Explanation: When LM380 audio power amplifier is used in an RF-sensitive environment, an RC combination should be added at the output terminal (Pin 8) to eliminate 5 to 10-MHz oscillation. 9. Which amplifier provides twice output swing as that of LM380 amplifier?
A. Hybrid power amplifier
B. Bridge power audio amplifier
C. Monolithic power audio amplifier
D. Dual power amplifier
Answer:A
Explanation: When LM380 audio power amplifier is used in an RF-sensitive environment, an RC combination should be added at the output terminal (Pin 8) to eliminate 5 to 10-MHz oscillation. 9. Which amplifier provides twice output swing as that of LM380 amplifier?
A. Hybrid power amplifier B. Bridge power audio amplifier C. Monolithic power audio amplifier D. Dual power amplifier
Explanation: In bridge power audio amplifier, two LM380s are used in bride configuration. Therefore, the maximum output voltage swing will be twice that of a single LM380 amplifier. 10. A LM380 power amplifier is used in a intercom system with amplifier gain = 50 and the transformer turns ratio is given as 35.Find the overall gain of the circuit.