# 555 LED Blinker ## Description 9V battery-powered 555 astable timer circuit that blinks a through-hole red LED at about 1 Hz through an on/off switch. ## Project Details - **Owner:** dacre - **Created:** 5/1/2026 - **Last Updated:** 5/1/2026 - **Visibility:** Public - **Human Interface:** On/off switch and blinking 5mm red LED indicator - **Implementation Details:** Through-hole hand-solderable 9V NE555 astable LED blinker; R1=47kΩ, R2=47kΩ, C1=10uF sets f≈1.02Hz; R3=680Ω limits red LED current; includes 100nF VCC decoupling, 10nF CONT bypass, and 10uF bulk capacitance. - **Power Requirements:** 9V PP3/block battery via SPST on/off switch ## Key Components ### J1 — [967](https://www.flux.ai/jharwinbarrozo/967~fk9.md) - Part Type: Connectors - Role: Power Input - Role Details: 9V PP3 battery snap connector, through-hole - Manufacturer Name: Keystone Electronics - Datasheet URL: https://www.keyelco.com/userAssets/file/K75p36.pdf - Manufacturer Part Number: 967 **Pins:** - NEG [pin 2] - POS [pin 1] ### LED1 — [LTL-307EE](https://www.flux.ai/vasy_skral/ltl-307ee~a2.md) - Forward Voltage: 2V - Manufacturer Name: Lite-On Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/1153/LTL-307EE.pdf - Role Details: Red 5mm through-hole LED blinking at 1 Hz - Role: Visual Indicator - Part Type: LED - Manufacturer Part Number: LTL-307EE **Pins:** - A [pin 2] - K [pin 1] ### SW1 — [L101011MS02Q](https://www.flux.ai/adrian95/l101011ms02q~ck2.md) - Part Type: Switch - Role: Power Switch - Datasheet URL: https://www.littelfuse.com/assetdocs/littelfuse-ck-slide-l-series-datasheet?assetguid=b0eee6fb-c634-4a1e-9e34-22a5c4b081c8 - Manufacturer Part Number: L101011MS02Q - Manufacturer Name: C&K - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: SPST latching on/off switch for battery positive rail **Pins:** - 1 [pin 1] - 2 [pin 2] ### U1 — [NE555P](https://www.flux.ai/kicad-part-library/ne555p~vhf.md) - Package or Case Code: DIP-8_W7.62mm - Operating Voltage: 9V - Manufacturer Name: Texas Instruments Inc. - Manufacturer Part Number: NE555P - Domain: Consumer Electronics - Role: Signal Generation - Part Type: Precision Timer - Role Details: Astable oscillator for 1 Hz red LED blink - Datasheet URL: http://www.ti.com/lit/ds/symlink/ne555.pdf **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/dacre/555-led-blinker~ty2](https://www.flux.ai/dacre/555-led-blinker~ty2).* --- *Generated from [https://www.flux.ai/dacre/555-led-blinker~ty2](https://www.flux.ai/dacre/555-led-blinker~ty2)*