2 layers49.7 × 31.7 mm
2 layers70 × 70 mm
Intercom
romanvrable/openmic2Open, as in open source, audio processing code and PCBs
- Size
- 70 × 70 mm
- Copper layers
- 2
- Thickness
- 1.2 mm
- Parts
- 73
- Nets
- 85
- Pads
- 345
- Tracks, vias
- 342, 91
- Pours
- 117
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 12 Nov 2025
- Updated
- 12 Nov 2025
Overview
Intercom is an open-source printed circuit board by romanvrable, from the romanvrable/openmic repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 70 × 70 mm with 73 parts on 85 nets, routed with 342 tracks and 91 vias.
It is built around the ESP32-S3-MINI-1-N4R2, MAX98357AEWL+T and MD8942, with the ICS-43434, XL-1010RGBC-2812B and CL05A106MQ5NUN among its other parts. Its parts include 31 capacitors, 20 diodes, 7 resistors, 6 connectors and 4 ICs. It belongs with the ESP32 boards of this library.
Main components
12
ESP32-S3-MINI-1-N4R2
SMD-103.5dBm -40℃~+85℃ 2.4GHz 20.5dBm 355mA 3V~3.6V 95mA Bluetooth5.0 ESP32-S3 On-board PCB Antenna UART、SPI、I2C、GPIO、I2S、USB SMD WiFi Modules ROHSEspressif SystemsWiFi Modules
MAX98357AEWL+T
BGA-9(1.3x1.3)-40℃~+85℃ 0.015% 1-Channel、2-Channel 2.5V~5.5V 3.2W×1@4Ω、1.8W×1@8Ω、0.93W×1@8Ω 3.35mA 77dB 92% Automatic mute/no-noise switch、Enable/shutdown function、Filterless architecture、Analog voltage gain、Automatic power-saving mode Class D BGA-9(1.3x1.3) Audio Amplifiers ROHSMaxim Integrated (Analog Devices)Audio Amplifiers
MD8942
SOT-23-6L-40℃~+85℃ 1 1.1MHz 130uA 4V~36V 600mA 800mV~5V Buck Buck Built-in Fixed Yes SOT-23-6L DC-DC Converters ROHSShanghai Mingda MicroelectronicsDC-DC Converters
ICS-43434
LGA-6(3.5x2.7)-26dB -40℃~+85℃ 0.98mm 1.65V~3.63V 2.65mm 3.5mm 550uA 64dB I2S Omnidirectional Omnidirectional pickup LGA-6(3.5x2.7) MEMS Microphones ROHSTDK InvenSenseMEMS Microphones
XL-1010RGBC-2812B
SMD,1x1mm-20℃~+85℃ 0.35mA 0.8mm 120° 1kHz 1mm 1mm 2000V 200mcd、800mcd、300mcd 4.5V~5.5V 800Kbit/s B:465nm~475nm、R:620nm~625nm、G:520nm~530nm G:525nm、R:625nm、B:470nm Top-mount Water Clear SMD,1x1mm RGB LEDs(Built-in IC) ROHSXINGLIGHTRGB LEDs(Built-In IC)
CL05A106MQ5NUN
040210uF 6.3V X5R ±20% 0402 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
GRM188R6YA106MA73
060310uF 35V X5R ±20% 0603 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSMurataMultilayer Ceramic Capacitors MLCC - SMD/SMTCL10A106MQ8NNN
060310uF 6.3V X5R ±20% 0603 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
CA45-B6R3K227T
CASE-B-3528-19(mm)-55℃~+125℃ 1.2Ω@100kHz 220uF 6.3V ±10% CASE-B-3528-19(mm) Tantalum Capacitors ROHSHunan Xiangyee in S&TTantalum Capacitors
TAJD477M006RNJ
CASE-D-7343-31(mm)-55℃~+125℃ 400mΩ@100kHz 470uF 6.3V ±20% CASE-D-7343-31(mm) Tantalum Capacitors ROHSKyocera AVXTantalum Capacitors
S2B-PH-SM4-TB(LF)(SN)
SMD,P=2mm,卧贴-25℃~+85℃ 1 100V 1x2P 2 2A 2P 2mm 5.5mm 7.9mm 8.6mm Auxiliary Solder Pin Beige Copper alloy PA PH Surface Mount, Right Angle Tin UL94V-0 SMD,P=2mm,卧贴 Wire To Board Connector ROHSJSTWire To Board Connector
SPEH130103
SMD,6x6mm-40℃~+90℃ 16V 3N 50mA Black J-Lead Square Button Surface Mount,Vertical SMD,6x6mm Pushbutton Switches ROHSALPSALPINEPushbutton Switches
README
PCB/Intercom/README.mdIntercom
These files are for use in KiCad.
