Search Ctrl K
Home / Tools
THE FEUTEX TOOLKIT

Two-Input Summing Amplifier

Combine two analog channels with distinct resistor weights.

Electronics workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaVout=−Rf(V1/R1+V2/R2)
Sources and model references

Worked example

Inputs

Input one
1 V
Input two
2 V
Input resistor one
1000 ohm
Input resistor two
2000 ohm
Feedback resistor
1000 ohm

Expected results

Output voltage
-2 V
Noise gain
2.5 V/V

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter the labeled inputs in the indicated units.
  2. Calculate and compare every output against the stated model assumptions.

Try this example

{
  "v1": 1,
  "v2": 2,
  "r1": 1000,
  "r2": 2000,
  "rf": 1000
}

Accuracy and scope

Ideal summing amplifier with grounded non-inverting input; rail limits excluded. Simplified analytical model; not a design recommendation or safety certification.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.