QUESTION 1 A) The transistor switch circuit shown in Figure 1A is activated by a mechanical switch SW. The transistor model parameters are VBEon = 0.7V, KCE194 = 0.2V, and ßr lies in the range [120, 400]. The on-voltage for the LED is VRen = 1.5V. The circuit is designed so that 50mA of current flows through the LED when the mechanical switch SW is open. i. Find the largest value for R3 that can be used while still ensuring the transistor saturates when it is turned on. ii. Find the required value for Rp. +6V R. SW Figure 1 A

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BJT (Bipolar Junction Transistor)

A BJT is a semiconductor device with 3 terminals that consist of a p-n junction diode that can amplify the signal or current. It is a current-controlled device. The three BJT terminals are base, collector, and emitter. The BJT works with the charge carrier, the two type of carriers in the BJT are holes and electrons, the charge carriers flow by the process of recombination. The signal to be amplifier is generally given as the input at the base terminal and an amplified form of it is available at the collector terminal.