# Wearable Audio Necklace Recorder ## Description Compact wearable necklace PCB for 5-second audio capture. A button press starts recording with an audible beep, and button release/end of the 5-second window produces a second beep. The design targets low-power LiPo operation, safe charging, small necklace-friendly form factor, accessible programming/debug, and production-ready ERC/DRC-clean PCB layout. ## Project Details - **Owner:** wmakki10 - **Created:** 5/2/2026 - **Last Updated:** 5/2/2026 - **Visibility:** Public ## Key Components ### BZ1 — [CPT-9019S-SMT-TR](https://www.flux.ai/jecstronic/cpt-9019s-smt-tr~c1x.md) - Manufacturer Part Number: CPT-9019S-SMT-TR - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.cuidevices.com/product/resource/cpt-9019s-smt-tr.pdf - Part Type: Buzzer - Manufacturer Name: CUI Devices **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [Type-C 2.0 6Pin](https://www.flux.ai/jharwinbarrozo/type-c-2p0-6pin~wh.md) - Part Type: Connector - Manufacturer Part Number: Type-C-2.0-6Pin - Manufacturer Name: CIKI - LCSC Part Number: C2987385 - Datasheet URL: https://jlcpcb.com/partdetail/CIKI-Type_C_2_06Pin/C2987385 **Pins:** - CC1 [pin A5] - CC2 [pin B5] - GND [pin A12] - GND__1 [pin B12] - SHIELD [pin S1] - SHIELD__1 [pin S2] - SHIELD__2 [pin S3] - SHIELD__3 [pin S4] - V-BUS [pin A9] - V-BUS__1 [pin B9] ### J2 — [S2B-PH-SM4-TB(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-sm4-tblfsn~b96.md) - Manufacturer Part Number: S2B-PH-SM4-TB(LF)(SN) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Manufacturer Name: JST Sales America Inc. **Pins:** - P1 [pin 1] - P2 [pin 2] ### J3 — [FTSH-103-01-F-DV-TR](https://www.flux.ai/adrian95/ftsh-103-01-f-dv-tr~97.md) - Manufacturer Name: Samtec Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: FTSH-103-01-F-DV-TR - Package or Case Code: FTSH-103-XX-YYY-DV-TR - Datasheet URL: http://suddendocs.samtec.com/prints/ftsh-1xx-xx-xxx-dv-xxx-xxx-mkt.pdf - Part Type: Connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] ### MIC1 — [SPH0645LM4H](https://www.flux.ai/kicad-part-library/sph0645lm4h~j0b.md) - Part Type: Sensor Audio - Package or Case Code: Knowles_SPH0645LM4H-6_3.5x2.65mm - Manufacturer Part Number: SPH0645LM4H - Datasheet URL: https://www.knowles.com/docs/default-source/default-document-library/sph0645lm4h-1-datasheet.pdf **Pins:** - BCLK [pin 4] - DATA [pin 6] - GND [pin 3] - SEL [pin 2] - VDD [pin 5] - WS [pin 1] ### Q1 — [BSS138](https://www.flux.ai/adrian95/bss138~qe.md) - Manufacturer Part Number: BSS138 - Part Type: Transistor - Datasheet URL: https://www.onsemi.com/pdf/datasheet/bss138-d.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: onsemi **Pins:** - D [pin 2] - G [pin 1] - S [pin 3] ### SW1 — [PTS810SJK250SMTRLFS](https://www.flux.ai/jharwinbarrozo/pts810sjk250smtrlfs~6tl.md) - LCSC Part Number: C221896 - Part Type: Switch - Manufacturer Part Number: PTS810SJK250SMTRLFS - Datasheet URL: https://datasheet.lcsc.com/lcsc/1810121650_C-K-PTS810SJK250SMTRLFS_C221896.pdf - Manufacturer Name: C&K **Pins:** - P1 [pin 1] - P3 [pin 3] ### U1 — [ESP32-S3-MINI-1-N8](https://www.flux.ai/jecstronic/esp32-s3-mini-1-n8~m3d.md) - Manufacturer Part Number: ESP32-S3-MINI-1-N8 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Module - Datasheet URL: https://www.mouser.com/datasheet/2/891/esp32_s3_mini_1_mini_1u_datasheet_en-2997643.pdf - Manufacturer Name: Espressif Systems **Pins:** - 3V3 [pin 3] - EN [pin 45] - GND [pin 2] - GND [pin 60] - GND [pin 49] - GND [pin 61_6] - GND [pin 59] - GND [pin 46] - GND [pin 47] - GND [pin 43] - GND [pin 61_1] - GND [pin 61] - GND [pin 61_3] - GND [pin 42] - GND [pin 57] - GND [pin 64] - GND [pin 1] - GND [pin 52] - GND [pin 61_8] - GND [pin 61_5] - GND [pin 48] - GND [pin 61_2] - GND [pin 51] - GND [pin 58] - GND [pin 56] - GND [pin 61_4] - GND [pin 63] - GND [pin 65] - GND [pin 53] - GND [pin 61_7] - GND [pin 55] - GND [pin 50] - GND [pin 54] - GND [pin 62] - IO0 [pin 4] - IO1 [pin 5] - IO10 [pin 14] - IO11 [pin 15] - IO12 [pin 16] - IO13 [pin 17] - IO14 [pin 18] - IO15 [pin 19] - IO16 [pin 20] - IO17 [pin 21] - IO18 [pin 22] - IO19 [pin 23] - IO2 [pin 6] - IO20 [pin 24] - IO21 [pin 25] - IO26 [pin 26] - IO3 [pin 7] - IO33 [pin 28] - IO34 [pin 29] - IO35 [pin 31] - IO36 [pin 32] - IO37 [pin 33] - IO38 [pin 34] - IO39 [pin 35] - IO4 [pin 8] - IO40 [pin 36] - IO41 [pin 37] - IO42 [pin 38] - IO45 [pin 41] - IO46 [pin 44] - IO47 [pin 27] - IO48 [pin 30] - IO5 [pin 9] - IO6 [pin 10] - IO7 [pin 11] - IO8 [pin 12] - IO9 [pin 13] - RXD0 [pin 40] - TXD0 [pin 39] ### U2 — [MCP73831T-2ATI/OT](https://www.flux.ai/adrian95/mcp73831t-2atiot~46p.md) - Manufacturer Part Number: MCP73831T-2ATI/OT - Manufacturer Name: Microchip Technology - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/MCP73831-Family-Data-Sheet-DS20001984H.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit **Pins:** - PROG [pin 5] - STAT [pin 1] - VBAT [pin 3] - VDD [pin 4] - VSS [pin 2] ### U3 — [AP2112K-3.3TRG1](https://www.flux.ai/adrian95/ap2112k-33trg1~zlq.md) - Manufacturer Part Number: AP2112K-3.3TRG1 - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.diodes.com/assets/Datasheets/AP2112.pdf - Part Type: Integrated Circuit - Manufacturer Name: Diodes Incorporated - Symbol Style: parametric-v1 **Pins:** - EN [pin 3] - GND [pin 2] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/wmakki10/wearable-audio-necklace-recorder~24](https://www.flux.ai/wmakki10/wearable-audio-necklace-recorder~24).* --- *Generated from [https://www.flux.ai/wmakki10/wearable-audio-necklace-recorder~24](https://www.flux.ai/wmakki10/wearable-audio-necklace-recorder~24)*