Explanation: A DC amplifier uses offset null circuitry to reduce the output offset voltage to zero, that is , to improve the accuracy of DC amplifier. 4. Why are coupling capacitor used in audio receiver system?
A. All of the mentioned
B. Thermal drift
C. Component tolerance
D. Variation in signal
Answer:A
Explanation: A DC amplifier uses offset null circuitry to reduce the output offset voltage to zero, that is , to improve the accuracy of DC amplifier. 4. Why are coupling capacitor used in audio receiver system?
A. All of the mentioned B. Thermal drift C. Component tolerance D. Variation in signal