Summing Amplifier Rechner — Formel

## 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.

Lösungsbeispiel

Three inputs at 1 V, 2 V, 3 V with Rin = Rf = 10k.

  1. Sum = 1 + 2 + 3 = 6 V
  2. Gain = -10 / 10 = -1
  3. V_out = -1 x 6 = -6 V