Basic Op-Amp Circuits - Summing Amplifiers

5 important questions on Basic Op-Amp Circuits - Summing Amplifiers

Refer to Figure 13–66. Determine the following:
(a) V_R1 and V_R2
(b) Current through Rf
(c) V_OUT

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Find the value of Rf necessary to produce an output that is five times the sum of the inputs in Figure 13–66.

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Show a summing amplifier that will average eight input voltages. Use input resistances of 10 kΩ each.

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Find the output voltage when the input voltages shown in Figure 13–67 are applied to the scal ing adder. What is the current through Rf?

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Determine the values of the input resistors required in a six-input scaling adder so that the lowest weighted input is 1 and each successive input has a weight twice the previous one. Use Rf=100 kΩ

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