555 one shot circuit

555 One Shot Circuit | Monostable Multivibrator | 555 timer project

555 IC Project

Hey techies, welcome back to Techatronic. We are back with another new post on 555 timer IC. Today we are going to teach you about the monostable mode of the 555 timer ic.


Using this concept we are going to make a 555 one-shot circuit using a push button. In this one-shot circuit, there is a push button that we can use for turning the LED on.

Instead of a breadboard, you can also make this circuit on a PCB but it is easier to work on a breadboard. We are sharing all the necessary details about how you can make your own circuit,

just read the article carefully to make this 555 timer project. You can also check out more projects on Arduino and IoT. So are you excited to make this?

Working of the Monostable Multivibrator

555 one shot circuit

In the monostable mode, we got one stable state and one quasi-stable state.

It is also called a 555 one-shot circuit.

  • When you press the push button the LED will go on instantly and will keep on for a second or more.
  • The glowing time can be increased or decreased by changing the values of the resistor.
  • The LED will keep on after releasing the push button,
  • it is because of the charge stored by the capacitor that we used in this circuit.
  • Provide the 5 volts dc supply to the breadboard and then press the push button.
  • We have also made the fastest finger first circuit using 555 timer ic for organizing quiz competitions.
  • Just do the proper connections as given in the diagram and make sure that the connections are tight.

Components Required

monostable multivibrator
  • 555 timer ic
  • Push-button and an LED
  • Resistors 10K, 1K ohm
  • Capacitor 1000 uF
  • Connecting wires and a breadboard

monostable multivibrator Circuit Diagram

555 one shot circuit

Place the 555 timer ic on the breadboard and mark the pin numbers in your mind.

  • Connect pin 8 of the ic to the positive rail on the breadboard and pin 1 to the negative rail on the breadboard. Attach a wire between pin numbers 6 and 7.
  • Connect pin 2 of the ic with the first pair of interconnected pins of the push button.
  • Join the second pair of interconnect pins of the push button with the negative rail on the breadboard.
  • Join pin 2 of the ic with the negative rail via a 10-k ohm resistor.
  • Connect a 1-k ohm resistor between pin 7 and positive rail.
  • Now take a 1000 uF capacitor and connect its positive leg with pin 6 of the ic
  • and negative leg with the negative rail. Connect a 1-k ohm resistor to pin 3 that is the output pin of the 555 timer ic.
  • Join the positive leg of the LED with the resistor and the negative leg to the negative rail. Your circuit is ready to use now.

Let’s test the circuit

monostable multivibrator Circuit Diagram

We hope that you understand the concept behind the monostable mode of a 555 timer ic. If you have any doubts regarding this project then feel free to communicate with us in the comments section given below.

Well if you want to read more articles, click here to check tutorials on Arduino and Raspberry Pi.

Thanks for reading.

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