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Tuesday, July 28, 2020

How to make analog adjustable timer using 555 IC

In this project, I will show you how to make an analog timer using 555 Timer IC.

If you prefer video mode or like to watch the working of the circuit please click here to watch it on YouTube.

Parts List
  • 1 * 555 Timer
  • 1 * 100uF/25V Electrolytic Capacitor
  • 1 * 0.01uF Ceramic Capacitor
  • 1 * Push Button
  • 1 * 200, 330, 10K, 2.2M Ohm Resistors
  • 1 * Green and Red Led
  • 1 * Potentiometer
Theory

    For this project, the main components are 555 Timer. The 555 IC is a timer integrated circuit and can be operated in Astable or Monostable mode. For this project, I am using the monostable mode.

Circuit Diagram


How It Works?

    When you supply power to the circuit the timer starts running and the Green LED will be lit and once the timer runs down the Red Led will be lit.

The duration of the timer can be adjusted using the RV1 potentiometer.

The reset button is used to reset the timer after it has rundown down the time.

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