PCB Design for Blinking LED

flux

Work done
  • Built the full schematic for the 1 Hz 555 LED Blinker:
    • J1 Keystone 967 9V battery connector
    • SW1 through-hole SPST on/off switch
    • U1 NE555P DIP-8 timer in astable mode
    • D1 5 mm red through-hole LED
    • R1 = 10kΩ, R2 = 68kΩ, C1 = 10uF timing network
    • R3 = 680Ω LED current-limit resistor
    • C2 = 100nF VCC decoupling and C3 = 10nF control-pin bypass
  • Wired the battery, switch, NE555 astable, LED output, decoupling, and ground connections.
  • Set the generic passives to through-hole package formats from the supported Flux package list, including axial resistors, radial timing capacitor, and ceramic disc capacitors.
  • Updated the Project Specification document with architecture, values, calculations, layout requirements, and verification plan.
  • Simulated the blinker behavior:
    • Output frequency: 0.988 Hz
    • Period: 1.012 s
    • Duty cycle: 53.4%
    • LED on-current: 10.36 mA
    • Result: meets the ~1 Hz blink target with safe indicator LED current.
  • Configured the PCB:
    • 50 mm x 50 mm rectangular board
    • 2-layer stackup
    • 0.5 mm trace width and 0.25 mm clearance/keepout
  • Placed all components on the top side with hand-solder-friendly spacing:
    • Battery connector near the left edge
    • Switch near the top edge
    • NE555 and timing parts near the center
    • LED near the right edge for visibility
  • Auto-routed the board successfully.
  • Ran schematic/layout checks:
    • ERC: passed
    • DRC checks for airwires, overlapping copper, missing footprints, invalid layers, floating copper, and trace corner radius: passed
Success criteria review
  • ✅ 9V battery connector, on/off switch, NE555 astable circuit, and red LED blinker included.
  • ✅ Timing values produce approximately 1 Hz blink rate.
  • ✅ Components are through-hole / hand-solder-oriented.
  • ✅ PCB is a 50 mm x 50 mm, 2-layer board.
  • ✅ Components are placed and routed.
  • ✅ ERC/DRC review checks passed with no reported errors.
Next steps
The design is ready for final human visual inspection and manufacturing export. If you want, I can next generate the manufacturing package: Gerbers, drill files, BOM, and pick-and-place/assembly outputs.
Generate manufacturing files
Export layout PDF
Review timing circuit
Verify BOM details
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U1
SW1 2 - U1 VCC
R3 P2 - D1 A
R2 P2 - C1 P1
SW1 2 - U1 VCC
U1 CONT - C3 P1
U1 OUT - R3 P1
SW1 2 - U1 VCC
J1 POS - SW1 1
R2 P2 - C1 P1
U1 CONT - C3 P1
R1 P2 - R2 P1
SW1 2 - U1 VCC
J1 POS - SW1 1
U1 OUT - R3 P1
R3 P2 - D1 A
R1 P2 - R2 P1
R3
Resistance
680Ω
GND
SW1
D1
GND
J1
GND
GND
C3
Capacitance
10nF

1 Hz 555 LED Blinker

1 Hz 555 LED Blinker thumbnail
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.

Properties

Properties describe core aspects of the project.

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