# Brooks Through-Hole 9V 555 LED Blinker ## Description Through-hole 9V NE555 astable timer circuit that blinks a red LED about once per second using a battery and 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) - Part Type: Connectors - Role Details: 9V battery input connector feeding the on/off switch. - Datasheet URL: https://www.keyelco.com/userAssets/file/K75p36.pdf - Manufacturer Name: Keystone Electronics - Section: Power - Manufacturer Part Number: 967 - Role: Power Conversion **Pins:** - NEG [pin 2] - POS [pin 1] ### D1 — [LTL-307EE](https://www.flux.ai/vasy_skral/ltl-307ee~a2.md) - Manufacturer Name: Lite-On Inc. - Role: Signal Generation - Part Type: LED - Role Details: Red 5mm through-hole LED blink indicator driven by the NE555 output through R3. - Section: Digital I/O - Manufacturer Part Number: LTL-307EE - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/1153/LTL-307EE.pdf **Pins:** - A [pin 2] - K [pin 1] ### dacre_take_two — [Generic Resistor](https://www.flux.ai/jharwinbarrozo/generic-resistor~3e.md) - Resistance: 47000Ω - Package: H_AXIAL-P7.62_D2.5 - Tolerance: 5% - Manufacturer Name: Yageo - Part Type: Resistor - Section: Control - Role: Timing - Role Details: RA = 47kΩ; with R2 = 47kΩ and C1 = 10µF gives about 1.02 Hz. - Power Rating: 0.25W - Manufacturer Part Number: CFR-25JB-52-47K **Pins:** - P1 [pin 1] - P2 [pin 2] ### dacre_test — [Generic Resistor](https://www.flux.ai/jharwinbarrozo/generic-resistor~3e.md) - Manufacturer Part Number: CFR-25JB-52-680R - Power Rating: 0.25W - Role Details: Limits red LED current to roughly 10 mA from the 9V rail/output swing. - Part Type: Resistor - Tolerance: 5% - Manufacturer Name: Yageo - Role: Current Limiting - Section: Digital I/O - Package: H_AXIAL-P7.62_D2.5 - Resistance: 680Ω **Pins:** - P1 [pin 1] - P2 [pin 2] ### dacre_threee — [Generic Capacitor](https://www.flux.ai/jharwinbarrozo/generic-capacitor~1d.md) - Package: C_Disc_D5.0mm_W2.5mm_P5.00mm - Manufacturer Name: Xicon - Voltage Rating: 50V - Capacitance: 1e-8F - Role: Filtering - Part Type: Non-Polarized Capacitor - Manufacturer Part Number: 140-50V5-103Z-TB-RC - Section: Control - Role Details: 10nF capacitor from U1 CONT pin to GND to improve astable stability. - Capacitor Type: Ceramic **Pins:** - P1 [pin 1] - P2 [pin 2] ### S1 — [OS102011MS2QN1](https://www.flux.ai/adrian95/os102011ms2qn1~wd3.md) - Manufacturer Name: C&K - Role: Switching - License: https://creativecommons.org/licenses/by/4.0/ - Section: Power - Datasheet URL: https://www.ckswitches.com/media/1428/os.pdf - Role Details: SPDT slide switch used as an on/off switch between BATT_PLUS and the switched 9V rail. - Part Type: Switch - Manufacturer Part Number: OS102011MS2QN1 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### U1 — [NE555P](https://www.flux.ai/kicad-part-library/ne555p~vhf.md) - Datasheet URL: http://www.ti.com/lit/ds/symlink/ne555.pdf - Part Type: Precision Timer - Domain: Consumer Electronics - Role: Signal Generation - Role Details: NE555P astable oscillator, powered from switched 9V battery rail. - Package or Case Code: DIP-8_W7.62mm - Operating Voltage: 5V - Manufacturer Name: Texas Instruments Inc. - Section: Control - Manufacturer Part Number: NE555P **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/brooks-through-hole-9v-555-led-blinker~h6](https://www.flux.ai/brooks/brooks-through-hole-9v-555-led-blinker~h6).* --- *Generated from [https://www.flux.ai/brooks/brooks-through-hole-9v-555-led-blinker~h6](https://www.flux.ai/brooks/brooks-through-hole-9v-555-led-blinker~h6)*