# Through-Hole 555 LED Blinker ## Description Hand-solderable 9V battery powered 555 timer circuit that blinks a red LED once per second through an on/off switch. ## Project Details - **Owner:** brooks - **Created:** 5/15/2026 - **Last Updated:** 5/15/2026 - **Visibility:** Public ## Key Components ### BT1 — [967](https://www.flux.ai/jharwinbarrozo/967~fk9.md) - Role: Power Conversion - Part Type: Connectors - Role Details: 9V battery input connector; expected circuit current is under 25mA peak including LED and timer. - Manufacturer Name: Keystone Electronics - Manufacturer Part Number: 967 - Datasheet URL: https://www.keyelco.com/userAssets/file/K75p36.pdf **Pins:** - NEG [pin 2] - POS [pin 1] ### D1 — [LTL-307EE](https://www.flux.ai/vasy_skral/ltl-307ee~a2.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Red LED indicator driven by the 555 output once per second. - Manufacturer Part Number: LTL-307EE - Role: Switching - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/1153/LTL-307EE.pdf - Part Type: LED - Manufacturer Name: Lite-On Inc. **Pins:** - A [pin 2] - K [pin 1] ### SW1 — [AS11CH](https://www.flux.ai/adrian95/as11ch~i2s.md) - Role: Switching - Role Details: Main on/off switch for the 9V battery supply; expected circuit current is under 25mA peak. - Manufacturer Part Number: AS11CH - Datasheet URL: https://www.nkkswitches.com/pdf/Aslides.pdf - Part Type: Switch **Pins:** - P1 - P3 ### U1 — [NE555P](https://www.flux.ai/kicad-part-library/ne555p~vhf.md) - Part Type: Precision Timer - Manufacturer Part Number: NE555P - Operating Voltage: 5V - Domain: Consumer Electronics - Role: Signal Generation - Package or Case Code: DIP-8_W7.62mm - Manufacturer Name: Texas Instruments Inc. - Role Details: PDIP-8 555 timer powered from switched 9V battery; configured as an astable oscillator. - 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/brooks/through-hole-555-led-blinker~js](https://www.flux.ai/brooks/through-hole-555-led-blinker~js).* --- *Generated from [https://www.flux.ai/brooks/through-hole-555-led-blinker~js](https://www.flux.ai/brooks/through-hole-555-led-blinker~js)*