The circuit in Fig. P5.24 is a noninverting summing amplifier. Assume the op amp is ideal. Design the circuit so that
vo = va + 2vb + 3vc.
a) Specify the numerical values of Ra and Rc.
b) Calculate ia and (in microamperes) when va = 0.7 V, vb = 0.4 V, and vc = 1.1 V.
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