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.
A. 1880
B. 1750
C. 1370
D. 1580
Answer:A
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.
A. 1880 B. 1750 C. 1370 D. 1580
Explanation: Given, N1/N2=35; Gain of amplifier = 50.Therefore, the overall gain of the circuit = 50×35 =1750. 11. Determine the work done by the intercom system depending on the position of the switch