The pulsating d.c. applied to power amplifier causes________________?
Correct answer: B. Hum in the circuit
- A. Burning of transistor
- B. Hum in the circuit
- C. Excessive forward voltage
- D. None of the above
Explanation
Pulsating d.c. contains ripple at the supply frequency, which can couple into the audio signal and produce an audible hum. Filtering the supply reduces this hum.
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