73K views · 843 reactions | This Simulation shows a square wave in both time and frequency domains. In the time domain, sharp edges include harmonic content, while in the frequency domain, these appear as distinct peaks at odd harmonics. This illustrates how complex signals are built from simpler sine waves. #electronicsrd #ElectronicsEducation #FFT | Electronics - R&D | Facebook

This simulation shows a summing amplifier combining the first five harmonics of a sine wave to approximate a square wave. Each input provides a sine wave at an odd multiple of the fundamental frequency (1st, 3rd, 5th, 7th, and 9th harmonics), and the op-amp sums them together. According to Fourier series theory, adding these harmonics with the correct amplitude ratios produces a waveform that closely resembles a square wave, as seen in the oscilloscope output at the bottom trace. #ElectronicsEdu