Easier Approach to Electronic Projects

Flashing LED using 555 Timer

The circuit is designed to use very little current to prolong battery life so that it can be left on permanently. A superbright’ red LED is used because this provides a bright flash with a low current.

If you want to use 4.5V supply by connecting 3 Alkaline cells or any other source, change the resistor along with LED from 3.3k to 1k for a better flash.

Note that AA cells will last longer than a 9V PP3 battery 😉

To flash two LEDs alternatively we have to increase the clock pulse speed to possibly fastest to have exact proper alternation.


Parts Required:

  1. 100k potentiometer
  2. 10k and 3.3k
  3. 10mF
  4. LED
  5. 555 Timer
  6. 9v Battery

Circuit Diagram:

There are three different modes to flash an LED using 555 Timer

and their bread board arrangements



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