Understanding the Op Amp Calculator

An Operational Amplifier (Op Amp) is a high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output. This tool helps you calculate the theoretical output voltage and gain for the two most common configurations: Inverting and Non-Inverting.

How to Use This Tool

To calculate the output voltage, follow these simple steps:

• Select Configuration: Choose between Inverting (output is phase-shifted by 180°) or Non-Inverting (output is in phase).
• Enter Input Voltage: Provide the voltage level being fed into the circuit.
• Define Resistor Values: Enter the values for R₁ (input resistor) and R_f (feedback resistor) in Ohms.
• Analyze Steps: The calculator will display the Gain formula, the math behind it, and the final result.

Formulas and Mathematics

In an Inverting Amplifier, the formula for gain is A_v = -(R_f / R₁). The negative sign indicates that the output signal is inverted. The output voltage is then V_out = V_in × A_v.

In a Non-Inverting Amplifier, the gain is calculated as A_v = 1 + (R_f / R₁). This configuration results in a positive gain, meaning the output voltage follows the same polarity as the input.

Frequently Asked Questions (FAQs)

Q: Can the output voltage exceed the power supply?
A: No. In real-world circuits, the output voltage is limited by the Op Amp's supply rails (V_cc and V_ee). This calculator provides the theoretical value.

Q: What happens if R1 is zero?
A: Mathematically, gain becomes infinite. In practice, this would lead to saturation or circuit failure.