudio library, however, it can be used
to create a custom walkie-talkie or intercom with range similar to Bluetooth.
Parts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | SW_Push | Button_Switch_THT:SW_Tactile_SPST_Angled_PTS645Vx83-2LFS | SW1, SW2, SW3 |
| 1 | 10k | Resistor_SMD:R_0402_1005Metric | R2 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 220pF | Capacitor_Tantalum_SMD:CP_EIA-1608-08_AVX-J | C2 |
| 1 | 68 | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | Amp Socket 1x7 | Connector_PinSocket_2.54mm:PinSocket_1x07_P2.54mm_Vertical | J1 |
| 1 | Battery | Battery:BatteryHolder_Keystone_1058_1x2032 | BT1 |
| 1 | Battery | Battery:BatteryHolder_Keystone_2479_3xAAA | BT2 |
| 1 | Conn_01x02_Socket | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J3 |
| 1 | Micro_SD_Card | Connector_Card:microSD_HC_Hirose_DM3AT-SF-PEJM5 | J6 |
| 1 | SPH0645LM4H | Sensor_Audio:Knowles_SPH0645LM4H-6_3.5x2.65mm | MK1 |
| 1 | XIAO LEFT | Connector_PinSocket_2.54mm:PinSocket_1x16_P2.54mm_Vertical_SMD_Pin1Left | J4 |
| 1 | XIAO RIGHT | Connector_PinSocket_2.54mm:PinSocket_1x12_P2.54mm_Vertical_SMD_Pin1Left | J5 |
Questions
How big is the FeatheAudio PCB?
It measures 59.5 × 105 mm and has 2 copper layers, 1.6 mm thick.
What parts does the FeatheAudio use?
15 parts, built around the SPH0645LM4H-B. 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 FeatheAudio KiCad files?
From the TMRh20/FeatherAudio repository on GitHub, at the commit this page was made from: the board is KiCadFiles/FeatheAudio.kicad_pcb and its schematic KiCadFiles/FeatheAudio.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the FeatheAudio design in my own project?
Its repository publishes it under the GPL-3.0 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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