Q.1 A simple transistor buffer is required to drive a length of coaxial cable having a capacitance of 100 pF m of cable. The total steady-state power dissapation of the buffer must not exceed 250 mW and the propagation delay (defined as the time taken for the output to go from Vcc to Vcc/2 for a length of cable) must not exceed 100 ns. The buffer is to be driven by a TTL logic gate. If a transistor is available which has a minimum F of 50 and V 0.8 V, determine the maximum length of cable that can be driven. Q.2 A buffer circuit is required to drive the piezo-electric buzzer in a door alarm system. The door mechanism generates a TTL logic compatible output signal and can provide 10 mA of output current where Vo = 2.4V. The output signal is HI when the alarm should be activated. The buzzer operates from 12 V supply and has an equivalent load resistance of R = 80 and a negligible inductance. A transistor is available which has a nominal 3 = 100 and VBE = 0.8 V. Design an appropriate buffer circuit, explaining the rationale of your design and determining the values of all components used.