Trademark
This is an open source project, but bear in mind you cannot sell boards bearing the Andrews & Arnold Ltd name, the A&A logo, the registered trademark AJK logo, or the GS1 allocated EANs assigned to Andrews & Arnold Ltd.
Images
Auto generated 2025-08-10T15:43:51
Parts
73| Qty | Value | Footprint | References |
|---|---|---|---|
| 23 | 100nF | RevK:C_0402 | C10, C11, C13, C14, C15, C17, C18, C19, C21, C22, C23, C24, C25, C26, C27, C28 +7 |
| 20 | XL-1010RGBC-WS2812B | RevK:SMD1010 | D1, D2, D3, D4, D5, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20 +4 |
| 2 | 5K1 | RevK:R_0402 | R7, R8 |
| 2 | Square | RevK:PAD-2mm | P1, P2 |
| 2 | ~ | RevK:VCUT70N | V2, V3 |
| 1 | 100nF | RevK:C_0603_ | C3 |
| 1 | 10K | RevK:R_0402 | R6 |
| 1 | 10uF | RevK:C_0402 | C12 |
| 1 | 10uF 35V | RevK:C_0603_ | C1 |
| 1 | 10uF 6.3V | RevK:C_0603_ | C2 |
| 1 | 10uH | RevK:L_4x4_ | L1 |
| 1 | 124k | RevK:R_0402_ | R1 |
| 1 | 1M | RevK:R_0402_ | R3 |
| 1 | 1uF | RevK:C_0402 | C4 |
| 1 | 220uF Tant | RevK:CP_EIA-3528-21_Kemet-B | C20 |
| 1 | 22uF | RevK:C_0603 | C16 |
| 1 | 39k2 | RevK:R_0402_ | R2 |
| 1 | 634K | RevK:R_0402 | R4 |
| 1 | 70x70 | RevK:PCB7070 | PCB1 |
| 1 | C_Polarized | RevK:CP_EIA-7343-31_Kemet-D | C31 |
| 1 | ESP32-S3-MINI-1 | RevK:ESP32-S3-MINI-1 | U2 |
| 1 | ICS43434 | RevK:ICS43434_MEMS_Mic_Open | U4 |
| 1 | JST-PH-SM4-TB | RevK:JST_PH_S2B-PH-SM4-TB_1x02-1MP_P2.00mm_Horizontal | J2 |
| 1 | MAX98357A | RevK:WLP-1.437mmx1.347mm-0.21mm-ball | U6 |
| 1 | MD8942 | RevK:SOT-23-6-MD8942 | U1 |
| 1 | Reset | RevK:AA-Pad | J1 |
| 1 | SW_SPST | Button_Switch_SMD:SW_Push_1TS009xxxx-xxxx-xxxx_6x6x5mm | SW1 |
| 1 | TC2030-USB-NL-DS | RevK:Tag-Connect_TC2030-IDC-NL_2x03_P1.27mm_Vertical | J4 |
| 1 | USB-C-Socket-H | RevK:USB-C-Socket-H | J5 |
Questions
How big is the Intercom PCB?
It measures 70 × 70 mm and has 2 copper layers, 1.2 mm thick.
What parts does the Intercom use?
73 parts, built around the ESP32-S3-MINI-1-N4R2, MAX98357AEWL+T, MD8942 and ICS-43434. 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 Intercom KiCad files?
From the romanvrable/openmic repository on GitHub, at the commit this page was made from: the board is PCB/Intercom/Intercom.kicad_pcb and its schematic PCB/CommBadge/CommBadge.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Intercom 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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