Uploaded March 2026 | Updated September 2026, 2 weeks ago

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In this excerpt from Elektor Engineering Insights, Roberto Armani demonstrates a quick way to check an audio amplifier with a square-wave signal and an oscilloscope. What looks fine with a sine wave immediately reveals a problem when the square wave is applied. As Roberto explains the waveform, he shows how a faulty loudness switch affects frequency response and why this old-school technique is still a useful diagnostic shortcut.

Watch the full episode here: youtube.com/watch?v=8G1JlfRxg_c

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#TestAndMeasurment #Audio #Amplifiers