Another form of the bridge power amplifier is shown in Figure P15.71. This amplifier has a very high input resistance since the input is to the noninverting terminal of an op-amp.

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

(b) Design the circuit to provide a gain of \(A_{v}=10\) so that the magnitudes of \(v_{o 1}\) and \(v_{02}\) are equal. Let \(R_{1}=50 \mathrm{k} \Omega\).

(c) If \(R_{L}=20 \Omega\) and if the average power delivered to the load is \(10 \mathrm{~W}\), determine the peak amplitude of \(v_{o 1}\) and \(v_{o 2}\) and the peak load current.

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