Design a feasible class A silicon BJT Power Amplifier that provides a high voltage gain using 15 volts supply and employs a concept to increase its loaded efficiency to 50% so that little power lo

Design a feasible class A silicon BJT Power Amplifier that provides a high voltage  

gain using 15 volts supply and employs a concept to increase its loaded efficiency to  

50% so that little power loss is provided at the collector terminal.

Given by manufacturer for safe operation, the amplifying component has a DC  

current gain of 200 and a collector current limit of 4mA. The output stage of the  

Amplifier drives a headphone with 32-ohms load impedance applicable for  

smartphones.