# 1 Hz 555 LED Blinker ## Description Through-hole 1 Hz red LED blinker powered by a 9V battery through an on/off switch, using an NE555 astable oscillator on a 50 mm x 50 mm 2-layer PCB. ## Project Details - **Owner:** bryan - **Created:** 4/29/2026 - **Last Updated:** 4/29/2026 - **Visibility:** Public ## Key Components ### D1 — [LTL-307EE](https://www.flux.ai/vasy_skral/ltl-307ee~a2.md) - Role: Indicator - Role Details: 5mm red LED driven by NE555 output through current-limiting resistor - Manufacturer Part Number: LTL-307EE - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/1153/LTL-307EE.pdf - Part Type: LED - Manufacturer Name: Lite-On Inc. - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - K [pin 1] ### J1 — [967](https://www.flux.ai/jharwinbarrozo/967~fk9.md) - Manufacturer Name: Keystone Electronics - Datasheet URL: https://www.keyelco.com/userAssets/file/K75p36.pdf - Role Details: 9V block battery snap connector feeding on/off switch - Role: Power Input - Manufacturer Part Number: 967 - Part Type: Connectors **Pins:** - NEG [pin 2] - POS [pin 1] ### SW1 — [L101011MS02Q](https://www.flux.ai/adrian95/l101011ms02q~ck2.md) - Datasheet URL: https://www.ckswitches.com/media/1423/l.pdf - Role Details: Disconnects 9V battery positive from the switched 9V rail - Role: Power Switch - Manufacturer Name: C&K - Part Type: Switch - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: L101011MS02Q **Pins:** - 1 [pin 1] - 2 [pin 2] ### U1 — [NE555P](https://www.flux.ai/adrian95/ne555p~870.md) - Role Details: NE555 astable timer generating approximately 1 Hz square wave from switched 9V rail - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fse555 - Manufacturer Part Number: NE555P - Part Type: Integrated Circuit - Role: Oscillator - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Texas Instruments - Symbol Style: parametric-v1 **Pins:** - CONT [pin 5] - DISCH [pin 7] - GND [pin 1] - OUT [pin 3] - RESET [pin 4] - THRES [pin 6] - TRIG [pin 2] - VCC [pin 8] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/bryan/1-hz-555-led-blinker~5hv](https://www.flux.ai/bryan/1-hz-555-led-blinker~5hv).* --- *Generated from [https://www.flux.ai/bryan/1-hz-555-led-blinker~5hv](https://www.flux.ai/bryan/1-hz-555-led-blinker~5hv)*