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Ex. 4 The two-stage voltage amplifier in of the previous exercise become swamped by splitting the 4700 emitter resistor into an re =10002 and an RE = 3700 draw the new circuit (2) and calculate the Zin(base) (1), the Zin(stage)(1) and the ac collector voltage of the first stage(1), the total gain AV (2) and the ac output voltage across the load resistor vout (2). How does the ac output voltage across the load resistor in the previous exercise compare the one found in this exercise what are the benefits(1)? [10 points] Ex. 5 In the previous exercise, a variable feedback resistor is added between the second stage and the first stage. Draw the new circuit (3) and find the minimum gain AVmin(1) and maximum AVmax (1) gain if the variable resistor is made up of a fixed Rf = 1k0 [5 points) and a variable Rv=0-10 kO.