Summing Amplifier Calculator
Calculate the output voltage of an inverting summing amplifier with up to three inputs.
V
V
V
kΩ
kΩ
Output Voltage
-6.000 V
Gain per Input-1.00 V/V
Output Voltage vs Input Voltage V1
Inverting Summing Amplifier
Formula (equal input resistors)
V_out = -(Rf / Rin) x (V1 + V2 + V3)
When Rf = Rin the output is simply the inverted sum. Different input resistor values allow weighted summation.
Example Calculation
Three inputs at 1 V, 2 V, 3 V with Rin = Rf = 10k.
- 01Sum = 1 + 2 + 3 = 6 V
- 02Gain = -10 / 10 = -1
- 03V_out = -1 x 6 = -6 V
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