Summing Amplifier Calculator

Calculate output voltage for an inverting summing amplifier circuit.

Circuit Parameters

Number of Inputs

Rf (Feedback Resistor) - Ohms

V1 (Volts)

R1 (Ohms)

V2 (Volts)

R2 (Ohms)

Output Voltage

-3.0000 V

Vout = -Rf * (V1/R1 + V2/R2 + ...)

Individual Contributions

Channel 1 (Gain: -1.00)-1.0000 V

Channel 2 (Gain: -1.00)-2.0000 V

Formula

Vout = -Rf * (V1/R1 + V2/R2 + V3/R3 + ...)

With equal resistors, this becomes: Vout = -1.0 * (V1 + V2 + ...)