Q1: FIGURE 1 shows the block diagram of an electronic system required to give the output

Fig 1

V_o = 8V₄ + 4V₃ + 2V₂ + V₁

(a) Sketch a suitable op-amp circuit to give the required output and show the required resistor ratios.

(b) Suggest an application for the circuit.

Q2: FIGURE 2 shows an op-amp circuit where R_p is a 10 kΩ potentiometer.

Determine the gain, V_o/V_in, of the amplifier for when
(a) x = 0
(b) x = 0.7
(c) x = 1.

Fig 2