PCB Design for Blinking LED

0:03

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

a day

SW1 2 - U1 VCC

R3 P2 - D1 A

Resistance

680Ω

Capacitance

10uF

R2 P2 - C1 P1

SW1 2 - U1 VCC

R2 P2 - C1 P1

SW1 2 - U1 VCC

Capacitance

100nF

R2 P2 - C1 P1

U1 CONT - C3 P1

U1 OUT - R3 P1

SW1 2 - U1 VCC

J1 POS - SW1 1

Resistance

10kΩ

R2 P2 - C1 P1

U1 CONT - C3 P1

R1 P2 - R2 P1

Resistance

68kΩ

R1 P2 - R2 P1

SW1 2 - U1 VCC

Capacitance

10nF

J1 POS - SW1 1

U1 OUT - R3 P1

R3 P2 - D1 A

R1 P2 - R2 P1

GND

SW1

GND

Reviews

Ground
A common return path for electric current. Commonly known as ground.
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Project Name

1 Hz 555 LED Blinker

Description

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.

Pricing & Availability

Distributor	Qty 1

Controls

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bryan / 1 Hz 555 LED Blinker

Schematic