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10 cards from this deck
Amplifies multiple input signals independently
Audio mixers
Virtual earth
Vout=−Rf(V1R1+V2R2+...)V_{\text{out}} = -R_f(\frac{V_1}{R_1} + \frac{V_2}{R_2} + ...)Vout=−Rf(R1V1+R2V2+...)
Output is inverted relative to inputs
Finds difference between two input signals
Vout=(V+−V−)RfR1V_{\text{out}} = (V_+ - V_-)\frac{R_f}{R_1}Vout=(V+−V−)R1Rf
Noise cancellation
50 Hz mains interference
Often equal for equal weighting of signals
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