# starter beb1 ## Description 9V Battery 1 Hz LED Blinker Using DIP-8 NE555 (THT) with SPST Switch and Reverse-Polarity Protection ## Project Details - **Owner:** dacre - **Created:** 1/30/2026 - **Last Updated:** 1/30/2026 - **Visibility:** Public - **Board Outline Dimensions:** 90.2mm × 35.4mm - **Board Outline Width (mm):** 90.2mm - **Power Plane Layers:** Layer 2: GND plane; Layer 3: 3.3V plane - **Board Outline Height (mm):** 35.4mm - **Stackup:** Standard 4 Layer - **System Architecture:** graph LR subgraph Power Subsystem USB_C[USB-C Connector] --> Input_Protection[Input Protection] Input_Protection --> Regulator[3.3V Regulator] end subgraph Core Subsystem Regulator --> MCU[Microcontroller] MCU --> Magnetometer[I2C Magnetometer] end subgraph Display Subsystem MCU -->|Control Interface| DisplayDriver[Display Driver ICs] DisplayDriver --> SevenSeg[3×7-Segment Displays] end subgraph UI Subsystem MCU --> Potentiometer[Brightness Pot w/ Switch] MCU --> StatusLED[Status LED] MCU --> ProgHeader[Programming Header] end subgraph Mechanical Board --> MountHoles[4× Mounting Holes] end - **Display Module Width:** 12.8mm ## Key Components ### BT1 — [968](https://www.flux.ai/adrian95/968~4al.md) - Part Type: Battery Connector - Manufacturer Part Number: 968 - License: https://creativecommons.org/licenses/by/4.0/ - Package: THT - Role Details: 9V battery clip connector - Role: Battery input - Pin Type: Power Output - Datasheet URL: https://www.keyelco.com/userAssets/file/M65p31.pdf - Package or Case Code: BAT_968 - Manufacturer Name: Keystone **Pins:** - N [pin N] - P [pin P] ### D1 — [1N5818](https://www.flux.ai/lcsc/1n5818~id7o.md) - Manufacturer Name: LGE(鲁光) - Part Type: Schottky Barrier Diodes (SBD) - JLCPCB Part Class: Extended Part - Role: Protection - Package: DO-41 - Role Details: Series reverse-polarity protection diode on 9V input - Manufacturer Part Number: 1N5818 - Product Info Url: https://lcsc.com/product-detail/Schottky-Barrier-Diodes-SBD_LGE-1N5818_C402217.html - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_LGE-1N5818_C402217.pdf - LCSC Part Number: C402217 - Package or Case Code: DO-41_BD2.4-L4.7-P8.70-D0.9-RD **Pins:** - A [pin 2] - C [pin 1] ### LED1 — [WP710A10ID5V](https://www.flux.ai/adrian95/wp710a10id5v~ugr.md) - Role Details: 5mm red LED indicator - Datasheet URL: https://www.kingbrightusa.com/images/catalog/SPEC/WP710A10ID5V.pdf - Role: Indicator - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: WP710A10ID5V - Part Type: LED - Manufacturer Name: Kingbright - Package: Radial **Pins:** - A [pin 2] - K [pin 1] ### SW1 — [SWITCH-PUSH-6mm-H5mm-4pin](https://www.flux.ai/baronunread/switch-push-6mm-h5mm-4pin~4u.md) - License: https://creativecommons.org/licenses/by/4.0/ - Package: THT - Role: Power switch - Role Details: Series on/off SPST switch for 9V battery input - Part Type: Switch **Pins:** - 1-1 [pin 1-1] - 1-2 [pin 1-2] - 2-1 [pin 2-1] - 2-2 [pin 2-2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/dacre/starter-beb1~915](https://www.flux.ai/dacre/starter-beb1~915).* --- *Generated from [https://www.flux.ai/dacre/starter-beb1~915](https://www.flux.ai/dacre/starter-beb1~915)*