Figure P15.72 shows an audio amplifier using two identical op-amps connected in a bridge configuration.

(a) Derive the expression for the voltage gain \(A_{v}=v_{L} / v_{I}\).

(b) Design the system such that \(\left|v_{O 1}\right|=\left|v_{O 2}\right|=12 v_{I}\). The largest resistor value is to be limited to \(120 \mathrm{k} \Omega\).

(c) If \(R_{L}=25 \Omega\) and the peak op-amp output voltages are limited to \(\pm 8 \mathrm{~V}\), determine (i) the maximum average power that can be delivered to the load and (ii) the peak currents that each op-amp must source or sink.

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+ Vol A www R ww R www R4 R1. www +51 R3 ww 12 102 Figure P15.72