A relaxation oscillator is a non-linear and non-sinusoidal oscillator that produces repetitive signal such as square wave or triangular wave. The 555 timer can be used as a relaxation oscillator. Following is the circuit diagram in Proteus professional software that produces square wave.


We can view the output signal waveform using an oscillator.


And simulating the circuit to see the following waveform in the oscilloscope.



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