Feedback Voltage Divider Calculator

Output Voltage Formula:

\[ V_{out} = V_{ref} \times \left(1 + \frac{R_f}{R_g}\right) \]

Output Voltage (V_out): volts

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1. What is a Feedback Voltage Divider Calculator?

Definition: This calculator determines the output voltage of an op-amp circuit with a feedback voltage divider configuration.

Purpose: It helps electronics engineers and hobbyists design and analyze amplifier circuits with precise gain control.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ V_{out} = V_{ref} \times \left(1 + \frac{R_f}{R_g}\right) \]

Where:

\( V_{out} \) — Output voltage (volts)
\( V_{ref} \) — Reference voltage (volts)
\( R_f \) — Feedback resistor (ohms)
\( R_g \) — Gain resistor (ohms)

Explanation: The circuit amplifies the reference voltage by a factor determined by the resistor ratio in the feedback network.

3. Importance of Feedback Voltage Divider

Details: This configuration is fundamental in operational amplifier circuits, providing precise control over gain while maintaining stability.

4. Using the Calculator

Tips: Enter the reference voltage, feedback resistor value (default 10kΩ), and gain resistor value (default 1kΩ). All resistor values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical range for R_f and R_g?
A: Common values range from 1kΩ to 100kΩ, but the ratio is more important than absolute values.

Q2: Can V_ref be zero?
A: Yes, but the output will also be zero. Negative values are possible for inverting configurations.

Q3: What happens if R_g approaches zero?
A: The gain approaches infinity, which is physically impossible - real op-amps have finite gain.

Q4: Does this work for AC signals?
A: Yes, for frequencies within the op-amp's bandwidth. The formula applies to the instantaneous voltages.

Q5: How does this relate to the inverting amplifier?
A: The inverting configuration uses a similar but different formula: V_out = -V_in × (R_f/R_in).