Hey geeks, hope you are doing fine. Do you know how a 555 timer ic will work in astable mode?
well if not then don’t worry we are here for you. In this article, we are going to make a square wave generator using the astable mode of a 555 timer ic.
Both the states in the astable mode are unstable so the output continuously changes between these two states. Mostly 555 timer ic in the astable mode are used in the making of the oscillators (relaxation oscillators).
Working of the Square Wave Generator
- Let’s talk about the internal structure of the 555 timer ic, so there are two comparators and a flip flop inside it which are responsible for generating the output.
- The comparators generate the logic signals as per the voltage of the charging and discharging of the capacitor and the supply voltage. At the output, we are receiving a square wave.
- The duty cycle of the square wave will depend on the resistors used in the circuit.
- We have connected an LED at the output pins of the 555 timer ic. Connect a 5 volts dc supply to the negative and positive rails of the breadboard.
- You can connect an LED, a speaker, or a CRO at the output pins. We are using an LED in this project.
You can also check out the electronic mosquito killer using 555 ic made by us.
- 555 timer ic
- Connecting wires and a breadboard
- Resistors 1K, 100K ohm
- Capacitors 10 nF and 1 uF
Square wave generator Circuit Diagram
Take a 555 timer ic and place it on the breadboard.
- Identify the pin numbers by finding the notch on the top of the ic.
- Then connect pin 1 of the ic to the negative rail of the breadboard.
- Join pin 8 of the ic to the positive rail of the ic.
- Attach a wire between pins 4 and 8.
- Take a 10 nF capacitor and connect its positive leg with the pin 5 of the ic and negative leg with the negative rail of the breadboard.
- Join pins 2 and 6 together. Connect a 1 uF capacitor with its positive leg to pin number 2 and the negative leg to the negative rail.
- Attach a 1K ohm resistor between pin 7 of the ic and the positive rail.
- Join pins 6 and 7 via a 100K ohm resistor. Use pin number 3 and the negative rail of the breadboard as the output pins.
- Now your circuit is ready for testing. You will get a square wave output at the output pins.
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Let’s test the Circuit
We hope that you understand the working of the square wave generator using the astable mode of 555 timer ic.
Thanks for reading.