Keywords: Op-Amp Summing Amplifier.svg A circuit diagram of a summing amplifier made using an operational amplifier <math> V_\mathrm out - R_\mathrm f \left V_1 \over R_1 + V_2 \over R_2 + \cdots + V_n \over R_n \right </math> own 2009-01-26 Inductiveload Own work all rights released Public domain Operational amplifier circuits |