An amplifier circuit using a bipolar transistor is shown in Figure Q5. (a) State, with a valid reason, whether this amplifier is an emitter follower or a common emitter configuration. (b) Redraw Figure Q5 as a large signal equivalent circuit. Show that: (c) Show that the input voltage, vISAT to produce the onset of saturation for T1 is given by: (d), confirm, by calculation, that T1 is in saturation. (e) Calculate the current in the lamp when T1 is in saturation and confirm the current is sufficient to light the lamp. CE CC CESAT SAT In the circuit of Figure Q5, Rc is now replaced by a lamp with a resistance of 500 Ω. At least 25 mA is required to light the lamp. The circuit is to be designed that the lamp is on for v, - 1 V. T, has Vcc 15 V, R -1.2 k2. β:J00, VCESAT-0.1 V, For v,-1V Rc CE v1 R GND Figure Q5 CE CC CESAT SAT In the circuit of Figure Q5, Rc is now replaced by a lamp with a resistance of 500 Ω. At least 25 mA is required to light the lamp. The circuit is to be designed that the lamp is on for v, - 1 V. T, has Vcc 15 V, R -1.2 k2. β:J00, VCESAT-0.1 V, For v,-1V Rc CE v1 R GND Figure Q5