1. Draw a transformer-coupled class A amplifier circuit that drives an 8-Ω speaker through a 4:1 transformer. Using a power supply of VCC = 30 V, the circuit delivers 4 W to the load. Also, calculate:
a. P(ac) across transformer primary;
b. VL(ac);
c. V(ac) at transformer primary;
d. The rms values of load and primary current; and
e. The efficiency of the circuit if the bias current is ICQ = 140 mA.
2. What is the cost of abandoned and busy signal calls for a typical Monday day? Annually?
