1(c). Fig. 1(c) shows a public addressing system i.e. a voltage amplifier, its input is connected with a microphone (input signal source) and output is connected with a loud speaker (load). If the...

Extracted text: 1(c). Fig. 1(c) shows a public addressing system i.e. a voltage amplifier, its input is connected with a microphone (input signal source) and output is connected with a loud speaker (load). If the voltage of the microphone is 250mV determine the output voltage across the speaker. Assume that the voltage gain of the amplifier A, = 150, the input and output resistance of are R = 1.5kn and Ro = 1000 respectively. It is also assume that the microphone and speaker resistances are Rs = 1.0kN and R1 = 1500 respectively. Rs = 1.0 kN Ro = 100 N Vs = 250 mV R = Vi 1.5kN A, vi R1 = vo 1502 Microphone Loud Speaker Equivalent circuit of a voltage amplifier