2 layers8.5 × 10.8 mm
Daughterboardv4
kzsol/AIM2_daughterboard
This Repository shares the design of an add-on board for AIM-2
8 parts2
4 layers
Beamformer
rheejason/circular-mic-arrayUIUC ECE 395: an 8-mic circular beamforming microphone array (steerable conference-table mic and acoustic imager).
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 113
- Nets
- 182
- Pads
- 499
- Tracks, vias
- 946, 227
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 11 Oct 2026
- Updated
- 3 Nov 2026
Overview
Beamformer is an open-source printed circuit board by rheejason, from the rheejason/circular-mic-array repository on GitHub. It is a 4-layer board with 113 parts on 182 nets, routed with 946 tracks and 227 vias.
It is built around the ADAU7118ACPZRL, MCP1826S-3302E/DB and USBLC6-2SC6, with the MMICT5838-00-012 and USB4145-03-0170-C among its other parts. Its parts include 40 capacitors, 22 resistors, 16 diodes, 7 ICs and 3 connectors. It belongs with the STM32 boards of this library.
Main components
5
ADAU7118ACPZRL
LFCSP-16(3x3)-40℃~+85℃ 1.1V~1.98V、1.7V~3.63V 126dB 24 256kHz~24.576MHz 4kHz 4uA 8 I2S Not supported LFCSP-16(3x3) Audio Interface ICs ROHSAnalog DevicesAnalog To Digital Converters (ADC)
MCP1826S-3302E/DB
SOT-223-3-40℃~+125℃ 1 1A 220uA 3.3V 400mV@(1A) 60dB@(100Hz) 6V Fixed Positive Under Voltage Lockout、Over Current Protection、Over Temperature Protection、Short Circuit Protection SOT-223-3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMicrochip TechnologyVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
MMICT5838-00-012
SMD-5P,3.5x2.7mm-40℃~+85℃ -41dB 0.98mm 1.62V~1.98V 2.65mm 3.5mm 330uA 68dB Omnidirectional Omnidirectional pickup SMD-5P,3.5x2.7mm MEMS Microphones ROHSTDK InvenSenseMEMS MicrophonesUSB4145-03-0170-C
SMD-25℃~+85℃ 1 24P 48V 5A Black Female Type-C USB 2.0 SMD USB Connectors ROHSGlobal Connector Technology (GCT)USB Connectors
README
README.mdCircular Beamforming Microphone Array
UIUC ECE 395: an 8-mic circular beamforming microphone array (steerable conference-table mic and acoustic imager).
| Folder | What | Tooling |
|---|---|---|
firmware/nucleo-proto/ | Bench prototype: NUCLEO-H753ZI + 4 Adafruit PDM mics on a 3D-printed 45 mm ring | STM32CubeIDE |
firmware/final/ | Firmware for the custom 8-mic STM32H743 board | STM32CubeIDE |
firmware/common/ | Hardware-independent C shared by both: DOA (GCC-PHAT), beamformer, ring buffer | CMSIS-DSP |
hardware/kicad/ | 8-mic board: 8 × T5838 PDM mics → ADAU7118 → STM32H743 SAI | KiCad |
hardware/mechanical/ | Bench rig mount and enclosure (STEP / 3MF exports) | Fusion 360 |
hardware/bom/ | Bills of materials |
Parts
113| Qty | Value | Footprint | References |
|---|---|---|---|
| 28 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C1, C2, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C24, C25, C26, C27 +12 |
| 16 | 220R | Resistor_SMD:R_0805_2012Metric | R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16 |
| 16 | LED_Blue_AA4040QBS-G | Beamformer:LED_Kingbright_AA4040QBS-G | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16 |
| 8 | MMICT5838-00-012 | T5838:MIC_MMICT5838-00-012 | MK1, MK2, MK3, MK4, MK5, MK6, MK7, MK8 |
| 6 | 1uF | Capacitor_SMD:C_0805_2012Metric | C4, C5, C6, C7, C36, C38 |
| 4 | GND | TestPoint:TestPoint_Pad_D1.5mm | TP1, TP5, TP9, TP13 |
| 3 | MountingHole_3.2mm_M3 | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3 |
| 2 | 10K | Resistor_SMD:R_0805_2012Metric | R18, R23 |
| 2 | 10pF | Capacitor_SMD:C_0805_2012Metric | C20, C21 |
| 2 | 2.2uF | Capacitor_SMD:C_0805_2012Metric | C22, C23 |
| 2 | 4.7uF | Capacitor_SMD:C_0805_2012Metric | C3, C40 |
| 2 | 4K7 | Resistor_SMD:R_0805_2012Metric | R17, R20 |
| 2 | 5K1 | Resistor_SMD:R_0805_2012Metric | R21, R22 |
| 1 | +1V8 | TestPoint:TestPoint_Pad_D1.5mm | TP10 |
| 1 | +3V3 | TestPoint:TestPoint_Pad_D1.5mm | TP11 |
| 1 | +5V | TestPoint:TestPoint_Pad_D1.5mm | TP12 |
| 1 | 16 MHz | Beamformer:ECS-160-8-30Q-VY-TR | Y1 |
| 1 | ADAU7118ACPZRL | Beamformer:CP-16-22_ADI | U4 |
| 1 | Audio/UART Header | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J3 |
| 1 | MCP1826S-3302E/DB | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U5 |
| 1 | PDM_CLK0 | TestPoint:TestPoint_Pad_D1.5mm | TP4 |
| 1 | PDM_CLK1 | TestPoint:TestPoint_Pad_D1.5mm | TP8 |
| 1 | PDM_DAT0 | TestPoint:TestPoint_Pad_D1.5mm | TP2 |
| 1 | PDM_DAT1 | TestPoint:TestPoint_Pad_D1.5mm | TP3 |
| 1 | PDM_DAT2 | TestPoint:TestPoint_Pad_D1.5mm | TP6 |
| 1 | PDM_DAT3 | TestPoint:TestPoint_Pad_D1.5mm | TP7 |
| 1 | SN74AXC4T774PWR | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U7 |
| 1 | STM32H753ZITx | Package_QFP:LQFP-144_20x20mm_P0.5mm | U1 |
| 1 | SWD_HEADER | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J1 |
| 1 | TLC59116FIPWR | Package_SO:TSSOP-28_4.4x9.7mm_P0.65mm | U3 |
| 1 | TLV75518PDBVR | Package_TO_SOT_SMD:SOT-23-5 | U6 |
| 1 | USB4145-03-0170-C | Beamformer:CONN_USB4145-03-0230-C_GCT | J2 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U2 |
Questions
What parts does the Beamformer use?
113 parts, built around the ADAU7118ACPZRL, MCP1826S-3302E/DB, USBLC6-2SC6 and MMICT5838-00-012. 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 Beamformer KiCad files?
From the rheejason/circular-mic-array repository on GitHub, at the commit this page was made from: the board is hardware/kicad/beamformer/beamformer.kicad_pcb and its schematic hardware/kicad/beamformer/beamformer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Beamformer design in my own project?
Its repository states no licence, so its author keeps all rights: ask rheejason before reusing the design.
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