Question Bank (2 marks) · Q17
Q.Why does transformer coupled amplifier produce humming noise?
Karnataka PUCTextbookShort· 2mImportance★★★★★est
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Transformer coils pick up stray (mains) magnetic fields, inducing a hum.
A transformer works by magnetic coupling, so its windings are sensitive to any changing magnetic field around them, not just the signal. Stray magnetic fields — especially the alternating field from the power mains at 50 Hz — induce small unwanted voltages in the transformer windings. These induced voltages are amplified along with the signal and are heard as a humming noise in the output. …
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