Flashing LED using 555 Timer

Demonstration 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…

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Demonstration

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:

  • 10k & 3.3k
  • 100mF
  • Bright LED
  • 100k potentiometer
  • 555 Timer
  • 9v Battery

Circuit Diagrams:

Bread Board Arrangements

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