# 1 Hz 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:** ingeniera-olvera - **Created:** 7/6/2026 - **Last Updated:** 7/7/2026 - **Visibility:** Public ## Key Components ### BT1 — [BH9VPC](https://www.flux.ai/adrian95/bh9vpc.md) - Role Details: 9V PP3 block battery holder; positive feeds SW1, negative is GND. - Datasheet URL: https://www.memoryprotectiondevices.com/datasheets/BH9VPC/BH9VPC-datasheet.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Voltage: 9V - Manufacturer Part Number: BH9VPC - Role: Energy Storage - Manufacturer Name: MPD - Part Type: Battery Holder **Pins:** - - [pin -] - + [pin +] ### D1 — [LTL-307EE](https://www.flux.ai/vasy_skral/ltl-307ee~a2.md) - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/1153/LTL-307EE.pdf - Manufacturer Part Number: LTL-307EE - Role: Signal Generation - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED - Role Details: Red through-hole LED indicator driven by U1 OUT through R3. - Forward Voltage: 2.0V - Manufacturer Name: Lite-On Inc. **Pins:** - A [pin 2] - K [pin 1] ### SW1 — [AS11CH](https://www.flux.ai/adrian95/as11ch~i2s.md) - Role: Switching - Part Type: Switch - Role Details: On/off power switch in series with the 9V battery positive lead. - Datasheet URL: https://www.nkkswitches.com/pdf/Aslides.pdf - Manufacturer Part Number: AS11CH **Pins:** - P1 - P3 ### U1 — [NE555P](https://www.flux.ai/adrian95/ne555p~870.md) - Operating Voltage: 9V - Manufacturer Part Number: NE555P - Role: Signal Generation - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fse555 - Symbol Style: parametric-v1 - Role Details: NE555P DIP-8 astable oscillator powered from switched 9V; output drives LED once per second. - Part Type: Integrated Circuit - Package: DIP-8 - Manufacturer Name: Texas Instruments - License: https://creativecommons.org/licenses/by/4.0/ **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/ingeniera-olvera/1-hz-555-led-blinker~kx](https://www.flux.ai/ingeniera-olvera/1-hz-555-led-blinker~kx).* --- *Generated from [https://www.flux.ai/ingeniera-olvera/1-hz-555-led-blinker~kx](https://www.flux.ai/ingeniera-olvera/1-hz-555-led-blinker~kx)*