LED Blinker Circuit Design

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Schematic: 9V NE555 ~1 Hz LED blinker is built and wired Parts added (all through-hole)
  • Timer: U1 (NE555 DIP-8)
  • Power input: BT1 (9V snap)
  • On/off: S1 (SPST-NO tactile used as series switch)
  • Timing network: R1 (10k), R2 (68k), C1 (10uF)
  • Decoupling: C2 (100nF)
  • LED output: LED1 (red LED), R3 (1k)
Key connections (NE555 astable)
  • Power: BT1 -> S1 -> U1 VCC, with C2 across VCC/GND
  • Astable: U1 TR+THR tied to timing node, R1/R2/C1 wired in standard astable configuration
  • Output: U1 Q -> R3 -> LED1 -> GND
Timing check
  • With R1=10k, R2=68k, C1=10uF, the calculated frequency is 0.988 Hz (about 1 blink/second).
PCB
  • A basic PCB outline was set to 60 mm x 40 mm (grid 2.54 mm) to suit through-hole, hand-solderable layout.
Remaining note
  • ERC still flags “Missing Power” on U1 (tool-side power-source classification issue), but electrically VCC is connected to the battery/switch chain and decoupled by C2.
S1 1 - S1 2
S1 1 - S1 2
U1 TR - U1 THR
U1
S1
BT1
U1 TR - U1 THR
S1 1 - S1 2
LED1
GND
S1 1 - S1 2
S1 1 - S1 2
R3 P2 - LED1 1
S1 1 - S1 2
U1 DIS - R1 P2
S1 1 - S1 2
U1 TR - U1 THR
U1 TR - U1 THR
S1 1 - S1 2
S1 1 - S1 2
U1 DIS - R1 P2
S1 1 - S1 2
S1 1 - S1 2
S1 1 - S1 2
U1 DIS - R1 P2
U1 Q - R3 P1
R3 P2 - LED1 1
S1 1 - S1 2
U1 Q - R3 P1
GND
GND
C2
Capacitance
100nF
GND
GND
R2
Resistance
68kohm
R1
Resistance
10kohm
C1
Capacitance
10uF
R3
Resistance
1kohm
GND
GND

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    9V NE555 1 Hz LED Blinker (THT)

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