This is the amplifier configuration I want you all to use for your project. It has 2 voltage amplifier stages using the 2N3904 and one power amplifier stage which amplifies current. The power amplifier stage has a special, 2 transistor connection called a Darlington Pair. The Vbe for this device is approximately 1.4 volts. Internally the betas multiply giving a very high current gain. The voltage gain of the power amplifier is close to 1. It has a very high input impedance because of the high Beta value and biasing resistors in the voltage divider. This is a CLASS A power amplifier. You will learn more about these in the next semiconductor class. The total voltage gain of the multistage amplifiers multiply. Atot = Astage1 x Astage2 x Astage3 (the letter 'A' represents the gain multiplication factor. An amplifier that has a gain of 10 (A = 10); if you put in 1mV, you get out 10mV at the output). 2. I am going to give you a step by step procedure to design the power amplifier stage. Example specifications a. Output power = 4 W b. Operating frequency 20 Hz to 20kHz 3. Determine the current and voltage at