# Hi-fi audio amplifiers are usually built as discrete operational amplifiers with a relatively large gain (g500)...

###### Question:

Hi-fi audio amplifiers are usually built as discrete operational amplifiers with a relatively large gain (g500) and with feedback that reduces the closed-loop gain to a smaller value k-32. Since loudspeakers predominatly act like a resistor (nominal impedance: 82) with an inductor in series, the feedback network can be used to improve the frequency response in the audio range up to 20 kHz. We are primarily concerned with gain and frequency response of the amplifier Amp Vour(s) Rt R2 C1 Feedback GFB(s) Discrete operational Vour(s) 1 V(s) GFB(s) Figure : Siplfied schematic (A) and block diagram representation (B) of a hi-fi ampli fier output stage with feedback network and loudspeaker impedance. The magnetic force that drives the membrane is proportional to the coil current Isp, and the coil current is therefore the output variable that we are interested in. B. with manufacturer tolerances, the internal gain g can vary between 300 and 700. What is the range of variation for k? 5 points)

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