Here's how to build a simple LED blinker using a 555 timer. The 555 timer is configured as an astable multivibrator, which means the output will turn on and off repeatedly. With the chosen values, it will turn on and off about five times per second. Since the LED is connected to the output, it blinks =)
The Circuit
R1, R2, and C1 sets the blinking speed. Higher values means slower blinking.
R3 is there to limit the current for the LED.
Parts List
| Reference | Value |
|---|---|
| Battery | 9V |
| C1 | 10µF |
| D1 | Red LED |
| R1 | 10k |
| R2 | 10k |
| R3 | 1k |
| U1 | 555 Timer |
The Layout
