555 LED Blinker Circuit Design

flux

Selected a TI NE555P in PDIP-8, a 5 mm through-hole red LED, a PCB 9V holder, and a through-hole slide switch. Timing values R1=1kΩ, R2=680kΩ, C1=1µF give about 1.06 Hz; LED resistor will be 680Ω for a conservative hand-solderable 9V build.

flux

Done — I created the through-hole 9V 555 LED blinker schematic and renamed the project 1 Hz 555 LED Blinker.
Summary:
  • NE555P PDIP-8 astable oscillator
  • 9V battery holder through slide on/off switch
  • Red 5 mm LED with 680Ω series resistor
  • Timing: R1 = 1kΩ, R2 = 680kΩ, C1 = 1µF → ~1.06 Hz blink rate
  • Added required 555 support caps: 10nF control bypass, 100nF VCC decoupling, 10µF bulk cap
  • ERC is clean; remaining airwires are expected because PCB placement/routing has not been done yet
I also created:
Next step is PCB layout: size the board, place the battery holder/switch/LED for access, keep the 555 passives close to U1, then route. Want me to go ahead with layout?
Proceed to layout
Set board size
LED at edge
Add mounting holes
Prioritize battery access
Sign up to send
R3
Resistance
680Ω
S1 1 - U1 VCC
R1 P2 - R2 P1
U1 OUT - R3 P1
R3 P2 - D1 A
C3
Capacitance
100nF
R2 P2 - U1 TRIG
R2
Resistance
680kΩ
S1
BT1 + - S1 2
S1 1 - U1 VCC
GND
  • Generic Inductor
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1 Hz 555 LED Blinker gPJ6 thumbnail
Through-hole 9V battery-powered 555 timer circuit that blinks a red LED approximately once per second using an on/off switch and hand-solderable components.

Properties

Properties describe core aspects of the project.

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