Topic
Signals
2 articles on signals: the maths or physics explained, ready-to-teach lesson plans, and how to build each slide in Tracé.
Fourier Series: How Sine Waves Build a Square WaveAdd sin x, sin 3x / 3, sin 5x / 5… and a square wave appears. The formula, why only odd harmonics, the 9% Gibbs overshoot, and a click-by-click slide.
QAM Constellation Diagrams, Explained (BPSK to 256-QAM)What a constellation diagram shows, why 256-QAM needs a cleaner channel than QPSK, Gray coding, noise and phase errors, with animated examples.