Inverting Op-Amp Resistor Calculator

The Formula

The formula for calculating the gain of an inverting op-amp is:

\[Gain = -\frac{R2}{R1}\]

Where:

• Gain: The amplification factor of the circuit (negative due to inversion)
• R1: The input resistor
• R2: The feedback resistor

Calculation Steps

1. Determine the desired gain (use absolute value)
2. Choose a value for R1
3. Calculate R2 using the formula: R2 = Gain * R1

Example Calculation

Let's calculate R2 for an inverting op-amp with a desired gain of 10 and R1 = 1kΩ:

\[R2 = 10 * 1000\Omega = 10000\Omega = 10k\Omega\]

Circuit Diagram

This diagram shows an inverting op-amp circuit with the calculated resistor values for a gain of -10.